期刊
CERAMICS INTERNATIONAL
卷 44, 期 10, 页码 11374-11380出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.03.188
关键词
Spray precipitation; Calcination temperature; Holding time; alpha-Al2O3 powders
资金
- National Natural Science Foundation of China [51402133, 61775088, 61603160]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Guangdong Provincial Key Laboratory [2014B030301014]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYZZ16_0231, KYCX17_1651]
- Special Project for Technology Innovation of Xuzhou City [KC16GZ014, KC16HQ236, KC16HQ237]
- Research project of Jiangsu Normal University [15XLR033]
In this paper, weakly agglomerated and well dispersed alpha-Al2O3 powders were synthesized by a novel spray precipitation method. It was demonstrated that the as-prepared powders exhibited better dispersity than powders from conventional precipitation due to the increased phase contact and reaction area during the precipitation process. The effects of different titration ways, calcination temperature and holding time on the morphology, phase composition and sintering behaviour of Al2O3 powders were systematically investigated. Weakly agglomerated and well crystallized alpha-Al2O3 powders were obtained when the as-prepared precursors were calcined at 1150 degrees C for 2h in air. The average particle size of alpha-Al2O3 powders with higher sintering activity was approximately 68.6 nm, and the specific surface area was above 22.4 m(2) g(-1).
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