Masayoshi Ichigo and Koshi Takenaka
Department of Crystalline Materials Science, Graduate School of Engineering, Nagoya University, Nagoya 464-8603
Plastics have beneficial features of light weight and high workability, but their large thermal expansion emerges as a shortcoming for which reduction is desired in highly advanced industries. The negative thermal expansion (NTE) of antiperovskite manganese nitrides is greater than -30 ppm/K in α (coefficient of linear thermal expansion), which is several to ten times as large as that of conventional NTE materials. The giant NTE of the manganese nitrides can compensate or control large thermal expansion of plastics by forming composites. We attempt to make the fine-grained NTE manganese nitrides for thermal expansion control of light transmitting plastics. In the fine-graining process, NTE of manganese nitrides changed because of a change in the chemical composition. A technique to control NTE and grain size simultaneously is necessary for the manganese nitride filler. [doi:10.2320/jinstmet.JAW201302]
negative thermal expansion, antiperovskite manganese nitride, plastics matrix composite
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