CN114406258B - Thermite reduction reaction powder coated ZTA ceramic particles and preparation method and application thereof - Google Patents

Thermite reduction reaction powder coated ZTA ceramic particles and preparation method and application thereof Download PDF

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CN114406258B
CN114406258B CN202210086109.6A CN202210086109A CN114406258B CN 114406258 B CN114406258 B CN 114406258B CN 202210086109 A CN202210086109 A CN 202210086109A CN 114406258 B CN114406258 B CN 114406258B
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ceramic particles
zta ceramic
reduction reaction
wear
resistant
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CN114406258A (en
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佟伟平
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Huaqingping Wear Resistant Technology Suzhou Co ltd
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Huaqingping Wear Resistant Technology Suzhou Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/22—Lining for containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/28—Details
    • B02C4/30—Shape or construction of rollers
    • B02C4/305—Wear resistant rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
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    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
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    • C22C33/02—Making ferrous alloys by powder metallurgy
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    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
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    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/36—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

Abstract

A ZTA ceramic particle coated by aluminothermic reduction reaction powder, a preparation method and application thereof belong to the field of metal matrix composite materials and wear-resistant materials. The ZTA ceramic particles coated by the thermite reduction reaction powder are of a ZTA ceramic particle/thermite reduction reaction powder core-shell structure, and the metallized ZTA ceramic particles obtained by self-propagating sintering the ZTA ceramic particles coated by the thermite reduction reaction powder are prepared by combining an alloy matrix to prepare a wear-resistant composite material, and the prepared wear-resistant composite material is used as a part of a wear-resistant part and combined with an application part (a roller sleeve of a roller mill, a vertical grinding roller or a lining plate), so that the wear resistance of equipment is improved. By improving the preparation method, an interface with the width of 20-50 mu m can be formed between ZTA ceramic particles and a matrix, and the formation of the interface can remarkably improve the wear resistance of the wear-resistant composite material.

Description

Thermite reduction reaction powder coated ZTA ceramic particles and preparation method and application thereof
Technical Field
The invention relates to a ZTA ceramic particle coated by aluminothermic reduction reaction powder, a preparation method and application thereof, belonging to the technical field of metal matrix composite materials and wear-resistant materials.
Background
Ceramic particle reinforced metal matrix composites, particularly zirconia toughened alumina ceramic (ZTA) particle reinforced iron matrix composites, have excellent physical, chemical and mechanical properties and have found wide application in many wear resistant engineering components in recent years. The primary premise of the ZTA particle reinforced iron-based composite material in practical application is the tight combination between ZTA particles and metal parts. However, poor wettability of the interface is one of the biggest challenges in preparing composites, since the contact angles of Fe/Al 2O3 and Fe/ZrO 2 are as high as 140 ° and 116 °, respectively.
At present, an effective solution is to coat a metal layer on the surface of ZTA ceramic particles to metalize the surface of the ceramic particles so as to improve the adhesion strength of the ceramic surfaces. The metallization of ceramic particle surfaces was achieved in the 70 s of the 20 th century using the molybdenum-manganese method (Mo-Mn), which is closely related to the formation of dense metallic and glassy phases. In order to ensure good migration of the glass phase, the mo—mn metallization process must be sintered in hydrogen at extremely high temperatures above 1500 ℃. The method has high requirements on equipment and production cost for preparing the composite material, and limits the wide application of the method to a great extent. The method for metallizing the surface of ZTA ceramic particles at the present stage mostly adopts modes of surface nickel plating, copper plating and the like, and the process comprises the steps of mechanical treatment, oil removal, coarsening, sensitization, activation, surface nickel plating, copper plating and the like of a matrix, and has more complex process and low process stability coefficient.
Therefore, there is an urgent need to research a method for coating the surface of ZTA ceramic particles with high-activity and high-wettability alloy powder with advantages of simplicity, economy and the like, and a feasible way for realizing the surface metallization of the ceramic particles.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides ZTA ceramic particles coated by aluminothermic reduction reaction powder, and a preparation method and application thereof. The method takes pure aluminum powder and/or aluminum iron powder as an aluminum source, then adds metal oxide capable of carrying out aluminothermic reduction reaction, and sinters the surface of ZTA ceramic particles into a uniformly-wrapped metallized layer by a self-propagating reaction sintering method. The method has the advantages of simple operation, low process difficulty coefficient, good modification of the surface of the ceramic particles and the like. And the metallized ZTA ceramic particles obtained by self-propagating sintering based on ZTA ceramic particles coated by aluminothermic reduction reaction powder are used for preparing the wear-resistant composite material, so that an interface with the width of 20-50 mu m is formed between the ZTA ceramic particles and the matrix, and the formation of the interface can remarkably improve the wear resistance of the wear-resistant composite material.
The invention is realized by adopting the following technical scheme:
The ZTA ceramic particles coated by the thermit reduction reaction powder disclosed by the invention are in a ZTA ceramic particle/thermit reduction reaction powder core-shell structure.
Wherein, according to the mass ratio, the thermit reduction reaction powder: ZTA ceramic particles = 1: (3-10).
