改性SiO2源对合成高纯莫来石材料结构及性能的影响

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (10): 3265-3272.

改性SiO₂源对合成高纯莫来石材料结构及性能的影响

李可可¹, 朱先忠², 麦海香¹, 周超杰³, 徐恩霞¹, 刘新红¹, 赵飞¹

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,郑州 450052;
2.中国石油天然气管道科学研究院有限公司,廊坊 065000;
3.河南省产品质量监督检验院,郑州 450047

收稿日期:2021-07-29 修回日期:2021-09-07 出版日期:2021-10-15 发布日期:2021-11-11
通讯作者: 赵飞,博士,工程师。E-mail:zhaofeiln@zzu.edu.cn
作者简介:李可可(1997—),女,硕士研究生。主要从事高温功能材料的研究。E-mail:732314436@qq.com
基金资助:
国家自然科学基金(51872266)

Effect of Modified SiO₂ Source on Structure and Properties of High-Purity Mullite Materials

LI Keke¹, ZHU Xianzhong², MAI Haixiang¹, ZHOU Chaojie³, XU Enxia¹, LIU Xinhong¹, ZHAO Fei¹

1. Henan Key Laboratory of High Temperature Functional Ceramics,School of Material Science and Engineering, Zhengzhou University, Zhengzhou 450052, China;
2. China Petroleum Pipeline Research Institute Co., Ltd,Langfang 065000, China;
3. Henan Institute of Product Quality Supervision and Inspection, Zhengzhou 450047, China

Received:2021-07-29 Revised:2021-09-07 Online:2021-10-15 Published:2021-11-11

摘要/Abstract

摘要： 在天然石英中引入质量分数为8%的γ-Al₂O₃,经1 550 ℃加热处理实现了对SiO₂源的掺杂改性。以不同SiO₂源和γ-Al₂O₃为原料,对比研究了改性SiO₂源对合成高纯莫来石材料结构和性能的影响。结果表明:SiO₂中掺入少量γ-Al₂O₃后,其熔融温度降低;改性SiO₂源在较窄的温度范围(1 570~1 580 ℃)内转化为富SiO₂液相。大量富SiO₂液相的形成促进了莫来石化反应,加速了颗粒重排,提高了材料的致密度,从而改善了高纯莫来石材料的反应烧结性能。在煅烧过程中,富SiO₂液相逐渐被反应消耗转化为高温相的莫来石;同时,改性SiO₂源熔融提供的液相环境,促进了莫来石晶体的各向异性生长。经1 700 ℃保温3 h煅烧后,莫来石晶体发育呈柱状并形成交叉的网络结构,增强了晶体间的结合程度。采用改性SiO₂源合成的高纯莫来石材料,表现出更好的力学性能。

关键词: 改性SiO₂源, γ-Al₂O₃, 高纯莫来石, 富SiO₂液相, 烧结性能, 耐压强度

Abstract: To assess the effects of modified SiO₂ sources on the structure and properties of high-purity mullite materials by reactive sintering method, the modified SiO₂ source was fabricated by doping 8% (mass fraction) γ-Al₂O₃ into natural quartz and heating at 1 550 ℃. Subsequently, mullite samples were prepared by using different SiO₂ sources and γ-Al₂O₃ as raw materials. The results show thatthe melting temperature of SiO₂ decreases after adding a small amount of γ-Al₂O₃. The modified SiO₂ sources are transformed into a large amount of SiO₂-rich liquid phase in a narrow temperature range (1 570 ℃ to 1 580 ℃). The formation of a large amount of SiO₂-rich liquid phase promotes the mulliteization reaction, accelerates the particle rearrangement, increases the density of materials, and improves the reaction sintering property of high-purity mullite materials. During the calcination process, the SiO₂-rich liquid phase is gradually consumed by the reaction and converted into high-temperature mullite. Meanwhile, the liquid phase environment provided by the melting of modified SiO₂ source promotes the anisotropic crystal growth of mullite. After calcination at 1 700 ℃ for 3 h, the obtained mullite grains morphology exhibits columnar shape and forms a cross network structure, which enhances the degree of bonding between crystals. Therefore, high-purity mullite materials with the modified SiO₂ sources exhibit higher density and better mechanical properties.

Key words: modified SiO₂ source, γ-Al₂O₃, high-purity mullite, SiO₂-rich liquid phase, sintering property, compressive strength

中图分类号:

TQ175

李可可, 朱先忠, 麦海香, 周超杰, 徐恩霞, 刘新红, 赵飞. 改性SiO₂源对合成高纯莫来石材料结构及性能的影响[J]. 硅酸盐通报, 2021, 40(10): 3265-3272.

LI Keke, ZHU Xianzhong, MAI Haixiang, ZHOU Chaojie, XU Enxia, LIU Xinhong, ZHAO Fei. Effect of Modified SiO₂ Source on Structure and Properties of High-Purity Mullite Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3265-3272.

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改性SiO₂源对合成高纯莫来石材料结构及性能的影响

Effect of Modified SiO₂ Source on Structure and Properties of High-Purity Mullite Materials

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