Gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating and preparation method thereof

A diamond coating and engineering ceramic technology, applied in metal material coating process, coating, gaseous chemical plating and other directions, can solve the problems of toughness, insufficient hardness and binding force, and achieve high internal toughness, high binding force, internal The effect of high toughness and surface hardness

Active Publication Date: 2019-09-06
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve and overcome the deficiencies of the prior art, to solve the problems of low surface hardness and non-uniform coating internal structure of the existing self-lubricating coatings that lead to insufficient toughness, hardness, and bonding force, and to provide A gradient diamond / graphite composite self-lubricating anti-friction engineering ceramic coating and its preparation method is a micron / submicron / nanometer diamond / graphite composite self-lubricating anti-friction coating on the surface of engineering ceramics and its preparation method. Composite self-lubricating anti-friction engineering ceramic coating presents a micron / submicron / nano-diamond / graphite coating with a step change or a multi-level gradient change, which improves the internal toughness and surface hardness of the coating, and strengthens the graphite and diamond coating, diamond coating Bonding strength of layer to engineered ceramic substrate

Method used

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  • Gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating and preparation method thereof
  • Gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating and preparation method thereof
  • Gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating and preparation method thereof

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Effect test

Embodiment 1

[0059] In this embodiment, silicon nitride (Si 3 N 4 ) ceramics as an example, a composite self-lubricating anti-friction engineering ceramic coating is deposited on the surface of the silicon nitride ceramic substrate, the diameter of the silicon nitride ceramic substrate is 100mm, and the thickness is 10mm;

[0060] In this example:

[0061] In the micro-roughening treatment, the grade of abrasive paste used is W0.5;

[0062] In the chemical pretreatment, the composition of the prepared mixed acid solution is: sulfuric acid (H 2 SO 4 ) and hydrogen peroxide (H 2 o 2 ), its volume ratio is: H 2 SO 4 :H 2 o 2 =1:5;

[0063] Parameters of the nano-diamond particle suspension: in the nano-diamond particle suspension, the nano-diamond particle accounts for 10-15% of the total mass of the nano-diamond particle suspension.

[0064] A gradient diamond / graphite composite self-lubricating and anti-friction engineering ceramic coating, the self-lubricating and anti-friction ...

Embodiment 2

[0088] In this example, zirconia (ZrO 2 ) ceramics as an example, a composite self-lubricating anti-friction engineering ceramic coating is deposited on the surface of the zirconia ceramic substrate, the diameter of the zirconia ceramic substrate is 100mm, and the thickness is 10mm;

[0089] In this example:

[0090] In the micro-roughening treatment, the grade of abrasive paste used is W0.5;

[0091] In the chemical pretreatment, the composition of the prepared mixed acid solution is: sulfuric acid (H 2 SO 4 ) and hydrogen peroxide (H 2 o 2 ), its volume ratio is: H 2 SO 4 :H 2 o 2 =1:5;

[0092] Parameters of the nano-diamond particle suspension: in the nano-diamond particle suspension, the nano-diamond particle accounts for 10-15% of the total mass of the nano-diamond particle suspension.

[0093] A gradient diamond / graphite composite self-lubricating and anti-friction engineering ceramic coating, the self-lubricating and anti-friction engineering ceramic coating ...

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Abstract

The invention provides a gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating and a preparation method thereof, and belongs to the field of full-ceramic bearing self-lubricating wear-resistant coatings. The coating is sequentially composed of multiple stages of size-progressive diamond coatings and multiple graphite coatings from the surface of an engineering ceramic substrate to the outside; each stage of the size-progressive diamond coating comprises multiple micro-crystal diamond coatings, multiple sub-micron-crystal diamond coatings and multiplenanocrystal diamond coatings; and the diameters of crystal grains of diamonds in every two adjacent diamond coatings are stepwise decreased from the surface of the engineering ceramic substrate to the outside. The gradient diamond and graphite composite self-lubricating antifriction engineering ceramic coating is prepared through a hot filament chemical vapor deposition method. The coating is a first-stage stepwise-changed or multistage stepwise-changed micron/submicron/nano-diamond and graphite coating, the internal toughness and the surface hardness of the coating are improved, and the bonding strength of graphite and diamond coatings or the diamond coatings and the engineering ceramic substrate is enhanced. Under the limiting conditions, the durability is good, and the self-lubricatingproperty is stable.

Description

technical field [0001] The invention belongs to the technical field of self-lubricating and wear-resistant coatings for full ceramic bearings, and in particular relates to a gradient diamond / graphite composite self-lubricating and wear-reducing engineering ceramic coating and a preparation method thereof. Background technique [0002] All-ceramic bearings have excellent characteristics such as high temperature resistance, cold resistance, wear resistance, corrosion resistance, anti-magnetic and electrical insulation, oil-free self-lubrication, etc., and can be widely used in extremely harsh environments and special conditions such as aviation, aerospace, navigation, petroleum, and chemical industry , has gradually become an indispensable part of high-end equipment. However, the stability of the service performance of ceramic self-lubricating friction pairs has become a hot issue in related research fields for all-ceramic bearings under harsh working conditions such as hard d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C16/27C23C16/02C23C16/56
CPCC23C16/0227C23C16/029C23C16/271C23C16/56
Inventor 吴玉厚闫广宇王贺赵德宏陆峰
Owner SHENYANG JIANZHU UNIVERSITY
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