The deposition of hydrocarbon pyrolysis gas in the pore structure of the char layer of polymer composites is a special chemical vapour deposition process. While investigation of hydrocarbon pyrolysis gas deposition characteristics is highly significant for obtaining an in-depth understanding of the ablation mechanism of polymer composites and the establishment of accurate ablation models, no studies on this topic have been reported to date. In this study, the deposition characteristics in the pore structure of the char layer were examined using an experimental device designed to simulate pyrolysis gas deposition in the char layer during ablation. The experimental results show that the deposition rate is affected by the change in the pore structure during the deposition process. The deposition process can be divided into rapid deposition in the pore structure, transition deposition and slow deposition on the surface of the char layer. In the temperature range of 800–1000 $°C$, the deposition rate in the pore structure of the char layer is significant affected by the temperature, showing an obvious linear growth relationship.

烃类热解气体在聚合物复合材料炭层的孔结构中的沉积是一种特殊的化学气相沉积工艺。尽管对碳氢化合物热解气体沉积特性的研究对于深入理解聚合物复合材料的烧蚀机理和建立精确的烧蚀模型具有非常重要的意义，但迄今为止，尚未对此主题进行任何研究。在这项研究中，使用设计为模拟烧蚀过程中炭层中热解气体沉积的实验装置检查了炭层孔结构中的沉积特性。实验结果表明，沉积速率受沉积过程中孔结构变化的影响。沉积过程可分为在孔结构中的快速沉积，在炭层表面上的过渡沉积和缓慢沉积。在800–1000的温度范围内$°C$，炭层孔隙结构中的沉积速率受温度的影响很大，表现出明显的线性增长关系。