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Building method of friction surface of ceramic layer of porous structure

A technology of porous structure and friction surface, applied in ceramic products, coatings, household appliances, etc., can solve the problem of poor wear resistance of mechanical parts surface, and achieve the effect of improving wear resistance.

Active Publication Date: 2018-08-10
JILIN UNIV
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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 provide a simple and effective method that can directly construct a porous structure ceramic layer on the surface of steel to solve the problem of poor wear resistance on the surface of mechanical parts

Method used

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  • Building method of friction surface of ceramic layer of porous structure
  • Building method of friction surface of ceramic layer of porous structure
  • Building method of friction surface of ceramic layer of porous structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 2 As shown, the construction of the friction surface is carried out according to the following steps.

[0028] (1) Substrate pretreatment: 45# steel substrate 1 was ultrasonically cleaned with acetone / petroleum ether and absolute ethanol in sequence to remove surface oil stains, and dried with nitrogen.

[0029] (2) Preparation of porous structure ceramic raw material:

[0030] a. Weigh SiC powder, sintering aids, absolute ethanol according to the mass ratio of 100:5:10, wherein the sintering aids albite powder, Si powder, Al 2 o 3 The powder mass ratio is 2:1:1. Wherein, the particle size of the SiC powder is 0.2-1 μm, and the particle size of the sintering aid powder is 0.5-1 μm.

[0031] b. Mix the mixed raw materials in step a by ball milling in a nylon ball mill tank. The ball material is SiC. After 10 hours of ball milling, add PVB ethanol solution with a mass concentration of 5%, and continue ball milling for 1 hour. Wherein, the mass of the ...

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 lies in that in step a, the mass ratio of SiC:sintering aid is 100:10, and the particle size of SiC powder is 2-8 μm. The quality of the PMMA micropowder is 30% of that of the SiC powder in step d. In step (4), the thickness of the metal solder powder layer is 40 μm, and the thickness of the original powder layer of the porous structure ceramic is 100 μm. In step (5), the laser power is 20W. The other steps are the same as in Example 1, and the apparent porosity of the frictional surface functional structural layer is 37.6%, the compressive strength is 73MPa, and the wear resistance is more than 11 times higher than that of the metal matrix.

Embodiment 3

[0041]The difference between this embodiment and embodiment 1 lies in that in step a, the mass ratio of SiC:sintering aid is 100:15, and the particle size of SiC powder is 10-20 μm. The quality of the PMMA micropowder is 40% of that of the SiC powder in step d. In step (4), the thickness of the metal solder powder layer is 80 μm, and the thickness of the original powder layer of the porous structure ceramic is 160 μm. In step (5), the laser power is 25W. The other steps are the same as in Example 1, and the apparent porosity of the frictional surface functional structural layer is 45.8%, the compressive strength is 67MPa, and the wear resistance is more than 9 times higher than that of the metal matrix.

[0042] Such as figure 1 Shown, the friction surface with porous structure ceramic layer prepared by the method of the present invention comprises substrate 1, connection layer 2 and functional structure layer 3, substrate 1 is steel, connection layer 2 is metal solder, and ...

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Abstract

The invention relates to a building method of a friction surface of a ceramic layer of a porous structure. According to the method, SiC powder, sodium feldspar powder, Si powder, Al2O3 powder, PMMA powder and PVB are mixed according to a certain proportion ratio and procedures to be prepared into functional structure original powder; Ag-Cu-Ti metal brazing materials and PVB are uniformly mixed tobe made into connecting layer powder; steel materials are used as base bodies; the connecting layer powder, the porous structure ceramic original powder and the selective laser sintering powder layerare sequentially laid to form a prefabricated body; the prefabricated body is put into a vacuum sintering furnace to be sintered; a friction surface having a functional structure and using the steel materials as the base bodies can be obtained. The connection step of the porous ceramics and the steel material base bodies is simplified; the porous ceramic functional surfaces are directly prepared on the steel material base body; due to the high-wear-resistant characteristics and the capability of the porous ceramics of storing lubricating oil and friction chips, the anti-abrasion capability ofthe steel materials is greatly improved; the steel material base bodies and the functional surfaces are subjected to high-intensity connection through a metal brazing material connection layer; the ceramic layer cannot be easily peeled off.

Description

technical field [0001] The invention belongs to the field of functional surface manufacture, and in particular relates to a method for constructing a friction surface with a porous structure ceramic layer. Background technique [0002] Existing mechanical parts are mainly made of steel, which widely suffers from poor wear resistance. New wear-resistant alloys can improve wear resistance to a certain extent, but they often have disadvantages such as high cost and difficult manufacturing, and are currently difficult to replace traditional steel for widespread use. Surface carburizing and other surface treatment methods of steel can improve the surface hardness and wear resistance while maintaining the toughness of the core steel and improving the comprehensive performance of the steel, but the degree of improvement is limited. [0003] Ceramics have high strength and high wear resistance, and building a ceramic layer on the surface of steel can greatly improve the wear resist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/622C04B35/64C04B38/06C23C24/10
Inventor 张志辉王胡军林鹏宇刘镇宁梁云虹李秀娟马志超赵杰刘强郑龙于征磊任露泉
Owner JILIN UNIV
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