Powdered metallurgy catalyst for synthesizing high-strength diamond

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...

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