Abstract
A three-dimensional Tyranno fibre reinforced SiC composite was fabricated by infiltration of molten polycarbosilane into three-dimensional textile preform (volume fraction; 39%) in an autoclave followed by pyrolysis in argon up to 1200 °C. An attempt to improve the density of the composite was done by repeated infiltration and pyrolysis. As a result of 10 times repetition, the density of the composite was increased to 2.4 g cm −3 (relative density; 83%, open porosity; 5%). Bending strength and fracture toughness were 420 MPa and 11.5 MPa m 1 2 , respectively. The composite showed semistable fracture behaviour because of bridging of fibre parallel with the tensile direction.
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