| 摘要 |
PURPOSE:To obtain the title sintered form of electrical insulation nature, with relatively high thermal conductivity and low thermal expansivity, outstanding in resistance to thermal shock, by forming a powder mixture comprising metallic B or hexagonal BN, metallic Al or AlN, and a sintering aid followed by nitrification sintering. CONSTITUTION:A powder mixture comprising (A) 35-95wt.% on a nitrification product basis, of metallic B and/or hexagonal BN, (B) 65-5wt.% on a nitrifica tion product basis, of metallic Al and/or AlN (except a combination of BN with AlN) and (C) 0.01-30wt.% of a sintering aid is formed and put to nitrifica tion sintering under a nonoxidative atmosphere containing nitrogen, thus obtaining the objective sintered form. The component C is, e.g., aluminum fluo ride, calcium fluoride, yttrium fluoride, calcium borate. In addition to said sintering aid, such compound(s) as aluminum oxide, boron oxide, calcium oxide, calcium carbide, calcium cyanamide may be combined. |
