窒化ケイ素のクリープ疲労設計の観点からの超高温破壊特性

概要

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High temperature creep and creep-fatigue fracture behavior were investigated in air on two kinds of silicon nitride with different additives of MgO+Y_2O_3 and Al_2O_3+Y_2O_3. Fracture elongation was almost identical in the both cases of creep and creep-fatigue tests at 1673K in air for the two kinds of silicon nitride. The fracture surface was rough in the creep test specimens, while it was relatively smooth in the creep-fatigue test specimens. In the creep-fatigue tests, fracture lifetime was shorter than that of the creep tests. However, for the silicon nitride with MgO+Y_2O_3 the fracture lifetime in the creep-fatigue tests approached to the level of creep tests with increasing the hold time under no stress in the wave pattern. It seems that some intelligent function of the self-repairing of materials damage occurs in silicon nitride with MgO+Y_2O_3.
社団法人日本材料学会の論文
1997-08-15