Influence of ZrB2 content on properties of LaB6-ZrB2 composites

被引：0
|
作者：
Gao, Ruilan [1 ]
Yu, Huashun [1 ]
Han, Jiande [1 ]
Min, Guanghui [1 ]
Paderno, Y.B. [2 ]
机构：
[1] Ctr. on New Mat., Sch. of Mat. Sci. and Eng., Shandong Univ., Ji'nan 250061, China
[2] Inst. of Problems for Mat., Natl. Acad. of Sci. of Ukraine, Kiev 03142, Ukraine
来源：
Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society | 2004年 / 32卷 / 04期
关键词：
Bending strength - Borides - Carbon - Crystal microstructure - Fracture toughness - Hardness - Hot pressing - Lanthanum compounds - Morphology - Polycrystalline materials - Reduction - Scanning electron microscopy - Sintering - Zirconium compounds;
D O I：
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中图分类号：
学科分类号：
摘要：
LaB6-ZrB2 composite powders with different contents of ZrB2 were synthesized by the carbon thermo-reduction method and the corresponding polycrystalline composites were fabricated by the hot pressing sintering method. The effects of the ZrB2 content on the microstructure and mechanical properties of the composites were studied. The results show that the hardness and the bending strength of LaB6-ZrB2 poly-crystals are enhanced with the increase of ZrB2 content, while the fracture toughness is increased firstly and decreased afterwards and it reaches the optimum value when the mass fraction of ZrB2 is 21%. The microstructure and the fracture morphology of the composites were revealed by means of metallographic and SEM. The improvement mechanism of the fracture toughness of the composites by adding ZrB2 was analyzed.
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页码：507 / 511
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