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Method for coating chromium carbide on diamond micro powder surface

A diamond micropowder and diamond technology, which is applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult settlement and separation, expensive equipment, high production cost, etc., and achieve the effect of reducing the generation temperature and high plating efficiency

Active Publication Date: 2017-07-07
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are certain defects in the prior art. The vacuum physical vapor deposition method is difficult to coat the granular powder evenly, and it is easy to miss plating and the coating amount is small, the equipment is expensive, and the production cost is high; the salt bath plating reaction temperature is higher. Heat damage and post-plating separation process is complicated and production costs are high; the disadvantages of powder-covered sintering plating are similar to those of salt bath plating; chemical plating and electroplating have serious environmental pollution, and fine-grained diamond powder has ultra-fine size, large surface area, non-conductive, and difficult to disperse , Difficult to settle and separate, easy to cause adhesion between the coatings in the process of electroless plating and electroplating, and many diamonds are coated with a piece of metal, making separation difficult
Although vacuum micro-evaporation plating can be coated on the surface of diamond at a relatively low temperature, it needs to use activated high-purity metal powder, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] a. Put 2g of M4 / 8 diamond micropowder into 50ml of 30% sodium hydroxide and cook for 20 minutes, then wash it, then add it to 50ml of 30% nitric acid solution, cook for 30 minutes, wash it, put 50ml of mass fraction is 25% chromic acid washing solution soaked for 20 minutes and then washed;

[0024] b. Add 2g of ammonium dichromate and 0.5g of fluorite to 50ml of water and stir to dissolve. After obtaining the solution, add the diamond powder treated in step a, stir evenly and put it in an oven at 220°C for 2 hours to obtain the precursor powder;

[0025] c. Place the precursor powder obtained in step b in a corundum crucible, put the corundum crucible with the precursor powder into a high-temperature microwave oven, and replace the cavity of the high-temperature microwave oven with argon to fill it with argon, and then the flow rate is about 0.7 Under the flowing argon atmosphere of L / min, heat to 800°C and hold for 60 minutes, then cool to room temperature with the fu...

Embodiment 2

[0028] a. Put 4g of M5 / 10 diamond micropowder into 100ml of 30% sodium hydroxide and cook for 20 minutes, then add it to 100ml of 30% nitric acid solution and cook for 30 minutes, then put it in 50ml of mass fraction is 25% chromic acid washing solution soaked for 20 minutes and then washed;

[0029] b. Add 6g of ammonium dichromate, 2g of fluorite and 8g of sodium chloride into 100ml of water and stir to dissolve. After obtaining the solution, add the diamond powder treated in step a. Stir evenly and put it in an oven at 200°C for 3 hours to obtain a precursor powder ;

[0030] c. Place the precursor powder obtained in step b in a corundum crucible, put the corundum crucible with the precursor powder into a high-temperature microwave oven, and replace the cavity of the high-temperature microwave oven with argon to fill it with argon, and then the flow rate is about 0.7 Under the flowing argon atmosphere of L / min, heat to 850°C and hold for 60 minutes, then cool to room tempe...

Embodiment 3

[0033] a. Put 4g of M5 / 10 diamond micropowder into 100ml of 30% sodium hydroxide and cook for 20 minutes, then add it to 100ml of 30% nitric acid solution and cook for 30 minutes, then put it in 50ml of mass fraction is 25% chromic acid washing solution soaked for 20 minutes and then washed;

[0034] b. Add 6g of ammonium dichromate into 100ml of water and stir to dissolve. After obtaining the solution, add the diamond micropowder treated in step a, stir evenly, put it in an oven and keep it warm at 200°C for 2.5h to obtain the precursor powder;

[0035] c. Place the precursor powder obtained in step b in a corundum crucible, put the corundum crucible with the precursor powder into a high-temperature microwave oven, and replace the cavity of the high-temperature microwave oven with argon to fill it with argon, and then the flow rate is about 0.7 Under the flowing argon atmosphere of L / min, heat to 800°C and hold for 60 minutes, then cool to room temperature with the furnace; ...

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Abstract

The invention discloses a method for coating chromium carbide on a diamond micro powder surface, and belongs to the field of diamond surface treatment. The method comprises the following main steps of: putting pretreated diamond micro powder into a chromium ammonium salt containing solution to uniformly stir, heating to prepare a precursor, and putting the precursor into a microwave oven; performing heating and plating under flowing protective atmosphere; and finally, performing cleaning treatment, thereby obtaining diamond micro powder coated with chromium carbide on surface. According to the method disclosed by the invention, operations are simple, raw materials are cheap and easily available, coating efficiency is high, cost is high, and relatively high binding force is provided between the coating and diamond.

Description

technical field [0001] The patent of the present invention relates to the technical field of diamond surface treatment, in particular to a method for plating chromium carbide on the surface of diamond micropowder. Background technique [0002] Diamond powder with ultra-hardness and ultra-high thermal conductivity is an ideal material for precision machining of hard and brittle materials, enhanced wear resistance of composite coatings, and enhanced thermal conductivity of electronic packaging. However, due to the characteristics of non-conductive diamond, non-wetting with most metals, oxidation or graphitization at high temperature, lipophilic and hydrophobic, and poor dispersion in solution, it is difficult for diamond powder to be sanded quickly and evenly in the process of product manufacturing. The combination with the binder is not strong enough, and the interface with the substrate has a large thermal resistance. These problems need to be solved urgently in the applicat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
CPCB22F1/145
Inventor 窦志强肖长江栗正新赵志伟栗晓龙王丽晶
Owner HENAN UNIVERSITY OF TECHNOLOGY
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