CN114406258A - 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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CN114406258A
CN114406258A CN202210086109.6A CN202210086109A CN114406258A CN 114406258 A CN114406258 A CN 114406258A CN 202210086109 A CN202210086109 A CN 202210086109A CN 114406258 A CN114406258 A CN 114406258A
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ceramic particles
zta ceramic
reduction reaction
wear
powder
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CN114406258B (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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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00Disintegrating 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
    • B02C17/18Details
    • B02C17/22Lining for containers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00Crushing or disintegrating by roller mills
    • B02C4/28Details
    • B02C4/30Shape or construction of rollers
    • B02C4/305Wear resistant rollers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00Manufacture 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
    • B22F7/06Manufacture 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
    • B22F7/08Manufacture 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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    • C22C38/58Ferrous 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 thermite reduction reaction powder, a preparation method and application thereof, belonging to the field of metal matrix composite materials and wear-resistant materials. The ZTA ceramic particles coated with the thermite reduction reaction powder are ZTA ceramic particles/thermite reduction reaction powder core-shell structures, metallized ZTA ceramic particles obtained by self-propagating sintering of the ZTA ceramic particles coated with the thermite reduction reaction powder are prepared from a wear-resistant composite material in a combined alloy matrix, the prepared wear-resistant composite material is used as a part of a wear-resistant part and is combined with an application part (a roller sleeve of a roller mill, a vertical grinding roller or a lining plate), and 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 the ZTA ceramic particles and the matrix, and the formation of the interface can obviously 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 with thermite reduction reaction powder and a preparation method and application thereof, belonging to the technical field of metal matrix composite materials and wear-resistant materials.
Background
The ceramic particle reinforced metal matrix composite material, especially the zirconium oxide toughened alumina ceramic (ZTA) particle reinforced iron matrix composite material has excellent physical, chemical and mechanical propertiesHas been widely used in many wear resistant engineering components for years. The first prerequisite for practical application of ZTA particle reinforced iron-based composites is the intimate bond between the ZTA particles and the metal parts. However, due to Fe/Al2O3And Fe/ZrO2The contact angles of the composite material are respectively as high as 140 degrees and 116 degrees, and the poor wettability of the interface becomes one of the biggest problems in preparing the composite material.
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 surface. The molybdenum-manganese process (Mo-Mn) was used in the 70's of the 20 th century to achieve metallization of the surface of ceramic particles, which is closely related to the formation of dense metal and glass phases. In order to ensure good migration of the glass phase, the Mo — Mn metallization process has to be sintered in hydrogen at very high temperatures above 1500 ℃. The method has high requirements on equipment and production cost for preparing the composite material, and the wide application of the method is limited to a great extent. At present, the surface metallization method of ZTA ceramic particles mostly adopts the modes of surface nickel plating, copper plating and the like, the process comprises the steps of matrix mechanical treatment, oil removal, coarsening, sensitization, activation, surface nickel plating, copper plating and the like, the process is more complex, and the process stability coefficient is low.
Therefore, a method for coating the surface of the ZTA ceramic particle with high-activity and high-wettability alloy powder with the advantages of simplicity, economy and the like is urgently needed to be researched, and a feasible way for realizing the surface metallization of the ceramic particle is realized.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides ZTA ceramic particles coated with thermite 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 mixture into a uniformly wrapped metallization layer on the surface of ZTA ceramic particles by a self-propagating reaction sintering method. The method has the advantages of simple operation, low process difficulty coefficient, better modification of the surface of the ceramic particles and the like. And preparing the wear-resistant composite material from metallized ZTA ceramic particles obtained by self-propagating sintering of ZTA ceramic particles coated with aluminothermic reduction reaction powder, 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 obviously 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 with the thermite reduction reaction powder have a ZTA ceramic particle/thermite reduction reaction powder core-shell structure.
Wherein, according to the mass ratio, the aluminothermic reduction reaction powder: ZTA ceramic particles ═ 1: (3-10).
The aluminothermic reduction reaction powder is a mixture of an aluminum source and a metal oxide capable of carrying out aluminothermic reduction reaction, wherein the aluminum source is pure aluminum powder and/or aluminum iron powder is the aluminum source; the metal oxide capable of thermite reduction is preferably Fe2O3、MnO、CuO、Cr2O3One or more of the above;
according to the mass ratio, the aluminum source: metal oxide capable of thermite reduction reaction ═ 1: (1-4).
In the ZTA ceramic particles coated with the thermite reduction reaction powder, a binder is also contained in the shell, the binder is one or more of water glass (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 thermite reduction reaction powder, which comprises the following steps:
(1) removing impurities from ZTA ceramic particles, cleaning, and drying to obtain dried ZTA ceramic particles;
(2) weighing thermite reduction reaction powder according to a ratio, uniformly stirring the thermite reduction reaction powder and a binder, adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surface of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermite reduction reaction powder.
