Method for improving friction and wear performance of thermal-sprayed Al2O3 ceramic coating

A ceramic coating, friction and wear technology, applied in the coating, metal material coating process, fusion spraying, etc., can solve the problem of coating quality decline, poor wettability, ceramic coating tribological properties can not be greatly improved, etc. problems, achieve the effect of improving the degree of wear and reducing the coefficient of friction

Active Publication Date: 2016-10-26
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] Preparation of Al on Metal Substrates by Atmospheric Plasma Spraying 2 o 3 Ceramic coating can significantly improve the protective performance of metal substrates, but due to the inherent characteristics of ceramic materials, its Al 2 o 3 The tribological properties of ceramic coatings have not been greatly improved, such as Al 2 o 3 The friction coefficient of the base coating at room temperature is about 0.5~0.6, and the wear amount is 10 -4 ~10 -5 μm / N·mm 3 between
In order to improve the friction and wear properties of thermal sprayed ceramic coatings, powders with lubricating properties, such as Ag, MoS 2 , BN, graphite, etc. Although the tribological properties of the obtained composite coating have been improved, due to the high temperature of the atmospheric plasma spraying plume, such as MoS 2 Lubricants such as graphite and graphite must be coated with metal before spraying; and the prepared coating is due to metal and ceramic Al 2 o 3 The wettability between them is poor, which leads to the increase of internal defects in the coating and the decrease of coating quality

Method used

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  • Method for improving friction and wear performance of thermal-sprayed Al2O3 ceramic coating
  • Method for improving friction and wear performance of thermal-sprayed Al2O3 ceramic coating
  • Method for improving friction and wear performance of thermal-sprayed Al2O3 ceramic coating

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A: Use the atmospheric plasma spraying process to spray NiAl transition coating on the stainless steel substrate with a thickness of about 60 μm, and then spray to prepare Al 2 o 3 Ceramic coating, the coating thickness is 180~200μm.

[0022] B: Prepared Al 2 o 3 After the ceramic coating surface is polished and polished, the surface roughness of the ceramic coating R a ≈2.2 μm.

[0023] C: Weigh: Thiourea (CN 2 h 4 S) is 3.2g, sodium molybdate (Na 2 MoO 4 ) was 2.3g, and 100g of ionized water were mixed uniformly and fully dissolved, then poured into a reaction kettle with a volume of 200ml.

[0024] D: the Al prepared in step B 2 o 3 The ceramic coating sample is immersed in the solution prepared in step C in the reactor. After sealing the reactor, place the reactor in an oven. The oven is slowly heated to 220°C (heating rate: 2.5°C / min), and kept for 48 Hour.

[0025] E. After the heat preservation is over, when the temperature of the oven drops to room ...

Embodiment 2

[0028]A: Use the atmospheric plasma spraying process to spray NiCrAl transition coating on the stainless steel substrate with a thickness of about 70 μm, and then spray to prepare Al 2 o 3 Ceramic coating, the coating thickness is 160~180μm.

[0029] B: Prepared Al 2 o 3 After the ceramic coating surface is polished and polished, the surface roughness of the ceramic coating R a ≈2.0 μm.

[0030] C: Weigh: Thiourea (CN 2 h 4 S) is 3.5g, sodium molybdate (Na 2 MoO 4 ) was 2.5g, and 100g of ionized water were mixed uniformly and fully dissolved, then poured into a reaction kettle with a volume of 200ml.

[0031] D: the Al prepared in step B 2 o 3 The ceramic coating sample is immersed in the solution prepared in step C in the reaction kettle. After sealing the reaction kettle, place the reaction kettle in an oven. The oven is slowly heated to 220°C (heating rate: 2.5°C / min), and kept for 72 Hour.

[0032] E. After the heat preservation is over, when the temperature o...

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Abstract

The invention discloses a method for improving friction and wear performance of a thermal-sprayed Al2O3 ceramic coating. The method comprises steps as follows: a metal transition coating and an Al2O3 ceramic coating are sprayed onto a metal substrate sequentially with an atmospheric plasma spraying technology; the prepared Al2O3 ceramic coating surface is ground; powdery thiourea and powdery sodium molybdate are weighed, are placed in deionized water used as a solvent and are fully stirred to be completely dissolved, and an MoS2 solution is obtained; a ground Al2O3 ceramic coating sample is immersed in the MoS2 solution, the solution is sealed and then placed in a drying oven, the drying oven slowly heats the solution to 220 DEG C at the heating rate smaller than or equal to 3 DEG C/min, and the solution is kept at the temperature and placed for 48-72 h; and after the drying oven is cooled to the room temperature, the Al2O3 ceramic coating sample is taken out, and redundant MoS2 powder which is produced through a self-reaction on the surface of the sample is completely removed. The wear degree of the coating obtained with the method is greatly improved; and meanwhile, holes in the Al2O3 ceramic coating surface are effectively sealed through filling of the holes in the coating surface with the MoS2 powder.

Description

technical field [0001] The invention relates to an improved thermal spraying Al 2 o 3 The invention discloses a method for the friction and wear performance of ceramic coatings, which belongs to the technical field of coating surface modification. Background technique [0002] Preparation of Al on Metal Substrates by Atmospheric Plasma Spraying 2 o 3 Ceramic coating can significantly improve the protective performance of metal substrates, but due to the inherent characteristics of ceramic materials, its Al 2 o 3 The tribological properties of ceramic coatings have not been greatly improved, such as Al 2 o 3 The friction coefficient of the base coating at room temperature is about 0.5~0.6, and the wear amount is 10 -4 ~10 -5 μm / N·mm 3 between. In order to improve the friction and wear properties of thermal sprayed ceramic coatings, powders with lubricating properties, such as Ag, MoS 2 , BN, graphite, etc. Although the tribological properties of the obtained compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/18C23C18/12
CPCC23C4/18C23C18/1204
Inventor 安宇龙邓雯赵晓琴侯国梁周惠娣陈建敏
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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