HI NICALONを強化材とした一方向繊維強化Si_3N_4複合材の機械的特性

概要

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Conventional NICALON fiber has a refractoriness of only about 1200℃ because of its high oxygen content. Recently a new fiber HI NICALON with improved refractoriness has been developed. The slurry process developed by the authors was adopted for the fabrica tion of HI NICALON fiber reinforced Si_3N_4 counpo sites. Carbon coated HI NICALON fiber reinforced composites showed high strength and toughness. At room temperature, samples hot pressed at 1550℃ showed a flexural strength of 890±10 MPa and Krc of 29d±8 MPa √<m> respectively. Samples hot pressed at 1600℃ showed high values at 1200℃ 640 ±70 MPa of flexural strength and 18.3±0.8 MPa √<m> of K_<IC>・ On the other hand, non coated HI NICALON fiber reinforced composites showed a higher flexural strength at 1400℃ than the coated ones, however, they showed a brittle fracture and K_<IC> values were only 3 to 4 MPa √<m>
社団法人日本セラミックス協会の論文
1994-10-01