Compared with their metal counterparts, the insufficient erosion resistance of polymer matrix composites (PMC) is a key issue for application in aero-engines. In this study, multilayered coatings were deposited on carbon fiber reinforced bismaleimide polymer composites using detonation spraying to improve their erosion resistance. The coatings consisted of a polymer–aluminum mixed transition layer, pure aluminum bond layer, and WC-17Co top layer The microstructure and bond strength of the coatings were characterized by using scanning electron/transmission electron microscopy and mechanical testing, respectively. Furthermore, solid particle erosion tests were conducted on coated and uncoated PMC at 25 and 250 °C using an air jet. The tests showed that the coatings 150 µm thick were well bonded to the PMC substrate. Substantial enhancement of the coating adhesion up to 16.5 ± 0.5 MPa was achieved by the optimization of the polymer–aluminum mixed transition layer. Under the same erosion conditions, the volume loss of the coated PMC was less than 1/10 of that of uncoated PMC, indicating the effectiveness of the coating to prevent the PMC from the foreign objects’ impact damage. Finally, the coating erosion mechanisms are discussed.

中文翻译：

---

爆炸喷涂多层涂层提高聚合物基复合材料的耐腐蚀性

与其金属对应物相比，聚合物基复合材料 (PMC) 的抗侵蚀性不足是其在航空发动机中应用的关键问题。在这项研究中，使用爆炸喷涂将多层涂层沉积在碳纤维增强双马来酰亚胺聚合物复合材料上，以提高其耐腐蚀性。涂层由聚合物-铝混合过渡层、纯铝结合层和 WC-17Co 顶层组成。涂层的微观结构和结合强度分别通过扫描电子/透射电子显微镜和机械测试进行表征。此外，使用空气喷射器在 25 和 250 °C 下对涂层和未涂层​​ PMC 进行了固体颗粒侵蚀测试。测试表明，150 µm 厚的涂层与 PMC 基材结合良好。通过聚合物-铝混合过渡层的优化，涂层附着力显着提高了 16.5 ± 0.5 MPa。在相同侵蚀条件下，有涂层PMC的体积损失小于未涂层PMC的1/10，表明涂层有效防止了PMC受到外来物冲击损伤。最后，讨论了涂层侵蚀机制。