CN102618814A - Supersonic flame spraying tungsten carbide coating containing solid self-lubricating phase and preparation method of supersonic flame spraying tungsten carbide coating - Google Patents
Supersonic flame spraying tungsten carbide coating containing solid self-lubricating phase and preparation method of supersonic flame spraying tungsten carbide coating Download PDFInfo
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Abstract
The invention discloses a supersonic flame spraying tungsten carbide coating containing a solid self-lubricating phase and a preparation method of the supersonic flame spraying tungsten carbide coating. The preparation method comprises the following steps of: adding molybdenum disulfide serving as a self-lubrication phase into the conventional tungsten, cobalt/chromium carbide in the weight ratio of (10-20):(80-90); adhering the tungsten, cobalt/chromium carbide with the molybdenum disulfide by using polyvinyl acetate (PVA) in a mixed mode; drying to obtain mixed powder; and preparing a tungsten, cobalt/chromium carbide-molybdenum disulfide composite coating through a supersonic flame spraying technology. Compared with the conventional tungsten, cobalt/chromium carbide coating, the coating provided by the invention has the advantages that a dry-state sliding friction coefficient is reduced by 22 to 53 percent, and the temperature rise in the friction and abrasion process is reduced by 24 to 49 percent, so that reduction in cracking of the coating and thermal damages of a matrix in the friction and abrasion process is facilitated, and the quality and the performance of the coating can be improved. In addition, the preparation method is simple and is convenient to operate.
Description
Technical field
The invention belongs to the surface protection technique field, particularly relate to a kind of HVAF tungsten carbide coating and preparation method who contains the self-lubricating solid phase.
Background technology
Vitals such as the gear pressurized strut on the civilian and military aviation aircraft, flap-track often adopt low-alloy super-high strength steel or titanium alloy to make, to satisfy the requirement of strength of aircraft structure design.Though low-alloy super-high strength steel and titanium alloy material have good specific tenacity, shortcoming is to have surface gap susceptibility, and the surface disturbance that causes therefrom can influence the mechanical property of member.For this reason, must take adequate measures that low-alloy super-high strength steel and titanium alloy material are carried out surface protection, to improve the use properties of structural part.Through scientific research personnel's exploration, find that utilizing the HVAF technology to prepare tungsten carbide coating at these material surfaces is a kind of ideal protectiving scheme.The HVAF technology is a kind of HVOF technology that grows up the eighties in last century; Its outstanding characteristics are particle flight velocity high (can reach 700m/s); Heating temperature low (being about 3000 ℃) is particularly suitable for the labile tungsten-carbide cermet coating in spraying heating back.This Bond Strength of Coating high (>=80Mpa), density big (hole＜1%), hardness high (>=HV1000), therefore have good abrasion resistance.
Though the wear resistance of tungsten carbide coating is very good, shortcoming is that the frictional coefficient of coating is higher, so is easy to generate a large amount of heat of friction in the process of friction and wear.Owing to have the cavity in the tungsten carbide coating, and have tangible interface between coating and the matrix alloy, so the heat conductivility of coating/basal body structure is not good.In addition, in the frictional wear environment, coating and matrix cause heat accumulation at the interface easily, therefore will cause the thermal damage of matrix, this thermal damage can influence the mechanical property of matrix metal again, and the life-span of alloy is affected.Therefore the heat accumulation that reduces in the frictional wear environment is most important to the stability of coating and matrix.
Summary of the invention
In order to address the above problem; The object of the present invention is to provide a kind of frictional force and heat of friction that can reduce in the ground finish, that reduces that to damage in use appear in coating and matrix contains self-lubricating solid HVAF tungsten carbide coating and preparation method mutually.
In order to achieve the above object; The HVAF tungsten carbide coating that contains the self-lubricating solid phase provided by the invention is that tungsten carbide cobalt chrome powder and molybdenumdisulphide powder are adopted the HVAF technology to be sprayed on low-alloy super-high strength steel or titanium alloy material matrix surface and process through the powder of PVA bonding after fixing, and wherein the weight ratio of tungsten carbide cobalt chrome and molybdenumdisulphide is 80～90: 10～20.
The granularity of described tungsten carbide cobalt chrome powder is the 15-45 micron, and the granularity of molybdenumdisulphide powder is the 1-6 micron.
