热喷涂技术 Pub Date : 2021-05-26 DOI: 10.31399/asm.cp.itsc2021p0214

K. Sakaki, Tomiki Tsubata, Hikaru Isogami, Koki Matsuda

{"title":"Spray Pattern of Aluminum Coatings with the Rectangular Cross-Section Nozzle Calculated by the Computational Fluid Dynamics (CFD) in High-Pressure Cold Spray","authors":"K. Sakaki, Tomiki Tsubata, Hikaru Isogami, Koki Matsuda","doi":"10.31399/asm.cp.itsc2021p0214","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0214","url":null,"abstract":"\u0000 In the cold spray process; cross-sectional shape of the nozzle has a significant effect on spray pattern of coatings. The circular exit nozzle is parabolic in shape. So; spray pattern with the rectangular nozzle is wider than that with the circular spray nozzle. The goal of this investigation is to establish a design for the cold spray gun nozzle to gain more uniform spray profile of coatings. We have investigated the influence of expansion ratio; nozzle total length and the ratio of nozzle length of divergent section and parallel section of rectangular nozzle on behaviors of gas and particle by the computational fluid dynamics (CFD) in high pressure cold spraying. We have studied copper particles so far. In this study; we will examine aluminum particles. First; we investigate the influence of the size and shape of the rectangular section nozzle on the velocity; temperature; and particle distribution of aluminum particles by CFD. After that; the rectangular section nozzles were fabricated and coating formation experiments were conducted; spray patterns and coating cross-sectional structures were observed; and coating adhesion was also evaluated. The nozzle material was polybenzimidazole resin; which is difficult for aluminum particles to attach to nozzle walls.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75963068","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermally Sprayed Coating-Based Heating Systems for Boundary Layer Transition Detection — An Experimental Approach 用于边界层过渡检测的热喷涂涂层加热系统-实验方法

热喷涂技术 Pub Date : 2021-05-26 DOI: 10.31399/ASM.CP.ITSC2021P0765

M. Machulla, S. T. Dehaghani, P. Claussnitzer, S. Scheitz, A. McDonald, C. Leyens

{"title":"Thermally Sprayed Coating-Based Heating Systems for Boundary Layer Transition Detection — An Experimental Approach","authors":"M. Machulla, S. T. Dehaghani, P. Claussnitzer, S. Scheitz, A. McDonald, C. Leyens","doi":"10.31399/ASM.CP.ITSC2021P0765","DOIUrl":"https://doi.org/10.31399/ASM.CP.ITSC2021P0765","url":null,"abstract":"\u0000 Boundary layers on surfaces will change from laminar to turbulent flow after a critical length. Due to the differing heat transfer coefficients of laminar and turbulent flow, the point of transition can be detected by heating the surface and measuring surface temperature by thermographic imaging. Locating the transition point is crucial for the aerodynamic optimization of components. In this study, fiber reinforced polymer composites (FRPCs) were chosen as the test substrate. Experiments were conducted using the flame spray process and NiCrAlY coatings. Multilayered coatings consisting of an aluminum bond coat, a layer of alumina as electrical insulation, and a heating layer of titania were fabricated by atmospheric plasma spraying. Free-flight tests were conducted with a functionalized winglet in order to assess the ability of thermally-sprayed heating elements to detect the location of transition of the flow regime. The results showed that the thermally-sprayed elements heat surfaces uniformly, with sufficient radiation losses for thermographic imaging. It was also shown that the change in temperature at the point of transition was readily observable using thermography.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"5 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89689982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Latest Innovation in Masking Solutions 掩蔽解决方案的最新创新

热喷涂技术 Pub Date : 2021-05-26 DOI: 10.31399/asm.cp.itsc2021p0096

J. Kapur, François-Henri Leroy

引用次数: 0

Formation of Solid Solution and Metallic Nickel Phases During Suspension Plasma Spraying of Co Oxide and Ni Oxide Co氧化物和Ni氧化物悬浮等离子喷涂过程中固溶体和金属镍相的形成

