Microstructure and properties of ablative C/ZrC–SiC composites prepared by reactive melt infiltration of zirconium and vapour silicon infiltration. Issue 3 (15th February 2017)

• Record Type: Journal Article
• Authors: Chen, Si'an; Li, Guangde; Hu, Haifeng; Li, Yong; Mei, Min
• Is Part Of: Ceramics international. Volume 43:Issue 3(2017)
• Page Start: 3439
• Page End: 3442
• Publication Date: 2017-02-15
• Subjects: B. Composites -- C. Mechanical properties -- D. Carbides -- Reactive melt infiltration; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.09.107
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: C/ZrC-SiC composites with a density of 3.09 g/cm 3 and a porosity of 4.8% were prepared by reactive melt infiltration and vapour silicon infiltration. The flexural strength and modulus were 235 MPa and 18.3 GPa, respectively, and the fracture toughness was 7.0 MPa m 1/2 . The formation of SiC and ZrSi2 during vapour silicon infiltration, at the residual cracks and pores in the C/ZrC, enhanced the interface strength and its mechanical properties. The high flexural strength (223 MPa, c . 95% of the original value) after oxidation at 1600 °C for 10 min indicated the excellent oxidation resistance of the composites after vapour silicon infiltration. The mass loss and linear recession rate of the composites were 0.0071 g/s and 0.0047 mm/s, respectively and a fine ablation morphology was obtained.