In the step (1), the impurity removal is carried out by soaking in water for 10-24 h, and the cleaning is carried out by ethanol.
In the step (1), the particle size of ZTA ceramic particles is 1-5 mm.
In the step (2), the particle size of the thermite reduction reaction powder is 60-1000 meshes.
The invention relates to application of a ZTA ceramic particle coated with thermite reduction reaction powder, which is to obtain a metallized ZTA ceramic particle after the ZTA ceramic particle coated with thermite reduction reaction powder is 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 thermite reduction reaction powder in an argon atmosphere protective furnace for self-propagating sintering to obtain a framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder;
step 2: crushing
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 1, the self-propagating sintering process comprises the following steps: heating to 500-600 ℃ at the speed of 8-10 ℃/min, and keeping the temperature 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 with the temperature of 500-600 ℃ kept for 60-90 min, the binder is volatilized in a gas form, and the gas is discharged. And raising the temperature to 1000-1350 ℃, and preserving the temperature for 1-10 hours, so as to induce a self-propagating reaction and carry out thermite reduction, so that the metal oxide capable of carrying out the thermite reduction reaction is sintered on the surfaces of ZTA ceramic particles. Since the thermite reduction reaction powder coating the ZTA ceramic particles is very thin and generates little heat, the self-propagating reaction must be carried out under the high temperature auxiliary condition. At the same time, at the temperature, the excessive oxide in the thermite reduction reaction powder can generate sintering reaction with the surfaces of ZTA ceramic particles to form a spinel structure, and the spinel structure is compounded with metal replaced by the thermite reaction to form a surface metallization coating layer.
A wear resistant composite comprising the metallized ZTA ceramic particles described above.
A wear-resistant composite further comprising an alloy matrix of metallized ZTA ceramic particles in volume ratios of: the alloy matrix is 1 (1-4).
The alloy matrix is prepared from alloy powder, wherein the alloy powder comprises the following components 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 inevitable impurities. Wherein, the wear-resistant alloy elements (Cr, V, Mn, Mo, Ni, Ti and W) contained in the alloy matrix are at least 2.
The wear-resistant composite material can be applied to the surface of wear-resistant equipment, and the wear-resistant equipment is one of a high-pressure roller mill, a vertical mill and a lining plate;
the surfaces of the wear-resistant composite material and the wear-resistant equipment are fixed in a bolt connection mode, wherein the surface of the adopted bolt is provided with the wear-resistant composite material with the length of 2-3 cm, and therefore the whole wear resistance of the wear-resistant equipment is not affected.
The application method of the wear-resistant composite material comprises the following steps:
the method comprises the following steps: uniformly mixing the metallized ZTA ceramic particles and alloy powder of the alloy matrix according to the proportion to obtain a mixed material; wherein, according to the volume ratio, the metallized ZTA ceramic particles: 1, (1-4) alloy powder of the alloy matrix;
step two: putting the mixed material into a region needing wear resistance of the steel-based toughness component to obtain an integral material;
step three: and putting the integral 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 areas needing wear resistance of the steel-based toughness component are the grooves of the specified steel-based toughness component and the upper surface used for preparing the locking screw; wherein the steel-based toughness component is low-carbon steel or low-alloy steel, and the toughness of the steel-based toughness component is 15-100J/cm2More preferably Q235 steel or 20 steel20Cr steel, 40CrMo steel, 42CrMoV steel, 40 steel or 45 steel.
In the second step, the shape of the steel-based toughness component can be designed according to the application component required to be formulated. Wherein, the fixed position of each wear-resistant part is a cylinder reserved for the original tough groove substrate.
In the third step, the sintering process in the argon atmosphere protective furnace comprises the following steps: heating to 800-850 ℃ at the speed of 4-9 ℃/min, and keeping the temperature 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 formed by filling a wear-resistant material in a tough groove matrix; and the surface wear-resistant locking screw is used for fixing the integral sintered body and the surface of the high-pressure roller or the vertical mill.
The wear-resistant part is applied as follows:
step I: processing the surfaces of the wear-resistant part and the application part; the application part is one of a roller sleeve of the roller mill, a vertical grinding roller or a lining plate;
step II: the wear-resistant member is fixed to the surface of the application member to obtain a wear-resistant application member.
Compared with the prior art, the ZTA ceramic particles coated with the thermite reduction reaction powder and the preparation method and the application thereof have the following characteristics:
(1) the method coats the surface of ZTA ceramic particles with thermite reduction reaction powder for treatment, and the self-propagating reaction is carried out at a certain temperature, so that the surface of the ceramic particles is metallized, and the metallurgical interface combination between the metal liquid and the matrix is enhanced.
