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Manufacturing method of diamond compacts

A technology of diamond composite sheet and manufacturing method, which is applied in the field of metallurgy, and can solve problems such as increased energy consumption, high temperature, and restricted technical advantages

Active Publication Date: 2014-11-19
湖南泰鼎新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the cemented carbide purchased is already a formed product, the diamond composite sheet manufacturing company cannot arbitrarily change the technical conditions such as the grade, proportion, and particle thickness of the cemented carbide, which restricts the quality of the diamond composite sheet manufacturers in terms of product quality. technical advantages
[0003] In addition, it takes a lot of energy to obtain the alloy matrix by sintering and forming the alloy powder under high temperature and high pressure in advance, and the sintered alloy matrix and diamond single crystal need to be further sintered, because the alloy matrix has a high structural compactness. , the temperature for further sintering needs to be higher, further leading to an increase in energy consumption
And the high temperature of the sintering process will cause part of the diamond to convert into carbon, which will lead to a decrease in hardness. Not only that, but the high temperature will also lead to a decrease in yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Wc, Co, and Ni are mixed according to the mass ratio of 80:14:6, and then cold-pressed at normal temperature and pressure to obtain an alloy powder body that can be used for assembling with a diamond single crystal. After assembling the alloy powder body and the diamond single crystal, a pyrophyllite composite block is formed, and the composite block is placed in a six-sided top press for high temperature and high pressure sintering, the sintering pressure is 85Mpa, and the sintering temperature is 1150°C to obtain a diamond composite sheet. The impact strength and wear ratio of the prepared samples with different areas were tested, and the results showed that the average impact strength was about 200 joules, and the average wear ratio was about 700,000. It is suitable for drilling tools with a rock grade of 12 and a drilling depth of less than 2000 meters.

Embodiment 2

[0030] Wc, Co, Cu, and Fe are mixed according to the mass ratio of 75:16:6:3, and then cold-pressed to obtain an alloy powder body that can be used to assemble with a diamond single crystal. After assembling the alloy powder body and the diamond single crystal, a pyrophyllite synthetic block is formed, and the synthetic block is placed in a six-sided top press for high-temperature and high-pressure sintering at a sintering pressure of 90 MPa and a sintering temperature of 900 ° C to obtain a diamond composite sheet. The impact strength and wear ratio of the prepared samples with different areas were tested, and the results showed that the average impact strength was about 300 joules, and the average wear ratio was about 650,000. It is suitable for drilling tools with a rock grade of 12 gravel formations and quartz belt formations and a drilling depth of less than 3,000 meters.

Embodiment 3

[0032] Wc, Co, and Cu are mixed according to the mass ratio of 86:12:2, and then cold-pressed to obtain an alloy powder body that can be used for assembling with a diamond single crystal. After assembling the alloy powder body and diamond single crystal, a pyrophyllite synthetic block is formed, and the synthetic block is placed in a six-sided top press for high-temperature and high-pressure sintering with a sintering pressure of 95Mpa and a sintering temperature of 750°C. The impact strength and wear ratio of the prepared samples with different areas were tested, and the results showed that the average impact strength was about 200 joules, and the wear ratio was about 800,000. It is suitable for drilling tools with rock grades of grade 12 granite formations and deep sea formations, and drilling depths within 5,000 meters.

[0033] In the manufacturing cost, take the 1913 composite sheet as an example: the cemented carbide substrate is purchased at 480 yuan / kg, while the alloy...

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Abstract

The invention relates to a manufacturing method of diamond compacts. Specifically, metal powder needed for preparing a hard alloy matrix is mixed and formed in a cold pressing mode to obtain alloy powder, the alloy powder and diamond single crystals are assembled and sintered at the pressure of 80-100 MPa and the temperature of 650-1150 DEG C, and finally the diamond compacts can be obtained. According to the manufacturing method, the production cost can be saved by 10-20%, the energy consumption can be lowered, the manufacturing steps are simplified, and the rate of finished products is increased; the diamond compacts with the high impact strength and the good wear resistance are obtained; the prepared diamond compacts can serves as boring tools of the fields of petroleum, natural gas, shale gas, the geological engineering and the like.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a method for manufacturing a diamond composite sheet. Background technique [0002] In my country's superhard material industry, diamond (synthetic diamond or natural diamond) is usually used to synthesize diamond composite sheets at high temperature and high pressure with a cemented carbide substrate. The specific synthesis steps in the prior art are as follows: firstly purchase the cemented carbide substrate, which is obtained by sintering metal powder under high temperature and high pressure, and then assemble the cemented carbide substrate obtained by sintering with diamond single crystal, and then The diamond composite sheet is synthesized by high temperature and high pressure on the six-sided top press (two-sided top press). However, at present, all enterprises that produce diamond composite sheets purchase sintered and processed cemented carbide substrates from cemen...

Claims

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Application Information

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IPC IPC(8): B22F7/08
Inventor 蒋向上蒋孟瑶
Owner 湖南泰鼎新材料有限责任公司
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