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Method for preparing ultra nanometer diamond coating of ceramic valve core

A technology of diamond coating and ceramic valve core, which is applied in the direction of valve devices, mechanical equipment, cocks including cutting devices, etc., can solve the problems of rising cost, insufficient surface performance, and insufficient wear resistance of domestic products, and achieve low cost, Good wear resistance and extended service life

Inactive Publication Date: 2010-09-15
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another way is to introduce a large number of foreign advanced equipment to manufacture high-performance products. This requires a large amount of financial support and is also restricted by technical barriers. Even if it can be solved, the cost of domestic products will rise sharply and the competitiveness will be weakened.
Considering that the problems of the domestic ceramic valve core are mainly due to the insufficient surface properties of the material (insufficient hardness, wear resistance, and large roughness)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put the ceramic valve core of the flat faucet into 90 ℃ 10mol / l nitric acid solution for 12h etching, take it out and rinse it with water; then put it in the ethanol suspension with 0.5μm diamond fine powder, and ultrasonically grind it with an ultrasonic generator for 20min; then use Clean the sample with ethanol solution, dry it, place it in the microwave plasma reaction chamber, evacuate, turn on the microwave generator, control the gas flow to 500-800mL / min, and the working gas is CH 4 and Ar, CH 4 Concentration of 1%~2%, then increase the microwave power to 1200W~1300W, keep the gas pressure at 10000~13000Pa, the ceramic valve core temperature at 800~900℃, and maintain it for 4~5h, and finally gradually reduce the microwave power and slowly reduce the sample to room temperature.

Embodiment 2

[0026] Put the ceramic valve core of the flat faucet into the molten KOH in the 420 °C muffle furnace for 5 minutes to etch the surface, take it out and rinse it with water; then put it in the ethanol suspension with 0.5 μm diamond powder, and ultrasonically grind it with an ultrasonic generator. 20min; then the sample was cleaned with ethanol solution, blown dry, and placed in the microwave plasma reaction chamber.

Embodiment 3

[0028] The flat faucet ceramic valve core is etched with acid (or alkali) and ultrasonically ground (as described in Example 1 or Example 2), placed in a microwave plasma reaction chamber, evacuated, and a microwave generator turned on, The control gas flow is 500~800mL / min, and the working gas is CH 4 , Ar and H 2 gas mixture, CH 4 Concentration 1%~2%, H 2 The concentration is 15%~18%, then the microwave power is increased to 1200W~1300W, the gas pressure is maintained at 10000~13000Pa, the temperature of the ceramic valve core is 700~800℃, and maintained for 4~5h, and finally the microwave power is gradually reduced. Slowly reduce the sample to room temperature.

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Abstract

The invention belongs to a method for surface modification of a ceramic valve core, and particularly relates to a method for preparing an ultra nanometer diamond coating, which can improve the overall performance of a ceramic valve core matrix. The method comprises the following steps of: soaking the planar tap ceramic valve core in soaking solution; grinding the surface of the matrix by using diamond micropower suspension; and placing the ceramic valve core in a microwave plasma reaction cavity for growing the ultra nanometer diamond coating. The ultra nanometer diamond coating generated by the method has the advantages of high wear resistance and hardness, small frictional coefficient and thermal expansion coefficient, high self-lubrication, high chemical stability, no toxin and harmlessness and high hydrophobicity; and the ultra nanometer diamond coating can also improve the overall performance of the tap using the ceramic valve core, and the service life of the tap is prolonged by over 10 times. The tap and the oil-gas valve can be used in various mediums for a long time, are always kept tightly sealed and eliminate leakage, and are switched flexibly and light.

Description

technical field [0001] The invention belongs to a method for modifying the surface of a ceramic valve core, in particular to a method for preparing a super nano-diamond coating for improving the overall performance of a ceramic valve core substrate. Background technique [0002] Ultra-nano-diamond coating refers to an adhesive diamond film with a grain size of less than 40 nm in the coating. Compared with the traditional diamond film, its surface is smoother and smoother, and the hardness is basically close (up to 60GPa, while the traditional diamond film is about 80GPa), but the structure is different: it is based on sp 3 Hybridized carbon atoms account for the majority (sp 3 Hybrid carbon atoms are greater than 75%), and the grain size in the film layer with a certain network structure is less than 40nm. [0003] Ceramic valve core is a new high-tech product that uses engineering ceramic materials to replace traditional rubber and steel as seals. Due to the high strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/85F16K5/08
Inventor 王兵
Owner SOUTHWEAT UNIV OF SCI & TECH
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