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

Abstract

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 1 200 ℃. 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.

Yttrium Silicate‐Coated Carbon Fiber Reinforced Phenolic Aerogel‐like Composites with Low Density and Low Ablation

“…[24] The second pyrolysis weight loss interval was at 366 ~839 °C, with a mass loss of about 27 %, which was mainly pyrolysis gases produced by the pyrolysis of the aerogel. [25] The pyrolysis products in this process mainly include aromatic hydrocarbons, aromatic alcohols, small molecule hydrocarbons, carbon, and oxygen gases such as water, hydrogen, methane, carbon monoxide, etc. [23,26] In the temperature interval of 839 ~1000 °C, the TG curves of PR-8, PR-10, and PR-12 were relatively smooth with a low mass loss rate of about 1.9 %.…”