耐火材料 ›› 2021, Vol. 55 ›› Issue (1): 17-20.DOI: 10.3969/j.issn.1001-1935.2021.01.004

• 研究开发 • 上一篇    下一篇

MgO-MA-Al材料MgO致密层的形成及其抗渣性

高耸(), 王晓雨, 张举, 穆元冬, 叶国田()   

  1. 河南省高温功能材料重点实验室 郑州大学材料科学与工程学院 河南郑州 450001
  • 收稿日期:2020-06-21 出版日期:2021-02-15 发布日期:2021-02-15
  • 通讯作者: 叶国田,男,1958年生,教授。E-mail: gtyezzu@qq.com
  • 作者简介:高耸:男,1985年生,博士研究生。E-mail: gsong1314@qq.com
  • 基金资助:
    国家自然科学基金资助项目(5157244);国家自然科学基金资助项目(U1604252)

Formation of MgO dense layer and slag resistance of MgO-MA-Al materials

Gao Song(), Wang Xiaoyu, Zhang Ju, Mu Yuandong, Ye Guotian()   

  1. Henan Key Laboratory of High Temperature Functional Ceramics,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China
  • Received:2020-06-21 Online:2021-02-15 Published:2021-02-15
  • Contact: Ye Guotian

摘要:

以电熔镁砂、电熔尖晶石和金属铝为原料,酚醛树脂为结合剂,制成MgO-MA和含有5%(w)金属Al的MgO-MA-Al试样。在110 ℃干燥24 h后,一部分试样在密闭匣钵中于1 600 ℃保温5 h热处理,分析其物相组成和显微结构;另一部分试样于氮气气氛1 600 ℃保温5 h进行抗钢渣试验。结果表明:1)在密闭匣钵于1 600 ℃保温5 h热处理过程中,含有5%(w)金属Al的MgO-MA-Al试样因强还原性单质Al的存在促进了MgO向Mg(g)转化,从而促进MgO致密层的形成。2)在氮气气氛1 600 ℃保温5 h进行抗渣试验的过程中,同样会发生试样外层致密化的过程。这使试样的抗渣渗透性和抗渣侵蚀性得到提高。

关键词: MgO-MA-Al复合材料, MgO致密层, 氧分压, 抗渣性

Abstract:

MgO-MA samples and MgO-MA-Al samples containing 5 mass% metal Al were prepared using fused magnesia,fused spinel and aluminum as raw materials and phenolic resin as the binder.After drying at 110 ℃ for 24 h,some samples were heat treated in a closed sagger at 1 600 ℃ for 5 h to analyze their phase composition and microstructure;the other samples were tested for slag resistance at 1 600 ℃ in nitrogen atmosphere for 5 h.The results show that (1)a MgO dense layer is formed on the MgO-MA-Al sample containing 5 mass% Al since the strong reducing Al promotes the transformation of MgO to Mg gas during the heat treatment in the closed sagger at 1 600 ℃ for 5 h under nitrogen atmosphere;(2)in the process of the slag resistance test at 1 600 ℃ for 5 h in nitrogen atmosphere,the outer layer of the sample is also densified,which improves the slag penetration resistance and the slag corrosion resistance of the samples.

Key words: magnesia-spinel-aluminum composite, magnesia dense layer, oxygen partial pressure, slag resistance

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