CN107338436A - A kind of iron-based composite coating and its preparation method and application - Google Patents
A kind of iron-based composite coating and its preparation method and application Download PDFInfo
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- CN107338436A CN107338436A CN201710506807.6A CN201710506807A CN107338436A CN 107338436 A CN107338436 A CN 107338436A CN 201710506807 A CN201710506807 A CN 201710506807A CN 107338436 A CN107338436 A CN 107338436A
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- 238000000576 coating method Methods 0.000 title claims abstract description 116
- 239000011248 coating agent Substances 0.000 title claims abstract description 113
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 239000002131 composite material Substances 0.000 title claims abstract description 65
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 51
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 26
- 238000005253 cladding Methods 0.000 claims abstract description 24
- 229910001634 calcium fluoride Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910033181 TiB2 Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 6
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 6
- 239000011230 binding agent Substances 0.000 claims abstract description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 20
- 239000011159 matrix material Substances 0.000 claims description 18
- 150000001875 compounds Chemical class 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000000428 dust Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 238000007788 roughening Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 9
- 238000001035 drying Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000005488 sandblasting Methods 0.000 claims description 7
- QYEXBYZXHDUPRC-UHFFFAOYSA-N B#[Ti]#B Chemical compound B#[Ti]#B QYEXBYZXHDUPRC-UHFFFAOYSA-N 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 229910000859 α-Fe Inorganic materials 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 235000011837 pasties Nutrition 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 244000137852 Petrea volubilis Species 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 2
- 229910000954 Medium-carbon steel Inorganic materials 0.000 claims description 2
- 238000011065 in-situ storage Methods 0.000 abstract description 8
- 230000002708 enhancing effect Effects 0.000 abstract description 7
- 238000005461 lubrication Methods 0.000 abstract description 5
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 14
- 239000010959 steel Substances 0.000 description 14
- 239000010410 layer Substances 0.000 description 9
- 239000000919 ceramic Substances 0.000 description 7
- 239000007787 solid Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001050 lubricating effect Effects 0.000 description 2
- 238000005272 metallurgy Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 239000003082 abrasive agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005524 ceramic coating Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 229910001651 emery Inorganic materials 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
-
- B22F1/0003—
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with 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
- C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Coating By Spraying Or Casting (AREA)
- Physical Vapour Deposition (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention discloses a kind of iron-based composite coating, weight percentage, the composite coating includes：Si 0.91 0.96%, B 3.38 3.54%, Cr 9.90 10.37%, Mo 0.61 0.64%, Ti 14.10 14.76%, N 2.79 2.93%, Ca 0.13 2.44%, F 0.12 2.32%, surplus Fe.Iron-based composite coating of the present invention contains TiB2‑TiN/CaF2, and be made by plasma cladding method, thus the high metallurgical bonding interface of intensity can be formed；The present invention synthesizes enhancing phase by in-situ authigenic, and it is firm to ensure that enhancing mutually combines between coating metal Binder Phase；Composite coating of the present invention is by adding lubrication phase CaF2, the Forming Quality of coating is improved, promotes in-situ authigenic enhancing phase TiB2TiN is evenly distributed in iron-based composite coating, ensure that the uniformity and stability of coating performance；Preparation method of the present invention is easy to implement, and productivity ratio is high, it is easy to accomplish automation；Composite coating of the present invention can be applied in fricting movement pair parts under high speed, heavy duty, high temperature and/or high stress operating mode.
Description
Technical field
The invention belongs to surface engineering technology coatings art, is related to a kind of self-lubricating wear-resistant coating, specially a kind of iron-based
Composite coating and its preparation method and application.
Background technology
In the mechanized equipment in the fields such as metallurgy, electric power, nuclear energy, Aero-Space, military project, there is largely at a high speed, again
The crucial fricting movement pair parts run under the harsh work condition environment such as load, high temperature, high stress.For these fricting movement pairs zero
Part, common lubricating oil or lubricating grease have been difficult to or can not met its antifriction drop mill demand.In order to improve these fricting movements
The service life and functional reliability of secondary parts, component surface prepare with self-lubricating solid performance wear-resistant coating into
For the effective way to solve the above problems.
