Polycrystalline diamond sintering body of selenium catalyst and preparation method thereof

A polycrystalline diamond and sintered body technology is applied in the field of superhard materials, which can solve the problems of increased cost and complicated process flow, and achieve the effects of improving hardness, good oxidation resistance and simplifying production process flow.

Active Publication Date: 2018-09-28
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0003] The traditional polycrystalline diamond sintered bodies are mostly sintered by diamond particles and metal catalysts under hig...

Method used

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  • Polycrystalline diamond sintering body of selenium catalyst and preparation method thereof
  • Polycrystalline diamond sintering body of selenium catalyst and preparation method thereof

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preparation example Construction

[0022] A preparation method of a polycrystalline diamond sintered body of a selenium catalyst, comprising:

[0023] The mixed powder composed of 31.59-34.047 parts by weight of micron-sized diamond powder and 1.473-4.79 parts by weight of micron-sized selenium powder is ground until the selenium powder becomes amorphous selenium powder.

[0024] In this embodiment, the diamond powder and the selenium powder are mainly mixed by ball milling, and the mixed powder after ball milling is subjected to X-ray diffraction analysis to confirm whether the selenium powder has been ball milled into amorphous amorphous selenium.

[0025] Further, in some embodiments, the weight percentage of the selenium powder is 4.2%-13.2%. In some embodiments, the weight percentage of the selenium powder is 4.2%-6.7%. It should be noted here that the percentage by weight of the selenium powder refers to the percentage of the weight of the selenium powder to the total amount of the selenium powder and th...

Embodiment 1

[0035] This embodiment provides a method for preparing a polycrystalline diamond sintered body of a selenium catalyst, comprising:

[0036] Weighing crystal grain is 3.159g of diamond powder of 2~5 μm and grain is 0.479g of selenium powder of 10~30 μm, wherein, the percentage by weight of diamond powder is 86.8%, and the percentage by weight of selenium powder is 13.2%;

[0037] Mix the above-mentioned diamond powder and selenium powder to obtain a mixed powder, put the mixed powder into a tungsten carbide bottle equipped with tungsten carbide balls, and then put the tungsten carbide bottle into a CERTIPREP SPEX8000-D high-energy ball mill (Metuchen, NJ). deal with. Among them, the ball mill is located in a sealed glove box purged with argon. The ball milling of the mixed powder needs at least 10 hours until the selenium powder is all ball-milled into amorphous amorphous selenium, and the mixed powder after ball milling is subjected to X-ray diffraction analysis to determine ...

Embodiment 2

[0041] This embodiment provides a method for preparing a polycrystalline diamond sintered body of a selenium catalyst, comprising:

[0042] Weighing 3.404g of diamond powder with grain size of 2 to 5 μm and 0.147g of selenium powder with grain size of 10 to 30 μm, wherein the weight percentage of diamond powder is 95.8%, and the weight percentage of selenium powder is 4.2%;

[0043]Mix the above-mentioned diamond powder and selenium powder to obtain a mixed powder, put the mixed powder into a tungsten carbide bottle equipped with tungsten carbide balls, and then put the tungsten carbide bottle into a CERTIPREP SPEX8000-D high-energy ball mill (Metuchen, NJ). deal with. Among them, the ball mill is located in a sealed glove box purged with argon. The ball milling of the mixed powder needs at least 10 hours until the selenium powder is all ball-milled into amorphous amorphous selenium, and the mixed powder after ball milling is subjected to X-ray diffraction analysis to determi...

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Abstract

A polycrystalline diamond sintering body of selenium catalyst and a preparation method thereof relates to the technical field of ultra-hard materials. The preparation method includes the steps of: mixing 31.59-34.047 weight parts of micron diamond powder and 1.473-4.79 weight parts of micron selenium powder, grinding the mixed powder until the selenium powder becomes amorphous selenium powder; placing the mixed powder in a mold, and shaping the powder at room temperature under pressure of 5-20 MPa to form a green body; sintering and curing the green body under 6.5-12.5 GPa at sintering temperature of 1500-1900 DEG C. The preparation method is simple and can be used for preparing the high-hardness polycrystalline diamond sintering body.

Description

technical field [0001] The invention relates to the technical field of superhard materials, and in particular to a selenium-catalyzed polycrystalline diamond sintered body and a preparation method thereof. Background technique [0002] Polycrystalline diamond sintered body has become the main material for manufacturing cutting tools, shapers, wire drawing dies and digging bits due to its excellent mechanical properties such as extremely high hardness, wear resistance and impact resistance. [0003] Traditional polycrystalline diamond sintered bodies are mostly sintered by diamond particles and metal catalysts under high temperature and high pressure. However, the existing polycrystalline diamond sintered bodies have complicated technological processes, which increases the cost. Contents of the invention [0004] The object of the present invention is to provide a polycrystalline diamond sintered body with selenium catalyst, which has higher hardness. [0005] Another obje...

Claims

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Application Information

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IPC IPC(8): C04B35/52C04B35/622
CPCC04B35/52C04B35/622C04B2235/42C04B2235/5436C04B2235/96
Inventor 王文丹徐国恒洪时明黎傲
Owner SOUTHWEST JIAOTONG UNIV
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