Electrical Conductivity of MoSi2-SiC Cera1mics Prepared by Reaction Sintering of Polysilazane with Molybdnum Metal (特集 ナノ構造制御と新機能発現) Electrical Conductivity of MoSi_2-SiC Ceramics Prepared by Reaction Sintering of Polysilazane with Molybdenum Metal
To develop high-temperature heat elements with a small temperature-coefficient electrical conductivity, small-grained MoSi<SUB>2</SUB>-SiC ceramics were prepared by reaction sintering ceramic precursor with molybdenum powder. By second sintering at 1773 K for 10 h, two phases of MoSi<SUB>2</SUB> and β-SiC were formed. The average grain size of both MoSi<SUB>2</SUB> and SiC ranges several tens nanometers. Electrical conductivity measurement revealed that conductive behavior changed from semiconductive to metallic with increasing molybdenum disilicide content. 54.3 wt% MoSi<SUB>2</SUB>/β-SiC composite showed an almost constant temperature coefficent in the temperature range at around to 600-850 K.
粉体および粉末冶金 45(12), 1162-1165, 1998-12-15
Japan Society of Powder and Powder Metallurgy