Self-lubricating solid wear-resistant coating adds solid lubrication mainly with metal, ceramics or nonmetallic for basic constituent element
Agent, there is some strength and self lubricity, the composite of anti-wear performance by what certain technique was prepared.Wherein, metal
Base self-lubricating high-abrasive material can fit because having the excellent mechanical property of metal material and the excellent tribological property of kollag concurrently
The advantages that answering different bad working environments and receive much concern.At present, more metal-based self-lubricating abrasion-resistant coating material is studied with Ni-based
Based on, and the still rare report of the correlative study about iron-based self-lubricating abrasion-resistant coating material.Compared to nickel-base alloy, ferrous alloy
It is cheap, and good combination property, the friction of motion being on active service under the above-mentioned harsh operating mode that temperature is unlikely to too high are secondary zero
Iron-based self-lubricating abrasion-resistant coating material application prospect is broader on part.
As the continuous lifting developed rapidly with people to mechanized equipment quality requirements of modern industry, mechanized equipment are crucial
Tribological property requirement of the fricting movement pair parts under harsh working condition also becomes more and more higher, and exploitation in time is suitable for
The new iron-based self-lubricating wear-resistant coating material used under different harsh working conditions turns into improves these mechanized equipment matter
The strong guarantee of amount.The quality and performance of iron-based self-lubricating wear-resistant coating are relevant with its preparation method and composition.Numerous
In coating production, plasma cladding energy is high, can prepare thicker fusing point high ceramic coating and hard alloy layer, gold
Category matrix can form metallurgical binding with coating, and small on metallic matrix influence, and easy to operate, cost is relatively low, is in machinery
Equipment fricting movement pair component surface prepares the Perfected process of self-lubricating wear-resistant coating.In order to improve the wear-resisting painting of iron-based self-lubricating
The performance of layer, typically make in coating simultaneously containing the ceramic strengthening phase for lubricating phase and fabricated in situ.TiB2, TiN have high rigidity,
Excellent wearability, good chemical stability and inoxidizability, compared to single TiB2And TiN, TiB2- TiN complex phase ceramics are in
Reveal more superior combination property, be a kind of abrasion-resistive hard hardening constituent having wide application prospects.In addition, TiB2In friction process
Middle oxidation can also generate the TiO with high-temperature self-lubrication effect2.But the TiB of fabricated in situ2The ceramic phases such as-TiN are in the coating
Distribution has a major impact to coating performance.The research work of applicant early stage is once in situ using plasma cladding method success
TiB is prepared2- TiN enhancing iron-based coatings (Wang Gang, Jiang Shaoqun, Wang Zehua, Xie Yan, Zhou Zehua, are easy to rare metals and work
Journey, 2016,45 (9):2342-2346.) and include TiB2- TiN- (hBN) iron-based coating (S.Q.Jiang, G.Wang,
Q.W.Ren,C.D.Yang,Z.H.Wang,Z.H.Zhou.International Journal of Minerals,
Metallurgy and Materials,2015,22(6):613-619.), ceramic enhancement phase and coating hardness edge in coating
Layer depth direction is respectively provided with certain gradient distribution, and this directly affects the homogeneity of coating performance.CaF2With hexagonal crystal
It is layer structure, it is low along basal plane shear strength, either directly used with surface film up under conditions of 400 DEG C temperature is low,
Or it is present in the form of disperse phase in metal-base composites matrix, is respectively provided with preferable self-lubricating property, and its price is low
It is honest and clean, wide material sources, therefore, it can be used as solid lubrication phase.In addition, in plasma cladding coating, appropriate CaF is added2Be advantageous to
Improve the mouldability and structural homogenity of cladding coating, improve the quality of coating.Plasma melting is utilized but so far, yet there are no
Prepared by coating method contains TiB2-TiN/CaF2Iron-based composite coating in terms of report.
The content of the invention
The technical problem of solution：Contain TiB for plasma cladding fabricated in situ in the prior art2- TiN iron-based self-lubricating
Wear-resistant coating microscopic structure and hardness cause coating performance homogeneity poor, the present invention along layer depth direction distribution gradient
One kind is provided and contains TiB2-TiN/CaF2Iron-based composite coating, prepare microscopic structure and hardness point using plasma cladding method
The uniform iron-based self-lubricating wear-resistant coating of cloth.The coating can be applied under the operating modes such as high speed, heavy duty, high temperature or high stress be on active service
Crucial fricting movement pair component surface, and have the characteristics that cost is relatively low.
Technical scheme：A kind of iron-based composite coating, weight percentage, the composite coating include：Si 0.91-
0.96%th, B 3.38-3.54%, Cr 9.90-10.37%, Mo 0.61-0.64%, Ti 14.10-14.76%, N 2.79-
2.93%th, Ca 0.13-2.44%, F 0.12-2.32%, surplus Fe.
Preferably, the raw material of the composite coating each component is the metal dust or compound powder of respective element, and respectively
The purity of raw material is more than 99%.
