| Budget Amount *help |
¥20,020,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥4,620,000)
Fiscal Year 2009: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2008: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000)
Fiscal Year 2007: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Research Abstract |
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.
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