复合添加MgO和La2O3对纳米微晶氧化铝陶瓷微观结构的影响

摘要/Abstract

摘要： 纳米微晶氧化铝磨料具有良好的通用性和高精度磨削能力,且性价比较高,在机械制造、轴承、模具、汽车等领域有广泛的应用潜力。本研究以勃姆石(γ-AlOOH)为原料,MgO、La₂O₃为添加剂,采用溶胶-凝胶工艺合成纳米微晶氧化铝。通过差示扫描量热仪、X射线衍射仪、扫描电子显微镜和从头算分子动力学方法模拟计算研究了添加剂对微晶氧化铝相转化、物相组成、微观结构及力学性能的影响。结果表明:复合添加MgO和La₂O₃可以使氧化铝中间相θ-Al₂O₃向α-Al₂O₃转化的温度从1 257 ℃降低到1 105 ℃,将致密化温度从1 600 ℃降低到1 350 ℃,将微晶氧化铝的晶粒尺寸从1.04 mm减小到120 nm,实现了低温致密烧结。

关键词: 纳米微晶, Al₂O₃, MgO, La₂O₃, 溶胶-凝胶, 添加剂, 低温烧结

Abstract: The nanocrystalline alumina abrasive, with its excellent versatility and high-precision grinding capability, has become a cost-effective choice for various applications in fields such as mechanical manufacturing, bearings, molds and automobiles. In this study, nano microcrystalline alumina was synthesized by sol-gel process, with boehmite (γ-AlOOH) as raw material, MgO and La₂O₃ as additives. The effects of MgO and La₂O₃ additives on the phase transformation, phase composition, microstructure and mechanical properties of nanocrystalline alumina were investigated by differential scanning calorimetry, X-ray diffraction, scanning electron microscopy and ab initio molecular dynamics simulation. The results show that MgO and La₂O₃ composite additives can reduce the transformation temperature of alumina from the intermediate phase θ-Al₂O₃ to α-Al₂O₃ from 1 257 ℃ to 1 105 ℃, lower the densification temperature of the material from 1 600 ℃ to1 350 ℃, and reduce the grain size of nanocrystalline alumina from 1.04 mm to 120 nm, thus realizing the low-temperature dense sintering.

Key words: nano-microcrystalline, Al₂O₃, MgO, La₂O₃, sol-gel, additive, low-temperature sintering

中图分类号:

TB321

李慧, 张金平, 高景霞, 王二萍, 张洋洋. 复合添加MgO和La₂O₃对纳米微晶氧化铝陶瓷微观结构的影响[J]. 硅酸盐通报, 2024, 43(1): 339-346.

LI Hui, ZHANG Jinping, GAO Jingxia, WANG Erping, ZHANG Yangyang. Effects of MgO and La₂O₃ Composite Additives on Microstructure of Nano-Microcrystalline Alumina Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 339-346.

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复合添加MgO和La₂O₃对纳米微晶氧化铝陶瓷微观结构的影响

Effects of MgO and La₂O₃ Composite Additives on Microstructure of Nano-Microcrystalline Alumina Ceramics

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