417 窒化珪素セラミックスの高温酸化挙動(材料工学)

概要

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Si_3N_4 ceramics were prepared by hot-pressing method and investigated the behavior of high temparature oxdation. Four kinds of spesimens were treated at 1300℃ in air enveronment for 1OOhour to 2000hour. The characteristics of spesimens were as follows. a) Si_3N_4 added 8wt% Y_2O_3. b) Si_3N_4 added 5wt% Y_2O_3 and 3wt%Al_2O_3. c) Si_3N_4/SiC added 8wt% Ya_2O_3. d) Si_3N_4 /SiC added 5wt% Y_2O_3 and 3wt%Al_20_3. The main concludions are as follows. 1) Ox'layer of SN-Y5A3 was most thick and SNS-Y8 was most thin. 2) Relationship between the thickness of ox'layer and heat treatment time followed paraboric law in all spesimens. 3) The diffusion zone inside ox'layer of spesimens added Y_2O_3 and Al_2O_3 was very depth. 4) Crystalline phase of the surface were mainly SiO_2 and Y_2Si_2O_7.
社団法人日本機械学会の論文
2001-03-09