Properties of C/C–ZrC composites prepared by precursor infiltration and pyrolysis with a meltable precursor. (19th June 2019)

• Record Type: Journal Article
• Authors: Li, Yong; Meng, Xiaojun; Jia, Yan; Chen, Si'an; Mei, Min; Li, Guangde
• Is Part Of: Materials research express. Volume 6:Number 8(2019)
• Publication Date: 2019-06-19
• Subjects: composite materials -- precursor infiltration and pyrolysis -- meltable precursor -- ablation resistance -- flexural property; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ab2785
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: A melted ZrC precursor was used to prepare C/C–ZrC composites by precursor infiltration and pyrolysis (PIP) for reducing preparation time and rapid densification. The heat treatment time during the process was optimized. When the C/C–ZrC composites were annealed at 1650 °C after the fourth, eighth, and twelfth cycles, the composites were relatively compact with a few pores, and the density was 2.06 g cm −3 with an open porosity of 19.4%. The composites showed typical non-brittle fractures with numerous carbon fibers and bundle pullouts on the fracture surface. The preparation period was reduced to 12 cycles by using the melted ZrC precursor and the as-prepared composites had an enhanced mechanical properties. The flexural strength of the composites was 149 MPa, and the fracture toughness was 8.68 MPa·m 1/2 . The composites exhibited good ablation resistance, and the linear recession rate was 0.015 mm s −1 during oxyacetylene ablation tests for 60 s.