NON OXIDE SINTERED BODY HAVING IMPROVED WORKABILITY AND SYSTEM USING THE SAME

摘要

PURPOSE:To improve workability by sintering after mixing a prescribed molar ratio of a compound of metal element having specified ionic radius and a nonoxide ceramic. CONSTITUTION:Into the nonoxide ceramic incorporating 90vol.% of more than one kinds of silicon nitride, silicon carbide and zirconium boride consisting of elements each having 0.08nm ionic radius, for example, a fluoride, carbonate, nitrate, chloride, bromide, iodide or acetate of a metal element having 0.14nm ionic radius such as Ba, Rb or Cs and a compound decomposing below sintering temp. of sintered body to form metallic ions blended as 0.1-5mol% against the total sintered body. This blend is mixed, and after molding and sintering at a prescribed condition, a nonoxide sintered body having a structure in which the metallic ions exist at the boundary phase of the sintering body, a triple boundary point of the boundary phase and deposited material or the whole or a part of the boundary face. This sintered body is exemplified by the pressure cooker test in the condition, at 121 deg.C, 2 atm., 100% relative humidity lasting for 100hrs. and the weight difference per unit area of the sintered body by the test is 10-3g/cm2.