SiC繊維/ホウケイ酸ガラス複合材(第1報) : マトリックスの失透

概要

論文の詳細を見る
The crystallization behaviour of borosillicate glass (Pyrex) with and without a continuous SiC fibre reinforcement has been investigated as a function of heat treating time (10 min to 20h), temperatures (800 to 1050℃) and particle sizes. The tendency to crystallize into cristobalite was found to be very sensitive to the particle size of Pyrex glass. Finer particles exhibited a higher amount of cristobalite than coarse particles for the same heat treating conditions, indicating that crystallization of Pyrex resulted from heterogeneous nucleation and growth on the surface of each particle. For the SiC fibre/Pyrex composite, the presence of fibres appeared not to contribute significantly to the devitrification of matrix, since (1)nearly same degree of devitrification occurred in the Pyrex powder compact alone compared with the degree of crystallization in the SiC fibre/Pyrex composite with same size of Pyrex particle, and (2)devitrification occurred randomly rather than occurring preferentially at the matrix-fibre interfaces. The devitrification of Pyrex matrix to cristobalite under processing conditions used for composites gave rise to extensive microcracking. The thermal mismatch stress originating from both a higher coefficient of thermal expansion of devitrified cristobalite and 〜3.9% volume change at the phase transition temperature (〜250℃) of cristobalite was calculated using the particle sphere model. The magnitude of stress calculated was high enough to cause cracking in and around a cristobalite particle wurrounded by a Pyrex matrix.
社団法人日本セラミックス協会の論文
1995-04-01

SiC繊維/ホウケイ酸ガラス複合材(第1報) : マトリックスの失透

スポンサーリンク

概要

著者

関連論文

スポンサーリンク