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Preparation of C/SiC Composites by Hot Pressing, Using Different C Fiber Content as Reinforcement
Author(s) -
Ding Yusheng,
Dong Shaoming,
Zhou Qing,
Huang Zhenren,
Jiang Dongliang
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00872.x
Subject(s) - composite material , materials science , hot pressing , thermal expansion , volume fraction , fiber , pressing , residual stress , reinforcement , volume (thermodynamics) , physics , quantum mechanics
Unidirectional C/SiC composites were successfully prepared by hot pressing at 1850°C under 20 MPa, using different fiber volume fractions (from 28 vol% to 55 vol%) as reinforcement. The densification process of the composites became increasingly difficult with increasing fiber volume fraction, and some small pores were still distributed in the intrabundle regions of the composites. The cracks, resulting from the residual thermal stress in the composites due to the mismatch of the thermal expansion coefficient of the matrix and the fiber, were distributed in the matrix. With the increase of fiber content, the mechanical properties of the composites could be improved and the composites exhibited an obvious noncatastrophic fracture behavior due to a decrease in the thermal residual stress and an increase in the fiber pull outs.