Ablation behavior and mechanism of boron nitride - magnesium aluminum silicate ceramic composites in an oxyacetylene combustion flame. Issue 2 (1st February 2018)

• Record Type: Journal Article
• Authors: Cai, Delong; Yang, Zhihua; Yuan, Jingkun; Duan, Xiaoming; Wang, Shengjin; Ocelik, Vaclav; Vainchteind, D.I.; De Hossond, J.TH.M.; Jia, Dechang; Zhou, Yu
• Is Part Of: Ceramics international. Volume 44:Issue 2(2018)
• Page Start: 1518
• Page End: 1525
• Publication Date: 2018-02-01
• Subjects: Thermal applications -- Composites -- Ablation mechanism -- Nitrides; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2017.10.063
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In the present study, ablation behavior and properties of BN-MAS (magnesium aluminum silicate) composites impinged with an oxyacetylene flame at temperatures up to 3100 °C were investigated. As ablation time ranged from 5 to 30 s, the mass and linear ablation rates increased from 0.0027 g/s and 0.001 mm/s to 0.0254 g/s and 0.087 mm/s, respectively. A SiO2 -rich protective oxide layer formed during the ablation process, which contributed to the oxidation resistance of the composites. Ablation products mainly consisted of magnesium-aluminum borosilicate glass, mullite, spinel and indialite. The thermal oxidation of h -BN during flame ablation and scouring of MAS by high-speed gas flow were the main ablation mechanisms.