耐火材料

耐火材料 ›› 2026, Vol. 60 ›› Issue (2): 103-107.DOI: 10.3969/j.issn.1001-1935.2026.02.003

• 研究开发 • 上一篇    下一篇

α-Al2O3微粉加入量对镁质坩埚材料结构与性能的影响

张文坷1), 李素平1), 晋一2), 何思瑶1), 马成良1), 刘新红1), 冯润堂3), 田晓利3), 刘百宽3)   

  1. 1)郑州大学 材料科学与工程学院 河南省高温功能材料重点实验室 河南郑州 450052
    2)中共三门峡市委党校 河南三门峡 472000
    3)濮阳濮耐高温材料(集团)股份有限公司 河南濮阳 457100
  • 收稿日期:2025-06-13 出版日期:2026-04-15 发布日期:2026-04-15
  • 通讯作者: 李素平,女,1968年生,博士,教授。E-mail:lisuping@zzu.edu.cn
  • 作者简介:张文坷:男,1998年生,硕士研究生。E-mail:endeavorzwk@163.com
  • 基金资助:
    河南省研究生联合培养基地项目(YJS2024JD03);郑州市协同创新专项(20XTZX12025)。

Effect of α-Al2O3 micropowder addition on structure and properties of magnesia-based crucible materials

Zhang Wenke, Li Suping, Jin Yi, He Siyao, Ma Chengliang, Liu Xinhong, Feng Runtang, Tian Xiaoli, Liu Bai-kuan   

  1. First author’s address:Henan Key Laboratory of High Temperature Functional Ceramics,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450052,Henan,China
  • Received:2025-06-13 Online:2026-04-15 Published:2026-04-15

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摘要： 为改善镁质坩埚材料的性能,以电熔镁砂和α-Al2O3微粉为主要原料,六水氯化镁为结合剂,制备了镁质坩埚材料,研究了α-Al2O3微粉加入量(加入质量分数分别为0、2%、3%、5%和7%)对镁质坩埚材料的物相组成、常温物理性能、高温抗折强度、抗热震性和显微结构的影响。结果表明:少量α-Al2O3微粉的加入与氧化镁形成有限置换型固溶体,引起晶格畸变,提高颗粒间的紧密结合程度,促进试样的烧结;达到固溶极限后,氧化铝与氧化镁原位生成镁铝尖晶石,反应伴随体积膨胀。当α-Al2O3微粉加入量为2%(w)时,其促烧结作用大于生成镁铝尖晶石引起的膨胀作用,试样的常温抗折强度、耐压强度及 1 400 ℃的高温抗折强度最大,分别为24.9、85.1和2.3 MPa,试样经1次和3次风冷后的常温抗折强度最大,分别为12.4和8.3 MPa。

关键词: 镁质坩埚, α-Al2O3微粉, 高温强度, 抗热震性, 显微结构

Abstract: To improve the properties of magnesia-based crucible materials,fused magnesia and α-Al2O3 micropowder were used as main raw materials,and magnesium chloride hexahydrate as the binder to prepare magnesia-based crucible materials.The effects of the α-Al2O3 micropowder addition (0,2%,3%,5% and 7%,by mass) on the phase composition,cold physical properties,hot modulus of rupture,thermal shock resistance and microstructure of the materials were investigated.The results show that the addition of a small amount of α-Al2O3 micropowder forms a limited substitutional solid solution with magnesia,causing lattice distortion,improving the bonding between particles and promoting the sintering of the samples;after reaching the solid solution limit,alumina reacts with magnesia to form magnesium aluminate spinel in-situ,accompanied by volume expansion.When the α-Al2O3 micropowder addition is 2%,the sintering-promoting effect is stronger than the expansion effect caused by the spinel formation,so the sample exhibits the maximum cold modulus of rupture,cold compressive strength and hot modulus of rupture at 1 400 ℃,which are 24.9,85.1 and 2.3 MPa,respectively.The cold modulus of rupture after 1 and 3 cycles of thermal shock by air quenching is also the highest,reaching 12.4 and 8.3 MPa,respectively.

Key words: magnesia-based crucible, α-alumina micropowder, hot strength, thermal shock resistance, microstructure

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