Powdered metallurgy catalyst for synthesizing high-strength diamond

A powder metallurgy and diamond technology, applied in the field of powder metallurgy catalyst for synthesizing high-strength diamond, can solve the problem of high cost

Inactive Publication Date: 2007-08-29
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, from the perspective of raw materials and production costs, the cost of traditional nickel-manganese-cobalt alloy catalysts is also relatively high

Method used

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  • Powdered metallurgy catalyst for synthesizing high-strength diamond

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: Each component is calculated by weight percentage, Co: 15%, Mn: 10%, C: 3%, and the balance is Fe. During preparation, metal powder and carbon powder are fully mixed with a ball mill, and preformed by cold pressing. The metal powder is spherical and has a particle size of 200 mesh. The formed catalyst sheet is sintered in a sintering furnace, and then processed to the required size on a grinding machine. The high temperature and high pressure synthesis parameters are 1300°C and 5.3MPa. The diamond single crystal produced by using the aforementioned components as catalysts is shown in the attached figure.

Embodiment 2

[0023] Example 2: Each component is calculated by weight percentage, Co: 17%, Mn: 5%, C: 5%, and the balance is Fe. During preparation, metal powder and carbon powder are fully mixed with a ball mill, and preformed by cold pressing. The metal powder is spherical and has a particle size of 300 mesh. The formed catalyst sheet is sintered in a sintering furnace, and then processed to the required size on a grinding machine. The high temperature and high pressure synthesis parameters are 1300°C and 5.3MPa.

Embodiment 3

[0024] Example 3: The metal powder before sintering is spherical, and the components are by weight percentage, Co: 12%, Mn: 7%, C: 1%, and the balance is Fe. During preparation, metal powder and carbon powder are fully mixed with a ball mill, and preformed by cold pressing. The metal powder is spherical and the particle size is 100 mesh. The formed catalyst sheet is sintered in a sintering furnace, and then processed to the required size on a grinding machine. The high temperature and high pressure synthesis parameters are 1300°C and 5.3MPa.

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Abstract

The invention relates to a PM catalyst for high intensity synthetic diamond, the percentage by weight of each component in terms of Co: 12 ~ 17%, Mn: 5 ~ 10%, C: 1 ~ 5%, surplus is Fe. Preparation, with metal powder and ball mill will be fully mixed toner, pre-Cold molding. Metal powder was spherical particle size of 100 to 300 head. After sintering and grinding the catalyst tablets treat the need size. In the actual production, the invention used as a catalyst at the high-pressure high-temperature (1300deg.C, 5.3MPa) complex synthetic diamond 40-60 coarse granularity in more than 85%, peak output static strength >= 13kg, in the proportion of 57% and above, the maximum static pressure Strength to 35. The oxygen content of catalyst <150PPm, is conducive to the growth of diamond-shaped, effectively raising the grade synthetic diamond. The massive iron replacement nickel, the overall price is lower than existing technology in the nickel manganese cobalt catalyst.

Description

technical field [0001] The invention relates to a catalyst, in particular to a powder metallurgy catalyst for synthesizing high-strength diamond. Background technique [0002] As we all know, the artificial manufacture and application of diamond single crystal is a great creation of mankind. Because artificial diamond and natural diamond have almost the same performance and far lower cost price. It not only has excellent properties such as high hardness, good wear resistance and corrosion resistance, but also has excellent optical, acoustic, thermal and electrical properties. When synthesizing diamond single crystal under high temperature and high pressure, the pressure required by the former is only 1 / 3 to 1 / 4 of that of the latter compared with that without the catalyst. The use of catalysts can reduce the pressure and temperature of diamond synthesis to about 5.5GPa and 1350°C respectively. At present, nickel, manganese, iron, cobalt and their alloys are basically used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J3/06B01J23/889B01J27/20
Inventor 许斌李木森宫建红李丽邢士波
Owner SHANDONG JIANZHU UNIV
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