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A method for coating boron carbide on diamond surface

A technology of diamond and boron carbide, which is applied in the field of boron carbide coating on the surface of diamond, to achieve the effect of improved erosion ability, complete shape and improved wear ratio

Inactive Publication Date: 2017-01-18
JILIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, this method is not suitable for making utensils with metal matrix wrapped diamond particles.

Method used

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Embodiment Construction

[0018] The 30-35 mesh diamond particles were ultrasonically cleaned with dilute nitric acid, acetone and alcohol for 10 minutes respectively. The cleaned diamond, boron powder (300 mesh, purity: 97%) and boric acid (purity: 99.99%) were ground with a mortar and mortar at a mass ratio of 1:1:1.6 for more than 1 hour. Use a high-temperature ceramic dry pot to hold the fully mixed raw materials and place them in a tube furnace. Turn on the mechanical pump to make the system vacuum less than 100 Pascals. The temperature in the furnace was raised to 300°C at a rate of 6°C / min and kept at 300°C for 30 minutes. The temperature in the furnace was further increased to 1200°C, and kept at 1200°C for 10 hours. The furnace temperature was lowered to room temperature while maintaining the system vacuum. Use a 40-mesh sub-sieve to separate the boron carbide-coated diamond particles from the remaining waste. Boil the separated boron carbide-coated diamond particles in dilute nitric acid ...

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Abstract

The invention discloses a method for plating boron carbide on a diamond surface. The method comprises the following steps: boriding on the diamond particle surface under the conditions that the vacuum degree is less than 100 Pascal, the temperature is preserved to 300 DEG C for 30 minutes and the temperature is preserved to 1200 DEG C for 3-12 hours, thereby plating a boron carbide film on the diamond surface. According to the diamond of which the surface is plated with the boron carbide film prepared by the invention, the binding force between a metal matrix and the diamond can be improved, the erosion resistance of the diamond to oxygen, iron, nickel and cobalt can be greatly improved, and the phenomena such as oxidation and graphitization of the diamond in the process of preparing a diamond-impregnated drill bit can be effectively avoided, so that the diamond inlaid into the metal matrix is complete in appearance, clear in edges and stable in performance. Therefore, the abrasive ratio of the manufactured appliances is greatly improved, and the service life is obviously prolonged.

Description

technical field [0001] The invention relates to a method for coating boron carbide on a diamond surface. Background technique [0002] Devices with diamond particles embedded in a metal matrix are widely used in fields such as industrial processing, site surveying, and oil exploration, such as grinding wheels and diamond-impregnated drill bits. The diamond particles that play the main cutting role in these appliances are usually embedded in the metal matrix with bronze as a binder, but the inherent physical properties of copper and diamond determine that the copper’s hold on the diamond particles is very weak. During the use of diamond tools, such as impregnated diamond drill bits, it can often be clearly observed that diamond particles fall from the carcass in advance without being worn, which seriously reduces the service life. At present, some patents have proposed the method of coating the diamond surface with a metal layer to improve the holding force of the metal matr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/50
Inventor 孟庆南孙友宏刘宝昌高科马银龙
Owner JILIN UNIV
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