The aluminum thermal reduction reaction powder is a mixture of an aluminum source and a metal oxide capable of performing aluminum thermal reduction reaction, wherein the aluminum source is pure aluminum powder and/or aluminum iron powder is an aluminum source; the metal oxide capable of carrying out the thermite reduction reaction is preferably one or more of Fe 2O3、MnO、CuO、Cr2O3;
according to the mass ratio, the aluminum source: metal oxide capable of aluminothermic reduction = 1: (1-4).
The ZTA ceramic particles coated by the thermite reduction reaction powder also contain a binder in the shell, wherein the binder is one or more of sodium silicate, PVA (polyvinyl alcohol), PAM (polyacrylamide) or phenolic resin, and the total amount of the binder is 5-20% of the total mass of the ZTA ceramic particles.
The invention relates to a preparation method of ZTA ceramic particles coated by aluminothermic reduction reaction powder, which comprises the following steps:
(1) Removing impurities from the ZTA ceramic particles, cleaning and drying to obtain dried ZTA ceramic particles;
(2) And weighing the thermit reduction reaction powder according to the proportion, uniformly stirring the thermit reduction reaction powder and the binder, adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermit reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermit reduction reaction powder.
In the step (1), the impurity is removed by soaking in water for 10-24 hours, and the cleaning is ethanol cleaning.
In the step (1), the particle size of the ZTA ceramic particles is 1-5 mm.
In the step (2), the powder granularity of the thermite reduction reaction powder is 60-1000 meshes.
The application of the ZTA ceramic particles coated with the thermit reduction reaction powder is that the metallized ZTA ceramic particles are obtained after the self-propagating sintering of the ZTA ceramic particles coated with the thermit reduction reaction powder.
The self-propagating sintering comprises the following steps:
Step 1: self-propagating sintering
Placing the ZTA ceramic particles coated with the thermit reduction reaction powder in an argon atmosphere protection furnace for self-propagating sintering to obtain a framework material of the ZTA ceramic particles coated with the thermit reduction reaction powder;
Step 2: crushing
And crushing and screening the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
In the step 1, the self-propagating sintering process is as follows: heating to 500-600 ℃ at the speed of 8-10 ℃/min, and preserving heat for 60-90 min; heating to 1000-1350 ℃ at the speed of 4-8.5 ℃/min, preserving heat for 1-10 h, and cooling along with the furnace. Wherein, in the sintering process of heat preservation for 60-90 min at 500-600 ℃, the binder is volatilized in a gas form and is discharged. And heating to 1000-1350 ℃ and preserving heat for 1-10 h to induce self-propagating reaction and perform thermit reduction, so that the metal oxide capable of performing thermit reduction reaction is sintered on the surfaces of ZTA ceramic particles. Since the thermit reduction reaction powder coating the ZTA ceramic particles is very thin and generates little heat, the self-propagating reaction can be carried out under the auxiliary condition of high temperature. At the same time, at the temperature, the excessive oxide in the thermite reduction reaction powder can be sintered with the surfaces of ZTA ceramic particles to form a spinel structure, and the spinel structure and the metal displaced by the thermite reaction are compounded together to form a surface metallization coating.
A wear resistant composite comprising the metallized ZTA ceramic particles described above.
The wear-resistant composite material further comprises an alloy matrix, wherein the metallized ZTA ceramic particles are formed by the following steps of: alloy matrix=1, (1-4).
The alloy matrix is prepared from the following raw materials in percentage by mass: 1.0 to 6 percent of C, 0 to 20 percent of Cr, 0 to 20 percent of V, 10 to 40 percent of Mn, 0 to 60 percent of Mo, 0 to 30 percent of Ni, 0 to 20 percent of Ti, 0 to 30 percent of W, less than or equal to 0.02 percent of P, less than or equal to 0.01 percent of S, and the balance of iron and unavoidable impurities. Wherein the alloy matrix contains at least 2 wear-resistant alloy elements (Cr, V, mn, mo, ni, ti, W).
The wear-resistant composite material can be applied to the surface of wear-resistant equipment, wherein the wear-resistant equipment is one of a high-pressure roller mill, a vertical mill and a lining plate;
The wear-resistant composite material and the surface of the wear-resistant equipment are fixed in a bolt connection mode, wherein the adopted bolt surface is provided with the 2-3 cm wear-resistant composite material, so that the overall wear resistance of the wear-resistant equipment is not affected.
The application method of the wear-resistant composite material comprises the following steps:
step one: mixing the metallized ZTA ceramic particles and alloy powder of an alloy matrix uniformly according to a proportion to obtain a mixed material; wherein, according to the volume ratio, the metallized ZTA ceramic particles: alloy powder of alloy matrix = 1, (1-4);
step two: placing the mixed material into a region of the steel-based ductile member to be wear-resistant to obtain an overall material;
step three: and (5) putting the whole material into an argon atmosphere protection furnace for sintering to form the wear-resistant part.
In the first step, the mixing time is preferably 3-10 h.
In the second step, the area of the steel-based ductile member, which needs to resist abrasion, is a designated steel-based ductile member groove and is used for preparing the upper surface of the locking screw; wherein the steel-based ductile member is low carbon steel or low alloy steel, and the toughness thereof is 15-100J/cm 2, and particularly preferably one of Q235 steel, 20Cr steel, 40CrMo steel, 42CrMoV steel, 40 steel or 45 steel.