(2) ZrO at a certain temperature2-Fe2O3-MnO-CuO-Cr2O3The heat release of the Al system meets the condition that the surface coating layer of the ZTA ceramic particles generates a self-propagating reaction; thermodynamic equilibrium calculation shows that the reaction product of the system is mainly Al2O3And a solid solution of Zr-Al-Mn-Cu-Cr-Fe.
The elements in the transition layer of ZTA ceramic particles and the matrix shown in FIG. 1 and FIG. 2 areAl element and Zr element from ZTA ceramic particles, and Cr, Mn, Fe element and a small amount of Ti element from self-propagating powder reaction and matrix material. Further verifies that the thermite reduction reaction powder and ZrO in ZTA2The possibility of self-propagating reactions and the coating of the surface of ZTA ceramic particles with a metallized layer.
(3) The method is simple to operate, and avoids more complicated processes.
(4) According to the high-pressure roller mill roller sleeve, the vertical mill, the lining plate and the like, the wear-resistant block is prepared into a wear-resistant part in a bolt fixing mode. The surface of the bolt adopts a wear-resistant block compounding mode, so that the increase of the abrasion loss caused by insufficient local wear-resistant conditions is avoided.
Drawings
FIG. 1 is an SEM image of the wear-resistant component interface obtained in example 1;
FIG. 2 is an EDS spectroscopy analysis at the wear part interface obtained in example 1;
FIG. 3 is a groove of a steel-based ductile member;
FIG. 4 is a view of a steel bar and a groove of a cylindrical locking screw;
FIG. 5 is a cross-sectional installation schematic of the wear resistant component of the surface of the vertical grinding roll;
FIG. 6 is an assembled complete view (in cross-section) of the vertical grinding roll;
FIG. 7 is a cross-sectional installation schematic of the wear member on the liner surface;
FIG. 8 is a completed assembled view (cross-sectional view) of the liner panel surface;
fig. 9 is a schematic view of the installation of the surface wear resistant parts of the high pressure roller mill;
FIG. 10 is a process flow diagram of a method of making a wear resistant application component;
in the above figures, 1 is a steel bar of a locking cylinder type locking screw, 2 is a groove of the locking cylinder type locking 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 the high-pressure roller mill.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the embodiments of the present invention are not limited thereto.
In the following examples, a process flow diagram of a method for making a wear resistant application component is shown in fig. 10.
Example 1
A preparation method of the wear-resistant vertical grinding roller comprises the following steps:
step 1, surface alloying of ZTA ceramic particles:
(1) and (3) soaking the ZTA ceramic particles with the average particle size of 2mm in water for 10h, then putting the ZTA ceramic particles into ethanol, washing for 3 times, and drying to obtain the dried ZTA ceramic particles.
(2) Taking the mass ratio as aluminothermic reduction reaction powder: weighing thermite reduction reaction powder and ZTA ceramic particles, mixing the weighed thermite reduction reaction powder and a binder (a mixture of water glass and polyvinyl alcohol, wherein the mass ratio of the water glass to the polyvinyl alcohol is 1:1) and 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 thermite reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermite reduction reaction powder;
wherein the thermite reduction reaction powder comprises pure aluminum (with the mass percent purity of 99.8%) and Fe2O3、MnO、Cr2O3The mixture of (a) and (b) is pure aluminum: fe2O3:MnO:Cr2O33: 1:1: 1; wherein, the thermite reduction reaction powder is a 100-mesh screen underflow.
(3) Putting the ZTA ceramic particles coated with the aluminothermic reduction reaction powder into an argon atmosphere protective furnace for self-propagating sintering, heating to 500 ℃ at the speed of 8 ℃/min, and preserving heat for 60 min; heating to 1000 deg.C at a speed of 4 deg.C/min, maintaining for 3 hr, and cooling with the furnace. Further obtaining a framework material of ZTA ceramic particles coated by thermite reduction reaction powder;
in this process, the ZrO in the ZTA ceramic particles coated with the thermite reduction reaction powder2+Fe2O3+MnO+Cr2O3+ pure aluminum takes place self-propagating reaction to form Zr-Al-Mn-Cr-Fe solid solutionThe bulk metallization layer is coated on the surface of the ZTA particles.
(4) 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 with the average particle size of 2 +/-0.2 mm.
