ポリシラザンをマトリックス原料に用いた繊維強化セラミックスの機械的特性に及ぼすマトリックスの結晶性の影響

概要

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Fiber-reinforced ceramics were fabricated by using pehrydropolysilzane (PHS), polyborosilazane added PHS (PHS-B) or methylhydropolysilazane (MHS) as matrix precursors, and their mechanical properties were investigated with respect to the crystallinity of the matrix. By firing at 1523 K, MRS and PHS-B formed amorphous matrix and gave composites with the fiexural strength of 820 and 920 MPa. PHS formed a crystalline matrix and gave a composite with a flexural strength of 450 MPa. The high strength composites may be brought by the lower elastic modulus of amorphous matrix as compared to the crystalline one. Because the low-elastic matrix decreases the stress concentration on fiber due to matrix-cracks. The heat resistance of the composite was tested upon heat exposure at 1523 K for 720 ks. The amorphous composite, fabricated by MRS at 1623 K, endured the heat exposure and retained 77% of its initial strength.
社団法人日本セラミックス協会の論文
2002-08-01