六钛酸钾晶须改性环氧有机硅树脂的抗烧蚀性能OA北大核心

The epoxy-silicone resin composites modified with potassium hexafluorotitanate whiskers(PHW)were prepared,and their oxygen-acetylene ablation performance was investigated,focusing on the impact of varying PHW content.The results indicate that addition of PHW can effectively enhance the anti-spalling capability and high-temperature ablation resistance of the epoxy organosilicon resin.When the PHW concentration is 20wt%,the composite material exhibits the lowest linear ablation rate and mass ablation rate,which are 0.136 mm/s and 1.143 g/s,respectively.These values are approximately 53.74%and 47.04%lower than those of the epoxy organosilicon resin alone.However,when the PHW content exceeds 20wt%,further increasing its amount is no longer significant-ly improving the ablation resistance of the composite material.Thermal gravimetric analysis(TGA)results reveal that the addition of PHW significantly decreases the weight loss rate of the epoxy-silicone resin.Specifically,when the PHW content is 20wt%,the weight loss rate of the composite material is approximately 38.57%,which is roughly 19.89%lower than that of the epoxy-silicone resin.Beyond a PHW content of 20wt%,further increases in its concentration within the composite material no longer yield a significant improvement in weight loss rate.