Step 2, preparing a wear-resistant part:
the wear-resistant part comprises a wear-resistant area of the steel-based toughness part and a wear-resistant composite material arranged on the wear-resistant area of the steel-based toughness part; wherein the wear-resistant composite comprises metallized ZTA ceramic particles and a metal matrix;
(1) the preparation method comprises the following steps of 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: 6%, Mn 10.0%, Cr 2%, Ti: 20%, W: 10%, P0.02%, S0.01%, and the balance of Fe and inevitable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and carrying out metallization on the ZTA ceramic particles according to the volume ratio: after the alloy matrix is prepared in a ratio of 1:4, the alloy matrix is put into a powder mixer to be mixed for 3 hours, and the mixed material is put into a groove (shown in figure 3) of a 20 steel-based toughness component and a groove 2 (shown in figure 4) of a cylindrical locking screw in the upper surface of a steel rod 1 of the cylindrical locking screw to obtain the integral material.
(3) Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 800 ℃ at the speed of 4 ℃/min, and preserving heat for 1 h; heating to 1200 ℃ at the speed of 5 ℃/min, preserving heat for 5h, and cooling along with the furnace to obtain the wear-resistant part. In the wear-resistant part, an interface with the width of 20-30 mu m is formed between ZTA ceramic particles and a matrix (see figure 1), and effective metallurgical interface bonding is achieved.
The EDS spectrum at the interface is analyzed, the result is shown in figure 2, and the analysis of figure 2 shows that the elements existing in the transition layer of the ZTA ceramic particles and the matrix are Al element and Zr element from the ZTA ceramic particles, and Cr element, Mn element, Fe element and a small amount of Ti element from the self-propagating powder reaction and the matrix material.
Step 3, preparing the vertical grinding roller:
(1) processing a cylinder reserved in the integral sintered body and a wear-resistant part (a locking screw cylinder for fixing), and processing the cylinder and the wear-resistant part by using the matched screw size;
(2) the wear-resistant member 4 is fixed to the surface of the vertical grinding roll 3 to be used (see fig. 5 and 6).
Example 2
A preparation method of a wear-resistant roller sleeve of a high-pressure roller mill comprises the following steps:
step 1, surface alloying of ZTA ceramic particles:
(1) and (3) cleaning the ceramic particles, namely firstly putting the ZTA ceramic particles with the average particle size of 3mm into water for soaking for 24h, then putting the ZTA ceramic particles into ethanol for cleaning for 4 times, and then drying to obtain the dried ZTA ceramic particles.
(2) The aluminum thermal reduction reaction powder comprises the following components in percentage by mass: weighing thermite reduction reaction powder and ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (a mixture of water glass, PAM and phenolic resin, wherein the mass ratio of the water glass to the PAM to the phenolic resin is 1:1:1) to obtain dried 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 with the thermite reduction reaction powder;
the aluminothermic reduction reaction powder is a mixture of aluminum-iron powder (mass percent, 50% of aluminum and the balance of iron) and MnO and CuO, and the aluminum-iron powder comprises the following components in percentage by mass: MnO: 1, CuO: 1: 2; wherein, the thermite reduction reaction powder is a 100-mesh screen underflow.
(3) Putting the ZTA ceramic particles coated with the aluminothermic reduction reaction powder into an argon atmosphere protective furnace for self-propagating sintering, heating to 600 ℃ at the speed of 10 ℃/min, and preserving the temperature for 90 min; heating to 1350 deg.C at 8 deg.C/min, holding for 10 hr, and cooling. Further obtaining the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder.
(4) 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 with the average particle size of 3 +/-0.2 mm.
Step 2, preparing a wear-resistant part:
the wear-resistant part comprises a wear-resistant area of the steel-based toughness part and a wear-resistant composite material arranged on the wear-resistant area of the steel-based toughness part; wherein the wear-resistant composite comprises metallized ZTA ceramic particles and a metal matrix;
(1) the preparation method comprises the following steps of 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: 1.0%, Mn: 20%, Cr 4%, Mo: 20%, P0.02%, S0.01%, and the balance of iron and inevitable impurities.
(2) Weighing alloy powder of metallized ZTA ceramic particles and an alloy matrix, preparing the alloy powder according to the volume ratio of 1:1, putting the mixture into a powder mixer for mixing for 10 hours, putting the mixed material into a groove of a Q235 steel-based toughness component and a groove on the upper surface of a cylindrical Q235 steel bar for manufacturing a locking screw, and obtaining the integral material.
(3) Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 850 ℃ at the speed of 6 ℃/min, and preserving heat for 3 h; heating to 1600 ℃ at the speed of 8 ℃/min, preserving heat for 10h, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, an interface of 30 μm width is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
Step 3, preparing a roller sleeve of the high-pressure roller mill:
(1) processing a cylinder reserved in the integral sintered body and a wear-resistant part (a locking screw cylinder for fixing), and processing the cylinder and the wear-resistant part by using the matched screw size;
(2) the wear resistant part 4 is fixed to the surface of the high pressure roller mill shell 6 to be applied (fig. 9).
