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MnO对Ca2Mg2Al28O46材料结构和性能的影响
作者:  顾华志   张美杰 罗志安 
单位:(武汉科技大学 省部共建耐火材料与冶金国家重点实验室 武汉 430081) 
关键词:一氧化锰 固相烧结 磁铅石结构 热学性能 
分类号:TU528
出版年,卷(期):页码:2019,47(5):0-0
DOI:
摘要:

 采用固相烧结法制备了含不同比例MnO的Ca2Mg2Al28O46材料,研究了材料的烧结性能、显微结构和热学性能。结果表明:1 650 ℃下Mn2+取代Mg2+固溶进入MgAl2O4晶格形成Mg1–xMnxAl2O4同构尖晶石固溶体,进而扩散进入Ca2Mg2Al28O46,产生畸变的磁铅石结构,使晶粒形貌从六方片层状向等轴状发展,并加快了材料的致密化进程。含不同添加量MnO的Ca2MgAl28O46材料1 750 ℃热处理后的体积密度为3.21~3.33 g/cm3,闭口气孔率在0.4%~1.1%。随着MnO含量的增加,材料的热膨胀系数略有增大,但热导率明显提高,添加2 %(质量分数)MnO试样的热膨胀系数由8.94×10–6/K增加到9.41×10–6/K,热导率由1.49 W/(m•K)增加到2.70 W/(m•K)。

  Ca2Mg2Al28O46 materials with different ratios of MnO were prepared via solid-state reaction sintering. The sintering properties, microstructure and thermal properties of the material were investigated. The results show that Mn2+ solid-dissolves into MgAl2O4 lattice by substitution of Mg2+ to form Mg1–xMnxAl2O4 solid solution at 1 650 ℃, and then diffuses into Ca2Mg2Al28O46, resulting in a distorted magnetoplumbite structure and drives the grain morphology from hexagonal to equiaxed. The addition of MnO accelerates the densification of the material, the bulk density of Ca2Mg2Al28O46 materials with different additions of MnO is 3.21–3.33 g/cm3, the closed porosity is 0.4%–1.1% after heat treatment at 1 750 ℃. The thermal expansion coefficient of the materials increases slightly and the thermal conductivity increases with the increase of MnO content. The thermal expansion coefficient of materials increases from 8.94×10–6/K to 9.41×10–6/K and the thermal conductivity increases from 1.49 W/(m•K) to 2.70 W/(m•K) at the addition of 2 % (in mass fraction) MnO.

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