In the second step, the shape of the steel-based ductile member may be designed according to the application member to be formulated. Wherein, the fixed position of each wear-resistant part is a cylinder reserved for the original tough groove base.
In the third step, the sintering process in the argon atmosphere protection furnace is as follows: heating to 800-850 ℃ at the speed of 4-9 ℃/min, and preserving heat for 1-3 h; heating to 1200-1600 ℃ at the speed of 4-8 ℃/min, preserving heat for 4-10 h, and cooling along with the furnace.
The wear-resistant part mainly comprises a sintered body with a wear-resistant material filled in a tough groove matrix; and surface wear-resistant locking screws for fixing the integral sintered body to the surface of the high-pressure roller or the vertical mill.
The wear-resistant part is applied to the following steps:
Step I: the surface of the wear-resistant part and the surface of the application part are processed; the application part is one of a roller sleeve of a roller mill, a vertical mill roller or a lining plate;
Step II: the wear resistant component is secured to the surface of the application component to provide a wear resistant application component.
The ZTA ceramic particles coated by the thermite reduction reaction powder and the preparation method and the application thereof have the following characteristics compared with the prior art:
(1) The method of the invention is to coat the thermit reduction reaction powder on the surface of ZTA ceramic particles, and to carry out self-propagating reaction at a certain temperature, so as to metalize the surface of the ceramic particles and enhance the metallurgical interface combination between the metal liquid and the matrix.
(2) The exothermic amount of the ZrO 2-Fe2O3-MnO-CuO-Cr2O3 -Al system at a certain temperature meets the condition that the coating layer on the surface of the ZTA ceramic particle has self-propagating reaction; thermodynamic equilibrium calculation shows that the system reaction product mainly consists of solid solution of Al 2O3 and Zr-Al-Mn-Cu-Cr-Fe.
The elements present in the transition layer of the ZTA ceramic particles and the matrix as shown in fig. 1, 2 are Al elements and Zr elements from the ZTA ceramic particles, and Cr, mn, fe elements and a small amount of Ti elements from the self-propagating powder reaction and the matrix material. Further verifies the feasibility of the self-propagating reaction of the aluminothermic reduction reaction powder and ZrO 2 in ZTA and coating the surface of ZTA ceramic particles with a metallization layer.
(3) The invention has simple operation and avoids more complicated procedures.
(4) The wear-resistant block is prepared into a wear-resistant piece in a bolt fixing mode. The surface of the bolt adopts a mode of compounding the wear-resistant blocks, so that the increase of the abrasion loss caused by insufficient local abrasion-resistant conditions is avoided.
Drawings
FIG. 1 is an SEM image of the interface of a wear part of example 1;
FIG. 2 is an EDS spectroscopy analysis at the wear part interface obtained in example 1;
FIG. 3 is a steel-based ductile member groove;
FIG. 4 is a steel bar and groove of a cylindrical locking screw;
FIG. 5 is a schematic cross-sectional installation of a wear part on the surface of a vertical mill roll;
FIG. 6 is an assembled view (cross-sectional view) of a vertical mill roll;
FIG. 7 is a schematic cross-sectional installation of a wear part of the liner surface;
FIG. 8 is an assembled view (cross-sectional view) of the liner panel surface;
FIG. 9 is a schematic view of the installation of wear components on the surface of a high pressure roller mill;
FIG. 10 is a process flow diagram of a method of making wear resistant application components;
In the above figures, 1 is a steel bar for locking a cylindrical fastening screw, 2 is a groove for locking the cylindrical fastening screw, 3 is a vertical grinding roller, 4 is a wear-resistant part, 5 is a lining plate, and 6 is a roller sleeve of a high-pressure roller mill.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto.
In the following examples, a schematic process flow diagram of a method of making wear resistant application components is shown in FIG. 10.
Example 1
A preparation method of a wear-resistant vertical grinding roller comprises the following steps:
step1, alloying the surfaces of ZTA ceramic particles:
(1) And (3) soaking the ZTA ceramic particles with the average particle size of 2mm in water for 10 hours, then putting the ZTA ceramic particles into ethanol, cleaning for 3 times, and drying to obtain the dried ZTA ceramic particles.
(2) The aluminum thermal reduction reaction powder comprises the following components in percentage by mass: the method comprises the steps of weighing ZTA ceramic particles and aluminothermic reduction reaction powder, mixing the weighed aluminothermic reduction reaction powder with a binder (mixture of water glass and polyvinyl alcohol according to mass ratio, water glass and polyvinyl alcohol=1:1), stirring (wherein the mass of the binder is 5% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the aluminothermic reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the aluminothermic reduction reaction powder;
Wherein the thermit reduction reaction powder is a mixture of pure aluminum (the mass percent purity is 99.8%) and Fe 2O3、MnO、Cr2O3, and the mass ratio of the pure aluminum is as follows: fe 2O3：MnO：Cr2O3 = 3:1:1:1, a step of; wherein the thermite reduction reaction powder is 100 mesh undersize.