Example 3
A method of making a wear resistant liner plate comprising the steps of:
step 1, surface alloying of ZTA ceramic particles:
(1) and (3) cleaning the ceramic particles, namely soaking the ZTA ceramic particles with the average particle size of 2mm in water for 12h, then cleaning the ZTA ceramic particles in ethanol 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: weighing thermite reduction reaction powder and ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (a mixture of water glass, PVA and phenolic resin, wherein the mass ratio of the water glass to the PVA to the phenolic resin is 1:1:1) to obtain dried ZTA ceramic particles, and then adding the dried ZTA ceramic particles into the mixture and stirring the mixture to ensure that the thermite reduction reaction powder is uniformly coated on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermite reduction reaction powder;
wherein the aluminothermic reduction reaction powder is pure aluminum (mass percent purity)>99.9%) and Fe2O3The mixture of (a) and (b) is pure aluminum: fe2O31: 2; wherein, the thermite reduction reaction powder is a 100-mesh screen underflow.
Through analysis, the ZTA ceramic particles coated with the thermite reduction reaction powder are of a core-shell structure with the ZTA ceramic particles as a core and the thermite reduction reaction powder as a shell.
(3) Putting the ZTA ceramic particles coated with the aluminothermic reduction reaction powder into an argon atmosphere protective furnace for self-propagating sintering, heating to 520 ℃ at the speed of 9 ℃/min, and preserving heat for 70 min; heating to 1220 deg.C at 5 deg.C/min, holding for 5 hr, and cooling. Further obtaining the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder.
(4) And crushing the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder to obtain the metallized ZTA ceramic particles.
Step 2, preparing a wear-resistant part:
the wear-resistant part comprises a wear-resistant area of the steel-based toughness part and a wear-resistant composite material arranged on the wear-resistant area of the steel-based toughness part; wherein the wear-resistant composite comprises metallized ZTA ceramic particles and a metal matrix;
(1) preparing an alloy matrix in the wear-resistant composite material, wherein 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%, and the balance of iron and inevitable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and taking the alloy powder as the metallized ZTA ceramic particles according to the volume ratio: after the alloy matrix is prepared in a ratio of 1:2, the alloy matrix is put into a powder mixer to be mixed for 5 hours, and the mixed material is put into a groove of a 20Cr steel-based toughness component and a groove of a cylindrical locking screw in the upper surface of a cylindrical 20Cr rod for manufacturing the locking screw, so that the integral material is obtained.
(3) Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 820 ℃ at the speed of 5 ℃/min, and preserving heat for 2 h; heating to 1380 ℃ at the speed of 6 ℃/min, preserving heat for 6 hours, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, a 28 μm wide interface is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
Step 3, preparing a lining plate:
(1) processing a cylinder reserved in the integral sintered body and a wear-resistant part (a locking screw cylinder for fixing), and processing the cylinder and the wear-resistant part by using the matched screw size;
(2) the wear-resistant member 4 is fixed to the surface of the backing plate 5 to be applied (see fig. 7 and 8).
Example 4
A preparation method of the wear-resistant vertical grinding roller comprises the following steps:
step 1, surface alloying of ZTA ceramic particles:
(1) and (3) soaking the ZTA ceramic particles in water for 16h, then putting the ZTA ceramic particles into ethanol, washing 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: weighing thermite reduction reaction powder and ZTA ceramic particles, stirring the weighed thermite reduction reaction powder and a binder (a mixture of PVA and phenolic resin, wherein the mass ratio of the PVA to the phenolic resin is 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 with the thermite reduction reaction powder;
wherein the aluminothermic reduction reaction powder is pure aluminum (mass percent purity)>99.9%) and Fe2O3CuO, pure aluminum: CuO: fe2O32:1: 2; wherein, the thermite reduction reaction powder is a 100-mesh screen underflow.
(3) Putting the ZTA ceramic particles coated with the thermite reduction reaction powder into an argon atmosphere protective furnace for self-propagating sintering, heating to 540 ℃ at the speed of 8.5 ℃/min, and preserving heat for 80 min; heating to 1300 ℃ at the speed of 5.5 ℃/min, preserving heat for 4h, and then cooling along with the furnace. Further obtaining the framework material of the ZTA ceramic particles coated by the thermite reduction reaction powder.
(4) 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.
Step 2, preparing a wear-resistant part:
the wear-resistant part comprises a wear-resistant area of the steel-based toughness part and a wear-resistant composite material arranged on the wear-resistant area of the steel-based toughness part; wherein the wear-resistant composite comprises metallized ZTA ceramic particles and a metal matrix;
(1) preparing an alloy matrix in the wear-resistant composite material, wherein 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%, and the balance of iron and unavoidable impurities.
