Influences of Alumimum Source Types on Preparation of Ultrafine ZnAl2O4 Powders by Molten Salt Method

Abstract

Abstract: In this paper, ZnAl₂O₄ powders were synthesized by molten salt method at 800~1 200 ℃ for 3 h in the mixed molten salt medium of KCl and LiCl using Al(OH)₃, calcined Al₂O₃ and nano-Al₂O₃ as different aluminum sources respectively. The effects of aluminum source types on the synthesis temperature, phase composition and microstructure of the synthesized products were mainly analyzed by XRD, SEM, laser particle size analysis, and specific surface analysis. On this basis, the effects of reaction temperature and the mass ratio of molten salt to raw material (W_s/W_r) on the synthesis of ZnAl₂O₄ powders were discussed. The results show that the type of aluminum source significantly affect the formation temperature of ZnAl₂O₄ and powder performances. Compared with calcined Al₂O₃, the speed of ZnAl₂O₄ formation is faster with Al(OH)₃ and nano-Al₂O₃ as the aluminum sources, and the pure phase ZnAl₂O₄ can be synthesized at 900 ℃. When calcined Al₂O₃ is used as an aluminum source, and the W_s/W_r ratio is 3∶1, the as-synthesized ZnAl₂O₄ powder exhibits best dispersibility, but higher temperatures easily lead to the agglomeration of powders. The formation of ZnAl₂O₄ can be promoted by the appropriate W_s/W_r ratio, and the particle size is the smallest when the W_s/W_r ratio is 4∶1. The ZnAl₂O₄ still retains the initial size and morphology of original Al₂O₃ raw material, indicating that the synthesis of ZnAl₂O₄ by molten salt method is mainly followed the “template synthesis mechanism”.

Key words: ZnAl₂O₄, molten salt method, molten salt medium, aluminum source type, phase composition, microstructure

CLC Number:

TB383.3

HUANG Depeng, XU Huan, LIU Jiangbo, FU Yingwen, ZHOU Zhenpeng. Influences of Alumimum Source Types on Preparation of Ultrafine ZnAl₂O₄ Powders by Molten Salt Method[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(12): 2347-2353.

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Influences of Alumimum Source Types on Preparation of Ultrafine ZnAl₂O₄ Powders by Molten Salt Method

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