Effects of processing temperature on microstructures and mechanical behaviours of reactive hot-pressed SiC(SCS-6)/Ti/ZrB2–ZrC hybrid composites. Issue 16 (December 2016)

• Record Type: Journal Article
• Authors: Guo, Shuqi
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 16(2016)
• Page Start: 3851
• Page End: 3861
• Publication Date: 2016-12
• Subjects: SiC fibre -- ZrB2–ZrC ceramics -- Hybrid composites -- Microstructure -- Mechanical behaviour; 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.2016.06.009
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: In this study, hybrid composites comprising SiC(SCS-6)/Ti composite and ZrB2 –ZrC ceramics were prepared by sandwiching Ti/SiC(SCS-6)/Ti sheets and Zr + B4 C powder layers, followed by reactive hot pressing (RHPing) between 1250 °C and 1400 °C. The effects of RHPing temperature on the microstructures and the mechanical behaviours of the composites were examined. For the samples prepared at 1250 °C and 1300 °C, a Ti-rich zone was observed in the matrix and around the fibres. However, for the sample prepared at 1400 °C, no Ti-rich zone was observed. In addition, the hybrid composites show noncatastrophic fracture behaviour, irrespective of RHPing temperature. Compared to the sample processed at 1400 °C, the samples processed at 1250 °C and 1300 °C exhibited higher flexural strength and greater damage tolerance. The lower strength and damage tolerance for the composite processed at 1400 °C are attributed to stronger interface bonding via significant degradation of the C-rich coating and to strength degradation of the fibres.