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A self-lubricating wear-resistant composite coating and its preparation method and application

A composite coating, self-lubricating layer technology, applied in the coating, metal material coating process, melt spraying and other directions, can solve the problems of inappropriate dimensional accuracy parts, large heat input of laser cladding, etc., to achieve high bonding strength , the effect of low friction coefficient and good bonding strength

Active Publication Date: 2021-11-30
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Application publication number is CN 102363853A Invention Patent "Preparation Method of Solid Self-lubricating Composite Material and Solid Self-lubricating Coating" uses a laser method to clad a certain proportion of nickel-chromium alloy, chromium carbide, tungsten disulfide, and calcium fluoride A wear-resistant and self-lubricating coating is formed on the surface of the substrate. Laser cladding heat input is large, and the thermal deformation of the substrate is serious. It is not suitable for parts with high dimensional accuracy and strict deformation control.

Method used

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  • A self-lubricating wear-resistant composite coating and its preparation method and application
  • A self-lubricating wear-resistant composite coating and its preparation method and application
  • A self-lubricating wear-resistant composite coating and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] (1) Mix 50wt% MoB hard ceramic particles and 50wt% nickel-based alloy, and ball mill to obtain the wear-resistant material for the shielding support layer; wherein, the nickel-based alloy contains the following components: Cr 30wt%, Ni 70wt%;

[0050] (2) After the substrate is cleaned and degreased, and sandblasted and roughened, the wear-resistant material of the shielding support layer prepared in step (1) is used as a raw material to form MoB- 15Cr-35Ni cermet coating is used as the shielding support layer, and the average thickness of the coating is 112μm;

[0051] (3) Mix 50wt% WC hard ceramic particles and 50wt% nickel-based alloy, and ball mill to obtain a functional composite layer wear-resistant material, wherein the nickel-based alloy contains the following components: Cr 35wt%, B 1wt%, Si 1.9wt%, Ni balance;

[0052] (4) Graphite (with a particle size of 10-40 μm) and MoS 2 (with a particle size of 10-40 μm) deposited a layer of nickel on its surface by el...

Embodiment 2

[0059] (1) 80wt% Cr 3 C 2 Hard ceramic particles and 20wt% nickel-based alloy are mixed and ball milled to obtain a wear-resistant material for the shielding support layer; wherein the nickel-based alloy contains the following components: Cr 25wt%, Ni 75wt%;

[0060] (2) After the substrate is cleaned and degreased, and roughened by sandblasting, the wear-resistant material of the shielding support layer prepared in step (1) is used as the raw material to form Cr 3 C 2 -5Cr-15Ni cermet coating is used as the shielding support layer, and the average thickness of the coating is 138μm;

[0061] (3) 50wt% Cr 3 C 2 Hard ceramic particles and 50wt% nickel-based alloy are mixed and ball milled to obtain a functional composite layer wear-resistant material, wherein the nickel-based alloy contains the following components: Cr 20wt%, B 3wt%, Si 4.2wt%, Ni balance;

[0062] (4) Graphite (with a particle size of 10-40 μm) and MoS 2 (with a particle size of 10-40 μm) deposited a laye...

Embodiment 3

[0069] (1) Mix 70wt% WC hard ceramic particles and 30wt% nickel-based alloy, and ball mill to obtain a wear-resistant material for the shielding support layer; wherein, the nickel-based alloy contains the following components: Cr 33.3wt%, Ni 66.7wt%;

[0070] (2) After the substrate is cleaned and degreased, and sandblasted and roughened, the wear-resistant material of the shielding support layer prepared in step (1) is used as a raw material to form WC- 10Cr-20Ni cermet coating is used as the shielding support layer, and the average thickness of the coating is 105 μm;

[0071] (3) Mix 60wt% WC hard ceramic particles and 40wt% nickel-based alloy, and ball mill to obtain a functional composite layer wear-resistant material, wherein the nickel-based alloy contains the following components: Cr 30wt%, Ni balance;

[0072] (4) Graphite (with a particle size of 10-40 μm) and MoS 2 (with a particle size of 10-40 μm) deposited a layer of nickel on its surface by electroless plating t...

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Abstract

The invention relates to the field of surface coatings, in particular to a self-lubricating and wear-resistant composite coating, a preparation method and application thereof. The self-lubricating wear-resistant composite coating includes a shielding support layer and a functional composite layer, wherein the shielding support layer is prepared from wear-resistant materials composed of hard ceramic particles and nickel-based alloys as raw materials, and belongs to cermet composite coatings. It has high hardness, high density, and plays the role of shielding corrosion and hard surface support; the functional composite layer is composed of wear-resistant materials and self-lubricating materials with gradient structure or alternating structure. This structure has both wear-resistant and friction-reducing self-lubricating properties. characteristics, while also ensuring the long-term release of solid self-lubricating materials in the composite coating. The composite coating provided by the invention can improve the antifriction and wear resistance of moving parts such as shafts and rollers under dry friction, and has good application prospects.

Description

technical field [0001] The invention relates to the field of surface coatings, in particular to a self-lubricating and wear-resistant composite coating, a preparation method and application thereof. Background technique [0002] At present, all moving parts, such as drive shafts, rollers, etc., need surface hardening treatment to achieve wear resistance, among which carbides (WC, Cr 3 C 2 )-based cermet is a relatively common process. The hard ceramic particles contained in the cermet coating make it have a large friction coefficient (μ>0.7) during dry friction, and oil lubrication is generally used; but for For some working conditions, such as inconvenient filling of lubricating oil, failure of high-temperature lubricating oil and other traditional lubrication methods are not suitable, the solid self-lubricating coating with good anti-friction and wear-resisting effects can provide a layer of solid lubricating film under dry friction, Ensure long-term safe and reliable...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/129C23C4/02
CPCC23C4/02C23C4/06C23C4/129
Inventor 武笑宇谢述锋许康威
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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