THE INFLUENCES OF FLUORIDES ON THE TRANSFORMATION OF α-ALUMINA CRYSTALS

被引：7
作者：
Tian, Qingbo [1 ,2 ]
Yang, Xiaojie [3 ]
Wang, Yue [2 ]
Lv, Zhijie [2 ]
机构：
[1] Shandong Jianzhu Univ, Coinnovat Ctr Green Bldg Shandong Prov, Jinan 250101, Shandong, Peoples R China
[2] Shandong Jianzhu Univ, Sch Mat Sci & Engn, Jinan 250101, Shandong, Peoples R China
[3] Shandong Inst Prod Qual Inspect, Jinan 250100, Shandong, Peoples R China
来源：
CERAMICS-SILIKATY | 2017年 / 61卷 / 04期
基金：
中国国家自然科学基金;
关键词：
alpha-Al2O3; Morphology; Platelet-like Al2O3; Fluorides; PHASE-TRANSFORMATION; GRAIN-GROWTH; ALF3; DENSIFICATION; ALPHA-AL2O3; TRANSITION; POWDERS;
D O I：
10.13168/cs.2017.0035
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Influence of addition of aluminumfluoride (AlF3) and ammonium fluoride (NH,F) on transformation of alpha-A1,03from boehmite was investigated. Transformation of alpha-Al2O3 occurred at about 1050 degrees C and 950 degrees C, when boehmite contained AlF, and NH4F additives respectively, which was 150 degrees C and 300 degrees C lower than that without any additives. The formed a -A1203 consisted of clear, hexagonal plate -like particles about 2-3 mu m in diameter and 200 nm in thickness. However, the formed hexagonal platelet particles gradually became blunt at edges and decreased in sizes at the higher calcinating temperatures. The transfer of alpha-Al2O3 morphology was due to the diminution and disappearance of fluorine. The fluoride coated on the surfaces were firstly decomposed and then fluorine entered the lattices of crystals was volatilized. The fluoride with tiny particles attached on the surface had a same chemical bonding of F Al-O with that in the lattices of crystals.
引用
收藏
页码：357 / 366
页数：10
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