| 摘要 |
PROBLEM TO BE SOLVED: To obtain a molded body composed mainly of highly conductive carbon by blending flaky graphite with a specific boron ceramics, then molding and heat-treating them. SOLUTION: The raw materials of this composite comprising 1 pts.wt. of flaky graphite which is a natural graphite of size larger than a few hundred μm and 1-2.5 pts.wt. of one or more kinds of boron ceramics of purity more than 99% and the granular size less than about 10, selected from titanium diboride (TiB2 ), zirconium diboride (ZrB2 ) and hafnium diboride (HfB2 ), is preliminarily mixed thoroughly in a short time and this premixed material is roller- formed into a sheet or a ribbon to orient the graphite of two-dimensional layer structure, in one direction as much as possible. The formed article is then heat- treated in an inactive gas such as argon and helium, etc., (excluding nitrogen) at 2,500-3,000 deg.C to give a highly conductive composite having a conductivity of 2.5×10<4> (S/cm) close to HOPG(highly oriented pyrolytic graphite) having the highest conductivity in graphites, and this conductive carbon composite has satisfactory strength as a molded article. |
