NiCr/Cr3C2/WS2 self-lubricating wear-resistant coating

A wear-resistant coating, ni80cr20-cr3c2 technology, applied in the field of NiCr/Cr3C2/WS2 self-lubricating wear-resistant coating, can solve the problems of constraints, high temperature hardness and low wear resistance

Inactive Publication Date: 2020-04-07
王洪伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its high temperature hardness and wear resistance are low, which restricts its use in high temperature friction pair parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0013] The raw materials for the preparation of NiCr / Cr3C2 / WS2 self-lubricating wear-resistant coating include: select hot-rolled 0Crl8Ni9 austenitic stainless steel as the base material, with a hardness of about 200HV, and cut it into samples of 50mm×40mm×8mm. The surface of the substrate was polished with sandpaper and cleaned with ethanol solution. The cladding material is Ni80Cr20-Cr 3 C 2 Cermet powder, wherein the total mass fraction of NiCr alloy is 30%, solid lubricant WS 2 The added amount is 30%. The preparation steps of the NiCr / Cr3C2 / WS2 self-lubricating and wear-resistant coating are as follows: weighing with an electronic balance, mixing, and putting into a ball mill (QM-SP04) for ball milling for 2 hours. Then the mixed powder was pre-placed on the 0Crl8Ni9 substrate with a thickness of about 1.5 mm using methylcellulose binder. Finally, put it into a drying oven, heat it to 80°C and dry it for 2 hours. Laser cladding equipment adopts GS-TFI-10kW high-power...

Embodiment example 2

[0015] Laser cladding NiCr / Cr 3 C 2 The coating is mainly composed of Cr 7 C 3 And γ-(Fe, Ni) composition. Join WS 2 Coating Cr removal 7 C 3 , γ-(Fe, Ni), (Cr, W) C main phase, there is also a small amount of WS 2 and CrS, which is due to WS 2 Lower decomposition temperature (510°C) and oxidation temperature (539°C), most WS 2 It is decomposed into W and S, part of S reacts with Cr element to form CrS, and W combines with Cr and C to form (Cr, W) C composite carbide. S element does not react with Ni and Fe in the molten pool to form other sulfides, firstly because the Gibbs free energy of formation of NiS and FeS is much higher than that of WS 2 and CrS, in addition, the content of Cr element in the high-temperature molten pool is the highest, followed by W, so WS 2 And CrS is preferentially precipitated from the molten pool. NiCr / Cr 3 C 2 -30%WS 2 The microhardness of the coating is 1000-1240HV 0.3 Between, the average is 1129HV 0.3 , about 5 times that of th...

Embodiment example 3

[0017] The coefficient of friction of both coatings decreases with increasing temperature, and at all tested temperatures, the addition of WS 2 Coating coefficients of friction are much lower than those without coating. This is due to adding WS 2 The presence of WS in the coating 2 With CrS lubricating phase, a lubricating transfer film can be formed between the friction pair, and the direct high-stress contact between the pair and the coating can be transformed into an indirect contact between the pair and the lubricating film and between the lubricating film and the coating. The surface of the layer plays an effective protective role, thereby significantly reducing the friction factor. The wear rate of both coatings increases with increasing temperature, adding WS 2 The wear rate of the coating is less than that of the uncoated only at 300°C. The friction coefficient and wear rate of the two coatings vary widely, indicating the difference in their wear mechanisms.

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Abstract

The invention discloses a NiCr/Cr3C2/WS2 self-lubricating wear-resistant coating. A laser cladding technology is used for preparing a NiCr/Cr3C2 wear-resistant coating and a NiCr/Cr3C2-30%WS2 wear-resistant self-lubricating coating on a 0Crl8Ni9 stainless steel substrate, and the cladding coating supplemented with WS2 mainly comprises Cr7C3, a (Cr, W) C carbide reinforced phase, a gamma-(Fe, Ni)/Cr7C3 eutectic toughening phase, WS2 and a CrS lubricating phase. With the temperature rise, The two coatings are both reduced in friction factor and increased in wear rate. At room temperature and 300DEG C, the coating supplemented with WS2 has better antifriction and wear-resistant performance due to the effect of the lubricating phase. At 600 DEG C, the wear rates of the two coatings are prominently increased due to the reduction of the strength of hard phases of carbides in the coatings.

Description

[0001] Technical field [0002] The invention relates to a surface coating material, in particular to a NiCr / Cr3C2 / WS2 self-lubricating wear-resistant coating. Background technique [0003] In cutting-edge technical fields such as aviation, aerospace, nuclear energy, etc., there are a large number of frictional motion components that operate under harsh working conditions such as high vacuum, high temperature, high speed, and heavy load, such as high-temperature adiabatic engine bearings, piston rings, cylinder liners, For nuclear valves, steam turbine blades, etc., ordinary lubricating grease can no longer meet the requirements of use. Solid self-lubricating coatings are one of the effective ways to solve the above problems. At present, laser cladding is one of the effective means to prepare solid self-lubricating coatings. Due to its high energy density, the additive material and the superficial layer of the base material melt and solidify rapidly, forming a compact structur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 王洪伟
Owner 王洪伟
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