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

新型高膨胀热稳定多长丝纤维增强材料是复合材料取得重大进展的关键。用碳合金化的钛铝化物是一种非常理想的热膨胀系数高、热稳定的材料，用于增强铝化物金属间化合物和其他基体。包括热化学气相沉积（CPD）在内的传统纤维成型方法无法生产出所需的碳合金化铝化钛成分。近年来，等离子辅助化学气相沉积（PACVD）技术在石墨、石英和钼丹丝的多丝衬底上制备了铝化物金属间颗粒和TiB2、SiC和TiC多丝纤维。采用PACVD工艺在石墨和其他衬底的多丝衬底上制备碳纤维铝化钛。在等离子体中结合金属蒸发和气相沉积，合成了以碳为纤维材料的铝化钛。

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.