A comparative study of thermal sprayed Al2O3-TiO2 coatings on PM AISI 316L

IF 5.1 2区工程技术 Q1 ENGINEERING, MULTIDISCIPLINARY

Engineering Science and Technology-An International Journal-Jestech Pub Date : 2024-11-25 DOI:10.1016/j.jestch.2024.101895

Kenan Tankal , Bekir Güney , Mehmet Akif Erden

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Abstract

The widespread use of stainless steels (SS) in various applications is hindered by their inadequate wear resistance, hardness and high density. Structural metallic components fabricated via powder metallurgy (PM) exhibit lower densities compared to those produced by conventional methods due to their inherent high porosity. However, this compromises their mechanical and corrosion performance. This study has investigated the application of pure Al₂O₃ and Al₂O₃ + 13 %TiO2 powders with varying particle sizes on PM AISI 316L substrates to enhance their mechanical and wear properties. The phase composition, microhardness, coating morphology, surface roughness, porosity and wear rate of coated and uncoated samples were comparatively analysed to elucidate the influence of both TiO₂ addition and coating powder particle size on the mechanical properties and surface morphology of the samples. Microstructural and XRD studies confirmed good mechanical and metallurgical bonding of the coatings to the substrate. All of the coated samples exhibited 24 to 34 times higher surface roughness and 1.3 to 2.1 times lower porosity values compared to the substrate. The finer sized TiO₂ added alumina-based coating powder reduced the surface roughness and porosity value to 1.8 and 1.4 times respectively while the use of the coarser sized one reduced these values to 1.3 and 1.2 times respectively compared to the pure Al₂O₃ coated surface. 8-times higher hardness and 70-times lower wear rate values compared to the substrate were the most significant improvements observed in the pure Al₂O₃ coated surface among all coated samples. Although TiO₂ addition to the coating powder decreased hardness by 1.1 times and increased wear rate by 1.8 times, spraying finer TiO₂ added coating powders resulted in a slight improvement in both hardness and wear resistance compared to the coarser one.

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PM AISI 316L 上热喷涂 Al2O3-TiO2 涂层的比较研究

不锈钢（SS）的耐磨性、硬度和高密度不足，阻碍了其在各种应用中的广泛使用。与传统方法相比，通过粉末冶金（PM）制造的结构性金属部件由于其固有的高孔隙率而表现出较低的密度。然而，这也影响了它们的机械和腐蚀性能。本研究调查了不同粒度的纯 Al2O3 和 Al2O3 + 13 %TiO2 粉末在粉末冶金 AISI 316L 基材上的应用，以提高其机械和磨损性能。对涂层和未涂层样品的相组成、显微硬度、涂层形貌、表面粗糙度、孔隙率和磨损率进行了比较分析，以阐明 TiO2 添加量和涂层粉末粒度对样品机械性能和表面形貌的影响。微观结构和 XRD 研究证实了涂层与基体之间良好的机械和冶金结合。与基底相比，所有涂层样品的表面粗糙度提高了 24 至 34 倍，孔隙率降低了 1.3 至 2.1 倍。与纯 Al2O3 涂层表面相比，添加了氧化铝的较细二氧化钛涂层粉末将表面粗糙度和气孔率值分别降低到 1.8 倍和 1.4 倍，而使用较粗的涂层粉末则将这些值分别降低到 1.3 倍和 1.2 倍。与基底相比，纯 Al2O3 涂层表面的硬度提高了 8 倍，磨损率降低了 70 倍，这是在所有涂层样品中观察到的最显著的改进。虽然在涂层粉末中添加 TiO2 会使硬度降低 1.1 倍，磨损率增加 1.8 倍，但与较粗的涂层粉末相比，喷涂较细的添加 TiO2 的涂层粉末会使硬度和耐磨性略有提高。

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来源期刊

Engineering Science and Technology-An International Journal-Jestech Materials Science-Electronic, Optical and Magnetic Materials

CiteScore

11.20

自引率

3.50%

发文量

153

审稿时长

22 days

期刊介绍： Engineering Science and Technology, an International Journal (JESTECH) (formerly Technology), a peer-reviewed quarterly engineering journal, publishes both theoretical and experimental high quality papers of permanent interest, not previously published in journals, in the field of engineering and applied science which aims to promote the theory and practice of technology and engineering. In addition to peer-reviewed original research papers, the Editorial Board welcomes original research reports, state-of-the-art reviews and communications in the broadly defined field of engineering science and technology. The scope of JESTECH includes a wide spectrum of subjects including: -Electrical/Electronics and Computer Engineering (Biomedical Engineering and Instrumentation; Coding, Cryptography, and Information Protection; Communications, Networks, Mobile Computing and Distributed Systems; Compilers and Operating Systems; Computer Architecture, Parallel Processing, and Dependability; Computer Vision and Robotics; Control Theory; Electromagnetic Waves, Microwave Techniques and Antennas; Embedded Systems; Integrated Circuits, VLSI Design, Testing, and CAD; Microelectromechanical Systems; Microelectronics, and Electronic Devices and Circuits; Power, Energy and Energy Conversion Systems; Signal, Image, and Speech Processing) -Mechanical and Civil Engineering (Automotive Technologies; Biomechanics; Construction Materials; Design and Manufacturing; Dynamics and Control; Energy Generation, Utilization, Conversion, and Storage; Fluid Mechanics and Hydraulics; Heat and Mass Transfer; Micro-Nano Sciences; Renewable and Sustainable Energy Technologies; Robotics and Mechatronics; Solid Mechanics and Structure; Thermal Sciences) -Metallurgical and Materials Engineering (Advanced Materials Science; Biomaterials; Ceramic and Inorgnanic Materials; Electronic-Magnetic Materials; Energy and Environment; Materials Characterizastion; Metallurgy; Polymers and Nanocomposites)