表面被覆SiCウイスカー強化Si_3N_4複合体の機械的特性

概要

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SiC whiskers were coated with Ti, Al, Y or C by RF-sputtering or plasma CVD in order to modify the inter faicial strength between whisker and matrix. These whiskers with various coatings were used to fabricate Si_3N_4 matrix composites. The mechanical properties of the composites were correlated to the interfacial strength (τ) between whisker and matrix, which was measured for the composites reinforced with SiC continuous fibers with the same coatings as the whiskers. The samples with low τ(5-10 MPa) showed higher fracture energy than those with high τ (90-100MPa), while the high τ samples exhibited better fracture toughness and strength. These results suggest that whiskers with low τ affect the crack wake by pull-out or crack bidging, while those with high τ affect the crack tip before crack propagation starts.
社団法人日本セラミックス協会の論文
1995-09-01