Preferably, the granularity of the metal dust and compound powder is 30~105 μm.
Preferably, the thickness of the composite coating is 0.5-2.5mm.
Preferably, the composite coating is by α-Fe, TiB2、TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase composition.
A kind of preparation method of iron-based composite coating, is comprised the steps of：
(1) substrate pretreated：Matrix is subjected to deoxidation compound, roughening and surface clean successively, specially using sandblasting, sand
Paper is polished or grinder buffing method removes matrix surface oxide, untill clean metal surface is exposed until it；Roughening uses
Sandblasting is handled；Surface clean is to be cleaned in absolute ethyl alcohol, acetone soln using ultrasonic method；After cleaning
It is standby to take out drying；
(2) Feedstock treating：Ready raw material is mixed, manually or mixer is stirred, and ensures powder
End is well mixed；
(3) plasma cladding prepares iron-based composite coating：Organic adhesive is added dropwise in the powder being well mixed to step (2)
Agent, it is well mixed to pasty state, and is applied to metal base surface, thickness is depending on specific requirement, air drying under normal temperature condition
Or drying, drying temperature are less than 100 DEG C；Then metallic matrix after pre-coated processing is placed in the workbench of plasma melting coating equipment
On, prepares coating is continuously scanned on the surface of precoating compound using plasma arc, specific plasma cladding technological parameter is：With
Argon gas is as protection and ionized gas, shield gas flow rate 1.2-1.8L/min, ionized gas flow 0.8-1.2L/min, cladding
Electric current 100-110A, sweep speed 120-130mm/min, electrode spacing workpiece surface distance 10mm.
Preferably, described matrix is mild steel, medium carbon steel or stainless steel.
Taken at a high speed, under heavily loaded and/or high stress operating mode when the iron-based composite coating can be applied to temperature not higher than 500 DEG C
The surface of the fricting movement pair parts of labour, to improve its friction and wear behavior.
Beneficial effect：(1) iron-based composite coating of the present invention contains TiB2-TiN/CaF2, and pass through plasma cladding side
Method is made, thus can form the high metallurgical bonding interface of intensity；(2) enhancing phase is synthesized by in-situ authigenic, ensure that enhancing phase
It is firm to be combined between coating metal Binder Phase；(3) composite coating of the present invention is by adding lubrication phase CaF2, improve painting
The Forming Quality of layer, promote in-situ authigenic enhancing phase TiB2- TiN is evenly distributed in iron-based composite coating, ensure that coating
The uniformity and stability of energy；(4) preparation method of the present invention is easy to implement, and productivity ratio is high, it is easy to accomplish automation；(5)
Composite coating of the present invention can be applied to fricting movement pair parts under high speed, heavy duty, high temperature and/or high stress operating mode
In.
Brief description of the drawings
Fig. 1 is the X ray diffracting spectrum for the composite coating that embodiment 1 prepares；
Fig. 2 is the Cross Section Morphology figure for the composite coating that embodiment 2 prepares；
Fig. 3 is the section displaing micro tissue topography for the composite coating different layers depths that embodiment 3 prepares；Wherein (a) is
Coating bottom, (b) coating middle part, (c) is coating top.
Embodiment
Following examples further illustrate present disclosure, but should not be construed as limiting the invention.Without departing substantially from
In the case of spirit and essence of the invention, the modification and replacement made to the inventive method, step or condition, the present invention is belonged to
Scope.Unless otherwise specified, the conventional meanses that technological means used in embodiment is well known to those skilled in the art.
Embodiment 1
A kind of iron-based composite coating, weight percentage, the composite coating include：Si 0.96%, B
3.54%th, Cr 10.37%, Mo 0.64%, Ti 14.76%, N 2.93%, Ca 0.13%, F 0.12%, surplus Fe.
The raw material of the composite coating each component is the metal dust or compound powder of respective element, and each raw material is pure
Spend for more than 99%.
The granularity of the metal dust and compound powder is 30~105 μm.
The thickness of the composite coating is 0.9mm.
The composite coating is by α-Fe, TiB2、TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase composition.
