Cohesive properties of refractory castable at 600 degrees C: Effect of sintering and testing temperature

Author(s)

Vargas, R. ; Canto, R. B. ; Hild, F.

• Document type: Journal article
• Source: Journal of the European Ceramic Society; v. 42, n. 14, p. 17-pg., 2022-08-13.

Abstract

This paper aims to evaluate cohesive properties for an alumina refractory with mullite-zirconia aggregates from wedge splitting tests (WST), and to assess their sensitivity to sintering and testing temperature. Five experiments were analyzed of which four were performed at 600 degrees C. The sought parameters were determined via weighted finite element model updating. The cohesive strength and the fracture energy were successfully calibrated and resulted in simulated data close to their experimental counterparts (i.e., between 4 and 11 times the measurement uncertainty). Increasing the sintering temperature from 1400 degrees C to 1450 degrees C enhanced the cohesion between the mullite-zirconia aggregates and the alumina matrix (20 % increase of the fracture energy and of the fracture process zone length). When the WSTs were performed at 600 degrees C, the cohesive strength was 10 % smaller while the fracture energy was 70 % higher than that at room temperature. (AU)

• FAPESP's process: 18/15266-0 - Detection and quantification of fracture mechanisms of ceramics at room and high temperatures using digital image correlation
• Grantee: Rodrigo Bresciani Canto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 20/08077-6 - Fracture analysis of refractories at high temperatures via numerical simulation and digital image correlation
• Grantee: Rodrigo Bresciani Canto
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/23081-0 - Fracture mechanisms of refractories at room and elevated temperatures analyzed with wedge splitting tests and image correlation
• Grantee: Rafael Vargas Maginador
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/09238-6 - Identification of the 3D fracture process zone for refractory materials by digital volume correlation combined with finite element analyses
• Grantee: Rafael Vargas Maginador
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate