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Mechanical Properties and Cavitation Erosion Behavior of CeO2-Modified Dual-scale WC-10Co-4Cr Coating Prepared by HVOF
Journal of Thermal Spray Technology ( IF 3.1 ) Pub Date : 2022-08-01 , DOI: 10.1007/s11666-022-01442-9
Ji Liu, Tongzhou Chen, Haitao Duan, Chengqing Yuan, Xiuqin Bai

Cavitation erosion is a major failure mode of hydraulic turbine components. Coatings could be an effective solution to this problem. In this study, a CeO2-modified (1 wt%) dual-scale WC-10Co-4Cr powder (WC composed of 70 wt% micrometer WC (2.5 μm) and 30 wt% nanometer WC (100 ~ 200 nm)) was fabricated by agglomeration and sintering. CeO2-modified dual-scale WC-10Co-4Cr coatings (C-coating), dual-scale WC-10Co-4Cr coatings (D-coating), and micrometer WC-10Co-4Cr coatings (M-coating) were then deposited using a high-velocity oxygen fuel (HVOF). The mechanical properties and cavitation erosion behavior of these coatings were studied. The results showed that the CeO2-modified WC-10Co-4Cr coatings could effectively reduce decarburization in the powder preparation and HVOF process, the coatings having the highest WC retention rate. The C-coatings possessed a higher fracture strength (6.3 MPa m1/2) and hardness (1348.2 HV0.3) than the D-coatings by more than 8.6 and 3.0%, respectively. The cavitation erosion resistance of the WC-10Co-4Cr coatings was affected by their microstructure and mechanical properties. The CeO2-modified coatings exhibited improved fracture toughness and hardness, reduced porosity, and, as a result, the C-coatings had the best cavitation erosion resistance.



中文翻译:

HVOF制备CeO2改性双尺度WC-10Co-4Cr涂层的力学性能和空蚀行为

气蚀是水轮机部件的主要失效模式。涂料可能是解决这个问题的有效方法。在这项研究中,制备了 CeO2 改性(1 wt%)双尺度 WC-10Co-4Cr 粉​​末(WC 由 70 wt% 微米 WC(2.5 μm)和 30 wt% 纳米 WC(100 ~ 200 nm)组成)通过附聚和烧结。然后使用 CeO2 改性的双尺度 WC-10Co-4Cr 涂层(C 涂层)、双尺度 WC-10Co-4Cr 涂层(D 涂层)和微米级 WC-10Co-4Cr 涂层(M 涂层)沉积一种高速氧燃料(HVOF)。研究了这些涂层的机械性能和气蚀行为。结果表明,CeO2改性WC-10Co-4Cr涂层能有效减少粉末制备和HVOF过程中的脱碳,涂层的WC保留率最高。1/2 ) 和硬度 (1348.2 HV0.3) 分别比 D 涂层高 8.6 和 3.0% 以上。WC-10Co-4Cr 涂层的抗气蚀性能受其微观结构和力学性能的影响。CeO2 改性涂层表现出更高的断裂韧性和硬度,降低了孔隙率,因此,C 涂层具有最佳的抗气蚀性。

更新日期:2022-08-02
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