Si_3N_4セラミックスの焼結過程における固相-気相反応(第3報) : カーボンヒーター炉中の重量減少

概要

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Solid-gas reactions of Si_3N_4 ceramics were investigated with emphasis on the mass loss during sintering under various sagger conditions. A Si_3N_4 powder compact without sintering aids was heat-treated at 2023 K for 0 to 8 h under 0.1 and 1 MPa N_2 adopting three sagger conditions:a Si_3N_4 powder bed, without a powder bed in BN sagger, and without a powder bed in C sagger, and Si_3N_4 with addition of 5 mass% Y_2O_3 and 3 mass% Al_2O_3 was sintered at 2023 K for 0 to 16 h under 0.1 to 100 MPa N_2 adopting four sagger conditions:a 50 mass% Si_3N_4/50 mass% BN powder bed, without a powder bed in BN sagger, a C powder bed, and without a powder bed in C sagger. In C sagger, the principal mass loss reaction was that of Si_3N_4(s) with CO(g):2Si_3N_4(s)+3CO(g)→6SiO(g)+4N_2(g). In BN sagger, the principal mass loss reaction was that of Si_3N_4(s) with SiO_2(l):Si_3N_4(s)+3SiO_2(l)→6SiO(g)+N_2(g). When SiO(g) generated from the sample and the powder bed (based on the above reaction between Si_3N_4(s) and SiO_2(l))was exhausted, the mass loss reaction of Si_3N_4(s) with CO(g) occurred even in BN sagger, which diffused in through a gap of the sagger.
社団法人日本セラミックス協会の論文
2000-03-01