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 30s, the mass and linear ablation rates increased from 0.0027g/s and 0.001mm/s to 0.0254g/s and 0.087mm/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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