Ablation behavior of La2O3 modified C/C–ZrC composites fabricated by precursor infiltration and pyrolysis. (1st May 2023)

• Record Type: Journal Article
• Authors: Zhang, Xin; He, Qinchuan; Qing, Mingcong; Feng, Jie; Liu, Zhanpeng; Wang, Yiqun; Yin, Xuemin
• Is Part Of: Ceramics international. Volume 49(2023)Part A
• Page Start: 14335
• Page End: 14345
• Publication Date: 2023-05-01
• Subjects: C/C–ZrC composites -- La2O3 -- Precursor infiltration and pyrolysis -- Microstructure -- Ablation resistance; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2023.01.021
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: La2 O3 modified C/C–ZrC composites were produced by precursor infiltration and pyrolysis (PIP) technique, and the ablation resistance was tested in plasma flame at 1700 and 2400 °C. Results displayed that the density of the composites was ∼1.90 g/cm 3, and ZrC and La2 O3 were uniformly distributed in them. At 2400 °C, the linear and mass ablation rates of La2 O3 modified C/C–ZrC composites were 8.89 ± 0.82 μm/s and 0.21 ± 0.01 mg/s, respectively. The positive effect of La2 O3 was to promote the liquid phase sintering of ZrO2, which was helpful to promote the formation of an inlaid La–Zr–O molten layer that acted as a protective barrier. At 1700 °C, the composites exhibited minimal linear and mass ablation rates of 0.41 ± 0.14 μm/s and 0.04 ± 0.01 mg/s, respectively. At this temperature, La2 O3 promoted the solid phase sintering of ZrO2 to form an intact La–Zr–O particle-stacked layer, and the intact oxide layer positively protected the composites.