Ablation behavior and mechanism of boron nitride - magnesium aluminum silicate ceramic composites in an oxyacetylene combustion flame |
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| Authors: | Delong Cai Zhihua Yang Jingkun Yuan Xiaoming Duan Shengjin Wang Vaclav Ocelik DI Vainchteind JTHM De Hossond Dechang Jia Yu Zhou |
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| Affiliation: | 1. Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Heilongjiang, Harbin 150080, People''s Republic of China;2. Key Laboratory of Advanced Structrual-Functional Integration Materials & Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, People''s Rebublic of China;3. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Heilongjiang, Harbin 150001, People''s Republic of China;4. Department of Applied Physics, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands |
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| 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. |
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| Keywords: | Thermal applications Composites Ablation mechanism Nitrides |
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