Molten-salt assisted synthesis and characterization of Mg2B2O5 and Al18B4O33 whiskers. Issue 3 (3rd July 2021)

• Record Type: Journal Article
• Authors: Liu, Zhaoyang; Yu, Jingkun; Wang, Xiangnan; Zhang, Xue; Wang, Jiakang; Jia, Danbin; Wen, Tianpeng; Yan, Zhengguo; Yuan, Lei; Ma, Beiyue
• Is Part Of: Journal of Asian ceramic societies. Volume 9:Issue 3(2021)
• Page Start: 1298
• Page End: 1309
• Publication Date: 2021-07-03
• Subjects: Molten salt method -- magnesium borate whisker -- aluminum borate whisker -- liquid-solid (ls) mechanism; Ceramics -- East Asia -- Periodicals; Materials science -- Periodicals; 620.1405
• DOI: 10.1080/21870764.2021.1972591
• Languages: English
• ISSNs: 2187-0764

Abstract

ABSTRACT: In this work, magnesium borate (Mg2 B2 O5 ) and aluminum borate (Al18 B4 O33 ) 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. Mg2 B2 O5 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 Al18 B4 O33 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.