化学气相渗透(CVI) 法可避免高温对纤维造成的损伤，是C/SiC复合材料产业化的主要制造技术。但对于厚壁构件以及封闭构件，目前的CVI技术还存在沉积密度梯度大或沉积死角等问题，不能满足相关构件的制备要求。为此，本项目提出采用飞秒激光在沉积过程中对复合材料开孔，辅助和促进沉积过程，改善厚壁构件以及封闭构件沉积的新思路，研究微孔传质通道对复合材料沉积速率、密度均匀性、性能等的影响规律，以期提高复合材料的渗透率与致密度，调控其强韧化性能。基于以上研究结果，通过解决开孔沉积的扩散传质机理与规律、沉积过程开孔准则以及开孔对C/SiC复合材料的微结构演变和性能强化机制等基础科学问题，突破厚壁构件和封闭构件的高致密度、高强韧化的激光辅助化学气相渗透技术（LA-CVI）。本项目将丰富复合材料化学气相沉积理论，拓展陶瓷基复合材料微结构与性能调控的理论与方法，促进C/SiC复合材料在航空航天器的进一步应用。

Chemical vapor infiltration (CVI) method is the main manufacturing technology of C/SiC composite material industrialization which can avoid fiber damage at high temperature. But for thicker section and inner closure parts, the traditional CVI technology can not meet the requirements for the preparation of related components which may cause high deposition density gradient or no deposition. Therefore, this project is put forward to the new ideas which can support and promote the deposition process on thicker section and inner closure parts by machining femtosecond laser holes on the composite material during the deposition process. In order to improve the permeability and density, also strengthen the performance, we investigated the influence of micro channel on the deposition rate, density uniform and properties of the composite materials. Based on the above research results, It also can solve the basic scientific problems such as the diffusion mass transfer mechanism and rules with the deposition holes﹑the opening criterion of deposition process and the microstructure evolution and the strengthening mechanism after opening holes on C/SiC composites which breaks through the thicker sections and closed component by laser assisted chemical vapor infiltration technology (LA-CVI). This project will enrich CVI theory of composites and broaden the theory and method of the ceramic composites by means of controlling the microstructure and properties of C/SiC composite which can promote the further application in aviation spacecraft.