BNとTiの反応性放電プラズマ焼結によるTiB_2-TiN複合体の合成 Synthesis of TiB_2-TiN Composites by Reactive Spark Plasma Sintering of BN and Ti
Reactive spark plasma sintering technique was applied to the synthesis of TiB<SUB>2</SUB>-TiN<SUB>x</SUB> composites from BN and Ti powders and the simultaneous consolidation of them. The nonstoichiometry of synthesized TiN<SUB>x</SUB> (x=0.6-1.0) was controlled by the change of the molar ratio of BN and Ti starting<BR>powders and the resulting displacement reaction 2BN+(1+2/x)Ti→(TiB<SUB>2</SUB>+2/xTiN<SUB>x</SUB>. When x is 0.9 and below, the relative density of composites reached more than 99.6 % at a sintering temperature of 2000°C, because of the good sinterability of nonstoichiometric TiN<SUB>x</SUB>. For dense composites, Young's<BR>modulus increased with x, but hardness decreased. The composite at x=0.9 had the highest values for Young's modulus (476 GPa) and fracture toughness (3.2 MPa m<SUP>1/2</SUP>)as well as good sinterability.
粉体および粉末冶金 46(4), 383-389, 1999-04-15
Japan Society of Powder and Powder Metallurgy