(3) Putting the ZTA ceramic particles coated by the aluminothermic reduction reaction powder into an argon atmosphere protection furnace for self-propagating sintering, heating to 500 ℃ at the speed of 8 ℃/min, and preserving heat for 60min; heating to 1000 ℃ at the speed of 4 ℃/min, preserving heat for 3 hours, and cooling along with the furnace. Further obtaining a framework material of ZTA ceramic particles coated by the thermite reduction reaction powder;
in the process, zrO 2+Fe2O3+MnO+Cr2O3 + pure aluminum in the ZTA ceramic particles coated by the thermite reduction reaction powder undergoes a self-propagating reaction to form a Zr-Al-Mn-Cr-Fe solid solution metallized layer coated on the surfaces of the ZTA particles.
(4) And crushing and screening the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles with the average particle size of 2+/-0.2 mm.
Step 2, preparation of wear-resistant parts:
The wear-resistant part comprises a region of the steel-based ductile member to be wear-resistant and a wear-resistant composite material disposed on the region of the steel-based ductile member to be wear-resistant; wherein the wear-resistant composite material comprises metallized ZTA ceramic particles and a metal matrix;
(1) The method comprises the steps of firstly preparing an alloy matrix in the wear-resistant composite material, wherein alloy powder of the alloy matrix contains the following components in percentage by mass: c:6%, mn 10.0%, cr 2%, ti:20%, W:10%, 0.02% P, 0.01% S, and the balance of iron and unavoidable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and according to the volume ratio, metallizing the ZTA ceramic particles: after alloy matrix=1:4 was prepared, the mixture was put into a powder mixer and mixed for 3 hours, and the mixed material was put into a groove of a 20 steel-based ductile member (as shown in fig. 3) and a groove 2 of a cylindrical locking screw in the upper surface of a steel rod 1 of the cylindrical locking screw (as shown in fig. 4), to obtain an overall material.
(3) The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 800 ℃ at the speed of 4 ℃/min, and the heat is preserved for 1h; heating to 1200 ℃ at a speed of 5 ℃/min, preserving heat for 5 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, interfaces of 20-30 μm width are formed between the ZTA ceramic particles and the matrix (see fig. 1), achieving an effective metallurgical interface bond.
The EDS spectrum at the interface was analyzed, and the result is shown in fig. 2, and the analysis in fig. 2 shows that the elements existing in the transition layer of the ZTA ceramic particles and the matrix are the Al element and the Zr element from the ZTA ceramic particles, and the Cr, mn, fe element and a small amount of Ti element from the self-propagating powder reaction and the matrix material.
Step 3, preparing a vertical grinding roller:
(1) The cylinder reserved in the integral sintering body and the wear-resistant part (a locking screw cylinder for fixing) are treated, and the cylinder and the wear-resistant part are processed by using matched screw sizes;
(2) The wear resistant component 4 is fixed to the surface of the vertical mill roll 3 (as shown in figures 5 and 6) for the desired application.
Example 2
A preparation method of a wear-resistant roller sleeve of a high-pressure roller mill comprises the following steps:
step1, alloying the surfaces of ZTA ceramic particles:
(1) The ceramic particles are cleaned, firstly, ZTA ceramic particles with the average particle size of 3mm are put into water to be soaked for 24 hours, then are put into ethanol to be cleaned for 4 times, and then are dried, so that the dried ZTA ceramic particles are obtained.
(2) The aluminum thermal reduction reaction powder comprises the following components in percentage by mass: the method comprises the steps of weighing the thermite reduction reaction powder and the ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (mixture of water glass, PAM and phenolic resin according to mass ratio, wherein the total mass of the binder is 15% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Wherein the aluminothermic reduction reaction powder is a mixture of aluminum iron powder (aluminum is 50% by mass and the balance is iron) and MnO and CuO, and the aluminum iron powder is prepared by the following steps of: mnO: cuo=1: 1:2; wherein the thermite reduction reaction powder is 100 mesh undersize.
(3) Putting the ZTA ceramic particles coated by the aluminothermic reduction reaction powder into an argon atmosphere protection furnace for self-propagating sintering, heating to 600 ℃ at the speed of 10 ℃/min, and preserving heat for 90min; heating to 1350 ℃ at the speed of 8 ℃/min, preserving heat for 10 hours, and cooling along with the furnace. And then the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder is obtained.
(4) And crushing and screening the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles with the average particle size of 3+/-0.2 mm.
Step 2, preparation of wear-resistant parts:
The wear-resistant part comprises a region of the steel-based ductile member to be wear-resistant and a wear-resistant composite material disposed on the region of the steel-based ductile member to be wear-resistant; wherein the wear-resistant composite material comprises metallized ZTA ceramic particles and a metal matrix;
(1) The method comprises the steps of firstly preparing an alloy matrix in the wear-resistant composite material, wherein alloy powder of the alloy matrix contains the following components in percentage by mass: c:1.0%, mn:20%, cr 4%, mo:20%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
(2) And weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, preparing the alloy powder according to the volume ratio of 1:1, putting the alloy powder into a powder mixer, mixing for 10 hours, and putting the mixed material into a groove of a Q235 steel-based ductile member and a groove on the upper surface of a cylindrical Q235 steel rod for manufacturing a locking screw to obtain the integral material.
