Fracture toughness and cavitation erosion behavior of Fe-based amorphous composite coatings with Ni-coated Al2O3 addition

IF 5.3 2区 材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS
Xinlong Wei , Weifeng Xin , Fanchang Dai , Hushui Hong , Shuhua Lu , Chao Zhang
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Abstract

Fe-based amorphous composite coatings were prepared on 304 stainless steel substrates using atmosphere plasma spraying (APS), aiming to investigate the effect of Ni-coated Al2O3 particles addition on fracture toughness and cavitation erosion behavior of Fe-based composite coatings. The microstructure, phase composition, elastic modulus, microhardness and fracture toughness of the coating were characterized using scanning electron microscopy with energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), microhardness tester and nanoindentation. The cavitation erosion behavior of Fe-based coatings was investigated by ultrasonic vibration cavitation method. Fe-based amorphous composite coatings exhibit a characteristic lamellar microstructure and reveal the presence of amorphous phases along with α-(Fe, Cr), NiO, Ni and Al2O3 crystalline phases. When the content of Ni-coated Al2O3 in coating increases from 0 wt% to 3 wt%, there is slight deterioration in porosity from 3.64 % to 4.75 % and fracture toughness from 2.579 MPa·m1/2 to 2.392 MPa·m1/2, yet an increase in microhardness from 925.4 HV0.5 to 1090.3 HV0.5. The composite coating with 3 wt% Ni-coated Al2O3 demonstrates the peak cavitation resistance and its cumulative mass loss is significantly reduced by 36.4 % compared to the pure Fe-based coating. The cavitation erosion failure of Fe-based amorphous composite coatings is predominantly characterized by the brittle fracture mechanism. The fundamental process driving cavitation erosion damage involves the material peeling and coating delamination instigated by intense micro-jet impact and shock wave propagation. The proposed Fe-based amorphous composite coatings can be applied to improve the anti-cavitation performance of components in contact with high-speed fluids, such as ship propellers and centrifugal pump blades.

Abstract Image

添加镍包覆 Al2O3 的铁基非晶复合材料涂层的断裂韧性和气蚀行为
采用大气等离子喷涂(APS)技术在 304 不锈钢基材上制备了铁基非晶态复合涂层,旨在研究添加镍包覆的 Al2O3 粒子对铁基复合涂层断裂韧性和气蚀行为的影响。采用扫描电子显微镜与能量色散光谱(EDS)、X 射线衍射(XRD)、显微硬度计和纳米压痕法对涂层的微观结构、相组成、弹性模量、显微硬度和断裂韧性进行了表征。采用超声振动空化法研究了铁基涂层的空化侵蚀行为。铁基无定形复合涂层呈现出特征性的片状微观结构,并显示出无定形相与α-(铁、铬)、NiO、Ni 和 Al2O3 结晶相的存在。当涂层中 Ni 包覆 Al2O3 的含量从 0 wt% 增加到 3 wt% 时,孔隙率从 3.64 % 下降到 4.75 %,断裂韧性从 2.579 MPa-m1/2 下降到 2.392 MPa-m1/2,但显微硬度从 925.4 HV0.5 增加到 1090.3 HV0.5。与纯铁基涂层相比,镍包覆 3 wt% Al2O3 的复合涂层具有最高的抗气蚀性能,其累积质量损失显著降低了 36.4%。铁基非晶复合涂层的气蚀失效主要以脆性断裂机制为特征。气蚀破坏的基本过程包括强烈的微射流冲击和冲击波传播引起的材料剥离和涂层分层。所提出的铁基非晶复合涂层可用于提高与高速流体接触的部件(如船舶螺旋桨和离心泵叶片)的抗气蚀性能。
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来源期刊
Surface & Coatings Technology
Surface & Coatings Technology 工程技术-材料科学:膜
CiteScore
10.00
自引率
11.10%
发文量
921
审稿时长
19 days
期刊介绍: Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.
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