C3H8-H2混合ガスによるTi-6Al-4V合金のプラズマ浸炭

概要

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Plasma-carburizing using the glow discharge of hydrocarbon gases produces a high concentration of carbon in the surface layer within a short period of time. It has thus been frequently applied industrially to ferrous materials to concentrate carbon content in the case region or to produce a greater case depth. The authors have conducted a series of studies on the plasma-carburizing of transition metals belonging to groups IVa∼VIa, such as titanium and tungsten. In this study, Ti-6Al-4V alloy was plasma-carburized to investigate the process of formation of titanium carbides and their mechanical properties after treatment. The following results were obtained. 1) A fine carbide layer consisting of TiC and having a hardness of Hv 2140 was formed in the surface and a carbon diffusion layer was formed beneath this carbide layer. 2) The rate of growth of the carbide layer was proportional to the 1/2th power of treatment time. 3) In cases where an amorphous carbon layer was formed on the surface, the growth of carbide layer was markedly slowed down.
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