(3) The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 850 ℃ at the speed of 6 ℃/min, and the heat is preserved for 3 hours; heating to 1600 ℃ at the speed of 8 ℃/min, preserving heat for 10 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, interfaces with a width of 30 μm are formed between the ZTA ceramic particles and the matrix, achieving an effective metallurgical interface bond.
Step 3, preparing a roller sleeve of a high-pressure roller mill:
(1) The cylinder reserved in the integral sintering body and the wear-resistant part (a locking screw cylinder for fixing) are treated, and the cylinder and the wear-resistant part are processed by using matched screw sizes;
(2) The wear part 4 is fixed to the surface of the high-pressure roller sleeve 6 (fig. 9) for the desired application.
Example 3
A preparation method of a wear-resistant lining plate comprises the following steps:
step1, alloying the surfaces of ZTA ceramic particles:
(1) And (3) cleaning ceramic particles, namely putting the ZTA ceramic particles with the average particle size of 2mm into water to be soaked for 12 hours, putting the ZTA ceramic particles into ethanol to be cleaned for 3 times, and drying the dried ZTA ceramic particles to obtain the ZTA ceramic particles.
(2) The aluminum thermal reduction reaction powder comprises the following components in percentage by mass: the method comprises the steps of weighing the thermite reduction reaction powder and the ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (mixture of water glass, PVA and phenolic resin according to mass ratio, wherein the total mass of the binder is 8% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Wherein the thermit reduction reaction powder is a mixture of pure aluminum (the mass percent purity is more than 99.9%) and Fe 2O3, and the pure aluminum is prepared by the following mass ratio: fe 2O3 = 1:2; wherein the thermite reduction reaction powder is 100 mesh undersize.
Wherein, through analysis, the ZTA ceramic particles coated by the thermite reduction reaction powder are core-shell structures with the ZTA ceramic particles as cores and the thermite reduction reaction powder as shells.
(3) Putting the ZTA ceramic particles coated by the thermit reduction reaction powder into an argon atmosphere protection furnace for self-propagating sintering, heating to 520 ℃ at the speed of 9 ℃/min, and preserving heat for 70min; heating to 1220 ℃ at a speed of 5 ℃/min, preserving heat for 5 hours, and cooling along with the furnace. And then the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder is obtained.
(4) And crushing the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
Step 2, preparation of wear-resistant parts:
The wear-resistant part comprises a region of the steel-based ductile member to be wear-resistant and a wear-resistant composite material disposed on the region of the steel-based ductile member to be wear-resistant; wherein the wear-resistant composite material comprises metallized ZTA ceramic particles and a metal matrix;
(1) Preparing an alloy matrix in the wear-resistant composite material, wherein the alloy powder of the alloy matrix comprises the following components in percentage by mass: c:3%, mn 15%, cr 6%, V:20%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and mixing the alloy powder with the metallized ZTA ceramic particles according to the volume ratio: after alloy matrix=1:2 was prepared, it was put into a powder mixer and mixed for 5 hours, and the mixed material was put into a groove of a 20Cr steel-based ductile member and a groove of a cylindrical locking screw in the upper surface of a cylindrical 20Cr rod for locking screws, to obtain an overall material.
(3) The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 820 ℃ at the speed of 5 ℃/min, and the heat is preserved for 2 hours; heating to 1380 ℃ at the speed of 6 ℃/min, preserving heat for 6 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, interfaces of 28 μm width are formed between the ZTA ceramic particles and the matrix, and an effective metallurgical interface bond is achieved.
Step 3, preparation of a lining plate:
(1) The cylinder reserved in the integral sintering body and the wear-resistant part (a locking screw cylinder for fixing) are treated, and the cylinder and the wear-resistant part are processed by using matched screw sizes;
(2) The wear part 4 is fixed to the surface of the backing plate 5 (as shown in figures 7, 8) for the desired application.
Example 4
A preparation method of a wear-resistant vertical grinding roller comprises the following steps:
step1, alloying the surfaces of ZTA ceramic particles:
(1) And (3) soaking the ZTA ceramic particles in water for 16 hours, then putting the ZTA ceramic particles in ethanol, cleaning for 4 times, and drying to obtain the dried ZTA ceramic particles.
(2) The aluminum thermal reduction reaction powder comprises the following components in percentage by mass: the method comprises the steps of weighing the thermite reduction reaction powder and the ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (a mixture of PVA and phenolic resin, PVA: phenolic resin=1:1) according to a mass ratio, wherein the total mass of the binder is 10% of the total mass of the ZTA ceramic particles, adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Wherein the thermit reduction reaction powder is a mixture of pure aluminum (the mass percent purity is more than 99.9 percent), fe 2O3 and CuO, and the pure aluminum is prepared by the following mass ratio: cuO: fe 2O3 = 2:1:2; wherein the thermite reduction reaction powder is 100 mesh undersize.
