ホットプレス法による炭化けい素繊維強化炭素(SiC/C)複合材料の作製とその強度に及ぼす繊維の形態の影響
1988 年 74 巻 4 号 p. 710-717
詳細
1988 年 74 巻 4 号 p. 710-717
Silicon-carbide continuous fiber reinforced carbon (SiC/C) composites was fabricated using a simple hot press process. Three forms of SiC fiber reinforcement, that is, cloth, mat and unidirectional long fibers (UD fibers) were employed. Fine pulverized coke mixed with carbonaceous bulk mesophase (BM) was used as matrix. In this process, SiC fibers were laminated alternately with the matrix admixture in a die, and then heated to 600°C under a pressure of 49 MPa.
The results were as follows:
(1) The maximum strengths of the composites were the greatest for the UD fiber reinforcements at 121.5 MPa while the cloth and mat reinforcements showed appreciably lower strengths.
(2) After secondary heat treatments at 800°C to 1 500°C, the composite reinforced with UD fibers showed excellent strengths above 106 MPa which were greater than that of an as-fabricated commercial C/C composite. The strengths of the composites reinforced with cloth and mat, however, were significantly reduced by the heat treatments.
