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Diamond compact substrate

A technology of diamond composite sheet and matrix, applied in drilling equipment, earthwork drilling, drill bits, etc., can solve the problems of poor toughness, poor thermal stability and wear resistance, etc.

Active Publication Date: 2010-10-06
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Problems solved by technology

In the process of synthesis and application of the composite sheet, the composite sheet synthesized by single use of cemented carbide matrix with low cobalt content and fine grain has good thermal stability and wear resistance, but poor toughness; The composite sheet synthesized by cemented carbide matrix with high content and coarse grain has good toughness, but poor thermal stability and wear resistance

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Embodiment Construction

[0020] The present invention designs a cemented carbide substrate with both cobalt content gradient and particle size gradient, and the embedded combination of the substrate part, so as to ensure that the composite sheet has high thermal stability, wear resistance and toughness.

[0021] Such as Figure 1~3 As shown, the matrix of the diamond composite sheet has a double-layer structure, including the upper part 1 and the lower part 3 connected thereto.

[0022] Wherein, the composition mass percentage of the upper part 1 is: 8%-15% of cobalt, 85%-92% of tungsten carbide; the grain size of tungsten carbide is 0.5-3 μm. The mass percentages of components in the lower part 3 are: 12%-20% cobalt, 80%-88% tungsten carbide; the grain size of tungsten carbide is 2-10 μm. The diameter D of the upper part 1 and the lower part 3 of the base body is φ9-25 mm, the height H1 of the upper part is 2-5 mm, and the height H2 of the lower part is 5-15 mm. The circular wave grooves 2 are dist...

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Abstract

The invention provides a diamond compact substrate with two-layer structure. The substrate comprises an upper part and a lower part connected with the upper part, wherein the junction surfaces of the upper part and the lower part are embedded with each other and have round wave channel structure; the upper part comprises the following components by weight percent: 8-15% of cobalt and 85%-92% of tungsten carbide, wherein the grain size of tungsten carbide is 0.5-3mu m; the lower part comprises the following components by weight percent: 12-20% of cobalt and 80%-88% of tungsten carbide, wherein the grain size of tungsten carbide is 2-10mu m. As the upper part combined with diamond of the substrate has finer grains and lower cobalt content, the thermal stability and wear resistance of the compact can be further increased; as the upper part far from the diamond layer of the substrate has rougher grain and higher cobalt content, the toughness and service life of the compact can be increased; and as the round wave channel structure is adopted between the two substrates, the bonding strength of the two substrates is remarkably improved.

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 that of ordinary drill bits. In the process of synthesis and application of the composite sheet, the composite sheet synthesized by single use of cemented carbide matrix with low cobalt content and fine grain has good thermal stability and wear resistance, but poor toughness; The composite sheet synthesized by the cemented carbide matrix with high content and coarse grain has good toughness, but poor ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B10/46B32B9/00
Inventor 廖江雄余立新陆庆忠
Owner SHAREATE TOOLS
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