Erosion Resistance Improvement of Polymer Matrix Composites by Detonation-Sprayed Multilayered Coatings
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Erosion Resistance Improvement of Polymer Matrix Composites by Detonation-Sprayed Multilayered Coatings Yongjing Cui1,3 • Changliang Wang1,2 • Zhihui Tang1
Submitted: 17 March 2020 / in revised form: 22 September 2020 / Accepted: 25 October 2020 Ó ASM International 2020
Abstract 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 lm 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.
& Yongjing Cui [email protected] 1
AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China
2
Key Laboratory of Advanced Corrosion and Protection for Aviation Materials, Aero Engine Corporation of China, Beijing 100095, China
3
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, China
Keywords aero-engine coating adhesion detonation spray polymer matrix composite solid particle erosion WC-Co coating
Introduction With the advantages of high specific strength, strong designability, and fatigue resistance, polymer matrix composites (PMC) are increasingly utilized in the advanced aero-engine field. It has become the trend of advanced aero-engine design to use PMC instead of traditional metal structure materials in the design of fan blades, stationary blades, guide vanes, boxes, and other components. During aero-engine operation, the components located in the engine flow path must withstand the erosion of dust particles entrained by the high-speed airflow, which is one of the key factors causing the failure of the components [1, 2]. Furthermore, the hardness of PMC is lower than that of the metallic counterpart, and its wear and erosion resistance is insufficient, which has become the main obstacle of the engineering application. The preparation of cemented carbide coatings by various thermal spraying technology can effectively improve the hardness and wear/erosion resistance of the meta
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