A kind of preparation method of iron-based composite coating, is comprised the steps of：
(1) substrate pretreated：45 steel plates are cut into 60mm × 25mm × 6mm sheet material first, then using sand paper pair
Surface of steel plate is polished, and removes removing oxide layer, untill it exposes glossiness metal surface；Then the steel plate for milled of fighting each other
Sandblasting roughening treatment is carried out, the steel plate of roughening is finally sequentially placed the progress ultrasonic wave cleaning in absolute ethyl alcohol, acetone soln,
Temperature is room temperature during cleaning, and it is standby that steel plate drying is taken out after cleaning；
(2) Feedstock treating：Ready raw material is mixed, manually or mixer is stirred, and ensures powder
End is well mixed；
(3) plasma cladding prepares iron-based composite coating：Polyvinyl alcohol is added dropwise in the powder being well mixed to step (2),
It is well mixed to pasty state, and is applied to metal base surface, thickness is depending on specific requirement, air drying under normal temperature condition；So
The metallic matrix after pre-coated processing is placed on the workbench of plasma melting coating equipment afterwards, using plasma arc in precoating compound
Surface continuously scan prepares coating, specific plasma cladding technological parameter is：Protection and ionized gas, protection are used as by the use of argon gas
Gas flow 1.5L/min, ionized gas flow 1L/min, cladding electric current 100A, sweep speed 130mm/min, electrode spacing workpiece
Surface distance 10mm.
Taken at a high speed, under heavily loaded and/or high stress operating mode when the iron-based composite coating can be applied to temperature not higher than 500 DEG C
The surface of the fricting movement pair parts of labour, to improve its friction and wear behavior.
As shown in figure 1, coating is mainly by α-Fe, TiB after plasma cladding2、TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase
Composition.The coating prepared to embodiment 1 has carried out micro-hardness testing using HXD-1000 microhardness testers, the results showed that coating
Average microhardness be 680Hv0.2.Coating and matrix are in metallurgical binding, and microscopic structure is uniform.
Embodiment 2
A kind of iron-based composite coating, weight percentage, the composite coating include：Si 0.91%, B
3.38%th, Cr 9.90%, Mo 0.61%, Ti 14.10%, N 2.79%, Ca 2.44%, F 2.32%, surplus Fe.
The raw material of the composite coating each component is the metal dust or compound powder of respective element, and each raw material is pure
Spend for more than 99%.
The granularity of the metal dust and compound powder is 30~105 μm.
The thickness of the composite coating is 1.1mm.
The composite coating is by α-Fe, TiB2、TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase composition.
A kind of preparation method of iron-based composite coating, is comprised the steps of：
(1) substrate pretreated：Q235 steel plates are cut into 60mm × 25mm × 6mm sheet material first, then using emery wheel
Surface of steel plate is polished, removes removing oxide layer, untill it exposes glossiness metal surface；Then the steel for milled of fighting each other
Plate carries out sandblasting roughening treatment, and it is clear that the steel plate of roughening finally is sequentially placed into the progress ultrasonic wave in absolute ethyl alcohol, acetone soln
Wash, temperature is room temperature during cleaning, and it is standby that steel plate drying is taken out after cleaning；
(2) Feedstock treating：Ready raw material is mixed, is manually stirred, ensures that powder mixing is equal
It is even；
(3) plasma cladding prepares iron-based composite coating：Polyvinyl alcohol is added dropwise in the powder being well mixed to step (2),
It is well mixed to pasty state, and is applied to metal base surface, thickness is depending on specific requirement, 80 DEG C of dry 2h in drying box；Then
Metallic matrix after pre-coated processing is placed on the workbench of plasma melting coating equipment, using plasma arc in precoating compound
Prepares coating is continuously scanned on surface, and specific plasma cladding technological parameter is：By the use of argon gas as protection and ionized gas, gas is protected
Body flow 1.8L/min, ionized gas flow 1.2L/min, cladding electric current 110A, sweep speed 130mm/min, electrode spacing workpiece
Surface distance 10mm.
Taken at a high speed, under heavily loaded and/or high stress operating mode when the iron-based composite coating can be applied to temperature not higher than 500 DEG C
The surface of the fricting movement pair parts of labour, to improve its friction and wear behavior.
As shown in Fig. 2 metallurgical binding between coating and matrix be present.Coating microstructure is uniform, and ceramic strengthening phase is with tiny
Block precipitation, and Dispersed precipitate, on iron-based Binder Phase matrix, coating average microhardness is about 470Hv0.2。
Embodiment 3
A kind of iron-based composite coating, weight percentage, the composite coating include：Si 0.95%, B
3.51%th, Cr 10.30%, Mo 0.63%, Ti 14.65%, N 2.91%, Ca 0.51%, F0.48%, surplus Fe.
The raw material of the composite coating each component is the metal dust or compound powder of respective element, and each raw material is pure
Spend for more than 99%.
The granularity of the metal dust and compound powder is 30~105 μm.
The thickness of the composite coating is 1.3mm.
The composite coating is by α-Fe, TiB2、TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase composition.
