Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7990637 | Journal of Alloys and Compounds | 2018 | 25 Pages |
Abstract
This study investigates five lightweight corundum-magnesium aluminate spinel castables (LCSC) which consisted of porous corundum-spinel aggregates and matrices with 0-2.8â¯wt% silicon carbide (SiC). The effect of the SiC powder content (SPC) in the matrix on the microstructure, strength, thermal conductivity and slag resistance was analyzed by XRD, SEM and EDS as well as by the thermochemical software FactSage. The addition of SiC powder resulted in a significantly improved interface bonding between the porous aggregates and the matrix enhancing the strength and slag resistance. Whereas the thermal conductivity at 300â¯Â°C and 500â¯Â°C remained unchanged, it increased significantly at 800â¯Â°C and 1000â¯Â°C. The optimized LCSC contained 1.9â¯wt% SiC powder which combined a suitable apparent porosity (32.5%), a low bulk density (2.41â¯g/cm3), a high flexural strength (17.62â¯MPa), a high compressive strength (100.76â¯MPa), a low thermal conductivity (0.978â¯W/m·K, 1000â¯Â°C) and a high slag resistance.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhe Chen, Wen Yan, Stefan Schafföner, Sanbao Ma, Yajie Dai, Nan Li,