The preparation method who contains the HVAF tungsten carbide coating of self-lubricating solid phase provided by the invention comprises the following step that carries out in order:
1) will as the tungsten carbide cobalt chrome powder of raw material with mix in the PVA medium as self-lubricating molybdenumdisulphide powder mutually and bond together, in mixer, mixed 6 hours then;
2) with said mixture 80 ℃ of down oven dry, be incubated 4 hours and process tungsten carbide cobalt chrome and molybdenumdisulphide powder mix;
3) powder mix that has lumpd after the above-mentioned oven dry is broken into powder and sieves, choose particle size range at the powder mix of 15-45 micron as spraying raw material;
4) with the aviation kerosene be fuel; With oxygen is ignition dope; With the argon gas is powder feeding gas, adopts the HVAF machine that above-mentioned powder mix raw material is sprayed on through the low-alloy super-high strength steel of sandblasting or titanium alloy material matrix surface and forms the HVAF tungsten carbide coating that contains the self-lubricating solid phase that thickness is 200-300 μ m.
The flow of aviation kerosene is 23L/h in the described spraying process, and oxygen flow is 55000slph, and argon flow amount is 12L/min, and spray distance is 380mm, and spraying rate is 300mm/s.
The medium that described low-alloy super-high strength steel or the sandblasting of titanium alloy material matrix surface are selected for use is 60 order white fused aluminas, and blasting pressure is 0.6MPa.
The HVAF tungsten carbide coating that contains the self-lubricating solid phase provided by the invention is the molybdenumdisulphide that in traditional tungsten carbide cobalt chrome, adds as the self-lubricating phase; And adopt PVA to mix tungsten carbide cobalt chrome and molybdenumdisulphide bonding; Process powder mix after the oven dry, adopt the HVAF technology to be prepared into tungsten carbide cobalt chrome then---the molybdenumdisulphide compound coating.Compare with traditional WC-Co chromiumcoating; The coating dry state coefficient of sliding friction provided by the invention has reduced 22-53%; Intensification in the process of friction and wear has reduced 24-49%; Therefore the thermal damage of cracking and matrix of wear process floating coat that helps to reduce friction, thus the quality of coating and performance all are improved.In addition, this preparation method simple, be convenient to operation.
Description of drawings
Fig. 1 (a) is traditional tungsten carbide cobalt chrome powder morphology figure.
Fig. 1 (b) be among the embodiment 1 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.
Fig. 1 (c) be among the embodiment 2 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.
Fig. 1 (d) be among the embodiment 3 80% tungsten carbide cobalt chrome powder and 20% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.
Fig. 2 (a) is the SEM figure after traditional tungsten carbide cobalt chrome powder coating xsect polishes.
Fig. 2 (b) is the SEM figure after the polishing of 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder coatings cross-section among the embodiment 1.
Fig. 2 (c) is the SEM figure after the polishing of 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder coatings cross-section among the embodiment 2.
Fig. 2 (d) is the SEM figure after the polishing of 80% tungsten carbide cobalt chrome powder and 20% molybdenumdisulphide powder coatings cross-section among the embodiment 3.
Fig. 3 is the frictional coefficient histogram in 80% tungsten carbide cobalt chrome powder and the 20% molybdenumdisulphide powder coating dry state skimming wear process among 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder coating and the embodiment 3 among 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder coating among traditional WC-Co chromiumcoating, the embodiment 1, the embodiment 2.
Fig. 4 is a temperature lift-off value histogram in 80% tungsten carbide cobalt chrome powder and the 20% molybdenumdisulphide powder coating dry state skimming wear process among 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder coating and the embodiment 3 among 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder coating among traditional WC-Co chromiumcoating, the embodiment 1, the embodiment 2.
Embodiment
Self-lubricating solid HVAF tungsten carbide coating and the preparation method mutually that contain provided by the invention is elaborated with specific embodiment below in conjunction with accompanying drawing.
