热喷涂技术最新文献_第7页

Hybrid Additive Manufacturing Technology—Induction Heating Cold Spray 混合增材制造技术-感应加热冷喷涂

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/asm.cp.itsc2021p0107

R. Ortiz-Fernandez, B. Jodoin

引用次数: 0

Novel Liquid Fuel HVOF Torches Fueled with Ethanol: Optimization and Erosion Wear Response of Cr3C2-NiCr Coatings 以乙醇为燃料的新型液体燃料HVOF火炬:Cr3C2-NiCr涂层的优化及冲蚀磨损响应

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/asm.cp.itsc2021p0079

Shaowu Liu, M. Molière, H. Liao

{"title":"Novel Liquid Fuel HVOF Torches Fueled with Ethanol: Optimization and Erosion Wear Response of Cr3C2-NiCr Coatings","authors":"Shaowu Liu, M. Molière, H. Liao","doi":"10.31399/asm.cp.itsc2021p0079","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0079","url":null,"abstract":"\u0000 In this work; a novel liquid fuel HVOF process fueled with ethanol was used to prepare 75wt%Cr3C2–25wt%NiCr coatings on AISI304 stainless steel substrate. Taguchi method was employed to optimize the spray parameters (ethanol flow rate; oxygen flow rate; powder feed rate and standoff distance) to achieve better erosion resistance at 90° impact angle. The results indicated that ethanol flow rate and oxygen flow rate were identified as the highly contributing parameters on the erosion wear loss. The important sequence of the spray parameter is ethanol flow rate > oxygen flow rate > standoff distance > powder feed rate. The optimal spray parameter (OSP) for minimum erosion wear loss was obtained under ethanol flow rate of 28slph; oxygen flow rate of 420slpm; powder feed rate of 76.7 g/min and standoff distance of 300mm. The phase composition; microstructure; hardness; porosities; and the erosion wear behaviors of the coatings have been studied in detail. Besides; erosion wear testing of the optimized coating was conducted at 30°; 60° and 90° impact angle using air jet erosion testing machine. The SEM images of the erodent samples were taken to analyze the erosion mechanism.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75505831","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

Oxygen Permeability and Its Role in Governing Life of YbDS Environmental Barrier Coatings 氧渗透性及其对YbDS环境屏障涂层寿命的影响

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/asm.cp.itsc2021p0023

Sonia Singh, M. Nganbe, Kuiying Chen

{"title":"Oxygen Permeability and Its Role in Governing Life of YbDS Environmental Barrier Coatings","authors":"Sonia Singh, M. Nganbe, Kuiying Chen","doi":"10.31399/asm.cp.itsc2021p0023","DOIUrl":"https://doi.org/10.31399/asm.cp.itsc2021p0023","url":null,"abstract":"\u0000 The growth kinetics of thermally grown oxide (TGO) silica in Yb-disilicate (YbDS) environmental barrier coatings (EBCs) significantly affects the durability of EBCs. The oxygen permeability can control the TGO growth kinetics and thus could play an essential role in determining EBCs life. Therefore; the oxygen permeability constant of YbDS and TGO is systematically evaluated and quantified in terms of thermodynamics using defect reactions and the parabolic rate constant (kp); respectively. Dry oxygen and wet oxygen conditions as well as different temperatures; partial pressures and top coat modifiers are investigated. The results offer evidence that the oxygen permeability constant for the YbDS top coat is an order of magnitude higher than for the TGO. As such; the TGO hinders the oxidant diffusion stronger; proving to be the diffusion rate controlling layer. Moreover; water vapor strongly increases the oxygen permeability with defect reactions playing a key role. It is suggested that the mass transfer through the top coat is primarily by outward ytterbium ion diffusion and inward oxygen ion movement; with the latter being dominant; particularly in wet environments. The effect of top coat modifiers on oxidant permeation is composition sensitive and seems to be related to their interaction with oxygen ions and their mobility.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90374942","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

Hybrid Metallic Coatings on Polymer-Based Composites 聚合物基复合材料的杂化金属涂层

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/asm.cp.itsc2021p0611

Panteha Fallah, S. Yue, A. McDonald

引用次数: 1

Potential of Suspension Spraying for Development of Dense WC-12Co Coatings 悬浮喷涂技术在WC-12Co致密涂层中的应用前景

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/ASM.CP.ITSC2021P0508

F. Toma, O. Kunze, A. Meyer, A. Potthoff, M. Mayer, J. Pötschke

引用次数: 1

A New One-Step Deposition Approach for a Low Friction Graphene Nanoflakes Coating 低摩擦石墨烯纳米片涂层的一步沉积新方法

