籾殻からバインダレスで製造した炭素シリカ複合体の力学特性

概要

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A carbon/silica composite (CSC) designed for use under sliding and compressive load was fabricated from rice husk (RH), an agricultural waste material, without using any binders. A compression pressure of 100 MPa was applied to the RH powder heated from room temperature to 150°C firstly, and then that heated at 280°C for 10min secondly. The RH powder was finally heated from280 to 500°C without compression, producing the precursor of CSCs. The CSCs were produced by sintering the precursor in an electric furnace at 800, 1000, 1200, and 1400°C without compression, innitrogen gas. The CSC sintering at 800°C for 1 h in nitrogen gas provided the maximum bulk density of 1.52 g/cm3. The maximum compressive strength was measured to be 55.7 MPa at the sinteringtemperature of 1200°C. The maximum Vickers microhardness at the surface of 476 appeared on the CSC produced at the second compression pressure of 200 MPa and then sintered at 800°C . The CSC sintered at 1000 °C showed the static friction coefficient of 0.15 and the dynamic friction coefficient of 0.05 under the contact with SUS304 stainless steel.