Development of Zero Thermal Expansion Ceramics using Antiperovskite Manganese Nitrides

点击翻译按钮获取中文摘要

Pure-form zero thermal expansion (ZTE) ceramics have been developed using antiperovskite manganese nitrides Mn_3XN, negative thermal expansion of which can be tunable. Such a ZTE material consisting of one material without thermal expansion has advantages compared to ZTE composites currently in use because the grain boundaries are stable against temperature variation and the fabrication process is simple. The low-cost ZTE was achieved without expensive Ge by optimizing chemical compositions. These manganese nitrides exhibit high stiffness ; Young's modulus exceeds 300GPa, much larger than that of typical thermal-expansion compensators. The present results demonstrate high potentiality of this nitride as a practical ZTE material.