PURPOSE: To easily minimize the impurity elements by heating and firing/a solid obtained by superheating and then solidifying a specified component in a nonoxidizing atmosphere.
CONSTITUTION: Group 1-13 elements (Ia-VIIa, VIIIa and Ib-IIIb), group 14 (IVb) elements of ≥14 atomic number, group 15 (Vb) elements of ≥33 atomic number and rare-earth elements are selected as the impurities. A polymerizable or cross-linkable org. compd. free from the impurities or the compds. of the impurities or a composition consisting of the compd. and a catalyst or cross-linking agent free from the impurities is heated and solidifed, and then the obtained solid is heated and solidified in a nonoxidizing atmosphere to produce a high- purity carbon powder contg. ≤1 ppm of impurity elements. The carbon carbon powder is mixed with a component free from group 3 (IIIa) elements or their compds., and the mixture is heated and solidified in a nonoxidizing atmosphere not contg. N atom to produce a high-purity carbide powder contg.≤10 ppm of the impurity elements.
WADA HIROAKI
YAMADA TOMOHARU