(3) Putting the ZTA ceramic particles coated by the aluminothermic reduction reaction powder into an argon atmosphere protection furnace for self-propagating sintering, heating to 540 ℃ at the speed of 8.5 ℃/min, and preserving heat for 80min; raising the temperature to 1300 ℃ at the speed of 5.5 ℃/min, preserving the heat for 4 hours and then cooling along with the furnace. And then the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder is obtained.
(4) And crushing and screening the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
Step 2, preparation of wear-resistant parts:
The wear-resistant part comprises a region of the steel-based ductile member to be wear-resistant and a wear-resistant composite material disposed on the region of the steel-based ductile member to be wear-resistant; wherein the wear-resistant composite material comprises metallized ZTA ceramic particles and a metal matrix;
(1) Preparing an alloy matrix in the wear-resistant composite material, wherein the alloy powder of the alloy matrix comprises the following components in percentage by mass: c:3.8%, cr 1%, mo:60% Mn 10%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and mixing the alloy powder with the metallized ZTA ceramic particles according to the volume ratio: after alloy matrix=1:3 was prepared, the mixture was put into a powder mixer and mixed for 7 hours, and the mixed material was put into a groove of a 40Cr steel-based ductile member and a groove of a cylindrical locking screw in the upper surface of a cylindrical 40Cr steel rod for locking screws, to obtain an overall material.
(3) Sintering the whole material in an argon atmosphere protection furnace, heating to 800 ℃ at the speed of 9 ℃/min, and preserving heat for 60min; heating to 1320 ℃ at a speed of 4 ℃/min, preserving heat for 4 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, an interface with a width of 21 μm is formed between the ZTA ceramic particles and the matrix, and an effective metallurgical interface bond is achieved.
Step 3, preparing a vertical grinding roller:
(1) Processing a reserved cylinder in the integral sintering body and a locking screw cylinder for fixing, and processing the cylinder by using matched screw sizes;
(2) The wear resistant components are secured to the surface of the vertical mill roll for the desired application.
Example 5
A preparation method of a vertical grinding roller with high wear resistance is the same as in example 1, except that:
in step 1:
The mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is that: ZTA ceramic particles=1:5, stirring the thermite reduction reaction powder and a binder (water glass and phenolic resin, wherein the mass ratio of the water glass to the phenolic resin is 1:1) (the total mass of the binder is 8% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain ZTA ceramic particles coated with the thermite reduction reaction powder;
Self-propagating sintering, heating to 580 ℃ at the speed of 9.5 ℃/min, and preserving heat for 70min; heating to 1300 ℃ at the speed of 4.5 ℃/min, preserving heat for 4 hours, and cooling along with a furnace to obtain the framework material of the ZTA ceramic particles coated by the thermit reduction reaction powder. And crushing and screening the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
In step 2: the alloy matrix in the wear-resistant composite material comprises the following components in percentage by mass: c:2.5%, mn:18%, ni 1%, W:30%, 0.02% of P, 0.01% of S, and the balance of iron and unavoidable impurities.
The volume ratio of the metallized ZTA ceramic particles to the alloy powder of the alloy matrix is as follows: after alloy matrix=1:2 was prepared, it was placed into a powder mixer and mixed for 3 hours, and the mixed material was placed into a groove of a 40CrMo steel-based ductile member and a groove of a cylindrical locking screw in the upper surface of a cylindrical 40CrMo steel bar for locking screws.
Sintering the whole material, heating to 800 ℃ at the speed of 8.5 ℃/min, and preserving heat for 65min; heating to 1350 ℃ at the speed of 6 ℃/min, preserving heat for 6 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, an interface of 27 μm width is formed between the ZTA ceramic particles and the matrix, achieving an effective metallurgical interface bond.
The rest of the procedure is the same as in example 1.
Example 6
A preparation method of a high-wear-resistance roller sleeve of a high-pressure roller mill is the same as that in the embodiment 2, and is different in that:
In the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is that: the method comprises the steps of (1) mixing the thermite reduction reaction powder with a binder (mixture of water glass and PAM, according to mass ratio, water glass: PAM=1:1) (wherein the total mass of the binder is 10% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Self-propagating sintering, heating to 600 ℃ at the speed of 9.5 ℃/min, and preserving heat for 65min; heating to 1310 ℃ at the speed of 4.5 ℃/min, preserving heat for 5.5h, and cooling along with a furnace to obtain the framework material of the ZTA ceramic particles coated by the thermit reduction reaction powder. And crushing and screening the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
In the step 2, the alloy matrix in the wear-resistant composite material comprises the following components in percentage by mass: c:2%, cr 20%, mn:17%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
The metallized ZTA ceramic particles and alloy powder of an alloy matrix are prepared into metallized ZTA ceramic particles according to the volume ratio: after alloy matrix=1:3 was formulated, it was placed into a powder mixer for 5.5 hours, and the mixed material was placed into grooves in a 42CrMoV steel-based ductile member and grooves in the upper surface of a cylindrical 42CrMoV steel bar for locking screws.
The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 850 ℃ at the speed of 6 ℃/min, and the heat is preserved for 3 hours; heating to 1450 ℃ at the speed of 8 ℃/min, preserving heat for 10 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, an interface of 25 μm width is formed between the ZTA ceramic particles and the matrix, achieving an effective metallurgical interface bond.
The rest of the procedure is the same as in example 2.
