Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10626650 | Ceramics International | 2005 | 6 Pages |
Abstract
Alumina ceramics with high fracture toughness were synthesised by introducing seeds and controlling processing using the in situ self-toughening technique. The preparation of the high tough alumina materials started with cheap commercial aluminum hydroxide as raw materials. α-Alumina powder was gained by low temperature calcination of the aluminum hydroxide with seeds, which were introduced by high purity alumina ball medium during grinding. The alumina powders were hot-pressed, then, the high tough alumina ceramics with elongated grains were obtained. The elongated grain structure is originally considered to play a significant role in the increment of fracture toughness. Meanwhile, in order to investigate in situ toughening mechanism of elongated alumina grains, which can produce crack bridging, crack deflection and pull-out as dominant toughening mechanisms to greatly increase toughness, fractal characteristics and model were studied in detail.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Lihua Xu, Zhipeng Xie, Lichun Gao, Xidong Wang, Fang Lian, Tong Liu, Wenchao Li,