Effect of additive boron on synthesizing diamond using pure iron powder catalyst;

After adding boron powder to iron-based powder catalyst,fine monocrystal diamond has been synthesized in a China-made cubic hinge press by using high temperature and high pressure,meanwhile a best proportion for adding boron powder to synthesize boron-bearing fine monocrystal diamond has also been found.

Study on the catalytic performance and its influence factors of NiMnCo powder catalyst with different sizes;

Study of vacuum sintering technique of powder catalyst capsule;

According to statistics from related experts, through forty-year efforts, our nation annually has 2-3 billion carats of diamond yield; and another related statistics shows that through ten-year efforts, 20% of domestic diamond is produced with powder catalyst.

This paper introduces the method of preparation of catalyst powder FeNi27Co3 by the way of co-precipitation-decomposition,and studies the influence of pH value,metal ion concentration,feed rate and the amount of additives on sediment formation and particle size.