High temperature creep of 20 vol%. SiC-HfB2 UHTCs up to 2000 °C and the effect of La2O3 addition. Issue 1 (January 2018)

• Record Type: Journal Article
• Authors: Zapata-Solvas, E.; Gómez-García, D.; Domínguez-Rodríguez, A.; Lee, W.E.
• Is Part Of: Journal of the European Ceramic Society. Volume 38:Issue 1(2018)
• Page Start: 47
• Page End: 56
• Publication Date: 2018-01
• Subjects: Ultra-high temperature ceramics -- Creep -- Cavitation damage -- Reaction damage -- Limited ductility; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2017.08.028
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: High temperature compressive creep of SiC-HfB2 UHTCs up to 2000 °C has been studied. Microstructural analysis after deformation reveals formation of new phases in the Hf-B-Si and Hf-B-Si-C systems, which are responsible for the poor creep resistance. RE oxide additions have a negative effect reducing the creep resistance of SiC-HfB2 UHTCs. A simplistic analysis for the required creep resistance is described, indicating that only SiC-HfB2 UHTCs could withstand re-entry conditions for 5 min in a single use. However, RE oxide addition to SiC-HfB2 UHTCs does not provide the required creep resistance for them to be candidate materials for hypersonic applications.