Embodiment 1:
The preparation method of the HVAF tungsten carbide coating that contains the self-lubricating solid phase that present embodiment provides comprises the following step that carries out in order:
The granularity of 1) 900 gram TAFA companies being produced is that 1350VM type tungsten carbide cobalt chrome (WC-10Co-4Cr) powder of 15-45 micron and molybdenumdisulphide (MoS2) powder that 100 gram particle degree are the 1-6 micron mix in the PVA medium and bond together; The PVA consumption mixed 6 hours in mixer can tungsten carbide cobalt chrome and molybdenumdisulphide surface complete wetting being advisable then;
2) with said mixture 80 ℃ of down oven dry, be incubated 4 hours and process tungsten carbide cobalt chrome and molybdenumdisulphide powder mix;
3) powder mix that has lumpd after the above-mentioned oven dry is broken into powder and sieves, choose particle size range in the screening of 15-45 micron as spraying raw material;
4) earlier low-alloy super-high strength steel or titanium alloy material matrix surface are carried out sandblasting before the spraying, the medium that sandblast is selected for use is 60 order white fused aluminas, and blasting pressure is 0.6Mpa;
5) be that the aviation kerosene of 23L/h is a fuel with the flow; Flow is that the oxygen of 55000slph is ignition dope; Flow is that the argon gas of 12L/min is a powder feeding gas; At spray distance is 380mm; Spraying rate is to adopt the HVAF machine that above-mentioned spraying raw material is sprayed on low-alloy super-high strength steel or the titanium alloy material matrix surface that passes through sandblasting under the condition of 300mm/s, and control spraying number of times is the HVAF tungsten carbide coating that contains the self-lubricating solid phase of 200-300 μ m until forming thickness.
Embodiment 2:
Consumption except that WC-Co chromium powder end and molybdenumdisulphide powder in the present embodiment is that all the other conditions are identical with embodiment 1 850 grams and 150 grams.
Embodiment 3:
Consumption except that WC-Co chromium powder end and molybdenumdisulphide powder in the present embodiment is that all the other conditions are identical with embodiment 1 800 grams and 200 grams.
In order to verify effect of the present invention, the inventor utilizes ESEM that structure and form that the foregoing description floating coat prepares different steps raw material in the process are observed, and Fig. 1 (a) is traditional tungsten carbide cobalt chrome powder morphology figure.Fig. 1 (b) be among the embodiment 1 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.Fig. 1 (c) be among the embodiment 2 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.Fig. 1 (d) be among the embodiment 3 80% tungsten carbide cobalt chrome powder and 20% molybdenumdisulphide powder after the PVA medium mixes again through the powder mix aspect graph of oven dry.Visible by figure, after mixing of PVA medium and drying, tungsten carbide cobalt chrome powder and molybdenumdisulphide powder bond together well.
Fig. 2 (a) is the SEM figure after traditional tungsten carbide cobalt chrome powder coating xsect polishes.Fig. 2 (b) is the SEM figure after the polishing of 90% tungsten carbide cobalt chrome powder and 10% molybdenumdisulphide powder coatings cross-section among the embodiment 1.Fig. 2 (c) is the SEM figure after the polishing of 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder coatings cross-section among the embodiment 2.Fig. 2 (d) is the SEM figure after the polishing of 80% tungsten carbide cobalt chrome powder and 20% molybdenumdisulphide powder coatings cross-section among the embodiment 3.The result shows that through after the HVAF, molybdenumdisulphide distributes in the form of sheets in the tungsten carbide cobalt chrome matrix.
In addition; The inventor utilizes vertical wear testing machine that dry state frictional coefficient and the intensification situation of the HVAF tungsten carbide coating that contains the self-lubricating solid phase in the sliding friction process of being prepared by the foregoing description analyzed, and with traditional tungsten carbide cobalt chrome powder coating as a comparison.Selecting diamond chip in the experiment for use is to grinding pair, and trier pressure is 40N, and LV is 1m/s, and test period is 300s, and the friction stroke is 300 meters.Frictional coefficient is directly read by trier, and the temperature measuring equipment that adopts trier to carry simultaneously writes down the temperature rise process in the friction process.Experimental result such as Fig. 3, shown in Figure 4, visible by figure, the coefficient of sliding friction of traditional tungsten carbide cobalt chrome powder coating is 0.478, the intensification in the skimming wear is 28.89K; The 90% tungsten carbide cobalt chrome powder and the 10% molybdenumdisulphide powder coating coefficient of sliding friction are 0.372 among the embodiment 1, and the intensification in the skimming wear is 21.91K; The coefficient of sliding friction of 85% tungsten carbide cobalt chrome powder and 15% molybdenumdisulphide powder coating is 0.258 among the embodiment 2, and the intensification in the skimming wear is 15.85K; The coefficient of sliding friction of 80% tungsten carbide cobalt chrome powder and 20% molybdenumdisulphide powder coating is 0.221 among the embodiment 3, and the intensification in the skimming wear is 14.57K.This shows that the friction and wear behavior that contains the HVAF tungsten carbide coating of self-lubricating solid phase provided by the invention all is superior to traditional tungsten carbide cobalt chrome powder coating.
