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硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3280-3288.DOI: 10.16552/j.cnki.issn1001-1625.2026.0124

• 陶瓷及玻璃 • 上一篇    下一篇

锰离子扩散增强镁铝尖晶石陶瓷结构和力学性能研究

玄松桐1(), 孔祥辰2, 王凯悦2, 田玉明2()   

  1. 1.山西工程科技职业大学智能制造学院,太原 030000
    2.太原科技大学材料科学与工程学院,太原 030000
  • 收稿日期:2026-02-02 修订日期:2026-03-30 出版日期:2026-09-15 发布日期:2026-10-09
  • 通信作者: 田玉明,博士,教授。E-mail:tym1654@126.com
  • 作者简介:玄松桐(1996—),男,博士,讲师。主要从事陶瓷材料的研究。E-mail:xsttykjdx@163.com
  • 基金资助:
    山西省科技重大专项(20181101001);山西省高层次人才引进科研启动项目(RCK202437-1);晋城市重点研发项目(20220102);山西工程科技职业大学校级项目(KJ202417)

Structure and Mechanical Properties of Magnesium Aluminum Spinel Ceramics Strengthened by Manganese Ion Diffusion

XUAN Songtong1(), KONG Xiangchen2, WANG Kaiyue2, TIAN Yuming2()   

  1. 1.College of Intelligent Manufacturing,Shanxi Vocational University of Engineering Science and Technology,Taiyuan 030000,China
    2.School of Materials Science and Engineering,Taiyuan University of Science and Technology,Taiyuan 030000,China
  • Received:2026-02-02 Revised:2026-03-30 Published:2026-09-15 Online:2026-10-09

摘要:

为制备高性能镁铝尖晶石结构陶瓷,本文以铝矾土和菱镁矿为原料,软锰矿为添加剂,采用固相烧结法制备MgAl2O4陶瓷,研究了添加剂对尖晶石结构的影响,阐释了锰离子对杂相的作用规律,揭示了锰离子扩散效应增强MgAl2O4材料致密性和力学性能的机理。结果表明,向天然原料中添加软锰矿后,Mn2+固溶至MgAl2O4晶格中,形成(Mn x Mg1-x )Al2O4固溶体,该固溶体减弱了Kirkendall效应,降低了尖晶石生成过程中MgO一侧的气孔率,增强了Mg2+的扩散传质速率,从而提升了材料的致密性和抗折强度。同时,Mn2+与钙长石的反应生成钙锰辉石和Al2O3,引起了辉石晶格畸变,增加了晶格缺陷浓度,提升了离子扩散速率。当软锰矿添加量达到3%(质量分数)时,材料的性能最优,体积密度达到3.29 g/cm3,显气孔率降至0.24%,抗折强度增至140.2 MPa。

关键词: 镁铝尖晶石, 软锰矿, 固相烧结, 离子扩散, 致密性, 力学性能

Abstract:

To prepare high-performance magnesium aluminum spinel structural ceramics, this study used bauxite and magnesite as raw materials and pyrolusite as an additive to prepare MgAl2O4 ceramics via a solid-state sintering method. The effect of the additive on the spinel structure was analyzed, the role of manganese ions in modifying impurity phases was elucidated, and the mechanism by which manganese ion diffusion enhanced the densification and mechanical properties of MgAl2O4 was revealed. The results show that adding pyrolusite to the natural raw materials allow Mn2+ to dissolve into the MgAl2O4 lattice, forming a (Mn x Mg1-x )Al2O4 solid solution. This process weakens the Kirkendall effect, reduces porosity on the MgO side during spinel formation, enhances the diffusion and mass transfer rate of Mg2+, and improves the densification and flexural strength of the samples. Meanwhile, the reaction between Mn2+ and anorthite generates johannsenite and Al2O3, which induces lattice distortion in the pyroxene, increases the concentration of lattice defects, and further promotes the ions diffusion rate. When the pyrolusite addition reaches 3% (mass fraction), the bulk density of the material reaches 3.29 g/cm3, the apparent porosity decreases to 0.24%, and the flexural strength increases to 140.2 MPa.

Key words: magnesium aluminum spinel, pyrolusite, solid-phase sintering, ion diffusion, densification, mechanical property

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