Layered Composite Materials Based on Ti/Ta/Hf/Ceramic for Operation under Extreme Conditions

Ti/Ta/Hf/Ni/ceramic layered composite materials are produced via the self-propagating high-temperature synthesis (SHS) of prestructured samples using metal foils (Ti, Hf, Ta, Ni) and reaction tapes (Ti + 0.65C), (Ti + 1.7B) and (5Ti + 3Si). The reaction tapes are prepared by cold rolling from powder mixtures. The microstructure, and elemental and phase compositions of the synthesized multilayer composite materials are characterized by scanning-electron microscopy (SEM) and X-ray phase analysis. The formation of intermediate layers and modification of the surface of the metal foils is given individual attention. Their flexural strength is determined according to the scheme of three-point loading at temperatures of 25 and 1100degree celsius. Microstructure analysis of the produced materials shows that the joining of the metal foils and reaction tapes in the combustion mode is facilitated due to reaction diffusion, mutual impregnation, and chemical reactions occurring in the reaction tapes and on the surface of metal foils. The formation of thin intermediate layers in the form of cermets and eutectic solutions provides the synthesized multilayer materials with good strength properties (up to 275 MPa at 25degree celsius, up to 72 MPa at 1100degree celsius). These results are of interest for the development of construction materials operating under extreme conditions.