Molten-salt assisted synthesis and characterization of Mg2B2O5 and Al18B4O33 whiskers

Journal of Asian Ceramic Societies

Xiangnan Wang¹  Zhengguo Yan²  Jiakang Wang²  Danbin Jia²  Xue Zhang²  Beiyue Ma²  Zhaoyang Liu²  Tianpeng Wen²  Lei Yuan²  Jingkun Yu³ 

[1] School of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao, P.R. Chin;School of Metallurgy, Northeastern University, Shenyang, P.R. Chin;School of Metallurgy, Northeastern University, Shenyang, P.R. Chin;State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, P.R. Chin;

关键词: Molten salt method;    magnesium borate whisker;    aluminum borate whisker;    liquid-solid (ls) mechanism;   

DOI  :  10.1080/21870764.2021.1972591

来源: Taylor & Francis

【 摘 要 】

In this work, magnesium borate (Mg2B2O5) and aluminum borate (Al18B4O33) whiskers with a high aspect ratio were successfully synthesized using a molten salt method. The phase transformation and morphology involution of the whiskers were studied by XRD, IR-FT, TG-DSC, and SEM-EDS with different boron/metal ratios and reaction temperatures. The results show a rich boron environment and appropriate reaction temperature to be the crucial factors with respect to the composition and morphology of the borate whiskers. Mg2B2O5 whiskers with a diameter of several hundred nanometers and a 10–60 length–diameter ratio were obtained when the B/Mg ratio was 1.5:1 and the reaction temperature was 800°C. For Al18B4O33 whiskers, a synthesis temperature of 1000°C and a B/Al ratio of 3:9 were found to be optimal with respect to the whisker morphology. A liquid-solid (LS) mechanism is proposed as the growth mechanism of the whiskers on the basis of the experimental phenomena.

【 授权许可】

CC BY