The Process and the Properties of Carbon Fiber/Alumina Composite Materials

The purpose of this study is to investigate the production process of carbon fiber/alumina composite materials and to examine the properties of the materials.The composites can be produced by hot-pressing mixtures of fibers and powders. During hotpressing, fibers are cut if the modulus of elasticity of fibers is high, compaction pressure is high and hot-pressing temperature is low. The composites indicate lower bending strengths than those of sintered alumina, but have better thermal shock resistances. The composite containing 18% fibers has the best thermal shock resistance in this study. The mechanical and physical properties of composites are; the density ratio is 96.2%, bending strength 17.4 kg/mm2, coefficient of thermal expansion 15×10-6, thermal conductivity 0.097J/cm·sec·°C and electrical resistivity 50 ohm-cm.