热压滤溶胶-凝胶制备新型高温可磨耗封严涂层的结构与特性研究

项目名称： 热压滤溶胶-凝胶制备新型高温可磨耗封严涂层的结构与特性研究

项目编号： No.51201156

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 金属材料学科

项目作者： 高俊国

作者单位： 中国航空工业集团公司北京航空材料研究院

项目金额： 25万元

中文摘要： 本项目针对热喷涂陶瓷基高温可磨耗封严涂层硬度较高容易造成叶片磨损以及容易产生大块摩擦剥落影响发动机运转这一关键科学问题，提出采用热压滤溶胶-凝胶法制备陶瓷基高温可磨耗封严涂层新工艺。利用溶胶-凝胶法独特的制备工艺，制备高度均匀且具有大量微孔结构的新型陶瓷基高温可磨耗封严涂层。通过涂层的非熔融性烧结结构和高度均匀微孔结构来改善涂层的硬度及可切削性，使涂层的可磨耗性能与抗冲蚀性能达到最佳平衡；利用涂层中大量存在的微孔和微裂纹结构松弛冷热循环中产生的热应力，使涂层具有优异的抗热震性能。并通过稀土氧化物掺杂或纳米Al2O3弥散进一步优化涂层结构，研究其对涂层可磨耗、抗冲蚀以及抗热震性能的影响及机制。为研究发展具有更优可磨耗、抗冲蚀以及抗热震性能的新型陶瓷基高温可磨耗封严涂层提供新的理论和新的技术途径。

中文关键词： 高温可磨耗封严涂层；热压滤；溶胶-凝胶；抗冲蚀；抗热震

英文摘要： The high hardness which was prone to abrading the engine blades and the block spallation which may affect the operation of engines were the key scientific problems for thermal spray coatings. In this project, high-temperature abradable seal coatings were prepared by a new process which was called thermal pressure filtration sol-gel method. Novel ceramic matrix abradable seal coatings with much more uniform structures and many micropores were prepared by this method. The hardness and cutting property of the coating were improved by the non-melting sintering structure and much more uniform micropore structure in the coating, which made a balance of the abradable property and erosion wear resistance for the coating. The large amount of micropores and microcracks in the coating could also release the thermal stresses generated during thermal cycling and made the coating have a good thermal shock resistance. The coating structures were further optimized by means of doping rare earth oxides and dispersing nano Al2O3 praticles. Their influence on abradable property, erosion wear resistance and thermal shock resistance were investigated and the relevant mechanisms were discussed. This research provides new theories and new technological approach for the development of novel high-temperature abradable seal coatings with

英文关键词： high-temperature abradable seal coating；thermal pressure filtration；sol-gel；erosion wear resistance；thermal shock performance