Fracture toughness, strength and creep of transparent ceramics at high temperature

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• 作者：Marek Boniecki ; ^{Marek.Boniecki@itme.edu.pl} ; ^{Marek-Boniecki@wp.pl} ; Zdzis艂aw Librant ; Anna Wajler ; W艂adys艂aw Weso艂owski ; Helena W臋glarz
• 关键词：C. Creep ; C. Fracture ; C. Strength ; Transparent ceramics
• 刊名：Ceramics International
• 出版年：2012
• 期刊代码：13_02728842
• 类别：ms
• 出版时间：August, 2012
• 卷：38
• 期：6
• 页码：4517-4524
• 文件大小：1333 K

摘要

Fracture toughness, four-point bending strength of transparent spinel, Y₂O₃ and YAG ceramics in function of temperature (from room temperature up to 1500掳 C) were measured. Creep resistance at 1500-1550掳 C was studied too. Grain size distribution was determined on polished and etched surfaces of samples. Fracture surfaces after tests were examined by scanning electron microscopy. The obtained results showed that: in the case of spinel ceramics fracture toughness and strength decreased from 20 to 800掳 C, increased from 800 to 1200掳 C and decreased at higher temperature; in the case of Y₂O₃ ceramics they increased from 400 to 800掳 C, and next kept constant up to 1500掳 C; in the case of YAG ceramics they kept constant from 20 to 1200掳 C and then decreased. The creep strain rate was measured for spinel and YAG but not for Y₂O₃ ceramics which appeared creep resistant. The hypotheses concerning toughening and creep mechanisms were proposed.