(2) Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and taking the alloy powder as the metallized ZTA ceramic particles according to the volume ratio: after the alloy matrix is prepared in a ratio of 1:3, the alloy matrix is put into a powder mixer to be mixed for 7 hours, and the mixed material is put into a groove of a 40Cr steel-based toughness component and a groove of a cylindrical locking screw in the upper surface of a cylindrical 40Cr steel bar for manufacturing the locking screw, so that the integral material is obtained.
(3) Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 800 ℃ at the speed of 9 ℃/min, and preserving heat for 60 min; heating to 1320 ℃ at the speed of 4 ℃/min, preserving heat for 4h, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, an interface of 21 μm width is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
Step 3, preparing the vertical grinding roller:
(1) processing a cylinder reserved in the integral sintered body and a locking screw cylinder for fixing, and processing the cylinder by using the size of a matched screw;
(2) the wear resistant member is secured to the surface of the vertical roll for the desired application.
Example 5
A method for preparing a high-wear-resistance vertical grinding roller, which is the same as the embodiment 1 except that:
in the step 1:
the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is as follows: stirring the thermite reduction reaction powder and a binder (water glass and phenolic resin in a mass ratio of 1:1) (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 thermite reduction reaction powder coated ZTA ceramic particles;
self-propagating sintering, heating to 580 ℃ at the speed of 9.5 ℃/min, and keeping the temperature for 70 min; heating to 1300 ℃ at the speed of 4.5 ℃/min, preserving heat for 4h, and cooling along with the furnace to obtain the framework material of the ZTA ceramic particles coated with the thermite 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: 2.5%, Mn: 18%, Ni 1%, W: 30 percent of P, 0.02 percent of S, and the balance of iron and inevitable impurities.
The alloy powder of the metallized ZTA ceramic particles and the alloy matrix comprises the following metallized ZTA ceramic particles in volume ratio: after the alloy matrix is prepared in a ratio of 1:2, the alloy matrix is put into a powder mixer to be mixed for 3 hours, and the mixed material is put into a groove of a 40CrMo steel-based toughness component and a groove of a cylindrical locking screw in the upper surface of a cylindrical 40CrMo steel bar for manufacturing the locking screw.
Sintering the whole material, heating to 800 ℃ at the speed of 8.5 ℃/min, and preserving heat for 65 min; heating to 1350 ℃ at the speed of 6 ℃/min, preserving heat for 6h, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, a 27 μm wide interface is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
The rest of the procedure was the same as in example 1.
Example 6
The preparation method of the high-wear-resistant high-pressure roller mill roller sleeve is the same as that in example 2, except that:
in the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is as follows: stirring the thermite reduction reaction powder and a binder (a mixture of water glass and PAM, wherein the mass ratio of the water glass to the PAM is 1:1) according to a mass ratio, 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 with the thermite reduction reaction powder;
self-propagating sintering, heating to 600 ℃ at the speed of 9.5 ℃/min, and keeping the temperature for 65 min; heating to 1310 ℃ at the speed of 4.5 ℃/min, preserving the heat for 5.5h, and then cooling along with the furnace to obtain the framework material of the ZTA ceramic particles coated with the thermite 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 powder of the alloy matrix in the wear-resistant composite material comprises the following components in percentage by mass: c: 2%, 20% of Cr, and Mn: 17%, P0.02%, S0.01%, and the balance of iron and inevitable impurities.
Alloy powder of metallized ZTA ceramic particles and an alloy matrix, which is prepared by mixing, by volume, metallized ZTA ceramic particles: after the alloy matrix is prepared in a ratio of 1:3, the alloy matrix is put into a powder mixer to be mixed for 5.5 hours, and the mixed material is put into a groove of a 42CrMoV steel-based toughness component and a groove on the upper surface of a cylindrical 42CrMoV steel bar for manufacturing a locking screw.
Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 850 ℃ at the speed of 6 ℃/min, and preserving heat for 3 h; heating to 1450 ℃ at the speed of 8 ℃/min, preserving heat for 10h, and cooling along with the 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 effective metallurgical interface bonding.
The rest of the procedure was the same as in example 2.
Example 7
A method for preparing a high-wear-resistance lining plate, which is the same as that in example 3, and is different from the following steps:
in the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is as follows: stirring the thermit reduction reaction powder and a binder (a mixture of PVA, PAM and phenolic aldehyde resin, in a mass ratio of PVA to PAM to phenolic aldehyde resin being 1:2:1) (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 thermit reduction reaction powder on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermit reduction reaction powder;
wherein the aluminothermic reduction reaction powder is pure aluminum (mass percent purity)>99.8%) and Fe2O3The mixture of (a) and (b) is pure aluminum: fe2O31: 2; wherein, the thermite reduction reaction powder is 200 meshes of screen underflow.
