Microstructure and Performance of Typical Anti-Cavitation Coatings Prepared by Thermal and Cold Spraying
MATERIALS CHINA[ISSN:1674-3962/CN:61-1473/TG]
- Issue:
- 2024年第04期
- Page:
- 80-89
- Research Field:
- Publishing date:
Info
- Title:
- Microstructure and Performance of Typical Anti-Cavitation Coatings Prepared by Thermal and Cold Spraying
- Author(s):
- LIU Weijie1; 2; WU Sanshuan3; HE Chunyan2; CHU Xin2; LIU Min2; ZHANG Nannan1; XIE Yingchun
- 1. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China
2. Institute of New Materials, Guangdong Academy of Sciences, National Engineering Laboratory of Modern Materials Surface Engineering Technology, Guangdong Provincial Key Laboratory of Modern Surface Engineering Technology, Guangzhou 510651, China
3. AECC South Industry Co., Ltd., Zhuzhou 412002, China
- Keywords:
- cold spraying; aluminum bronze coating; HVOF; WC based coatings; cavitation resistance
- CLC:
- PACS:
- TG174.4
- DOI:
- 10.7502/j.issn.1674-3962.202307029
- DocumentCode:
- Abstract:
- Cold spraying, as a newly emerging solid-state metal deposition technology, has many advantages such as high bonding strength, high hardness, and low oxide inclusions, thus exhibiting significant application potential in protective coatings of overcurrent devices for cavitation damage. In this study, highly dense CuAl9Fe1 aluminum bronze coatings were deposited on 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-10Co-4Cr and WC-Cr2C3-Ni). The results show that the average porosity of cold sprayed CuAl9Fe1 coating is 1.4%, the average hardness is 319 HV0.3, 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-10Co-4Cr and WC-Cr2C3-Ni coatings are 0.7 and 1.6%, the average hardnesses are 1027 and 1030 HV0.3, the average bonding strengths are 84.2 and 73.5 MPa, and the depth of erosion are 11.901 and 10.645 µm after 6 h, respectively. Although the cold sprayed CuAl9Fe1 coating 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 higher cavitation resistance than WC type coatings prepared by HVOF.
Last Update: 2024-03-28