1205 成分系が窒化珪素セラミックスの高温酸化挙動に及ぼす影響

概要

論文の詳細を見る
Si_3N_4 ceramics were prepared by hot-pressing method and investigated the behavior of high temperature oxidation. Four kinds of specimens were treated at 1300℃ in air environment for 2000hours. The characteristics of specimens were as follows. a) Si_3N_4 added 8mass% Y_2O_3. b) Si_3N_4 added 5mass% Y_2O_3 and 3mass%Al_2O_3. c) Si_3N_4 /SiC added 8mass% Y_2O_3. d) Si_3N_4 /SiC added 5mass% Y_2O_3 and 3mass%Al_2O_3. The main conclusions are as follows. 1) Oxidized layer of SN-Y5A3 was most thick and SNS-Y8 was most thin. 2) Relationship between the thickness of oxidized layer and heat treatment time followed parabolic law in all specimens. 3) The diffusion zone inside oxidized layer of specimens added Y_2O_3 and Al_2O_3 was very depth. 4) Crystalline phases 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
2003-09-23