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TiO2-CNTs nano-composite powder for thermal spraying and preparing method for coating of TiO2-CNTs nano-composite powder

A technology of thermal spraying and coating, which is applied in the direction of coating, metal material coating process, molten spraying, etc., can solve the problems of high brittleness, coating hardness, poor fracture toughness and elastic modulus, etc., and achieve low Friction coefficient, excellent tribological properties, high wear resistance effects

Active Publication Date: 2016-06-29
ACADEMY OF ARMORED FORCES ENG PLA
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Problems solved by technology

However, compared with other ceramic coatings such as alumina, TiO 2 The hardness, fracture toughness and elastic modulus of the coating are poor, and the brittleness is relatively high

Method used

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  • TiO2-CNTs nano-composite powder for thermal spraying and preparing method for coating of TiO2-CNTs nano-composite powder
  • TiO2-CNTs nano-composite powder for thermal spraying and preparing method for coating of TiO2-CNTs nano-composite powder
  • TiO2-CNTs nano-composite powder for thermal spraying and preparing method for coating of TiO2-CNTs nano-composite powder

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Experimental program
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Embodiment Construction

[0028] 1 Preparation of TiO by Ultrasonic Dispersion and Spray Drying 2 -CNTs nanocomposite powder

[0029] Nano-TiO 2 The average particle size of the multi-walled CNTs (MWCNTs) is 60nm, the tube diameter is 40-60nm, and the length is less than 2μm (such as figure 1 ).

[0030] Preparation of slurry by ultrasonic dispersion technology:

[0031] (1) Doping and mixing nano-titanium oxide powder and MWCNTs according to a weight percentage of 97wt.%, 3wt.%, to obtain a mixed powder of the two substances;

[0032] (2) stirring the mixed powder, deionized water and binder PVA (polyvinyl alcohol) according to the weight percentages of 30wt.%, 68.5wt.% and 1.5wt.% respectively to make a slurry;

[0033] (3) In order to ensure the uniform dispersion of CNTs in the slurry, the slurry was placed in an ultrasonic reactor. Continuous ultrasonic dispersion for 3 hours, frequency 45Hz, temperature 50℃;

[0034] (4) During the ultrasonic dispersion process, in order to further reduce t...

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Abstract

The invention discloses TiO2-CNTs nano-composite powder for thermal spraying and a preparing method for a coating of the TiO2-CNTs nano-composite powder and belongs to the field of thermal spraying. In order to overcome the defects of a traditional TiO2 thermal spraying coating, a brand new thermal spraying powder system and a coating system-TiO2-CNTs nano-composite powder and a plasma spraying layer of the TiO2-CNTs nano-composite powder are prepared based on the good anti-friction and wear-resistance performance of CNTs; and finally, the friction coefficients and the abrasion amounts of a TiO2-3 wt% CNTs nano-composite coating (a TiO2-CNTs coating for short) and a TiO2 composite coating (a TiO2-Al2O3 coating for short) intensified by introducing 12 wt% of a Al2O3 second phase are compared through a friction and abrasion test, and it is proved that the novel coating has the more excellent tribology performance.

Description

technical field [0001] A kind of TiO for thermal spraying 2 -The preparation method of CNTs nanocomposite powder and coating thereof, belonging to the field of thermal spraying. Background technique [0002] Plasma spraying technology has many advantages such as high heat source temperature, various types of sprayable materials, fast jet velocity, high deposition efficiency and small thermal impact on the workpiece. The ceramic coating prepared by it has excellent properties such as wear resistance, high temperature resistance, corrosion resistance, and oxidation resistance. It has a wide range of applications in the manufacture and repair of hundreds of parts in the fields of aerospace, equipment remanufacturing, light industry, and automobile industry. application. Among them, TiO 2 The coating has moderate hardness, good wear resistance and corrosion resistance, and is often used to protect the surface of mechanical parts under medium loads, such as bearing sleeves, pu...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/11C01B31/02C01G23/047
CPCC01G23/047
Inventor 王海斗马国政何鹏飞陈书赢王海军刘明
Owner ACADEMY OF ARMORED FORCES ENG PLA
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