Safety and possibility of CVD Diamond Experiment in Manned Space-Craft

Abstract

CVD (Chemical Vapor Deposition) film synthesis under microgravity environment is interesting, because microgravity greatly influences thermal convection of vapor. However, there are some difficulties for CVD experiments in such a microgravity environment as space. The most serious problem is disposition of exhaust gas. In this paper, diamond thin film was synthesized as a terrestrial feasibility study in a closed CVD apparatus to deal with the above problem. As a result, we found that the size of reaction chamber and reaction time are very important. On the basis of the results, a case study for diamond thin film synthesis in space is examined.