热喷涂技术 Pub Date : 2021-05-26 DOI: 10.31399/asm.cp.itsc2021p0515

V. Jalilvand, A. Dolatabadi, C. Moreau, S. Mohammadkhani, L. Roué, D. Guay

{"title":"Formation of Solid Solution and Metallic Nickel Phases During Suspension Plasma Spraying of Co Oxide and Ni Oxide","authors":"V. Jalilvand, A. Dolatabadi, C. Moreau, S. Mohammadkhani, L. Roué, D. Guay","doi":"10.31399/asm.cp.itsc2021p0515","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0515","url":null,"abstract":"\u0000 The focus of this study is the formation of a solid solution and metallic nickel in the cobalt-nickel mixed oxide coatings during suspension plasma spray (SPS) deposition. The (Co,Ni)O solid solution is a potential material for inert anode applications in aluminum production. SPS coatings and in-flight collected particles are studied to gain further insight into the melting and mixing phenomena of the NiO and CoO powders as well as phase formation in the deposited coatings. Moreover, the role of suspension feedstock particle sizes on the microstructure of coatings is discussed. SEM, EDS and X-ray diffraction studies helped better understanding the formation of different crystalline phases within the as-sprayed coatings. It was found that the formation of metallic nickel is possible in the coatings. The results support the importance of substrate temperature on the formation of metallic Ni, so that keeping the substrate at low temperature results in an increase of the Ni content in the coatings. In this study, possible causes for the formation of metallic Ni during spraying are discussed.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85357184","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ni-5wt% Al Coatings Deposited by Twin Wire Arc Spraying for Molten Aluminum Attack Protection 双线电弧喷涂Ni-5wt% Al熔铝防护涂层

热喷涂技术 Pub Date : 2021-05-26 DOI: 10.31399/asm.cp.itsc2021p0700

Natalia Brizuela-Colmenares

引用次数: 1

3D Microstructure-Based FE Simulation of Cold-Sprayed Al-Al2O3 Composite Coatings under Indentation and Quasi-Static Compression 压痕和准静态压缩下冷喷涂Al-Al2O3复合涂层的三维微观结构有限元模拟

热喷涂技术 Pub Date : 2021-05-25 DOI: 10.31399/ASM.CP.ITSC2021P0386

Saman Sayahlatifi, C. Shao, A. McDonald, J. Hogan

{"title":"3D Microstructure-Based FE Simulation of Cold-Sprayed Al-Al2O3 Composite Coatings under Indentation and Quasi-Static Compression","authors":"Saman Sayahlatifi, C. Shao, A. McDonald, J. Hogan","doi":"10.31399/ASM.CP.ITSC2021P0386","DOIUrl":"https://doi.org/10.31399/ASM.CP.ITSC2021P0386","url":null,"abstract":"\u0000 This study developed microstructure-based finite element (FE) models to investigate the behavior of cold-sprayed aluminum-alumina (Al-Al2O3) metal matrix composite (MMCs) coatings subject to indentation and quasi-static compression. Based on microstructural features (i.e., particle weight fraction, particle size, and porosity) of the MMC coatings, representative volume elements (RVEs) were generated by using Digimat software and then imported into ABAQUS/Explicit. State-of-the-art physics-based modelling approaches were incorporated into the model to account for particle cracking, interface debonding, and ductile failure of the matrix. This allowed for analysis and informing on the deformation and failure responses. The model was validated with experimental results for cold-sprayed Al-18 wt.% Al2O3, Al-34 wt.% Al2O3, and Al-46 wt.% Al2O3 metal matrix composite coatings under quasi-static compression by comparing the stress versus strain histories and observed failure mechanisms (e.g., matrix ductile failure). The results showed that the computational framework is able to capture the response of this cold-sprayed material system under compression and indentation, both qualitatively and quantitatively. The outcomes of this work have implications for extending the model to materials design and under different types of loading (e.g., erosion and fatigue).","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89390149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Analytical and Numerical Modelling of Interfacial Stress Distribution of a Piezoresistive Coating Layer 压阻涂层界面应力分布的分析与数值模拟

