期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 465, 期 1-2, 页码 506-511出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2007.10.137
关键词
ZrB2-SiC UHTCs; Y2O3; Microstructure; Mechanical properties
资金
- NSFC [50602010, 50702016]
- Research Fund for the Doctoral Program of Higher Education [20060213031]
Hot-pressed ZrB2-SiC ceramics was hot-pressed at a temperature of 1900 degrees C, and yttria (Y2O3) was added as a sintering aid. The amount of Y2O3 that was added had a significant influence on the sinterability and mechanical properties of the ZrB2-SiC ceramics. When a small amount (3 vol.%) of Y2O3 was added, the Y2O3 reacted with impurities oxides (ZrO2, B2O3 and SiO2) that were present on the surface of the starting powder. The elimination of impurities oxides suppressed the grain growth effectively, which led to an improvement in the densification of ZrB2-SiC ceramics. The mechanical properties, both the flexural strength and fracture toughness were enhanced through these improvements in the sinterability and microstructure. On the other hand, when a large amount (8 vol.%) of Y2O3 was added, the mechanical properties were not improved much, presumably because the extra additive made redundant liquid phase at the grain boundaries. (C) 2007 Elsevier B.V. All rights reserved.
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