Influence of lithium feldspar content on erosion-resistant coating performance for the sintering of layered oxides

doi:10.3969/j.issn.1001-1935.2026.03.007

Abstract

Abstract: To address the issue of structural pulverization of cordierite-mullite system crucibles in high-temperature alkaline environments,a Li₂O-Al₂O₃-SiO₂-TiO₂ high-temperature erosion-resistant coating was developed by using tabular alumina,zircon sand,Guangxi white mud,and titanium dioxide as raw materials and adjusting the glaze slurry formula by introducing spodumene at mass fractions of 0,25%,30%,35%,and 40%.The coating was sprayed onto a mullite-cordierite substrate to prepare a densified erosion-resistant coating.The results showed that the spodumene in the coating enhanced the crucible's erosion resistance by promoting the formation of mullite crystal columns encapsulated by the liquid phase formed by leucite and β-quartz.Additionally,the sodium aluminosilicate phase interface reaction layer formed on the coating surface during the sintering of the cathode material precursor further improved the crucible's erosion resistance.Moreover,the crucible with a 25% (w) spodumene introduction in the coating formula achieved a composite strength of 14.3 MPa,which was higher than that of crucibles with other coating formulas.The apparent porosity of the substrate was reduced by 18.5% compared to the sample without spodumene introduction.After 30 high-temperature cycles,the substrate structure remained intact without any signs of crack propagation.This coating technology can extend the service life of the crucible by more than three times,providing an economically viable and engineering-applicable solution for the interface protection of high-corrosion cathode material sintering equipment.

Key words: Saggar, Coating, Lithium feldspar, Anti-erosion

摘要： 针对堇青石-莫来石体系匣钵在高温热碱侵蚀环境中易结构粉化的问题,以板状刚玉、锆英砂、广西白泥和二氧化钛为原料,通过引入锂辉石(质量分数分别为0、25%、30%、35%、40%)调控釉浆配方,构建了Li₂O-Al₂O₃-SiO₂-TiO₂体系高温抗侵蚀涂层,喷涂于莫来石-堇青石质基体上,经1 345 ℃保温4 h热处理制备致密化抗侵蚀涂层。结果表明:涂层中的锂辉石通过促进透锂长石与β -方石英所形成液相包裹的莫来石晶柱的形成,增强了匣钵的抗侵蚀性,同时在正极材料前驱体烧结过程中涂层表面形成的硅铝酸钠相界面反应层进一步提升匣钵的抗侵蚀性;此外,锂辉石引入量为25%(w)的匣钵的复合强度达到14.3 MPa,较其他配方涂层的匣钵均有提升,基体显气孔率较未引入锂辉石的试样降低18.5%;30次高温循环后仍保持基体结构完整性,无裂纹扩展迹象;该涂层技术可将匣钵使用寿命延长3倍以上,为高腐蚀性正极材料烧结装备的界面防护提供了兼具经济效益与工程适用性的解决方案。

关键词: 匣钵, 防护涂层, 锂辉石, 抗侵蚀性

CLC Number:

TQ175

Su Yuming, Wang Yilong, Zhu Zishuo, Yang Lianti, Liu Qinghua, Qing Da, Wang Jian, Wu Feng, Han Lu. Influence of lithium feldspar content on erosion-resistant coating performance for the sintering of layered oxides[J]. Refractories, 2026, 60(3): 221-226.

苏钰洺, 王义龙, 朱子硕, 杨连弟, 刘清华, 庆达王健, 吴锋, 韩露. 锂辉石优化堇青石-莫来石质匣钵抗侵蚀涂层的研究[J]. 耐火材料, 2026, 60(3): 221-226.

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URL: http://www.nhcl.cn/EN/10.3969/j.issn.1001-1935.2026.03.007

http://www.nhcl.cn/EN/Y2026/V60/I3/221

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