Enhanced Thermal Resistance of Boron Phenolic Composites by Addition of TiSi_(2) Particles

TiSi_(2) reinforced boron phenolic composites(TP)and Vitreous silica fabric reinforced TiSi_(2)/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 TiSi_(2) particles.Compared with VTP-0(containing 0 phr TiSi_(2)),flexural strength of VTP-60(containing 60 phr TiSi_(2))pyrolysis product increases by 29.5%at 1200℃.Raman spectrum shows that TiSi_(2) 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,TiO_(2)-SiO_(2),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 TiSi_(2) particles.