耐火材料 ›› 2022, Vol. 56 ›› Issue (4): 315-319.DOI: 10.3969/j.issn.1001-1935.2022.04.009

• 研究开发 • 上一篇    下一篇

ZrO2隔离层对铝酸镧基高发射率涂层物相组成和显微结构的影响

张一帆, 王刚, 王曲, 张琪, 王来稳, 黄振武, 张雷   

  1. 中钢集团洛阳耐火材料研究院有限公司 先进耐火材料国家重点实验室 河南洛阳 471039
  • 收稿日期:2021-11-16 出版日期:2022-08-15 发布日期:2022-11-09
  • 作者简介:张一帆:女,1994年生,硕士研究生。E-mail:lirrzyf@126.com
  • 基金资助:
    NSFC-河南联合基金资助项目(U1904217);中原科技创新领军人才 项目(224200510006)。

Effect of ZrO2 isolation layer on phase composition and microstructure of lanthanum aluminate high emissivity coating

Zhang Yifan, Wang Gang, Wang Qu, Zhang Qi, Wang Laiwen, Huang Zhenwu, Zhang Lei   

  1. State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China
  • Received:2021-11-16 Online:2022-08-15 Published:2022-11-09

摘要: 为了探究ZrO2隔离层对铝酸镧基高发射率涂层物相组成和显微结构的影响,以纯度(w)均为99%的La2O3、Al2O3、CaCO3和Fe2O3为原料,按照La0.8Ca0.2Al0.8Fe0.2O3的化学计量比,利用固相烧结法制备出Ca2+、Fe3+掺杂的铝酸镧(LaAlO3)粉体。将LaAlO3粉体作为高发射率红外陶瓷粉体辐射剂,再以不同粒度的ZrO2涂层为隔离层,制备出了LaAlO3与ZrO2复合的涂层(LCAFO/ZrO2),并将其与单LCAFO(LaAlO3)涂层分别涂覆在工业窑炉炉衬用Al2O3空心球砖表面。采用XRD、SEM等方法对涂层进行分析。结果表明:LCAFO涂层与Al2O3空心球砖在1 200 ℃时不反应,1 400 ℃时反应生成LaAl11O18,1 600 ℃时,二者反应更加充分;反应层LaAl11O18的厚度随温度的升高逐渐增加。当ZrO2隔离层涂覆于LCAFO层和Al2O3空心球砖之间时,复合涂层煅烧至 1 400 ℃时,无LaAl11O18相生成,无反应层出现。

关键词: 发射率, 铝酸镧, 氧化锆, 隔离层

Abstract: In order to explore the effect of ZrO2 isolation layer on phase composition and microstructure of lanthanum aluminate high emissivity coating,Ca2+ and Fe3+ doped lanthanum aluminate (LaAlO3) powders were prepared using La2O3,Al2O3,CaCO3 and Fe2O3 (all 99% purity) as raw materials via solid phase sintering method according to the stoichiometric ratio of La0.8Ca0.2Al0.8Fe0.2O3.The LaAlO3 and ZrO2 composite coating (LCAFO/ZrO2) were prepared using LaAlO3 powder as the high emissivity infrared ceramic powder radiation agent and ZrO2 coatings with different particle sizes as the isolation layer.The developed coating and the LCAFO (LaAlO3) coating were spread on the surface of bubble Al2O3 bricks for the lining of industrial furnaces,respectively.The coatings were analyzed using XRD and SEM.The results show that LCAFO coating does not react with bubble Al2O3 bricks at 1 200 ℃,but they react at 1 400 ℃ forming LaAl11O18,and the reaction is more sufficient at 1 600 ℃.The thickness of the LaAl11O18 layer increases with the temperature rising.When the ZrO2 isolation layer is coated between the LCAFO layer and the bubble Al2O3 bricks,no LaAl11O18 phase exists and no reaction layer appears at 1 400 ℃.

Key words: emissivity, lanthanum aluminate, zirconia, isolation layer

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