Method for preparing polycrystalline diamond sintered body by nano onion head-carbon high temperature and high pressure

A high-temperature, high-pressure, onion-head technology, which is applied in the field of manufacturing superhard polycrystalline diamond sintered bodies, can solve problems such as difficult industrialized production, and achieve the effects of smooth surface, reduced brittleness, and fine grains

Active Publication Date: 2011-12-14
ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former Soviet Union published a paper on the manufacture of polycrystalline diamond sintered body by graphite phase transition in 1967. Recently, scholars in Japan and the United States have successively applied for patents and published papers claiming to use graphite or nano-diamond to synthesize sintered polycrystalline diamond sintered body, but the used The pressure is higher than 10GPa, which is a relatively important achievement in theoretical research, but it is difficult to carry out industrial production under the conditions of real industrial equipment

Method used

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  • Method for preparing polycrystalline diamond sintered body by nano onion head-carbon high temperature and high pressure
  • Method for preparing polycrystalline diamond sintered body by nano onion head-carbon high temperature and high pressure
  • Method for preparing polycrystalline diamond sintered body by nano onion head-carbon high temperature and high pressure

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Accurately weigh the nano-onion-carbon 5, put it into a prefabricated mold, and prefabricate the sample at 60 MPa on an ordinary hydraulic press at room temperature; put the sample into the graphite tank 4 after demoulding, and mix with the pressure transmission medium pyrophyllite 2, graphite Sheet 3, conductive steel cap 1 form assembly block (see image 3 ), kept in a drying oven at 160°C for 6 hours. Take it out from the drying box and place it in the working part of the CS-1B six-sided press, which is produced by Guilin Metallurgical Machinery Factory; nominal pressure: (single cylinder) 8000KN.

[0019] After the six-sided top press is started, first raise the pressure to 4.5GPa, heat while maintaining the pressure, keep it at 500-550°C for 60s, then raise the temperature to 1200-1250°C, keep it at this temperature for 180s, and then stop heating , when the temperature drops below 100°C, the pressure is slowly released, the composite block is taken out, the press...

Embodiment 2

[0021] After the same pre-processing method as in Example 1, the assembled block is placed on the working surface of the six-sided top press, the press is started, the pressure is raised to 5.2-5.5GPa, maintained under this pressure, and the temperature is raised to 500- 550°C, hold for 60s, then rise to 1500-1550°C, hold for 120s; remove the pressure, cool down, take out the assembly block and post-treatment are the same as in Example 1 to obtain a φ6×5mm polycrystalline diamond sintered body, the average Vickers hardness test The hardness is 60.8GPa, and the grain size is 14.4nm;

[0022] The present invention uses nano-onion-carbon as the only raw material, and adds any other additives such as binders or reaction sintering catalyst materials, and its sintering temperature and pressure are significantly lower than those of similar products that use diamond particles as raw materials without additives (Kenichi K, Staom K, ctal. J. Am. Ccram. Soc, 1996(1). P97). The polycryst...

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Abstract

The invention relates to a method for preparing a polycrystalline diamond sintered body at high temperature and high pressure with nano-onion-carbon. The method uses nano-onion-carbon as a raw material without any additives, and prepares a diamond polycrystalline sintered body through high temperature and high pressure. The manufacturing method is as follows: the pre-prepared nano-onion-carbon powder is filled in a graphite mold, and mixed with The pressure transmission medium is assembled and placed on the working surface of the high-temperature and high-pressure equipment, the pressure is raised to the required pressure (2-6GPa) and maintained, and then heated to the required temperature (1000-1600°C) with electricity, after 1-6 minutes of heat preservation, slowly Cool the sample to below 100°C, then slowly release the pressure to normal pressure, and finally take out the diamond polycrystalline sintered body. Its sintering temperature and pressure are significantly lower than those of similar products without additives, which use diamond particles as raw materials, so that it has high toughness.

Description

technical field [0001] The invention belongs to a method for manufacturing a superhard material polycrystalline diamond sintered body. Background technique [0002] The manufacturing method of polycrystalline diamond sintered bodies commonly used in traditional industries is manufactured under high temperature-ultrahigh pressure conditions (generally 1400-1650℃+5-7GPa), and diamond particles are the main raw materials (about 70- 90%), others are a variety of additives that act as binders or catalysts, as binder materials, such as: Co, Ni, Si, B, Ti, Cr, Mn, etc. and their compounds. As a catalyst material, such as: Co, Ni, etc. The common feature of this type of polycrystalline diamond sintered body is to take diamond as the main raw material, cooperate with binder or catalyst or both materials (edited by Guo Zhimeng, Superhard Materials and Tools, Beijing, Metallurgical Industry Press, 1996.12 , P168-180). There are many patents on the manufacturing method of this type o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/06
Inventor 王明智邹芹赵玉成
Owner ZHENGZHOU RES INST FOR ABRASIVES & GRINDING CO LTD
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