Diamond composite sheet matrix with carbon potential gradient

Abstract

The invention relates to a diamond composite sheet matrix with carbon potential gradient, the matrix is a dual-layer structure and comprises an upper part and a lower part connected with the upper part, the thickness of the upper part is 1-4mm, the thickness of the lower part is 4-20mm, and the upper part and the lower part comprise the following components by weight percent: 10%-18% of cobalt, and 82%-90% of tungsten carbide, wherein the carbon balance of the tungsten carbide of the upper part is lower than the carbon balance of the tungsten carbide of the lower part by 0.02-0.10%, and the upper part and the lower part constitute the carbon potential gradient. As the upper part of the matrix which is combined with diamond has lower carbon potential, the diamond composite sheet matrix canreduce or eliminate the carburization of the matrix caused by partial graphitization of the diamond on a diamond and hard alloy matrix composite interface; and the lower part of the matrix which is far away from the diamond, the diamond composite sheet matrix can ensure the toughness and the service life of the matrix.

Description

technical field [0001] The invention relates to a diamond composite sheet substrate, which is applied to cutting parts of petroleum, natural gas and geological drill bits. Background technique [0002] Diamond composite sheet is composed of polycrystalline diamond and cemented carbide matrix through ultra-high temperature and high pressure technology. It has high hardness and high wear resistance. Drill bits inlaid with diamond composite sheet have been widely used in petroleum, natural gas, mine geology and other fields. , The drilling efficiency is many times higher than ordinary drill bits. In the synthesis process of the composite sheet, carburization of the cemented carbide matrix near the diamond layer will often occur due to the graphitization of part of the diamond, and the comprehensive performance of the cemented carbide matrix with carburization will be significantly reduced, which will further affect To the performance and service life of the diamond composite s...

AI Technical Summary

Problems solved by technology

In the synthesis process of the composite sheet, carburization of the cemented carbide matrix near the diamond layer will often occur due to the graphitization of part of the diamond, and the comprehensive performance of the cemented carbide matrix with carburization will be significantly reduced, which will further affect To the performance and service life of the diamond compact

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