Example 7
A preparation method of a high wear-resistant lining plate is the same as in the embodiment 3, and the difference is that:
In the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is that: the preparation method comprises the steps of (1) mixing the thermite reduction reaction powder with a binder (a mixture of PVA, PAM and phenol resin according to mass ratio, wherein the total mass of the binder is 10% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Wherein the thermit reduction reaction powder is a mixture of pure aluminum (the mass percent purity is more than 99.8%) and Fe 2O3, and the pure aluminum is prepared by the following mass ratio: fe 2O3 = 1:2; wherein the thermite reduction reaction powder is 200 mesh undersize.
Self-propagating sintering, heating to 550 ℃ at the speed of 9.5 ℃/min, and preserving heat for 75min; heating to 1310 ℃ at the speed of 4.5 ℃/min, preserving heat for 5.5h, and cooling along with a furnace to obtain the framework material of the ZTA ceramic particles coated by the thermit reduction reaction powder. And crushing and sieving the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder to obtain the homogenized metallized ZTA ceramic particles.
In step2, preparing an alloy matrix in the wear-resistant composite material, wherein the alloy powder of the alloy matrix contains the following components in percentage by mass: c:3.8%, ni 30%, ti:1%, mn:20%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
The metallized ZTA ceramic particles and alloy powder of an alloy matrix are prepared by the following steps of: after alloy matrix=1:2.5 was formulated, it was placed into a powder mixer and mixed for 6 hours, and the mixed material was placed into grooves in a 40 steel-based ductile member and grooves in the upper surface of a cylindrical 40 steel bar for locking screws.
The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 820 ℃ at the speed of 5 ℃/min, and the heat is preserved for 2.5 hours; heating to 1400 ℃ at the speed of 6.5 ℃/min, preserving heat for 7.5 hours, and cooling along with the furnace to obtain the wear-resistant part. In the wear-resistant component, interfaces with a width of 30 μm are formed between the ZTA ceramic particles and the matrix, achieving an effective metallurgical interface bond.
The rest of the procedure is the same as in example 3.
Example 8
A preparation method of a high-wear-resistance vertical grinding roller is the same as in example 4, except that:
In the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is that: the preparation method comprises the steps of (1) mixing the thermite reduction reaction powder with a binder (sodium silicate, PVA, PAM and phenol formaldehyde resin according to the mass ratio of sodium silicate to PVA to PAM to phenol formaldehyde resin=2:1:1:1) (wherein the total mass of the binder is 15% of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermite reduction reaction powder;
Wherein the thermit reduction reaction powder is a mixture of pure aluminum (the mass percent purity is more than 99.9%) and Fe 2O3, and the pure aluminum is prepared by the following mass ratio: fe 2O3 = 1:4, a step of; wherein the thermite reduction reaction powder is 500 mesh undersize.
Self-propagating sintering, heating to 560 ℃ at the speed of 8 ℃/min, and preserving heat for 80min; heating to 1325 ℃ at the speed of 5 ℃/min, preserving heat for 6 hours, and cooling along with a furnace to obtain the framework material of the ZTA ceramic particles coated by the thermit reduction reaction powder. And crushing the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder, and sieving to obtain the homogenized metalized ZTA ceramic particles.
In step 2, preparing an alloy matrix in the wear-resistant composite material, wherein the alloy powder of the alloy matrix contains the following components in percentage by mass: c:4%, cr 1%, W:4%, mn:40%, P0.02%, S0.01%, the balance being iron and unavoidable impurities.
Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and mixing the alloy powder with the metallized ZTA ceramic particles according to the volume ratio: after alloy matrix=1:2.5 was formulated, it was placed into a powder mixer and mixed for 6 hours, and the mixed material was placed into grooves in a 45 steel-based ductile member and grooves in the upper surface of a cylindrical 45 steel bar for locking screws.
The whole material is put into an argon atmosphere protection furnace for sintering, the temperature is raised to 800 ℃ at the speed of 5.5 ℃/min, and the heat is preserved for 3 hours; heating to 1420 ℃ at a speed of 7 ℃/min, preserving heat for 8 hours, and cooling along with a furnace to obtain the wear-resistant part. In the wear-resistant component, an interface with a width of 45 μm is formed between the ZTA ceramic particles and the matrix, and an effective metallurgical interface bond is achieved.
The rest of the procedure is the same as in example 4.
Comparative example 1
A method for preparing a vertical grinding roller, which is similar to example 1, and is different in that:
The adopted ZTA ceramic particles coated by the thermit reduction reaction powder only contain pure aluminum (the mass percent purity is more than 99.9 percent), and does not contain oxides such as Fe 2O3、MnO、CuO、Cr2O3 and the like which are easy to generate self-propagating reaction.
Putting the ZTA ceramic particles coated by the thermit reduction reaction powder into an argon atmosphere protection furnace, heating to 500 ℃ at the speed of 8 ℃/min, and preserving heat for 60min; then heating to 1000 ℃ at the speed of 4 ℃/min, preserving heat for 3 hours, and cooling along with the furnace.
