耐火材料 ›› 2021, Vol. 55 ›› Issue (2): 107-110.DOI: 10.3969/j.issn.1001-1935.2021.02.004

• 研究开发 • 上一篇    下一篇

升温制度对Al-MgO-Al2O3耐火材料物相组成及显微结构的影响

赵臣瑞1)(), 孙洋2), 牛智旺1), 李勇2), 李宏宇1), 梁保青1)   

  1. 1)河南熔金高温材料股份有限公司 河南卫辉 453100
    2)北京科技大学 材料科学与工程学院 北京 100083
  • 收稿日期:2020-07-06 出版日期:2021-04-15 发布日期:2021-04-15
  • 作者简介:赵臣瑞:男,1987年生,硕士,工程师。E-mail:13782510823@126.com
  • 基金资助:
    国家自然科学基金资助项目(51872023)

Influence of heating schedule on phase composition and microstructure of Al-MgO-Al2O3 refractories

Zhao Chenrui1)(), Sun Yang2), Niu Zhiwang1), Li Yong2), Li Hongyu1), Liang Baoqing1)   

  1. 1)Henan Rongjin High Temperature Materials Co.,Ltd.,Weihui 453100,Henan,China
  • Received:2020-07-06 Online:2021-04-15 Published:2021-04-15

摘要:

以金属Al粉、电熔镁砂和电熔棕刚玉为原料,热固性酚醛树脂为结合剂,制备了Al-MgO-Al2O3耐火材料试样。在空气条件下以两种升温制度对其进行热处理:1)直接升温至1 500 ℃保温2 h;2)先升温至580 ℃保温2 h后再升温至1 500 ℃保温2 h。利用XRD、SEM等探究了升温制度对材料相组成及显微结构的影响。结果表明:1)直接升温至1 500 ℃热处理后,材料中生成的非氧化物相主要为Al4O4C;2)580 ℃保温2 h有利于金属铝在高温下以Al2O(g)的形式参与反应,进而使材料中生成(Al2OC)x(AlN)1-x纤维;3)先580 ℃保温再 1 500 ℃热处理后材料中形成了以镁铝尖晶石和(Al2OC)x(AlN)1-x纤维为主成分的致密层。

关键词: 升温制度, Al-MgO-Al2O3耐火材料, (Al2OC)x(AlN)1-x, 相组成, 显微结构

Abstract:

Al-MgO-Al2O3 refractory specimens were prepared using Al powder,fused magnesia and fused brown alumina as raw materials,and thermosetting phenolic resin as binder.Two heating schedules were used for heat treatment in air:1)direct heating to 1 500 ℃ and holding for 2 h;2)heating to 580 ℃ and holding for 2 h and then heating to 1 500 ℃ and holding for 2 h.The influence of the heating schedule on the phase composition and microstructure of the specimens was studied by XRD and SEM.The results show that:1)after heating directly to 1 500 ℃,the non-oxide formed in the specimen is mainly Al4O4C;2)first holding at 580 ℃ for 2 h is beneficial to transforming Al into Al2O(g) at high temperatures to produce (Al2OC)x(AlN)1-x whiskers in the specimen;3)after the heat treatment at 1 500 ℃ following the 580 ℃ treatment,a dense layer with magnesium aluminate spinel and (Al2OC)x(AlN)1-x whiskers as the main phases is formed in the material.

Key words: heating schedule, aluminium-magesia-alumina refractories, (Al2OC)x(AlN)1-x, phase composition, microstructure

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