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Method for preparing ultra nanometer diamond coating of ceramic valve core

A technology of diamond coating and ceramic valve core, applied in the direction of metal material coating process, coating, valve device, etc., can solve the problems of rising cost of domestic products, insufficient surface performance, insufficient wear resistance, etc., to improve performance and Good quality, good wear resistance and extended service life

Inactive Publication Date: 2012-07-25
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

[0023] Put the ceramic valve core of the flat faucet in 90°C 10mol / l nitric acid solution to etch for 12 hours, take it out and rinse it with water; then place it in an ethanol suspension with 0.5 μm diamond micropowder, and use an ultrasonic generator for ultrasonic grinding for 20 minutes; then use Clean the sample with ethanol solution, dry it, place it in the microwave plasma reaction chamber, vacuumize, turn on the microwave generator, control the gas flow rate to 500-800mL / min, and the working gas is CH 4 and Ar, CH 4 The concentration is 1% to 2%, and then the microwave power is increased to 1200W to 1300W, the gas pressure is maintained at 10000 to 13000Pa, the temperature of the ceramic valve core is 800 to 900°C, and maintained for 4 to 5 hours, and finally the microwave power is gradually reduced to slowly reduce the sample to room temperature.

Embodiment 2

[0025] Put the ceramic valve core of the flat faucet into the molten KOH inside the muffle furnace at 420°C to etch the surface for 5 minutes, take it out and rinse it with water; then place it in an ethanol suspension with 0.5 μm diamond micropowder, and use an ultrasonic generator for ultrasonic grinding 20min; then the sample was cleaned and dried with ethanol solution, and placed in a microwave plasma reaction chamber, the growth process of the ultra-nano-diamond coating was the same as in Example 1.

Embodiment 3

[0027] Carry out acid (or alkali) etching and ultrasonic grinding treatment (as described in Example 1 or Example 2) to the ceramic valve core of the flat faucet, place it in the microwave plasma reaction chamber, evacuate, turn on the microwave generator, The control gas flow rate is 500-800mL / min, and the working gas is CH 4 , Ar and H 2 mixture, CH 4 Concentration 1% ~ 2%, H 2 Concentration of 15% to 18%, then increase the microwave power to 1200W to 1300W, maintain the gas pressure at 10000 to 13000Pa, and maintain the temperature of the ceramic valve core at 700 to 800°C for 4 to 5 hours. Finally, gradually reduce the microwave power and slowly lower the sample to room temperature.

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PUM

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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 byover 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 preparation method for an ultranano-diamond coating that improves the overall performance of a ceramic valve core substrate. Background technique [0002] The ultra-nano-diamond coating refers to an adhesive diamond film with a grain size smaller than 40nm in the film layer. Compared with the traditional diamond film, its surface is smoother and smoother, and its hardness is basically close (up to 60GPa, while the traditional diamond film is about 80GPa), but the structure is different: it is sp 3 Hybridized carbon atoms make up the majority (sp 3 Hybridized carbon atoms greater than 75%), a carbon film with a grain size of less than 40nm in a film layer with a certain network structure. [0003] Ceramic valve core is a new high-tech product that uses engineering ceramic materials instead of traditional rubber and steel as seals. Due to the high s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C16/27C04B41/85F16K5/08
Inventor 王兵
Owner SOUTHWEAT UNIV OF SCI & TECH