Microstructure and properties of microporous MgO–Al2O3 refractory aggregates from Mg(OH)2 and Al(OH)3

• DOI: 10.1111/ijac.14627
• Publication Date: 2023-12-11T21:29:23Z
• Authors: Junjie Yan; Wen Yan; Xiao Wang; Nan Li
• Keywords: Kirkendall Effect; Particle (ecology)

Abstract In this work, microporous MgO–Al 2 O 3 refractory aggregates were prepared with Mg(OH) and Al(OH) via the in situ decomposition synthesis method. The effect of addition on microstructure properties was investigated scanning electron microscope mercury intrusion porosimetry. results indicated that improved green density samples reaction sintering accelerated mass transport rate adding from 0 to 4.0 wt%. Besides, a small amount Al 3+ diffused into porous MgO particles, accelerating merging growth nanopores particles. intra‐particle pore size densification degree microparticles increased, thus strength improved. Due formation Kirkendall voids by interdiffusion Mg 2+ , inter‐particle increased. Adding 17.6 wt%, weakened size. particles limited, resulting reduced increased number. reduced, decreased. At had best comprehensive properties, bulk 2.48 g/cm an apparent porosity 29.4%, median 1.6 μm 42.2 vol% thermal conductivity W/(m K).