The Synthesis of Titanium Aluminide with Carbon Addition as a High Coefficient of Thermal Expansion Fiber Utilizing Plasma-Assisted Chemical Vapor Deposition

新型高膨胀、热稳定的复丝纤维增强材料是复合材料发展的关键。研究表明，碳渗钛铝化物是一种非常理想的高膨胀系数、热稳定材料，可用于增强铝化物金属间化合物等基材。传统的纤维成形方法，包括热化学气相沉积(CPD)，并没有产生所需的碳化钛铝化物成分。最近，等离子体辅助化学气相沉积(PACVD)已被证明在石墨、石英和钼丝的复丝衬底上产生了铝化物金属间化合物颗粒和TiB_2、碳化硅和TiC复丝纤维。本文研究了PACVD法在复丝石墨等衬底上制备碳纤维包裹的铝化钛的工艺。将金属蒸发和化学气相沉积相结合，在等离子体中合成碳化钛铝化物作为纤维材料。

New high expansion thermally stable multifilament fiber reinforcements are key to developing significant advances in composite materials. It has been identified that titanium aluminides allayed with carbon is a highly desirable high coefficient of thermal expansion, thermally stable materials for reinforcing aluminide intermetallics and other matrices. Conventional fiber forming methods including thermal chemical vapor deposition (CPD) has not produced the desired composition of titanium aluminide allayed with carbon. Recently plasma assist CVD (PACVD) has been demonstrated to produce aluminide intermetallic particles and multifilament fibers of TiB2, SiC and TiC on multifilament substrates of graphite, quartz and molybdenim wire. The PACVD process is explored here to produce titanium aluminide allayed with carbon fibers on multifilament substrates of graphite and other substrates. Metal evaporation and CVD are combined in a plasma to synthesize titanium aluminide allayed with carbon as a fiber material.