窒化ケイ素-窒化ホウ素複合材料の反応焼結による寸法変化(テクニカルレポート)

概要

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A silicon nitride (Si_3N_4)-boron nitride (h-BN) composite is utilized for brazing jig, since it shows low-wettability for brazing metals. Combination of green machining and reaction bonding (RB) is a potential process to reduce machining cost. However, precision is a problem. Thus, in this work, the composite was fabricated by uniaxial die-pressing followed by cold isostatic pressing, green machining and reaction bonding. Precision of green machining and dimensional change (i.e., expansion) after RB were investigated. Green machining was successfully done, and dimensions of the specimen were within the acceptable error range of 100μm. After RB, the specimen was slightly expanded. Expansions were about 0.5% and 0.9%, respectively, for perpendicular and parallel to the die pressing direction. Ununiform expansion seemed to be due to the alignment of h-BN caused by uniaxial die pressing.
社団法人日本セラミックス協会の論文
2007-02-01