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采用球磨后放电等离子体烧结的方法制了化学成分为Mn3Ga1-xSnxN(x=0,0.1,0.2,0.3,0.4)的反钙钛矿锰氮化合物。研究了其热膨胀性能、导热性能和力学性能。结果表明:所有样品热膨胀性能与Sn含量有关,随着Sn含量的增加,负热膨胀温区向高温移动。其中,Mn3Ga0.9Sn0.1N化合物在279到338 K温区内的负热膨胀系数为–27.5×10-6 K-1,负热膨胀温区宽度为59 K。而Mn3Ga0.6Sn0.4N在363~400K温区内的热膨胀系数较小,接近零膨胀。此外,这类负热膨胀材料的热导率约为3.2 W·(m·K)-1,压缩强度约为210 MPa。
The anti-perovskite manganese-nitrogen compound with the chemical composition of Mn3Ga1-xSnxN (x = 0,0.1,0.2,0.3,0.4) was prepared by ball milling and discharge plasma sintering. The thermal expansion, thermal conductivity and mechanical properties were studied. The results show that the thermal expansion properties of all samples are related to the Sn content. With the increase of Sn content, the negative thermal expansion temperature region moves to high temperature. Among them, the negative thermal expansion coefficient of Mn3Ga0.9Sn0.1N in the temperature range from 279 to 338 K is -27.5 × 10-6 K-1, and the width of negative thermal expansion temperature is 59 K. However, the thermal expansion coefficient of Mn3Ga0.6Sn0.4N in the temperature range of 363K to 400K is small, nearly zero. In addition, the thermal conductivity of this type of negative thermal expansion material is about 3.2 W · (m · K) -1 and the compressive strength is about 210 MPa.