Preparation and Bending Strength of Micro-Laminated TiC/Ti Composites

Abstract

Ceramic materials have some shortcomings such as intrinsic brittleness and poor reliability, which limit the application in the field of structure. The laminated composites are composed by ceramics and metals according to the principle of bionics, and the advantages of metals and ceramics can be excellently utilized to greatly improve the toughness and reliability of ceramic materials. At present, most of the methods are to prepare ceramic layers by using ceramic powders. This methods have the disadvantages of long preparation cycles and weak interface between ceramic and metal, and thus it is necessary to find a new synthesis method. Micro-laminated TiC/Ti composites were prepared by in-situ synthesis using Ti foils and graphite papers in this paper. The SPS and hot-pressing sintering were used respectively, and the microstructure and mechanical properties of the composite were compared. By comparison, the layered structure was obviously found after SPS and hot-press sintering at 1400°C, but much residues C affected the mechanical properties; Due to the middle of Ti melting after SPS sintering at 1500°C, the laminated structure could not be completely formed resulting in low strength. The laminated structure was well formed by hot-pressing sintering at 1500°C, and the micro-laminated TiC/Ti composite exhibited bending strength of 665.8±18MPa and fracture toughness of 23.81±1.2MPa·m1/2. However, the two sintering methods still need to be optimized.