Si_3N_4-SiC-ZrC-ZrN系の1気圧窒素中1650℃における反応と相関係

概要

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Reactions among Sl_3N_4, SiC, ZrC, ZrN and C were investigated under 1 atm N_2 at 1650℃. Compatibility relations among the compounds coexisting with 1 atm N_2 in the system Si-Zr-C-N were determined. Equilibrium states were confirmed by the fact that reaction products obtained from nitridation reactions were identical with those from decomposition of nitrides and by thermochemical calculation. The reaction products obtained from the starting sample of ZrC- Si_3N_4 were zirconium carbonitride and SiC, and those from ZrN-SiC were zirconium carbonitride and Si_3N_4. The lattice parameter of the zirconium carbonitride varied with the composition of the starting sample. The isobaric and isothermal section of the system Si-Zr-C-N includes 2 three-phase triangles : the area [IJ ZrC_xN_<1-x> (x=0.43) + C+SiC, the area [III] ZrC_yN_<1-y> (y =0.32) +SiC+Si_3N_4 and 2 two-phase regions ' the area [II] ZrC_<1-b>N_b (O.32<1-b <0.43) +SiC, the area [IV] ZrC_cN_<1-c> (0≦c <0.32) + Si_3N_4, On the assumption that zirconium carbonitride might be a regular solution between ZrC and ZrN, the interaction parameter of zirconium carbonitride was estimated to be - 6〜-10 kcal/mol from thermochemical calculation.
社団法人日本セラミックス協会の論文
1989-09-01