Enhanced Thermal Resistance of Boron Phenolic Composites by Addition of TiSi₂ Particles

Abstract

TiSi₂ reinforced boron phenolic composites (TP) and Vitreous silica fabric reinforced TiSi₂/boron phenolic composites (VTP) were prepared by compression molding, and their thermal, mechanical, ablation properties were studied. TG results show that thermal stabilities and residual carbon rate of boron phenolic are improved after introducing TiSi₂ particles. Compared with VTP-0 (containing 0 phr TiSi₂), flexural strength of VTP-60 (containing 60 phr TiSi₂) pyrolysis product increases by 29.5% at 1 200 °C. Raman spectrum shows that TiSi₂ particles promote the ordering of the glass carbon structure of VTP pyrolysis product. Compared to VTP-0, the linear and mass ablation rates of VTP-60 reduce by 32.1% and 77.5%, respectively. XRD and SEM indicate the formation of an oxide coating layer, TiO₂-SiO₂, integrates the bulk and protects the underlying materials from damage under high temperature oxygen-containing airstream. All these results prove that mechanical properties of pyrolysis product, thermal, and ablation resistance are improved by addition of TiSi₂ particles.

Keywords

TiSi₂ / boron phenolic resin / thermal stability / ablation / eutectic

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