期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 32, 期 10, 页码 2557-2563出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.02.017
关键词
Hot pressing; Mechanical properties; Hafnium diboride; UHTCs; Synthesis
资金
- Chinese Academy of Sciences
- National Natural Science Foundation of China [50632070]
- Science and Technology Commission of Shanghai [08520707800, 09ZR1435500]
HfB2 and HfB2-10 vol% HfC fine powders were synthesized by carbo/boronthermal reduction of HfO2, which showed high sinterability. Using the as-synthesized powders and commercially available SiC as starting powders, nearly full dense HfB2-20 vol% SiC (HS) and HfB2-8 vol% HfC-20 vol% SiC (HHS) ceramics were obtained by hot pressing at 2000 degrees C/30 MPa. With the incorporation of HfC, the grain size of HHS was much finer than HS. As well, the fracture toughness and bending strength of HHS (5.09 MPa m(1/2), 863 MPa) increased significantly compared with HS (3.95 MPa m(1/2), 654 MPa). Therefore, it could be concluded that the incorporation of HfC refined the microstructure and improved the mechanical properties of HfB2-SiC ceramics. (C) 2012 Elsevier Ltd. All rights reserved.
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