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Wang Daobin, “Effects of Rare Earth on Synthetic Diamond of FeNi29Co1 Powder Catalyst†Abstract: The synthesis of synthetic diamond is mainly based on static pressure catalyst. At present, powder catalyst is commonly used to synthesize diamond. The catalyst generally uses an alloy powder in which the element VIII is a basic constituent element, and includes a Ni-based, Fe-based, and Co-based alloy. In order to enhance the catalytic activity, it is necessary to add trace elements to the catalyst, reduce the conditions of graphite conversion to diamond (temperature, pressure); change the nucleation number and growth rate of diamond; improve the crystal form of diamond; reduce O which is harmful to the growth of synthetic diamond , S and other impurity content; reduce the formation of diamond internal inclusions, improve the color of diamonds. Studies have shown that Cu, Fe, Nb, Mn can change the nucleation and growth conditions of diamond; B, Al, P, Ba can obtain semiconductor diamond; in addition to Fe, Ni, Co, Ti, Cu, Cr elements, B, N 2 also has a significant effect on changing the color of diamond; the addition of rare earth elements such as La and Ce has a great influence on the growth quality of diamond. During the synthesis process, the impurity elements such as O and S present in the catalyst and graphite have a negative influence on the quality of the diamond. In particular, the O element forms a stable compound with the metal element in the catalyst. These compounds cannot be used in the subsequent heat treatment. It is completely reduced, hinders the nucleation and growth of diamond, and reduces the catalytic activity of the catalyst or the formation of inclusions such as inclusions inside the diamond, thereby affecting the crystal quality of the diamond. Studies have shown that the addition of rare earths in graphite columns helps to increase the impact toughness TI of diamond. In order to reduce the content of O element in powder catalyst, this paper draws on the experience of iron and steel metallurgy, adding rare earth (Re) as deoxidizer in the preparation process of FeNi29Co1 alloy grinding, and conducting diamond synthesis experiment, which is water atomized powder catalyst. Produce high quality diamonds to explore new ideas. The addition of rare earth in FeNi29Co1 catalyst powder is beneficial to the synthesis of high-performance diamond. The synthesized diamond mixed yield, crystal face integrity rate, color, etc. are improved, the proportion of high-strength material is improved, and the addition of rare earth elements has purification and impurity removal. The role. The above text is selected from the "Impact of Rare Earth on FeNi29Co1 Powder Catalyst Synthetic Diamond", which is included in the "2012 China Superhard Materials Technology Development Forum Proceedings".
Wang Daobin from the Beijing Research Institute of Nonferrous Metals and the National Nonferrous Metals Composites Engineering Technology Research Center presented the technical report on the Influence of Rare Earth on FeNi29Co1 Powder Catalytic Synthetic Diamond at the 2012 China Superhard Materials Technology Development Forum.