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Improvement of the mechanical properties of hot-pressed silicon-carbide-fiber-reinforced silicon carbide composites by polycarbosilane impregnation
Ist Teil von
Composites science and technology, 2001-07, Vol.61 (9), p.1323-1329
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2001
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
Green sheets of SiC with Al
2O
3–Y
2O
3–CaO sintering additives prepared by the doctor-blade method and polycarbosilane (PCS)-impregnated Hi-Nicalon cloth with a BN coating were used for the fabrication of SiC-fiber-reinforced SiC (SiC/SiC
f) composites by hot-pressing. Two kinds of SiC/SiC
f composites with different fiber volume fractions were fabricated and their room-temperature mechanical properties were investigated. These composites showed non-brittle fracture behavior. The maximum strength of a composite with 52 vol.% of fibers was about twice as high as that of a composite with 40 vol.% of fibers, and the composite hot-pressed at 1700°C showed the highest maximum strength. In this fabrication process, PCS-impregnation into Hi-Nicalon cloth was an effective way of forming the matrix between fibers.