A kind of preparation method of iron-based composite coating, is comprised the steps of：
(1) substrate pretreated：AISI302 stainless steel plates are cut into 55mm × 25mm × 6mm sheet material first, then adopted
Surface of steel plate is polished with sand paper, removes removing oxide layer, untill it exposes glossiness metal surface；Then to polishing
Good steel plate carries out sandblasting roughening treatment, is finally sequentially placed the steel plate of roughening and is surpassed in absolute ethyl alcohol, acetone soln
Sound wave cleans, and temperature be room temperature during cleaning, taken out after cleaning steel plate dry up it is standby；
(2) Feedstock treating：Ready raw material is mixed, is manually stirred, ensures that powder mixing is equal
It is even；
(3) plasma cladding prepares iron-based composite coating：Common glue is added dropwise in the powder being well mixed to step (2),
It is well mixed to pasty state, and is applied to metal base surface, thickness is depending on specific requirement, 80 DEG C of dry 2h in drying box；Then
Metallic matrix after pre-coated processing is placed on the workbench of plasma melting coating equipment, using plasma arc in precoating compound
Prepares coating is continuously scanned on surface, and specific plasma cladding technological parameter is：By the use of argon gas as protection and ionized gas, gas is protected
Body flow 1.2L/min, ionized gas flow 0.8L/min, cladding electric current 100A, sweep speed 130mm/min, electrode spacing workpiece
Surface distance 10mm.
Taken at a high speed, under heavily loaded and/or high stress operating mode when the iron-based composite coating can be applied to temperature not higher than 500 DEG C
The surface of the fricting movement pair parts of labour, to improve its friction and wear behavior.
As shown in figure 3, the microscopic structure of coating is uniform, the tiny bulk of disperse educt on iron-based Binder Phase matrix
TiB2- TiN ceramic strengthening phases.
Claims (8)
1. a kind of iron-based composite coating, it is characterised in that weight percentage, the composite coating include：Si 0.91-
0.96%th, B 3.38-3.54%, Cr 9.90-10.37%, Mo 0.61-0.64%, Ti 14.10-14.76%, N 2.79-
2.93%th, Ca 0.13-2.44%, F 0.12-2.32%, surplus Fe.
A kind of 2. iron-based composite coating according to claim 1, it is characterised in that the raw material of the composite coating each component
For the metal dust or compound powder of respective element, and the purity of each raw material is more than 99%.
3. a kind of iron-based composite coating according to claim 2, it is characterised in that the metal dust and compound powder
Granularity be 30~105 μm.
4. a kind of iron-based composite coating according to claim 1, it is characterised in that the thickness of the composite coating is 0.5-
2.5mm。
5. a kind of iron-based composite coating according to claim 1, it is characterised in that the composite coating is by α-Fe, TiB2、
TiN、(Cr,Fe)2N1-x、Fe2B、CaF2Phase composition.
6. any a kind of preparation method of iron-based composite coating of claim 1~6, it is characterised in that comprise the steps of：
(1) substrate pretreated：Matrix is subjected to deoxidation compound, roughening and surface clean successively, specially beaten using sandblasting, sand paper
Mill or grinder buffing method remove matrix surface oxide, untill clean metal surface is exposed until it；Roughening uses sandblasting
Handled；Surface clean is to be cleaned in absolute ethyl alcohol, acetone soln using ultrasonic method；Taken out after cleaning
Dry up standby；
(2) Feedstock treating：Ready raw material is mixed, manually or mixer is stirred, and ensures that powder mixes
Close uniform；
(3) plasma cladding prepares iron-based composite coating：Organic binder bond is added dropwise in the powder being well mixed to step (2), mixes
Close uniformly to pasty state, and be applied to metal base surface, air drying or drying under normal temperature condition, drying temperature are less than 100 DEG C；
Then the metallic matrix after pre-coated processing is placed on the workbench of plasma melting coating equipment, mixed using plasma arc in precoating
Prepares coating is continuously scanned on the surface of material, and specific plasma cladding technological parameter is：By the use of argon gas as protection and ionized gas, protect
Protect gas flow 1.2-1.8L/min, ionized gas flow 0.8-1.2L/min, cladding electric current 100-110A, sweep speed 120-
130mm/min, electrode spacing workpiece surface distance 10mm.
7. the preparation method of a kind of iron-based composite coating according to claim 6, it is characterised in that described matrix is low-carbon
Steel, medium carbon steel or stainless steel.
8. claim 1~6 iron-based composite coating under arms temperature be less than 500 DEG C fricting movement pair parts table
Application in face.
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