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Preparation method of diamond compact

A technology of diamond composite sheet and diamond powder is applied in the field of hard material manufacturing, which can solve the problems of poor compactness and large residual stress of products, and achieve the effects of compact and uniform sintered structure, strong operability and good synthesis repeatability.

Inactive Publication Date: 2011-04-20
柳州市大荣非金属材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the patent of the present invention is to provide a method for preparing a diamond composite sheet. The problem to be solved by this method is that the sintered structure and compactness of the existing polycrystalline layer are poor, and the residual stress of the product is large.

Method used

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  • Preparation method of diamond compact
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Embodiment 1

[0014] A diamond powder layer 2 with a thickness H2 of 2 mm is placed between a metal alloy sheet 1 with a thickness H1 of 0.2 mm and a hard alloy substrate 3 with a thickness H3 of 3 mm to make a sintered compact, and then the sintered compact is placed in a graphite tube Heating and pressurizing sintering in the synthetic cavity, the pressurized pressure is 5.0GPa, the sintering temperature is 1500 ± 50°C, and the time is 3 minutes. After sintering, the temperature is lowered and the pressure is relieved to produce a diamond composite sheet. The residual stress is 280MPa after testing.

Embodiment 2

[0016] A diamond powder layer 2 with a thickness H2 of 0.3 mm is placed between a metal alloy sheet 1 with a thickness H1 of 0.05 mm and a hard alloy substrate 3 with a thickness H3 of 1 mm to make a sintered compact, and then the sintered compact is placed in a graphite tube Heating and pressurizing sintering in the synthetic cavity, the pressurized pressure is 5.0GPa, the sintering temperature is 1250 ± 50°C, and the time is 3 minutes. After sintering, the temperature is lowered and the pressure is relieved to produce a diamond composite sheet. The residual stress is 290MPa after testing.

Embodiment 3

[0018] A diamond powder layer 2 with a thickness H2 of 5 mm is placed between a metal alloy sheet 1 with a thickness H1 of 0.4 mm and a hard alloy substrate 3 with a thickness H3 of 10 mm to make a sintered compact, and then the sintered compact is placed in a graphite tube Heating and pressurizing sintering in the synthetic cavity, the pressurized pressure is 6.0GPa, the sintering temperature is 1450 ± 50°C, and the time is 30 minutes. After sintering, the temperature is lowered and the pressure is relieved to produce a diamond composite sheet. The residual stress is 98MPa after testing.

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Abstract

The invention discloses a preparation method of a diamond compact. The method comprises the following steps: arranging a diamond powder layer (2) between a metal alloy plate (1) and a hard alloy substrate (3) to prepare a sintered blank; then putting the sintered blank into the synthesis cavity of a graphite pipe, carrying out warming-pressurizing sintering for 3-30 minutes at 1200-1500 DEG C under the pressure of 5.0-6.0GPa; and cooling and depressurizing the sintered product, thus obtaining the diamond compact. By utilizing the method provided by the invention, the problems that the product prepared in the prior art has poor sintered histology compact uniformity and large residual stress are solved.

Description

technical field [0001] The invention relates to the technical field of hard material manufacture, in particular to a method for preparing a diamond composite sheet suitable for drilling and cutting tools. Background technique [0002] Polycrystalline diamond compact (PDC) is the growth of independent diamond particles relying on the growth and bonding between particles under high temperature and high pressure (HPHT) conditions, so that the entire diamond micropowder layer is sintered into a high-strength network structure. Type diamond polycrystal (D-D combination), and sintered and compounded with cemented carbide matrix to form an integrated composite material. The material has the wear resistance and strength of diamond and the toughness and weldability of cemented carbide matrix materials. It is an excellent cutting tool and wear-resistant material, and is widely used in machining tools, petroleum and geological drill bits, and grinding wheel dressing tools etc. [000...

Claims

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Application Information

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IPC IPC(8): B22F7/06
Inventor 贾晓鹏
Owner 柳州市大荣非金属材料有限公司
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