Self-propagating sintering, heating to 550 ℃ at the speed of 9.5 ℃/min, and keeping the temperature for 75 min; heating to 1310 ℃ at the speed of 4.5 ℃/min, preserving the heat for 5.5h, and then cooling along with the furnace to obtain the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder. Then crushing and screening the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder to obtain the homogenized metalized ZTA ceramic particles.
In the step 2, 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%, 30% of Ni, and Ti: 1%, Mn: 20%, P0.02%, S0.01%, and the balance of iron and inevitable impurities.
The alloy powder of the metallized ZTA ceramic particles and the alloy matrix is prepared by the following steps of: after the alloy matrix is prepared in a ratio of 1:2.5, the alloy matrix is put into a powder mixer to be mixed for 6 hours, and the mixed material is put into a groove of a 40 steel-based toughness component and a groove in the upper surface of a cylindrical 40 steel bar for manufacturing a locking screw.
Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 820 ℃ at the speed of 5 ℃/min, and preserving heat for 2.5 h; heating to 1400 ℃ at the speed of 6.5 ℃/min, preserving heat for 7.5h, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, an interface of 30 μm width is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
The rest of the procedure was the same as in example 3.
Example 8
A method for preparing a high-wear-resistance vertical grinding roller, which is the same as the embodiment 4 except that:
in the step 1, the mass ratio of the thermite reduction reaction powder to the ZTA ceramic particles is as follows: mixing thermit reduction reaction powder with binders (water glass, PVA, PAM and phenol aldehyde resin, the mass ratio of the water glass to the PVA to the phenol aldehyde resin is 2:1:1:1) to stir (wherein, the total mass of the binders is 15 percent of the total mass of the ZTA ceramic particles), adding the dried ZTA ceramic particles, and stirring to ensure that the thermit reduction reaction powder is uniformly coated on the surfaces of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermit reduction reaction powder;
wherein the aluminothermic reduction reaction powder is pure aluminum (mass percent purity)>99.9%) and Fe2O3In the mixing ofPure aluminum: fe2O31: 4; wherein, the thermite reduction reaction powder is 500 meshes of screen underflow.
Self-propagating sintering, heating to 560 ℃ at the speed of 8 ℃/min, and preserving heat for 80 min; heating to 1325 ℃ at the speed of 5 ℃/min, preserving heat for 6h, and cooling along with the furnace to obtain the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder. Then crushing the framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder, and screening to obtain the homogenized metallized ZTA ceramic particles.
In the step 2, 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: 4%, Cr 1%, W: 4%, Mn: 40%, P0.02%, S0.01%, and the balance of Fe and inevitable impurities.
Weighing alloy powder of the metallized ZTA ceramic particles and the alloy matrix, and taking the alloy powder as the metallized ZTA ceramic particles according to the volume ratio: after the alloy matrix is prepared in a ratio of 1:2.5, the alloy matrix is put into a powder mixer to be mixed for 6 hours, and the mixed material is put into a groove of the 45 steel-based toughness component and a groove in the upper surface of a cylindrical 45 steel bar for manufacturing the locking screw.
Putting the integral material into an argon atmosphere protective furnace for sintering, heating to 800 ℃ at the speed of 5.5 ℃/min, and preserving heat for 3 hours; heating to 1420 ℃ at the speed of 7 ℃/min, preserving heat for 8h, and cooling along with the furnace to obtain the wear-resistant part. In the wear resistant component, a 45 μm wide interface is formed between the ZTA ceramic particles and the matrix, achieving effective metallurgical interface bonding.
The rest of the procedure was the same as in example 4.
Comparative example 1
A method for preparing a vertical grinding roller, which is the same as the embodiment 1, and is characterized in that:
the adopted thermite reduction reaction powder coated ZTA ceramic particles only contain pure aluminum (mass percent purity)>99.9%) and does not contain Fe which is easy to generate self-propagating reaction2O3、MnO、CuO、Cr2O3And the like.
Putting the ZTA ceramic particles coated with the thermite reduction reaction powder into an argon atmosphere protective furnace, heating to 500 ℃ at the speed of 8 ℃/min, and preserving the temperature for 60 min; then the temperature is raised to 1000 ℃ at the speed of 4 ℃/min, and the furnace is cooled after the temperature is preserved for 3 h.
Observation shows that because of no adsorption effect of other refractory oxide powder, a part of aluminum powder flows to the bottom of the crucible after being melted, and the other part of aluminum powder is adsorbed on the surfaces of ZTA particles to form a coating layer. The coating is not in contact with ZrO in ZTA particles2The components are subjected to self-propagating reaction, only physical adsorption is carried out, and a metallurgical bonding metallization layer cannot be formed on the surface of ZTA particles.

