热/冷喷涂典型抗空蚀涂层结构与性能研究
Microstructure and Performance of Typical Anti-Cavitation Coatings Prepared by Thermal and Cold Spraying
刘伟杰 1武三栓 2何春艳 3褚欣 3刘敏 3张楠楠 4谢迎春3
作者信息
- 1. 沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870;广东省科学院新材料研究所 现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室, 广东 广州 510651
- 2. 中国航发南方工业有限公司, 湖南 株洲 412002
- 3. 广东省科学院新材料研究所 现代材料表面工程技术国家工程实验室广东省现代表面工程技术重点实验室, 广东 广州 510651
- 4. 沈阳工业大学材料科学与工程学院, 辽宁 沈阳 110870
- 折叠
摘要
冷喷涂作为近年来兴起的涂层固态沉积技术,所制备的涂层具有高结合强度、高硬度、无氧化夹杂等优点,在过流器械表面的空蚀损伤防护方面极具应用潜力.采用冷喷涂技术,在 40Cr钢基体表面制备了高致密的CuAl9Fe1 铝青铜抗空蚀涂层,利用光镜/扫描电镜、显微硬度计、超声波空蚀试验机、三维轮廓仪等设备,表征了涂层的微观结构、力学性能及抗空蚀性能,分析了涂层的空蚀破坏形貌及机理,并与超音速火焰(high-velocity oxygen-fuel,HVOF)喷涂制备的WC类典型抗空蚀涂层(WC-Co-Cr和WC-Cr2 C3-Ni)进行了对比.结果表明,冷喷涂CuAl9Fe1 涂层的平均孔隙率为 1.4%,平均显微硬度为 3126 MPa,平均结合强度为 32.3 MPa,空蚀 6 h的空蚀深度为4.988 μm;与之相比,HVOF喷涂的WC-Co-Cr和WC-Cr2 C3-Ni涂层的平均孔隙率分别为 0.7%和1.6%,平均显微硬度分别为10 065 和10 094 MPa,平均结合强度分别为84.2 和73.5 MPa,空蚀6 h的空蚀深度分别为 11.901 和 10.645 μm.冷喷涂CuAl9Fe1 涂层虽硬度较低,但塑韧性较好,可有效抑制空蚀过程中颗粒结合界面的裂纹萌生、扩展导致的颗粒脱落,因此相比HVOF制备的WC类涂层具有更高的抗空蚀性能.
Abstract
Cold spraying,as a newly emerging coatings metal deposition technology,has many advantages,such as high bonding strength,high hardness,and low oxide inclu-sions,thus exhibiting significant application potential in protective coatings of overcurrent devices for cavitation dam-age.In this study,highly dense CuAl9Fe1 aluminum bronze coatings were deposited on the surface of the 40Cr steel substrate by cold spraying.Using techniques such as optical microscope,scanning electron microscope,microhardness indenter,supersonic cavitation tester,and 3D profilometer,the coating microstructure,mechanical properties and cavitation performances were systematically studied,and the coating cavitation morphologies and cavitation mechanisms were analyzed.The cold sprayed CuAl9Fe1 coatings were also compared with HVOF sprayed typical WC type anti-cavitation coatings(WC-Co-Cr and WC-Cr2 C3-Ni).The results show that the average porosity of cold sprayed CuAl9Fe1 coating is 1.4%,the average micro-hardness is 3126 MPa,the average bonding strength is 32.3 MPa,and the depth of erosion after 6 h cavitation is 4.988 μm;as a comparison,the average porosities of HVOF sprayed WC-Co-Cr and WC-Cr2 C3-Ni coatings are 0.7%and 1.6%,the average micro-hardnesses are 10 065 and 10 094 MPa,the average bonding strengths are 84.2 and 73.5 MPa,and the depth of erosion are 11.901 and 10.645 μm,respectively.Although the cold sprayed CuAl9Fe1 coat-ing has lower hardness,its higher plasticity and toughness can effectively suppress the initiation and propagation of cracks at interparticle boundaries during cavitation and particle detachment,therefore,it has better cavitation resistance than WC type coatings prepared by HVOF.
关键词
冷喷涂/铝青铜涂层/超音速火焰喷涂/WC基涂层/抗空蚀性能Key words
cold spraying/aluminum bronze coating/HVOF/WC based coatings/cavitation resistance引用本文复制引用
基金项目
中法政府间科技合作项目国家重点研发计划(2023YFE0108000)
广东省特支计划(2019BT02C629)
广东省科学院打造综合产业技术创新中心专项(2022GDASZH-2022010107)
广东省科学院发展专项(2022GDASZH-2022010203-003)
航空发动机及燃气轮机基础科学中心项目(P2022-B-Ⅳ-011-001)
广东省重点领域研发计划(2020B0101330001)
出版年
2024
NETL
NSTL
万方数据