Si-Ti-C-O 繊維結合型セラミックスの微細構造と特性(<特集>セラミックス)

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The microstructure and mechanical properties of Si-Ti-C-O fiber-bonded ceramics (Tyrannohex 【○!R】) produced by hot-pressing pre-oxidized Si-Ti-C-O fibers with a surface oxide (SiO_2 and TiO_2) layer of 250, 430 and 580 nm thickness were investigated. The hot-pressing temperature and pressure were 2023 K and 50 MPa, respectively. Tyrannohex, which was produced using the pre-oxidized fiber with a surface oxide layer of 250nm thickness, showed a close-packed structure with 90 % of volume fraction (V_f) of the fiber. The interstices were packed by an oxide material, which existed on the surface of the raw fiber. It was observed that the oxide material changed to TiC-particle dispersed structure by a reaction between TiO_2, which existed on the fiber's surface, and excess carbon in the fiber during hot-pressing. Moreover, an interfacial carbon layer (10 〜20 nm) around the fiber was formed. Tyrannohex showed very high fracture energy (8900 J/m^2) by Chevron notched beam method. Tyrannohex (V_f=90 %) showed elastic fracture behavior without any plasticity even at 1673 K, because all the fibers were restricted by the close-packed structure. At all the contact points of the fibers, an interfacial carbon layer existed without oxide material. About 90 % of the initial strength was maintained after heat-treatment in air for 1000 hours because of an effective formation of a protective oxide layer on the surface.
社団法人日本材料学会の論文
1996-06-15

Si-Ti-C-O 繊維結合型セラミックスの微細構造と特性(<特集>セラミックス)

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