Development of silica fiber reinforced polybenzoxazine composites filled with alumina particles as ablative materials

Date

2024-11-13

Author

Küçük, İbrahim Egemen

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The aerospace industry is seeking a replacement of phenolics to use in ablative materials because of their toxicity to human health. One of the most promising candidates is polybenzoxazine materials because of their extreme heat resistance and less toxicity. This thesis introduces thermal and mechanical properties improvement of polybenzoxazine materials by manufacturing a silica fiber-reinforced polybenzoxazine composite with the incorporation of submicron sized alumina particles. The flexural and interlaminar shear strengths of the polybenzoxazine composites were successfully risen ~11% and ~27%, respectively. One of the lowest mass ablation rates of fiber-reinforced ablative composites in the literature, 0.0284 g/s, has been achieved in the oxyacetylene test by the addition of only 3 wt% submicron alumina particles into the composite. This alumina addition reduced the ablation rate by ~15% compared to neat polybenzoxazine composite indicating increased insulation performance for alumina added polybenzoxazine composite. This promising research points out the increased mechanical properties, improved thermal durability, and reduced ablation rate of the silica fiber-reinforced polybenzoxazine composites filled with alumina particles, and this thesis proves that polybenzoxazine materials are favorable candidates for ablation/insulation materials to be used in thermal protection systems of aerospace vehicles instead of toxic phenolic based materials.

Subject Keywords

Polybenzoxazine composites, Alumina, Silica fiber, Ablative, Thermal protection material

URI

https://hdl.handle.net/11511/112708

Collections

Graduate School of Natural and Applied Sciences, Thesis