A novel tar–silica sol bonded no‐cement Al 2 O 3 –SiC–C castable with improved carbon dispersion and SiC whisker formation
Year: 2025
Type: article
Abstract: This study prepared a novel carbon–silica (C–S) suspension, incorporating tar as the carbon source and silica sol as the binder. With robust bonding capabilities, it replaced conventional spherical bitumen in Al 2 O 3 –SiC–C (ASC) (where SiC is silicon carbide) refractory castables. Two key advantages were identified: improved carbon dispersion and in situ generation of SiC whiskers. This work advances the development of no‐cement castables by using silica sol as a binder, avoiding the drawbacks of traditional cement systems and enhancing high‐temperature performance. The effects of tar additions on the microstructure, phase composition, high‐temperature properties, oxidation behavior, and slag erosion resistance of C–S–ASC castables were systematically investigated. Results showed that 4 wt.% tar addition led to more uniform carbon distribution than conventional castables. Industrial Computed tomography (CT) analysis revealed a notable increase in matrix density, indicating effective SiC whisker formation. Consequently, thermal modulus of rupture, oxidation resistance, and slag erosion resistance were significantly improved. Specifically, thermal shock resistance (residual strength ratio = 61.1%) increased by 24% and oxidation resistance ( ω = 69.5%) by 20.9%, compared to castables with traditional carbon sources.
DOI: 10.1111/ijac.70025
Authors: Minghui Li, Chuanyang Cai, Gang Qi, Siwei Lv, Saisai Li, Ruoyu Chen
Institution: Anhui University of Technology
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
Awards: G1186329648, G7622541346
OpenAlex ID: W4413341680