Claims (10)

1. The ZTA ceramic particles coated with the thermite reduction reaction powder are characterized in that the ZTA ceramic particles coated with the thermite reduction reaction powder are in a ZTA ceramic particle/thermite reduction reaction powder core-shell structure; according to the mass ratio, the aluminothermic reduction reaction powder: ZTA ceramic particles ═ 1: (3-10);
the aluminothermic reduction reaction powder is a mixture of an aluminum source and a metal oxide capable of carrying out aluminothermic reduction reaction, and the mass ratio of the aluminum source: metal oxide capable of thermite reduction reaction ═ 1: (1-4).
2. The thermite reduction reaction powder coated ZTA ceramic particles according to claim 1, wherein the aluminum source is pure aluminum powder and/or the ferro-aluminum powder is aluminum source; the metal oxide capable of aluminothermic reduction is Fe2O3、MnO、CuO、Cr2O3One or more of them.
3. The thermite reduction reaction powder-coated ZTA ceramic particle according to claim 1, wherein the shell further comprises a binder, the binder is one or more of water glass, polyvinyl alcohol, polyacrylamide or phenolic resin, and the total amount of the binder is 5-20% of the total mass of the ZTA ceramic particle.
4. The method for producing the thermite reduction reaction powder-coated ZTA ceramic particle as claimed in any one of claims 1 to 3, comprising the steps of:
(1) removing impurities from ZTA ceramic particles, cleaning, and drying to obtain dried ZTA ceramic particles;
(2) weighing thermite reduction reaction powder according to a ratio, uniformly stirring the thermite reduction reaction powder and a binder, adding the dried ZTA ceramic particles, and stirring to uniformly coat the thermite reduction reaction powder on the surface of the dried ZTA ceramic particles to obtain the ZTA ceramic particles coated with the thermite reduction reaction powder.
5. The use of the thermite reduction reaction powder-coated ZTA ceramic particle according to any one of claims 1 to 3, wherein the metallized ZTA ceramic particle is obtained by self-propagating sintering of the thermite reduction reaction powder-coated ZTA ceramic particle.
6. The use of thermite reduction reaction powder coated ZTA ceramic particles according to claim 5, wherein said self-propagating sintering comprises the steps of:
step 1: self-propagating sintering
Placing the ZTA ceramic particles coated with the thermite reduction reaction powder in an argon atmosphere protective furnace for self-propagating sintering to obtain a framework material of the ZTA ceramic particles coated with the thermite reduction reaction powder;
step 2: crushing
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.
7. The use of the thermite reduction reaction powder coated ZTA ceramic particles according to claim 6, wherein in the step 1, the self-propagating sintering process is: heating to 500-600 ℃ at the speed of 8-10 ℃/min, and keeping the temperature 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.
8. A wear-resistant composite comprising the metallized ZTA ceramic particles of claim 6, further comprising an alloy matrix, wherein the metallized ZTA ceramic particles are, by volume: 1, (1-4) an alloy matrix;
the alloy matrix is prepared from alloy powder, wherein the alloy powder comprises the following components 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 inevitable impurities; wherein, the wear-resistant alloy elements (Cr, V, Mn, Mo, Ni, Ti and W) contained in the alloy matrix are at least 2.
9. The method of using the abrasion-resistant composite material of claim 8, comprising the steps of:
the method comprises the following steps: uniformly mixing the metallized ZTA ceramic particles and alloy powder of the alloy matrix according to the proportion to obtain a mixed material; wherein, according to the volume ratio, the metallized ZTA ceramic particles: 1, (1-4) alloy powder of the alloy matrix;
step two: putting the mixed material into a region needing wear resistance of the steel-based toughness component to obtain an integral material;
step three: putting the integral material into an argon atmosphere protection furnace for sintering to form a wear-resistant part; the sintering process in the argon atmosphere protective furnace comprises the following steps: heating to 800-850 ℃ at the speed of 4-9 ℃/min, and keeping the temperature 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 formed by filling a wear-resistant material in a tough groove matrix; and a surface wear-resistant locking screw for fixing the integral sintered body and the surface of the high-pressure roller or the vertical mill;
in the wear-resistant member, an interface having a width of 20 to 50 μm is formed between ZTA ceramic particles and an alloy matrix.
10. The method of using the wear-resistant composite material of claim 9, wherein the wear-resistant component is produced by:
step I: processing the surfaces of the wear-resistant part and the application part; the application part is one of a roller sleeve of the roller mill, a vertical grinding roller or a lining plate;
step II: the wear-resistant member is fixed to the surface of the application member to obtain a wear-resistant application member.
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