スラリー及び有機ケイ素ポリマーの含浸による3次元炭素繊維強化Si_3N_4基複合材料の作製

概要

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Three-dimensional(3D)carbon fiber reinforced Si_3N_4 composites have been fabricated using slurry infiltration and repeated infiltration of organosilicon(polysilazane)resin. Volume fractions of the fiber and Si_3N_4 powder of the slurry-infiltrated body were about 42 and 32%, respectively. Open porosity was decreased from 26% after the slurry infiltration to approximately 9% after the repetition of the polysilazane infiltration and pyrolysis. The relative density of the body which underwent the pyrolysis of polysilazane at 1873 K reached 89.4% after 6 cycles. However, the highest flexural strength and fracture toughness were obtained at a pyrolysis temperature of 1673 K. Further reduction of open porosity to less than 2% was accomplished by hot-pressing at 1873 K. The maximum values of flexural strength and fracture toughness were 360 MPa and 9.8 MPa・m^<1/2>, respectively.
社団法人日本セラミックス協会の論文
1998-03-01