In-situ synthesis of magnesium aluminate spinel – Zirconium diboride composite powder in magnesium chloride melt. Issue 8 (15th April 2022)

• Record Type: Journal Article
• Authors: Liu, Xueyin; Li, Kezhuo; Bao, Ke; Chen, Junfeng; Zhang, Haijun; Zhang, Shaowei
• Is Part Of: Ceramics international. Volume 48:Issue 8(2022)
• Page Start: 11869
• Page End: 11871
• Publication Date: 2022-04-15
• Subjects: MgAl2O4 -- ZrB2 -- MgCl2 -- Molten salt synthesis -- Composite powder -- Mechanism; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.02.107
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Phase pure MgAl2 O4 –ZrB2 composite powder was successfully synthesized at 1200 °C for 4 h from ZrO2, B2 O3, and Al, in molten MgCl2 which acted as not only an Mg-bearing reactant but also a liquid reaction medium. Mediated by such a liquid medium, Al initially reduced B2 O3, forming B and Al2 O3 which further reacted with ZrO2 and MgCl2, forming ZrB2 and MgAl2 O4, respectively. As prepared powder comprised angular MgAl2 O4 grains with sizes from ∼100 nm to ∼2 μm, and ZrB2 particles of ∼100 nm in average. The molten salt synthesis strategy demonstrated here is believed to be universally applicable to preparations of a range of MgAl2 O4 -boride composite powders for future in-depth exploration.