HfB2-SiC composite prepared by reactive spark plasma sintering

作者：Wang, Hailong; Lee, Sea-Hoon^*; Feng, Lun

来源：Ceramics International, 2014, 40(7): 11009-11013.

DOI：10.1016/j.ceramint.2014.03.107

• Hafnium diboride
• Microstructure
• Reactive spark plasma sintering

Dense HfB2-SiC composites were fabricated by reactive spark plasma sintering of a powder mixture composed of HfSi2, B4C and carbon. The relative density of the composites was 98.7% after reactive spark plasma sintering at 1600 degrees C under a pressure of 40 MPa for 10 min. Strong exothermic reaction occurred during the heating of the powder mixture due to the following reaction: 2HfSi(2)+B4C+3C=2HfB(2)+4SiC. The in situ formed HfB2 and SiC phases were homogeneously distributed. The average grain size of formed HfB2 and SiC was about 2 and 1 inn, respectively. The Vickers hardness and fracture toughness of HfB2-SiC composites were 20.4 +/- 1.5 GPa and 4.7 +/- 0.3 MPa m(1/2), respectively. The present report proposes a method to densify HfB2-based composites at a low temperature.

• 出版日期2014-8
• 单位郑州大学