Influence of calcium hexaluminate gradation on interfacial microstructure and fracture behavior of cement-bonded alumina castables. Issue 10 (15th May 2023)

• Record Type: Journal Article
• Authors: Pan, Liping; Li, Yawei; Tan, Fangguan; Wang, Qiang; Chen, Yichen; Wang, Qinghu; Zhu, Tianbin; Liao, Ning; Xu, Yibiao
• Is Part Of: Ceramics international. Volume 49:Issue 10(2023)
• Page Start: 16137
• Page End: 16148
• Publication Date: 2023-05-15
• Subjects: Alumina castables -- Calcium hexaluminate -- Toughness -- Fracture behavior; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.211
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: To reduce the brittleness of cement-bonded alumina castables for purging plug, different gradations (5-3, 3-1 and 1-0 mm) of calcium hexaluminate aggregates are introduced to replace the tabular alumina aggregates. The interfacial microstructure and fracture behavior with or without calcium hexaluminate aggregates are systematically analyzed. The results show that the large (5-3/3-1 mm) and small (1-0 mm) particle sizes of calcium hexaluminate contributed to the interfacial bonding and prolonged crack propagation path of cement-bonded alumina castables, respectively. Accordingly, the strength is promoted and the fracture mode is significantly affected under tensile stress. Specifically, the proportion of cracks propagating along the interface can be reduced by introducing 5-3-or 3-1 mm calcium hexaluminate particles. Besides, the introduction of 1-0 mm particles reduces the proportion of cracks propagating within the aggregate. Cement-bonded alumina castables containing three particle sizes (5-3/3-1/1-0 mm) of calcium hexaluminate have simultaneously better strength and toughness than castables containing a single particle size.