目的 拓宽碳化硅增强聚酰亚胺( SiC / PI ) 复合薄膜在耐磨涂层领域的应用。 方法 利用流延成膜法制备 SiC / PI 复合薄膜,在氮气氛围中对复合薄膜进行 600 ~ 1000 益 的碳化处理,并对碳化后的薄膜进行 SEM,XRD 及 FTIR 等测试,分析碳化过程中组织结构的变化。 结果 由于 SiC 纳米颗粒起到物理交联点的作用,复合薄膜的热稳定性和残碳率得到提高,同时也具有了断裂塑性特征。 随着碳化温度升高,复合薄膜六角碳层结构逐步完善。 PI 在碳化中,芳核自由基聚合成环数更多的分子,且 SiC 与 PI的界面处产生 Si—O 键。 结论 碳化过程中,SiC 纳米粒子与 PI 作用形成微弱的化学键合,改善了碳膜的界面结合情况,使得其耐热性得到提高。

Objective To broaden the application area of silicon carbide reinforced polyimide ( SiC / PI) composite film as erosion resistant coating. Methods The stretch film forming method was used to prepare SiC / PI composite films, then SiC / PI film was carbonized at temperatures ranging from 600 to 1000 益 , and the carbon films were analyzed by SEM, XRD and FTIR tests for the change of the organizational structure after carbonization. Results Due to its role as a physical junction, silicon carbide nano-particles increased the heat stability and carbon yield of the films, and granted the films with plastic fracture characteristics. As the temperature increased, the Hexagonal carbon layer structure was gradually formed. Silicon carbide and polyimide aromatic nuclear free radical polymerized and produced molecules with more rings in carbonization, and Si—O bonds were formed on the interface of SiC and PI. Conclusion During the carbonization, the nano-particles SiC and PI interacted to form weak bond, improving the interface bonding and the heat resistance of carbon films.