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Method for preparing diamond sintered body by using discharge plasmas in sintering mode

A discharge plasma and diamond technology, applied in the field of material preparation, can solve problems such as diamond graphitization, and achieve the effects of short sintering time, fine grain size and low energy consumption

Inactive Publication Date: 2013-05-29
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the SPS method is sintering under normal pressure, and there is a problem of diamond graphitization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take 0.58g of 500-mesh silicon powder, 0.58g of 500-mesh titanium powder, and 0.78g of W30 diamond, put them into a steel ball mill jar, and then put 3.88g of corundum balls with a diameter of 18mm. After sealing, open the vacuum valve and vacuum for 0.5 hours , then put the ball milling jar into the planetary ball mill, the rotating speed is 300r / min, and the inverted frequency is 30Hz. After continuous ball milling for 30 minutes, the ball milling jar is removed, cooled, and the mixture is taken out; the above mixture is put into the SPS sintered mold, and the 50MPa, 1650℃, SPS sintering for 10min. There is no graphite in the sintered body, and the strength is 440MPa.

Embodiment 2

[0021] Take 0.71g of 1000-mesh silicon powder, 0.79g of 1000-mesh titanium powder, and 1g of W10 diamond, put them into a steel ball mill jar, and then put 5g of corundum balls with a diameter of 18mm. After sealing, open the vacuum valve to evacuate for 0.5 hours, and then Put the ball mill jar into a planetary ball mill with a rotating speed of 300r / min and an inverted frequency of 30Hz. After continuous ball milling for 30 minutes, remove the ball mill jar, cool it, and take out the mixture; 1350°C, SPS sintering for 5min. There is no graphite in the sintered body, and the strength is 275MPa.

Embodiment 3

[0023] Take 0.78g of 400-mesh silicon powder, 0.22g of 400-mesh titanium powder, and 1g of W40 diamond, put them into a steel ball mill jar, and then put 4g of corundum balls with a diameter of 18mm. After sealing, open the vacuum valve to evacuate for 0.5 hours, and then Put the ball milling jar into a planetary ball mill with a rotating speed of 300r / min and an inverted frequency of 30Hz. After continuous ball milling for 30 minutes, remove the ball milling jar, cool it, and take out the mixture; 1100°C, SPS sintering for 20min. There is no graphite in the sintered body, and the strength is 200MPa.

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Abstract

The invention discloses a method for preparing a diamond sintered body by using discharge plasmas in a sintering mode. The mass ratio of the total mass of silicon powder and titanium powder to the diamond is (1-1.5):1; the mass ratio of the silicon powder to the titanium powder is (0.9-3.5):1; the method comprises the following steps of: putting the raw materials into a steel ball-milling tank; further putting a corundum milling ball of 18mm in diameter into the steel ball-milling tank, wherein the ratio of the ball material to the raw materials is 2:1; sealing up the steel ball-milling tank and opening a vacuum valve so as to vacuum the steel ball-milling tank; putting the ball-milling tank into a planet type ball mill, wherein the rotation speed of the planet type ball mill is 300r / min and the inverse frequency is 30Hz; continuously ball-milling for 30minutes, subsequently taking down the ball-milling tank and cooling down; and carrying out SPS sintering on the mixture under 10-100MPa at 1,100-1,650 DEF C for 5-20minutes so as to obtain the diamond sintered body. The method is simple in process, short in sintering time and low in energy consumption; the sintered diamond sintered body is fine in crystal grain and uniform in structure, the bending strength is improved to 200-440MPa, and the compactness is increased to 80-98%.

Description

technical field [0001] The invention relates to a method for preparing a material, in particular to a method for preparing diamond. Background technique [0002] Diamonds are divided into two categories: natural diamonds and artificial diamonds. Natural diamond is a mineral composed of carbon elements formed under natural conditions. Artificial diamond is a diamond formed by artificially transforming non-diamond-structured graphite or gas-phase carbon atoms. Usually diamond is the hardest substance in nature, with a Mohs hardness of 10 and a Vickers hardness higher than 98GPa. Its grinding ability and wear resistance exceed all grinding materials, so it has many important industrial uses, such as Fine grinding materials, high-hard cutting tools, various drill bits, wire drawing dies, are also used as parts of many precision instruments. [0003] Usually, diamond polycrystals are sintered under high temperature and high pressure conditions. Under non-high-pressure sinterin...

Claims

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Application Information

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IPC IPC(8): C01B31/06C04B35/52C22C26/00
Inventor 王艳辉臧建兵周小琳
Owner YANSHAN UNIV
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