Nano-SiC ceramic sintering at ultra-high pressure and high temperature

作者：Xie Mao Lin^*; Luo De Li; Xian Xiao Bin; Leng Bang Yi; Xie Dong Hua; Lu Wei Yuan

来源：Journal of Inorganic Materials, 2008, 23(4): 811-814.

DOI：10.3724/sp.j.1077.2008.00811

• ultra-high pressure
• sinter
• silicon carbide
• alumina

High-density Sic ceramics doped with 2wt% Al2O3 additives were fabricated by ultra-high pressure and high temperature technique (4.5GPa,1250 degrees C,20min). The structures, grain size, lattice parameters, chemical component, morphology and mechanical property of the sintered Sic ceramics were characterized by X-ray diffraction (XRD), X-ray photoelectron energy spectroscope (XPS), scanning electron microscope (SEM), energy dispersive X-ray spectroscope (EDX) and nano impress indenter. The results show that nano-SiC ceramic is fully densified by ultra-high pressure technique at, relative low temperature (1250 +/- 50 degrees C). No phase transfer or holes is found in the sintered nano-SiC ceramic. The hardness and elastic modulus of the sintered SiC ceramic with grain size of 22nm and lattice parameters of 4.355 angstrom are 33.7GPa and 407GPa, respectively.

• 出版日期2008-7
• 单位中国工程物理研究院