期刊
COMPOSITES SCIENCE AND TECHNOLOGY
卷 67, 期 1, 页码 119-124出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compscitech.2006.03.022
关键词
preceramic polymer; porosity; mechanical properties; ceramics
Microcellular silicon oxycarbides have been produced by pyrolysis of methylsilicone resin with the help of sacrificial microbeads of polymethyl methacrylate (PMMA). The PMMA microbeads were added in the range from 0 to 80 wt%, and the pyrolysis was performed at 800-1200 degrees C. The volume shrinkage resulting from the polymer-to-ceramic conversion becomes constant at the pyrolysis temperature above 1000 degrees C, and the shrinkage value reaches about 60% by a PMMA addition of 80 wt%. In the all range of PMMA additive ratios, the spherical micro pores with the wide range diameter from I to 10 mu m are produced in the matrix. The open-cells, which are formed above 30 wt% of PMMA addition, have the open pores size bigger than 0.5 mu m. The bending strength and the elastic modulus of the product exhibit the maximum values, i.e., 24.1 MPa and 16.0 GPa, respectively, when PMMA addition is 50 wt%. (c) 2006 Elsevier Ltd. All rights reserved.
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