Abstract

AlMgB₁₄-based materials have been synthesized by spark plasma sintering of an Al₁₂Mg₁₇–B powder mixture at 1300 and 1400°C. The phase composition, structure, and properties of these materials have been studied. According to X-ray powder diffraction evidence, spark plasma sintering leads to the formation of the AlMgB₁₄ phase and the MgAl₂O₄ spinel. The content of the AlMgB₁₄ phase in the materials is ~95 wt %. At a sintering temperature of 1400°C, the resulting material has a hardness and relative density of 30.1 GPa and 99.3%, respectively. It has been demonstrated that a major source of oxygen in the powder mixture is a B₂O₃ oxide film on the boron powder surface. Thus, when the Al₁₂Mg₁₇ intermetallic powder is used as a precursor, the reaction of Al_xMg_y intermetallic compounds with B₂O₃ leads to the formation of the MgAl₂O₄ spinel.

中文翻译：

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AlMgB14 陶瓷材料的火花等离子体烧结、相组成和性能

摘要

AlMgB ₁₄基材料是通过在 1300 和 1400°C下对 Al ₁₂ Mg ₁₇ –B 粉末混合物进行放电等离子烧结来合成的。已经研究了这些材料的相组成、结构和性质。根据 X 射线粉末衍射证据，放电等离子体烧结导致形成 AlMgB ₁₄相和 MgAl ₂ O ₄尖晶石。材料中AlMgB ₁₄相的含量为～95wt%。在1400°C的烧结温度下，所得材料的硬度和相对密度分别为30.1 GPa和99.3%。已经证明粉末混合物中氧气的主要来源是 B ₂ O₃硼粉表面的氧化膜。因此，当Al ₁₂ Mg ₁₇金属间化合物粉末用作前体时，Al _x Mg _y金属间化合物与B ₂ O _{3 的反应}导致形成MgAl ₂ O ₄尖晶石。