热喷涂技术 Pub Date : 2021-05-25 DOI: 10.31399/asm.cp.itsc2021p0372

A. S. Ogunbadejo, A. McDonald, S. Chandra

{"title":"Analytical and Numerical Modelling of Interfacial Stress Distribution of a Piezoresistive Coating Layer","authors":"A. S. Ogunbadejo, A. McDonald, S. Chandra","doi":"10.31399/asm.cp.itsc2021p0372","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0372","url":null,"abstract":"\u0000 Thermally sprayed coatings can be used in structural health monitoring devices where the coatings can reveal defects in the real-time integrity of the component through changes in mechanical, thermal or modal properties during service. In this emerging application, the mechanical properties of the coating are strongly affected by the interfacial bond between the coating and the substrate. This paper presents an analytical study of the interfacial stress distribution based on piezoresistive-stress constitutive relation of a coating layer. Both a single layer coating- and a bilayer coating-substrate system were considered. An analytical solution of the interfacial stress was developed by solving a Fredholm-Volterra singular integro-differential equation of a coating-substrate model using Chebyshev polynomials. Numerical simulation was conducted to analyze the effects of geometric and effective material properties of the coating-substrate system on the interfacial stress distribution. It was found that the susceptibility of the piezoresistive layer to delamination primarily relies on thicknesses of the coating layers and the stiffness of the intermediary insulating layer and substrate.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88915539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cold Spray Technology for Oxidation-Resistant Nuclear Fuel Cladding 抗氧化核燃料包壳的冷喷涂技术

热喷涂技术 Pub Date : 2021-05-25 DOI: 10.31399/asm.cp.itsc2021p0167

T. Dabney, H. Yeom, Kyle Quillin, Nickolas Pocquette, K. Sridharan

引用次数: 1

Effect of Secondary Component Properties when Cold Spraying Mixed Metal Powders on Carbon Fiber Reinforced Polymers 冷喷涂混合金属粉末对碳纤维增强聚合物二次组分性能的影响

热喷涂技术 Pub Date : 2021-05-25 DOI: 10.31399/asm.cp.itsc2021p0157

A. Liberati, H. Che, S. Yue, P. Vo

引用次数: 1

MCrAlX (X = Y, Hf and Si) Bond Coats by Cold Spray for High Temperature Applications 低温喷涂MCrAlX (X = Y, Hf和Si)粘接涂层

热喷涂技术 Pub Date : 2021-05-25 DOI: 10.31399/asm.cp.itsc2021p0036

C. Cojocaru, M. Aghasibeig, E. Irissou

{"title":"MCrAlX (X = Y, Hf and Si) Bond Coats by Cold Spray for High Temperature Applications","authors":"C. Cojocaru, M. Aghasibeig, E. Irissou","doi":"10.31399/asm.cp.itsc2021p0036","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0036","url":null,"abstract":"\u0000 MCrAlX powder compositions (M= Ni; Co and X= Y; Hf; Si or combination) are often thermally sprayed (TS) via vacuum plasma spray (VPS); low pressure plasma spray (LPPS) or high velocity oxy-fuel (HVOF) to produce high temperature oxidation and hot corrosion resistant bond coats (BC) for thermal barrier coatings (TBCs). Cold spray (CS) technology is currently considered as a promising alternative to the traditional TS solutions having the advantage of delivering oxide-free and very dense metallic coatings at relatively lower costs compared to VPS and LPPS. Here; we first present high-pressure CS deposition of NiCoCrAlY and NiCoCrAlYHfSi and discuss the influence of feedstock properties on the deposited BCs. CFD numerical simulation is employed to tailor the spray conditions based on the feedstock characteristics. Secondly; we present the laser assisted cold spray (LACS) deposition of NiCoCrAlYHfSi BCs using a low-pressure CS system. We show that LACS can be successfully used to deposit this particular powder while eliminating nozzle erosion and low deposition efficiency disadvantages observed during conventional CS. Lastly; high temperature isothermal oxidation of a TBC architecture having LACS BC is presented.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90022154","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

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