SiCウィスカー強化アルミナのき裂治癒挙動・高温強度および破壊じん性値(<特集>セラミック材料)

概要

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Alumina ceramic reinforced by SiC whisker was sintered. Three point bending specimen was made from the composite ceramic. A semi-elliptical surface crack up to 450μm in diameter (aspect ratio ≒ 0.9) was introduced on the specimen. Basic crack-healing behavior of the cracked-sample was studied systematically as a function of crackhealing temperature, and also bending strength of crack-healed sample was tested systematically. Followings are main conclusions obtained : (1) Alumina reinforced by SiC whisker exhibited large crack-healing ability. (2) The fracture toughness K_<IC> of the composite alumina was increased by the SiC whisker reinforcement considerably as compared with alumina reinforced by SiC particles. (3) The crack-healed alumina exhibited the same level bending strength (σ_B) as the base material and very high σ_B up to 1473K. (4) The alumina was able to heal the crack even under cyclic stress at 1473K, and the critical stress intensity factor (K^C_<HS>) was found to be 3.8MPa √<m>.
社団法人日本材料学会の論文
2004-06-15