文章信息/Info

Title:

Microstructure and Performance of Typical Anti-Cavitation Coatings Prepared by Thermal and Cold Spraying

文章編號:

1674-3962(2024)04-0281-09

作者:

劉偉杰; 武三栓; 何春艷; 褚欣; 劉敏; 張楠楠; 謝迎春

1. 沈陽工業大學材料科學與工程學院，遼寧 沈陽 110870 2. 廣東省科學院新材料研究所 現代材料表面工程技術國家工程實驗室廣東省現代表面工程技術重點實驗室，廣東 廣州 510651 3. 中國航發南方工業有限公司，湖南 株洲 412002

Author(s):

LIU Weijie;  WU Sanshuan;  HE Chunyan;  CHU Xin; LIU Min;  ZHANG Nannan;  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

關鍵詞:

冷噴涂; 鋁青銅涂層; 超音速火焰噴涂; WC基涂層; 抗空蝕性能

Keywords:

cold spraying;  aluminum bronze coating;  HVOF;  WC based coatings;  cavitation resistance

分類號:

TG174.4

DOI:

10.7502/j.issn.1674-3962.202307029

文獻標志碼:

A

摘要:

冷噴涂作為近年來興起的涂層固態沉積技術，所制備的涂層具有高結合強度、高硬度、無氧化夾雜等優點，在過流器械表面的空蝕損傷防護方面極具應用潛力。采用冷噴涂技術，在40Cr鋼基體表面制備了高致密的CuAl9Fe1鋁青銅抗空蝕涂層，利用光鏡/掃描電鏡、顯微硬度計、超聲波空蝕試驗機、三維輪廓儀等設備，表征了涂層的微觀結構、力學性能及抗空蝕性能，分析了涂層的空蝕破壞形貌及機理，并與超音速火焰（high-velocity oxygen-fuel，HVOF）噴涂制備的WC類典型抗空蝕涂層（WC-Co-Cr和WC-Cr2C3-Ni）進行了對比。結果表明，冷噴涂CuAl9Fe1涂層的平均孔隙率為1.4%，平均顯微硬度為3126 MPa，平均結合強度為32.3 MPa，空蝕6 h的空蝕深度為4.988 μm；與之相比，HVOF噴涂的WC-Co�睠r和WC-Cr2C3-Ni涂層的平均孔隙率分別為0.7%和1.6%，平均顯微硬度分別為10 065和10 094 MPa，平均結合強度分別為84.2和73.5 MPa，空蝕6 h的空蝕深度分別為11.901和10.645 μm。冷噴涂CuAl9Fe1涂層雖硬度較低，但塑韌性較好，可有效抑制空蝕過程中顆粒結合界面的裂紋萌生、擴展導致的顆粒脫落，因此相比HVOF制備的WC類涂層具有更高的抗空蝕性能。

Abstract:

Cold spraying, as a newly emerging coatings metal deposition technology, has many advantages， such as high bonding strength, high hardness, and low oxide 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 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-Cr2C3-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-Cr2C3-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 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 better cavitation resistance than WC type coatings prepared by HVOF.