耐火材料 ›› 2021, Vol. 55 ›› Issue (5): 430-434.DOI: 10.3969/j.issn.1001-1935.2021.05.012

• 研究发展 • 上一篇    下一篇

Al粉、Si粉复合低碳稳定镁钙材料的抗氧化性

高正霞(), 陶梦雅, 刘伟, 孟维, 马成良(), 钟香崇   

  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
  • 收稿日期:2021-07-15 出版日期:2021-10-15 发布日期:2021-10-25
  • 通讯作者: 马成良,男,1967 年生,博士,教授。 E-mail: machengliang@zzu.edu.cn
  • 作者简介:高正霞:女,1997年生,硕士研究生。E-mail: gzx1909275216@163.com
  • 基金资助:
    国家自然科学基金资助项目(51472220,51872265)

Oxidation resistance of Al/Si composite low-carbon stabilized MgO-CaO materials

Gao Zhengxia(), Tao Mengya, Liu Wei, Meng Wei, Ma Chengliang(), Zhong Xiangchong   

  1. Henan Key laboratory of High Temperature Functional Ceramics,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450052,Henan,China
  • Received:2021-07-15 Online:2021-10-15 Published:2021-10-25
  • Contact: Ma Chengliang

摘要:

为提高耐火材料资源的综合利用率,以自制的稳定镁白云石合成料、电熔镁砂、Al粉、Si粉和鳞片石墨为原料,制备了Al粉、Si粉复合低碳稳定镁钙试样,研究了Al粉和Si粉复合低碳稳定镁钙材料的抗氧化性能,并探究了材料的抗氧化性能与物相组成和显微结构之间的关系。结果表明:1)加入金属Al粉和Si粉的抗氧化机制表现为明显的保护性氧化。2)1 000和1 500 ℃各氧化3 h后,未加入Al粉、Si粉的试样完全氧化。含Al粉、Si粉的试样氧化层厚度减小,抗氧化性提高。加入Al粉可有效地提高材料的抗氧化性,Al粉的最适宜加入量为4%(w),仅加入Si粉的试样氧化层厚度变化不明显。综合分析,最优配比为Al粉与Si粉均加入4%(w)。3)Al粉、Si粉氧化后分别生成的Al2O3和SiO2,与材料中的方镁石和硅酸钙反应生成镁铝尖晶石、镁硅钙石(镁蔷薇辉石)和钙镁橄榄石等物相,使材料的内部结构更加致密,提高了材料的抗氧化性能。

关键词: Al粉, Si粉, 稳定镁白云石, 抗氧化性

Abstract:

In order to improve the comprehensive utilization of refractory resources,the self-made stabilized magnesia dolomite composite material,fused magnesia,Al powder,Si powder,and flake graphite were used as raw materials to study the oxidation resistance of Al/Si composite low-carbon stabilized MgO-CaO materials,and to explore the relationship among the oxidation resistance,the phase composition and the microstructure.The results show that:(1)the oxidation mechanism of materials with Al/Si powder is obviously protective oxidation;(2)after oxidizing at 1 000 and 1 500 ℃ for 3 h respectively,the specimens without Al/Si powder are completely oxidized;the oxide layer thickness of the specimens with Al/Si powder reduces,and the oxidation resistance improves;the addition of Al powder can effectively improve the oxidation resistance of the material,the optimal Al powder addition is 4 mass%;the oxide layer thickness of the specimens with only Si powder does not change significantly.Comprehensive analysis shows that the optimal ratio is 4 mass% for Al powder or Si powder;(3)Al2O3 and SiO2 are generated after oxidation of Al/Si powder,which react with periclase and calcium silicate in the material to form magnesium aluminate spinel,merwinite (magnesite pyroxene),monticellite,etc.,densifying the materials and enhancing the oxidation resistance.

Key words: aluminum powder, silicon powder, stabilized magnesia dolomite, oxidation resistance

中图分类号: