氟化物及制备工艺对高纯氧化铝陶瓷组织形貌的影响

doi:10.16085/j.issn.1000-6613.2017-0848

化工进展 ›› 2018, Vol. 37 ›› Issue (01): 182-188.DOI: 10.16085/j.issn.1000-6613.2017-0848

氟化物及制备工艺对高纯氧化铝陶瓷组织形貌的影响

田清波^1,2, 杨晓洁³, 代金山², 王玥², 吕志杰²

1 山东建筑大学山东省绿色建筑协同创新中心, 山东济南 250101;
2 山东建筑大学材料科学与工程学院, 山东济南 250101;
3 山东省产品质量检验研究院, 山东济南 250100

收稿日期:2017-05-09 修回日期:2017-08-15 出版日期:2018-01-05 发布日期:2018-01-05
通讯作者: 田清波(1970-),男,博士,教授。
作者简介:田清波(1970-),男,博士,教授。E-mail:tqb11@sdjzu.edu.cn。
基金资助:
国家自然科学基金项目（51375281）。

Influences of fluorides and the preparation processes on the morphology of high purity alumina ceramics

TIAN Qingbo^1,2, YANG Xiaojie³, DAI Jinshan², WANG Yue², LÜ Zhijie²

1 ShandongCo-innovation Center of Green Building, Shandong Jianzhu University, Jinan 250101, Shandong, China;
2 School of Materials Science and Engineering, Shandong Jianzhu University, Jinan 250101, Shandong, China;
3 Shandong Institute for Product Quality Inspection, Jinan 250100, Shandong, China

Received:2017-05-09 Revised:2017-08-15 Online:2018-01-05 Published:2018-01-05

摘要/Abstract

摘要： 以高纯氢氧化铝为主要原料，利用扫描电子显微镜、X射线衍射、X射线荧光光谱及X射线光电子能谱等技术，研究了引入NH₄F或AlF₃对α-Al₂O₃转变特征、氧化铝粉体及陶瓷显微结构的影响。结果表明：引入NH₄F或AlF₃促进α-Al₂O₃晶体形貌由颗粒状向片状转变。但是经高温煅烧，形成的片状α-Al₂O₃晶体又转变为颗粒状晶粒。粉体经不同压力成型后的块状样品，在1300℃煅烧后，α-Al₂O₃晶体仍保留片状形态。但是进一步升温到1600℃烧结的氧化铝陶瓷，晶体形貌由片状逐渐转变为多面体。热压条件下，氧化铝陶瓷晶体仍能够保持片状，没有出现多面体形态。随着烧结温度的提高，样品烧结致密化程度不断增大，相对密度从77.6%增加到92.2%。相比以片状粉体为原料烧结的α-Al₂O₃陶瓷，以颗粒状粉体为原料烧结的陶瓷相对密度要大，在1600℃烧结的α-Al₂O₃陶瓷密度从92.2%提高到93.0%。

关键词: 氧化铝, 显微结构, 烧结, 粉体, 氟化物

Abstract: a-Al₂O₃ powders and aluminaceramic were prepared by high pure AlOOH as the precursor material. Effects of NH₄F or AlF₃ on the transformation and microstructure of the a-Al₂O₃ powders and ceramic were investigated by scanning electron microscopy, X-ray diffraction, X-ray fluorescence and X-ray photoelectron. The results show that the introduction of NH₄F or AlF₃ promotes the morphology of α-Al₂O₃ to change from particle-like to plate-like shape. However, the α-Al₂O₃ platelets will revert to grains again after calcinated at high temperature. The plate-like α-Al₂O₃ can maintain the disk shape after calcinated at 1300℃, when the α-Al₂O₃ powders are pressed into disk under different pressure. The morphology of α-Al₂O₃ crystals changes from platelet to polygonal when they are further sintered up to 1600℃. However, under hot pressing condition, the platelet α-Al₂O₃ crystals don't show the polygonal morphology. The densification of α-Al₂O₃ ceramic is strengthened and the relative density of the ceramics increases from 77.6% to 92.2%with the rise of the sintering temperature. The density of α-Al₂O₃ ceramic prepared with particle-shaped powders is larger, compared to that prepared with plate-like powders, which increases from 92.2% to 93.0% after sintered at 1600℃.

Key words: alumina, microstructure, sintering, powder, fluorides

中图分类号:

田清波, 杨晓洁, 代金山, 王玥, 吕志杰. 氟化物及制备工艺对高纯氧化铝陶瓷组织形貌的影响[J]. 化工进展, 2018, 37(01): 182-188.

TIAN Qingbo, YANG Xiaojie, DAI Jinshan, WANG Yue, LÜ Zhijie. Influences of fluorides and the preparation processes on the morphology of high purity alumina ceramics[J]. Chemical Industry and Engineering Progress, 2018, 37(01): 182-188.

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氟化物及制备工艺对高纯氧化铝陶瓷组织形貌的影响

Influences of fluorides and the preparation processes on the morphology of high purity alumina ceramics

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