La2O3对MgO-Mg2SiO4质耐火材料力学性能及抗渣侵蚀性的影响

doi:10.3969/j.issn.1001-1935.2025.02.004

耐火材料 ›› 2025, Vol. 59 ›› Issue (2): 111-117.DOI: 10.3969/j.issn.1001-1935.2025.02.004

La₂O₃对MgO-Mg₂SiO₄质耐火材料力学性能及抗渣侵蚀性的影响

韦锦涛¹⁾, 罗益欣¹⁾, 杨博林¹⁾, 刘正龙¹⁾, 邓骆鹏²⁾余超¹⁾, 邓承继¹⁾, 王周福¹⁾, 丁军¹⁾

1)武汉科技大学先进耐火材料全国重点实验室湖北武汉 430081
2)中冶武汉冶金建筑研究院有限公司湖北武汉 430080

收稿日期:2024-09-06 出版日期:2025-04-15 发布日期:2025-04-14
通讯作者: 丁军,男,1982年生,博士,教授。E-mail:dingjun@wust.edu.cn
作者简介:韦锦涛:男,1998年生,硕士。E-mail:1565618564@qq.com
基金资助:
湖北省重点研究计划(2022BEC023)。

Effect of La₂O₃ on mechanical properties and slag corrosion resistance of MgO-Mg₂SiO₄ refractories

Wei Jintao, Luo Yixin, Yang Bolin, Liu Zhenglong, Deng Luopeng, Yu Chao, Deng Chengji, Wang Zhoufu, Ding Jun

First author’s address:State Key Laboratory of Advanced Refractories,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Received:2024-09-06 Online:2025-04-15 Published:2025-04-14

摘要/Abstract

摘要： 为解决天然Mg₂SiO₄中杂质生成的低熔点相导致MgO-Mg₂SiO₄质材料抗渣性下降的问题,以La₂O₃为添加剂,Mg₂SiO₄与电熔镁砂为主要原料制备MgO-Mg₂SiO₄质耐火材料,研究了La₂O₃添加量(质量分数分别为0、1%、2%、3%)对MgO-Mg₂SiO₄质耐火材料物相组成、显微结构、力学性能以及抗渣(NaF与Na₂SO₄)侵蚀性能的影响,并结合热力学计算揭示了侵蚀过程中材料物相变化规律。结果表明:在MgO-Mg₂SiO₄质耐火材料中添加适量La₂O₃可以促进材料烧结,提升材料的致密度。当La₂O₃的添加量达到2%(w)时,试样的显气孔率最低,耐压强度最高,材料的抗NaF与Na₂SO₄侵蚀性能也得到了显著改善。

关键词: Mg₂SiO₄, La₂O₃, 抗侵蚀性能, 力学性能

Abstract: The formation of low melting point phases from impurities in natural Mg₂SiO₄ reduces the slag resistance of MgO-Mg₂SiO₄ materials.To solve the problem,MgO-Mg₂SiO₄ refractories were prepared using Mg₂SiO₄ and fused magnesia as main raw materials,and La₂O₃ as an additive.The effects of the La₂O₃ addition (0,1%,2% and 3%,by mass) on the phase composition,microstructure,mechanical properties and slag corrosion resistance (e.g.,against NaF and Na₂SO₄) of the refractories were studied.The phase transformation law of the materials during corrosion was revealed combined with thermodynamic calculations.The results show that an appropriate addition of La₂O₃ can promote sintering and improve the density of the MgO-Mg₂SiO₄ materials.The sample with 2% La₂O₃ has the lowest apparent porosity and the highest cold compressive strength as well as significantly improved resistance against NaF and Na₂SO₄ corrosion.

Key words: Mg₂SiO₄, La₂O₃, corrosion resistance, mechanical properties

中图分类号:

TQ175

韦锦涛, 罗益欣, 杨博林, 刘正龙, 邓骆鹏余超, 邓承继, 王周福, 丁军. La₂O₃对MgO-Mg₂SiO₄质耐火材料力学性能及抗渣侵蚀性的影响[J]. 耐火材料, 2025, 59(2): 111-117.

Wei Jintao, Luo Yixin, Yang Bolin, Liu Zhenglong, Deng Luopeng, Yu Chao, Deng Chengji, Wang Zhoufu, Ding Jun. Effect of La₂O₃ on mechanical properties and slag corrosion resistance of MgO-Mg₂SiO₄ refractories[J]. Refractories, 2025, 59(2): 111-117.

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La₂O₃对MgO-Mg₂SiO₄质耐火材料力学性能及抗渣侵蚀性的影响

Effect of La₂O₃ on mechanical properties and slag corrosion resistance of MgO-Mg₂SiO₄ refractories

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