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Preparation method of coating containing TiB2 metal ceramic composite powder for thermal spraying piston ring

A metal-ceramic composite and composite powder technology, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problems of high brittleness, low density, small particle size, etc.

Inactive Publication Date: 2012-07-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the invention is aimed at existing pure TiB 2 Due to the small particle size, low density and high brittleness of powder materials, it is difficult to be directly used for thermal spraying to prepare coatings, and a TiB 2 Preparation method of agglomerated thermal spraying powder compounded with various metals or alloys, realizing the combination of various metals or alloys with TiB 2 Composite, and through the method of plasma spheroidization after heat treatment, the composite powder has good sphericity, high density, good fluidity, high bulk density, and uniform particle size distribution, which can be applied to thermal spraying and can increase TiB 2 Deposition Rate and Coating Abrasion Resistance

Method used

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  • Preparation method of coating containing TiB2 metal ceramic composite powder for thermal spraying piston ring
  • Preparation method of coating containing TiB2 metal ceramic composite powder for thermal spraying piston ring
  • Preparation method of coating containing TiB2 metal ceramic composite powder for thermal spraying piston ring

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Take TiB with a particle size of 1 to 3 microns 2 Add 128.1g of powder, 25.6g of NiCr powder with a particle size of 20 to 30 microns and 46.3g of Mo powder with a particle size of 1 to 2 microns into the ball mill tank, then add 250g of absolute ethanol for mixed ball milling for 15 hours, and put the wet-milled powder at 60°C Dry, sieve and disperse, add the mixed powder less than 3 microns into 300g deionized water, stir well and heat it with an electric furnace, add 0.4g ammonium citrate and 0.7g polyethylene glycol after heating to 80°C, and then keep At 80°C, continue stirring for 10 minutes, then add the dissolved PVA solution with a content of 3.2g, and finally adjust the pH value to 9.5 while maintaining the temperature at 80°C, and continue stirring for 60 minutes to obtain a TiB-containing solution. 2 Metal-ceramic composite powder slurry. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, the slurry is spray-dried and ...

Embodiment 2

[0028] Take TiB with a particle size of 1 to 3 microns 2Add 108.1g of powder, 35.6g of NiCr powder with a particle size of 20 to 30 microns and 56.3g of Mo powder with a particle size of 1 to 2 microns into the ball mill tank, then add 250g of absolute ethanol for mixed ball milling for 13 hours, and put the wet-milled powder at 60°C Dry, sieve and disperse, add the mixed powder less than 3 microns into 250g deionized water, stir well and heat with electric furnace, after heating to 80°C, add 0.2g ammonium citrate, 0.3g ammonium polyacrylate and 1g polyethylene glycol, Then, at a temperature of 75°C, continue stirring for 10 minutes, then add an aqueous solution with a dissolved PVA content of 2.6 g, and finally, at a temperature of 75°C, adjust the pH value to 10.3 and continue stirring for 60 minutes to obtain a TiB-containing solution. 2 Metal-ceramic composite powder slurry. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, the slur...

Embodiment 3

[0031] Take TiB with a particle size of 1 to 3 microns 2 Add 88.1g of powder, 45.6g of NiCr powder with a particle size of 20 to 30 microns and 66.3g of Mo powder with a particle size of 1 to 2 microns into the ball mill tank, then add 250g of absolute ethanol for mixed ball milling for 11 hours, and put the wet-milled powder at 60°C Dry, sieve and disperse, add the mixed powder less than 3 microns into 200g deionized water, stir well and heat it with an electric furnace, add 0.4g ammonium polyacrylate and 0.8g polyethylene glycol after heating to 80°C, and then keep At 85°C, continue stirring for 10 minutes, then add the dissolved PVA solution with a content of 2.2g, and finally adjust the pH value to 8.6 while maintaining the temperature at 85°C, and continue stirring for 60 minutes to obtain a TiB-containing solution. 2 Metal-ceramic composite powder slurry. If bubbles are generated, add n-butanol defoamer dropwise. After the slurry is prepared, the slurry is spray-dried ...

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Abstract

The invention relates to a preparation method of a coating containing TiB2 metal ceramic composite powder for a thermal spraying piston ring, belonging to the field of composite power body technology. The preparation method provided by the invention comprises the following steps: firstly, adopting a ball-milling method to perform mixing and wet grinding on 25-75wt.% TiB2 powder, 25-10wt.% NiCr alloy powder and 50-15wt.% Mo metal powder to obtain mixed powder with the particle size less than 3 micrometers; then mixing the mixed powder with adhesion agent PVA (Polyvinyl Alcohol), dispersing agent and deionized water in proportion in to slurry, performing atomization and granulation of the slurry at the drying temperature rang of 150-250 DEG C and under the atomizing disc frequency range of 140-190Hz through a spray drying device; and finally performing densification treatment on the powder through heat treatment technology and plasma balling technology. For the composite powder prepared by the preparation method of the invention, the particle size is uniformly distributed, the spherical degree, the densification degree and the mobility are good, the deposition efficiency of TiB2 can be improved, and the metal ceramic coating with good wear-resisting property can be prepared.

Description

technical field [0001] The invention relates to a TiB-containing compound for thermal spraying piston ring coating 2 The invention discloses a method for preparing metal-ceramic composite powder, which belongs to the technical field of composite powder. Background technique [0002] Metal-ceramic composite coating is a composite coating composed of high hardness, high wear resistance ceramic phase and high toughness metal matrix. This coating is widely used in automobiles (such as piston rings), aerospace (such as Aircraft landing gear), metallurgy (such as sinking rolls) and papermaking (such as corrugated rolls) in the manufacture and repair of industrial or civil components that have high requirements for surface wear resistance and toughness. Conventional cermet composite coating materials such as WC-Co, Cr 3 C 2 -NiCr, etc., has gradually dimmed its application prospects in the automotive and aerospace industries in recent years due to its high price and high density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F1/00C23C4/06
Inventor 栗卓新祝弘滨李辉
Owner BEIJING UNIV OF TECH
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