Effect of chopped Si–Al–C fiber addition on the mechanical properties of silicon carbide composite
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Silicon carbide (SiC) composites containing 0–50 mass% of chopped Tyranno® Si–Al–C (SA) fiber (mean length: 214 μm (SA(214)), 394 μm (SA(394)), and 706 μm (SA(706)) were fabricated using the hot-pressing technique at 1800 °C for 30 min under a uniaxial pressure of 31 MPa in Ar atmosphere. The maximum flexural strength of the SiC composite was 344 MPa for 30 mass% of SA(706) fiber addition, whilst the maximum fracture toughness was 4.7 MPa m1/2 for 40 mass% of SA(706) fiber addition. Increasing the mean fiber length from 214 to 706 μm decreased the flexural strength from 380 to 281 MPa for 30 mass% of fiber addition, whilst the fracture toughness increased from 3.4 to 4.7 MPa m1/2 for 40 mass% of fiber addition. Through use of a treated SA(706) fiber containing an approximately 100 nm surface layer of carbon, the fracture toughness further increased to 6.0 MPa m1/2 for 40 mass% of fiber addition; this value was more than twice that of the monolithic SiC ceramic and is believed to be the highest so far achieved for this type of SiC/SiC composite containing chopped fibers.
KeywordsFracture Toughness Flexural Strength Fiber Length Notch Radius Fiber Addition
The authors wish to express their thanks to Dr. M. Shibuya of Ube Industries, Ltd., for providing the Tyranno® Si–Al–C fibers used in this work and for measuring the Auger depth profile of the SA(706)/C fiber.
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