Affiliation:
1. Sichuan University
2. Beijing Sinoma Research Institute of Synthetic Crystals
Abstract
Transparent Mg-Al spinel ceramics of four different nonstoichiometries were obtained
utilizing two-stage sintering technique of vacuum sintering and post hot isostatic pressing using
MgO·nAl2O3 powders with n of 1, 1.3, 1.5 and 1.8, respectively, as raw materials. The mechanical
properties of the ceramics were measured and indentation shapes and radial crack propagations were
observed. The results showed that change of molar ratio of Al2O3 to MgO leads to variation of
indentation shapes and crack propagations of the ceramics, resulting in the change of mechanical
properties of the ceramics. The flexural strengths of the ceramics increase first then decrease with
increasing n. However, the hardness and fracture toughness of the ceramics increase with increasing n.
As a result, an optimal n for high performance ceramic is suggested to be 1.5. In addition, mechanisms
of toughening and strengthening of the transparent ceramics have also been discussed.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science
Cited by
19 articles.
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