Claims (4)
1. HVAF tungsten carbide coating that contains the self-lubricating solid phase; It is characterized in that: described coating is that tungsten carbide cobalt chrome powder and molybdenumdisulphide powder are adopted the HVAF technology to be sprayed on low-alloy super-high strength steel or titanium alloy material matrix surface and process through the powder of PVA bonding after fixing, and wherein the weight ratio of tungsten carbide cobalt chrome and molybdenumdisulphide is 80～90: 10～20.
2. the HVAF tungsten carbide coating that contains the self-lubricating solid phase according to claim 1 is characterized in that: the granularity of described tungsten carbide cobalt chrome powder is the 15-45 micron, and the granularity of molybdenumdisulphide powder is the 1-6 micron.
3. preparation method who contains the HVAF tungsten carbide coating of self-lubricating solid phase as claimed in claim 1, it is characterized in that: described preparation method comprises the following step that carries out in order:
1) will as the tungsten carbide cobalt chrome powder of raw material with mix in the PVA medium as self-lubricating molybdenumdisulphide powder mutually and bond together, in mixer, mixed 6 hours then;
2) with said mixture 80 ℃ of down oven dry, be incubated 4 hours and process tungsten carbide cobalt chrome and molybdenumdisulphide powder mix;
3) powder mix that has lumpd after the above-mentioned oven dry is broken into powder and sieves, choose particle size range in the screening of 15-45 micron as spraying raw material;
4) with the aviation kerosene be fuel; With oxygen is ignition dope; With the argon gas is powder feeding gas, adopts the HVAF machine that above-mentioned spraying raw material is sprayed on through the low-alloy super-high strength steel of sandblasting or titanium alloy material matrix surface and forms the HVAF tungsten carbide coating that contains the self-lubricating solid phase that thickness is 200-300 μ m.
4. the preparation method who contains the HVAF tungsten carbide coating of self-lubricating solid phase according to claim 3; It is characterized in that: the flow of aviation kerosene is 23L/h in the described spraying process; Oxygen flow is 55000slph; Argon flow amount is 12L/min, and spray distance is 380mm, and spraying rate is 300mm/s.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102896030A (en) * | 2012-10-23 | 2013-01-30 | 天津市中环天佳电子有限公司 | Screw rod for mixing mill of powder manufacturing equipment |
| CN104728511A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for processing valve element surface of high-pressure corrosion-resistant abrasion-resistant valve |
| CN104988450A (en) * | 2015-06-30 | 2015-10-21 | 苏州华日金菱机械有限公司 | Composite coating |
| CN104988453A (en) * | 2015-06-30 | 2015-10-21 | 苏州华日金菱机械有限公司 | Composite coating thermal spraying method |
| CN105950914A (en) * | 2016-05-12 | 2016-09-21 | 武汉理工大学 | Novel Ni3Al based self-lubricating material with hollow spherical powder as lubricating phase and preparation method |
| CN107699842A (en) * | 2017-09-23 | 2018-02-16 | 广东省新材料研究所 | A kind of high fine and close tungsten carbide coating roller manufacture method of solvent-free composite machine |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102896030A (en) * | 2012-10-23 | 2013-01-30 | 天津市中环天佳电子有限公司 | Screw rod for mixing mill of powder manufacturing equipment |
| CN104728511A (en) * | 2013-12-18 | 2015-06-24 | 上海宝钢工业技术服务有限公司 | Method for processing valve element surface of high-pressure corrosion-resistant abrasion-resistant valve |
| CN104988450A (en) * | 2015-06-30 | 2015-10-21 | 苏州华日金菱机械有限公司 | Composite coating |
| CN104988453A (en) * | 2015-06-30 | 2015-10-21 | 苏州华日金菱机械有限公司 | Composite coating thermal spraying method |
| CN105950914A (en) * | 2016-05-12 | 2016-09-21 | 武汉理工大学 | Novel Ni3Al based self-lubricating material with hollow spherical powder as lubricating phase and preparation method |
| CN107699842A (en) * | 2017-09-23 | 2018-02-16 | 广东省新材料研究所 | A kind of high fine and close tungsten carbide coating roller manufacture method of solvent-free composite machine |
| CN107699842B (en) * | 2017-09-23 | 2019-08-13 | 广东省新材料研究所 | A kind of high-densit tungsten carbide coating roller manufacturing method of solvent-free composite machine |
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Application publication date: 20120801 |