Observation shows that as the adsorption effect of other difficultly-contained oxide powder is not generated, one part of aluminum powder flows to the bottom of the crucible after melting, and the other part of aluminum powder is adsorbed on the surfaces of ZTA particles to form a coating layer. The coating layer does not have self-propagating reaction with ZrO 2 in ZTA particles, is only physical adsorption, and cannot form a metallurgically bonded metallized layer on the surfaces of the ZTA particles.

Claims (6)

1. A preparation method of metallized ZTA ceramic particles is characterized in that the metallized ZTA ceramic particles are obtained after the ZTA ceramic particles coated by aluminothermic reduction reaction powder are subjected to self-propagating sintering; the self-propagating sintering comprises the following steps:
Step 1: self-propagating sintering
Placing the ZTA ceramic particles coated with the thermit reduction reaction powder in an argon atmosphere protection furnace for self-propagating sintering to obtain a framework material of the ZTA ceramic particles coated with the thermit reduction reaction powder;
Step 2: crushing
Crushing and screening framework materials of ZTA ceramic particles coated by aluminothermic reduction reaction powder to obtain metallized ZTA ceramic particles;
the ZTA ceramic particles coated by the thermite reduction reaction powder are in a ZTA ceramic particle/thermite reduction reaction powder core-shell structure; according to the mass ratio, the thermit reduction reaction powder: ZTA ceramic particles = 1: (3-10);
The aluminum thermal reduction reaction powder is a mixture of an aluminum source and metal oxide capable of carrying out aluminum thermal reduction reaction, and the aluminum source is prepared by the following components in percentage by mass: metal oxide capable of aluminothermic reduction = 1: (1-4); wherein the aluminum source is aluminum iron powder; the metal oxide capable of carrying out the thermit reduction reaction is one or more of Fe 2O3、CuO、Cr2O3;
In the step 1, the self-propagating sintering process is as follows: heating to 500-600 ℃ at the speed of 8-10 ℃/min, and preserving heat for 60-90 min; heating to 1000-1350 ℃ at the speed of 4-8.5 ℃/min, preserving heat for 1-10 h, and cooling with a furnace.
2. The preparation method of the metallized ZTA ceramic particles according to claim 1, wherein the ZTA ceramic particles coated by the aluminothermic reduction reaction powder further comprise a binder in a shell, the binder is one or more of sodium silicate, polyvinyl alcohol, polyacrylamide or phenolic resin, and the total amount of the binder is 5% -20% of the total mass of the ZTA ceramic particles.
3. The method for preparing metallized ZTA ceramic particles according to any one of claims 1-2, wherein the method for preparing the ZTA ceramic particles coated with the thermite reduction reaction powder comprises the following steps:
(1) Removing impurities from the ZTA ceramic particles, cleaning and drying to obtain dried ZTA ceramic particles;
(2) And weighing the thermit reduction reaction powder according to the proportion, uniformly stirring the thermit reduction reaction powder and the binder, adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermit reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated by the thermit reduction reaction powder.
4. A wear resistant composite comprising the metallized ZTA ceramic particles of claim 1, further comprising an alloy matrix, the metallized ZTA ceramic particles in a volume ratio of: alloy matrix=1, (1-4);
The alloy matrix is prepared from the following raw materials in percentage by mass: 1.0-6% of C, 0-20% of Cr, 0-20% of V, 10-40% of Mn, 0-60% of Mo, 0-30% of Ni, 0-20% of Ti, 0-30% of W, less than or equal to 0.02% of P, less than or equal to 0.01% of S, and the balance of iron and unavoidable impurities; wherein at least 2 of the wear resistant alloying elements Cr, V, mn, mo, ni, ti, W are contained in the alloy matrix.
5. A method of using the abrasion resistant composite material of claim 4, comprising the steps of:
step one: mixing the metallized ZTA ceramic particles and alloy powder of an alloy matrix uniformly according to a proportion to obtain a mixed material; wherein, according to the volume ratio, the metallized ZTA ceramic particles: alloy powder of alloy matrix = 1, (1-4);
step two: placing the mixed material into a region of the steel-based ductile member to be wear-resistant to obtain an overall material;
Step three: the whole material is put into an argon atmosphere protection furnace to be sintered, so that a wear-resistant part is formed; wherein, the sintering process in the argon atmosphere protection furnace is as follows: heating to 800-850 ℃ at the speed of 4-9 ℃/min, and preserving heat for 1-3 h; heating to 1200-1600 ℃ at the speed of 4-8 ℃/min, preserving heat for 4-10 hours, and cooling with a furnace;
The wear-resistant part mainly comprises a sintered body with a wear-resistant material filled in a tough groove matrix; and surface wear-resistant locking screws for fixing the integral sintered body to the surface of the high-pressure roller or the vertical mill;
in the wear-resistant component, an interface with the width of 20-50 μm is formed between the ZTA ceramic particles and the alloy matrix.
6. A method of using the abrasion resistant composite material of claim 5, wherein the abrasion resistant member is prepared by:
Step I: the surface of the wear-resistant part and the surface of the application part are processed; the application part is one of a roller sleeve of a roller mill, a vertical mill roller or a lining plate;
Step II: the wear resistant component is secured to the surface of the application component to provide a wear resistant application component.
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