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Hard alloy matrix and polycrystalline diamond composite sheet

A cemented carbide substrate and polycrystalline diamond technology, applied in metal processing equipment, turning equipment, drilling/drilling equipment, etc., can solve problems such as poor impact resistance, increased cost, and insufficient bonding force

Inactive Publication Date: 2016-01-06
HENAN JINGRUI SUPERHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polycrystalline diamond compact is sintered and compounded by fine-grained diamond and cemented carbide matrix, but due to the large differences between diamond and cemented carbide matrix in terms of strength, hardness, thermal expansion coefficient, elastic modulus and structure, etc. The difference, in the high temperature and high pressure sintering process, the bonding force between the polycrystalline diamond layer and the cemented carbide substrate interface is insufficient, which leads to the deterioration of the impact resistance of PDC, so that the polycrystalline diamond layer falls off prematurely or occurs during the application process. Abnormal fractures seriously affect the quality of polycrystalline diamond compacts and increase costs, limiting their scope of use

Method used

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  • Hard alloy matrix and polycrystalline diamond composite sheet
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] First, prepare the cemented carbide for the polycrystalline diamond composite sheet, which is in the shape of a cylinder. The interface between the cemented carbide substrate and the diamond layer is a frustum-shaped overall, and the diameter difference between the upper and lower bottom surfaces of the frustum is 1 mm, and the busbar of the frustum and the bottom surface are 1 mm apart. The included angle of the lower bottom surface is 20°. The center of the circular platform is designed as a convex hemisphere, and the concave hemisphere is circumscribed with the convex hemisphere as the center, and the convex or concave hemispheres are uniformly arranged in a regular hexagonal radial shape, and the top view and cross-sectional structure schematic diagram are respectively as follows figure 1 and figure 2 shown.

[0053] Secondly, the diamond micropowder with different particle sizes is mixed and purified, and then the processed diamond micropowder and the above-menti...

Embodiment 2

[0056] First, prepare the cemented carbide for the polycrystalline diamond composite sheet, which is in the shape of a cylinder. The interface between the cemented carbide substrate and the diamond layer is generally in the shape of a truncated cone. The included angle of the lower bottom surface is 30°. The center of the circular platform is designed as a convex hemisphere, and the concave hemisphere is circumscribed with the convex hemisphere as the center, and the convex or concave hemispheres are evenly and alternately arranged radially in the shape of a regular hexagon.

[0057] Secondly, the diamond micropowder with different particle sizes is mixed and purified, and then the processed diamond micropowder and the above-mentioned cemented carbide substrate are placed in a metal cup to obtain a combined inner core. Put the prepared combined inner core, salt tube, magnesium tube, carbon tube and other auxiliary parts into special pyrophyllite blocks to make synthetic blocks...

Embodiment 3

[0060] First, prepare the cemented carbide for the polycrystalline diamond composite sheet, which is in the shape of a cylinder. The interface between the cemented carbide substrate and the diamond layer is generally a frustum of a cone. The angle with the bottom surface is 35°. The center of the circular platform is designed as a concave hemisphere, and the convex hemisphere is circumscribed with the concave hemisphere as the center, and the convex or concave hemispheres are evenly and alternately arranged radially in the shape of a regular hexagon.

[0061] Secondly, the diamond micropowder with different particle sizes is mixed and purified, and then the processed diamond micropowder and the above-mentioned cemented carbide substrate are placed in a metal cup to obtain a combined inner core. Put the prepared combined inner core, salt tube, magnesium tube, carbon tube and other auxiliary parts into special pyrophyllite blocks to make synthetic blocks. The polycrystalline di...

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Abstract

The invention provides a hard alloy matrix for a polycrystalline diamond composite sheet. A plurality of evenly-arranged protrusions and a plurality of depressions are arranged on the combination interface of the hard alloy matrix and a diamond layer. Optimized design is carried out on the combination interface of the hard alloy matrix and the diamond layer, the thermal residual stress between the combination face is reduced, and therefore the impact toughness of polycrystalline diamond is improved, and the quality of the polycrystalline diamond is improved.

Description

technical field [0001] The invention belongs to the technical field of production of superhard material polycrystalline diamond composite sheets, and in particular relates to a cemented carbide matrix and polycrystalline diamond composite sheets. Background technique [0002] Superhard materials mainly refer to diamond, which is currently known as the hardest substance in the world, and its hardness is much higher than that of hard tools such as corundum, silicon carbide, and tool materials such as cemented carbide and high-speed steel. Therefore, superhard materials are suitable for making tools for processing other materials, especially in processing hard materials, which have incomparable advantages and occupy an irreplaceable important position. Therefore, superhard materials have been widely used in industry. However, diamonds are scarce and expensive, which is far from meeting the needs of economic development. Therefore, researchers synthesized polycrystalline diamon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23B27/20B23B27/08
CPCB23B27/20B23B27/08B23B2222/28B23B2226/315
Inventor 刘会娟王晓李治海王恒朋
Owner HENAN JINGRUI SUPERHARD MATERIAL
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