热喷涂技术 Pub Date : 2021-06-15 DOI: 10.31399/ASM.CP.ITSC2021P0676

Taki Aissou, J. Veilleux, N. Braidy

引用次数: 0

Characterization of Lithium Phosphate Deposit by Atmospheric Plasma Spraying 大气等离子喷涂表征磷酸锂沉积

热喷涂技术 Pub Date : 2021-05-28 DOI: 10.31399/asm.cp.itsc2021p0682

Yina Sun, Zheng Wei, Xiao-Tao Luo, Chang-jiu Li

引用次数: 0

The Effect of Water Absorption in Ceramic Coatings on High Frequency ac Resistance 陶瓷涂层中吸水性对高频交流电阻的影响

热喷涂技术 Pub Date : 2021-05-28 DOI: 10.31399/ASM.CP.ITSC2021P0315

K. Bobzin, W. Wietheger, E. Burbaum

{"title":"The Effect of Water Absorption in Ceramic Coatings on High Frequency ac Resistance","authors":"K. Bobzin, W. Wietheger, E. Burbaum","doi":"10.31399/ASM.CP.ITSC2021P0315","DOIUrl":"https://doi.org/10.31399/ASM.CP.ITSC2021P0315","url":null,"abstract":"\u0000 Thermally sprayed ceramic coatings can be used for wear protection as well as thermal and electrical insulation. When exposed to environments with high humidity, the water absorption of the ceramic coating has a tremendous impact on the electrical insulation. In thermally sprayed ceramic coatings, water can easily be absorbed by the porous microstructure of the coating. A general result of the water absorption is the reduction of the dc resistivity. However, in the high frequency regime of ac loads, contrary results were observed for sealed Al2O3 coatings on steel substrates. Specimens exposed to high air humidity have shown an increased ac resistance compared to dry specimens if frequencies above 1 MHz are considered. To analyse this phenomenon, a novel measurement technique was developed to investigate the influence of the water absorption of detached ceramic coatings on the ac resistivity at high frequencies. Moreover, the water absorption of the ceramic is measured gravimetrically. To ensure the results are also applicable to ceramic coatings on substrates, the morphology of the coating was analysed using electron microscopy and compared to reference specimens deposited on steel substrates from [1].","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82087326","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

Strengthening Mechanism of Additively Manufactured Cold Spray Al Deposits under Low Deposition Efficiency 低沉积效率下增材冷喷涂铝层的强化机理

热喷涂技术 Pub Date : 2021-05-28 DOI: 10.31399/asm.cp.itsc2021p0247

Ningsong Fan, R. Jenkins, Pengfei Yu, R. Lupoi, Shuo Yin, J. Cizek

引用次数: 0

Molecular Dynamics Simulations of Titanium Dioxide as Model System for Size Effects in Aerosol Deposition 二氧化钛作为气溶胶沉积尺度效应模式系统的分子动力学模拟

热喷涂技术 Pub Date : 2021-05-28 DOI: 10.31399/ASM.CP.ITSC2021P0354

B. Daneshian, F. Gaertner, Wolfgang E. Weber, T. Klassen, H. Assadi, D. Hoeche

{"title":"Molecular Dynamics Simulations of Titanium Dioxide as Model System for Size Effects in Aerosol Deposition","authors":"B. Daneshian, F. Gaertner, Wolfgang E. Weber, T. Klassen, H. Assadi, D. Hoeche","doi":"10.31399/ASM.CP.ITSC2021P0354","DOIUrl":"https://doi.org/10.31399/ASM.CP.ITSC2021P0354","url":null,"abstract":"\u0000 Up to now, the role of particle sizes on deformation features of ceramic particles in aerosol deposition (AD), is not fully understood. For distinguishing general features, two-dimensional molecular dynamics (MD) simulations are applied to study associated phenomena. The nanoparticles are assumed to have original sizes of 10-300 nm and to impact the substrate at velocities of 100-800 m/s. The applied Lennard-Jones potential for the modelled nanoparticles were adjusted to mimic the mechanical properties of TiO2-anatase. For small particles, the simulations reveal three different impact behaviors of (i) rebounding, (ii) bonding and (iii) fragmentation based on initial size and impact velocity, whereas, the larger ones do not show the bonding behavior. The upper limit of the bonding regime shrinks with increasing particle sizes, the field then diminishing for the largest ones. The different impact phenomena were analyzed by evolution of the stress, strain and temperature fields. Stress and strain field results showed that “localized inelastic deformation” occurred at particle sites spreading from the interface to the substrate to the particle core. Calculated temperature fields show a local rise of around 1200 Kelvin due to the inelastic deformation, which is probably sufficient for thermal activation of further deformation features.","PeriodicalId":70745,"journal":{"name":"热喷涂技术","volume":"122 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-05-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75905738","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