Synthesis and Functional Evaluation of Sulfides : Application of Solid Lubricant and Thermoelectric Material

Sufides as MoS2 are known as solid lubricants. These materials are also known as thermoelectric materials. However, there is no material satisfying both functions at the same time. In this study, sulfides powders such as Cu2S (chalcocite), TiS2, SnS, Cu5FeS4 (bornite) were synthesized under vacuum condition. Some specimens of sintered sulfides were evaluated by friction tester and their lubricity. As a result it was found that SnS had indicated better friction properties. Other specimens were evaluated in terms of Seebeck coefficients, which is one of the thermoelectric properties. Experimental results of the Seebeck coefficients were compared with simulation results. For thermoelectric properties, the　Seebeck coefficient of Cu2S had matched with experiments and simulation. Totally, Cu2S (chalcocite) and SnS has superior properties both, as solid lubricant as well as thermoelectric material.This is a product of research which was financially supported in part by the Kansai University Subsidy for Supporting Young Scholars, 2016 – \u27Study on sulfide synthesis of superior solid lubricity and thermoelectric properties\u2