The Combustion Synthesis Process of Al-Ti-C System in an Elevated-temperature Al-melt
摘要
One of the main disadvantages of combustion synthesis of ceramic/metal composite materials is the relatively high level of porosity present in the products.To synthesize TiC/Al composites with a dense structure,this paper proposes a novel application of an elevated-temperature Al-melt to directly ignite and simultaneously infiltrate Al-Ti-C preform dipped in the melt.The emphasis was placed on the combustion synthesis process and microstructural evalution of the preform in the melt,by a liquid quenching test combined with the measurement of the temperature history of the dipped preform.The results show that the combustion synthesis process of the preform in the elevated-temperature melt involves a series of reactions,and that higher temperature of the melt is favourable for the formation of TiC.The synthesized TiC/Al composites exhibit a dense structure,which is attributed to the infiltration of the melt into the preform.