SiCf/SiC复材表面Sc2O3-Y2O3-ZrO2基梯度可磨耗涂层设计及性能研究

Design and Evaluation of Sc2O3-Y2O3-ZrO2 Based Abradable Coatings on SiCf/ SiC Composites

摘要:

SiC_f/SiC陶瓷基复合材料是未来航空发动机重要材料之一，其表面涂层是保护SiC_f/SiC陶瓷基复合材料关键技术。针对陶瓷基复材表面的Sc₂O₃-Y₂O₃-ZrO₂基可磨耗涂层与EBC涂层结合力不够高、应力匹配性差等问题，开展Sc₂O₃-Y₂O₃-ZrO₂基梯度可磨耗涂层设计、制备与考核技术研究，并且与非梯度可磨耗涂层进行性能对比。研究结果表明：梯度可磨耗涂层比非梯度可磨耗涂层结合强度提高了6.7%；在（1 250±50） ℃高温冲击1 000次后，梯度可磨耗涂层 剥落面积仅为非梯度可磨耗涂层剥落面积的1/6。因此，梯度可磨耗涂层具有更好的力学性能，有望在未来航空发动机中得到广泛应用。

Abstract:

SiC_f/SiC ceramic matrix composites are crucial materials for the next-generation aero-engines， and their surface coatings play a vital role in protecting them. are the key technologies for protecting SiC_f/SiC ceramic matrix composites. However， there are challenges related to insufficient bonding force and poor stress matching between Sc₂O₃-Y₂O₃-ZrO₂-based abradable coating and EBC coating. To address these issues， this study aimed to design， prepare and assess a Sc₂O₃-Y₂O₃-ZrO₂-based gradient abradable coating. The results of the research indicate that the bonding strength of the gradient abradable coating is 6.7% higher than that of the non-gradient abradable coating. Moreover， when the gradient abradable coating is experienced 1000 times thermal shocks at （1 250±50） ℃，the peeling area was only 1/6 of the non-gradient abradable coating. These findings suggest that the gradient abradable coating could be a potential solution for enhancing the protective capabilities of SiCf/SiC ceramic matrix composites.