期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 30, 期 15, 页码 3253-3258出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2010.06.006
关键词
Hafnium boride; Spark plasma sintering; Microstructure; Mechanical properties
HfB2-based composites containing 3 vol% silicides of molybdenum or tantalum as sintering additives are densified by spark plasma sintering at 1900-2000 degrees C. Mechanical properties are measured up to 1500 degrees C in air. 4-pt Flexural strength values at 1500 degrees C are 480 MPa (64% of the RT value) for the MoSi2-doped composite and 290 MPa (49% of the RT value) for the TaSi2-doped composite. The fracture toughness is insensitive to the temperature change and reaches 5 MPa m(1/2) for the TaSi2-doped ceramic. (C) 2010 Elsevier Ltd. All rights reserved.
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