炭化ケイ素ウイスカー強化ムライト複合材料の機械的性質(第1報) : 焼結体の強度及び微細組織に対する混合溶媒中での分散剤濃度の影響

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The dispersibility of mixed powder consisting of mullite and SiC whisker in solvents was assessed by carrying out sedimentation tests and viscosity measurements.The dispersibility was improved with increasing dispersant content and became good by adding dispersant over 0.5 mass%.On the other hand, the dispersibility of mixed powder consisting of mullite and carbon-coated SiC whisker W(AC)was better than that of mixed powder consisting of mullite and W(A), despite the dispersibility of W(AC)being worse than that of W(A) if their particles existed alone in solvent.However, the dispersibility of the mixed powder consisting of mullite and W(AC) was lowered on addition of 0.5mass% dispersant and improved again on addition of 1.0mass%.The strength of SiC whisker-reinforced mullite composites became maximum by addition on 0.5-0.1mass% dispersant to the solvent used in powder-mixing.
1998-09-01