Gotowe bibliografie tematyczne / HVOF SPRAYED

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Gotowa bibliografia na temat „HVOF SPRAYED”

Autor: Grafiati

Data publikacji: 11 września 2023

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Artykuły w czasopismach na temat "HVOF SPRAYED"

Ishikawa, Yasunari, Jin Kawakita i Seiji Kuroda. "Development of Corrosion and Wear Resistant Coatings by an Improved HVOF Spraying Process". Materials Science Forum 475-479 (styczeń 2005): 237–40. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.237.

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We have developed an improved HVOF spray process called “Gas-shrouded HVOF” (GS-HVOF) over the past several years. By using an extension nozzle at the exit of a commercial HVOF spray gun, GS-HVOF is capable of controlling the oxidation of sprayed materials during flight as well as achieving higher velocity of sprayed particles. These features result in extremely dense and clean microstructure of the sprayed coatings. The process has been successfully applied to corrosion resistant alloys such as SUS316L, Hastelloy C, and alloy 625 as well as cermets such as WC-Cr3C2-Ni. The spray process, coatings microstructure and property evaluation will be discussed with potential industrial applications in the near future.

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Itoh, Y., M. Saitoh i M. Tamura. "Characteristics of MCrAlY Coatings Sprayed by High Velocity Oxygen-Fuel Spraying System". Journal of Engineering for Gas Turbines and Power 122, nr 1 (30.07.1999): 43–49. http://dx.doi.org/10.1115/1.483173.

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High velocity oxygen-fuel (HVOF) spraying system in open air has been established for producing the coatings that are extremely clean and dense. It is thought that the HVOF sprayed MCrAlY (M is Fe, Ni and/or Co) coatings can be applied to provide resistance against oxidation and corrosion to the hot parts of gas turbines. Also, it is well known that the thicker coatings can be sprayed in comparison with any other thermal spraying systems due to improved residual stresses. However, thermal and mechanical properties of HVOF coatings have not been clarified. Especially, the characteristics of residual stress, that are the most important property from the view point of production technique, have not been made clear. In this paper, the mechanical properties of HVOF sprayed MCrAlY coatings were measured in both the case of as-sprayed and heat-treated coatings in comparison with a vacuum plasma sprayed MCrAlY coatings. It was confirmed that the mechanical properties of HVOF sprayed MCrAlY coatings could be improved by a diffusion heat treatment to equate the vacuum plasma sprayed MCrAlY coatings. Also, the residual stress characteristics were analyzed using a deflection measurement technique and a X-ray technique. The residual stress of HVOF coating was reduced by the shot-peening effect comparable to that of a plasma spray system in open air. This phenomena could be explained by the reason that the HVOF sprayed MCrAlY coating was built up by poorly melted particles. [S0742-4795(00)00701-8]

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Torkashvand, Kaveh, Shrikant Joshi i Mohit Gupta. "Advances in Thermally Sprayed WC-Based Wear-Resistant Coatings: Co-free Binders, Processing Routes and Tribological Behavior". Journal of Thermal Spray Technology 31, nr 3 (luty 2022): 342–77. http://dx.doi.org/10.1007/s11666-022-01358-4.

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AbstractA growing understanding of wear behavior of various thermally sprayed ceramic–metallic matrix coatings has occurred over recent years. This has resulted from the continuous evolution in spraying methods as well as material feedstock, and the corresponding new aspects of the field that have been thoroughly explored. This paper aims to review recent developments in thermally sprayed tungsten carbide-based coatings, with specific emphasis on evaluating alternative binders, processing routes and tribological behavior of the coatings. A comprehensive evaluation of various compositions as binders for WC-based coatings, considering environmental concerns and market requirements has been carried out. The properties and performance of various potential alternatives for cobalt as a conventional binder for these coatings have been assessed. Moreover, different thermal spray methods have been reviewed, particularly highlighting the role of processing parameters, phase change and feedstock characteristics in the high-velocity oxy-fuel (HVOF) and high-velocity air fuel (HVAF) techniques. A comparison is made between HVAF and HVOF coatings in terms of their performance under different wear environments. Finally, various scenarios of material removal in HVAF and HVOF coatings, under various wear conditions, have also been reviewed.

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Meekhanthong, K., i S. Wirojanupatump. "Characterization and Comparison of Thermally Sprayed Hard Coatings as Alternative to Hard Chrome Plating". Advanced Materials Research 974 (czerwiec 2014): 183–87. http://dx.doi.org/10.4028/www.scientific.net/amr.974.183.

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Thermal spray coatings have become one of the most potential for hard chrome replacement, particularly for wear and corrosion applications. In this study four types of hard coating materials were selected and thermally sprayed by suitable processes as the following designated codes (material/spray technique): Cr-Fe/HVOF, Cr-Ni/HVOF, WC-Ni/SF and Cr-Fe/AS. All of starting materials were characterized in order to create a correlation between spray materials and coating characteristics. SEM was employed for morphology and microstructure investigation. Particle size analysis was investigated by SEM and laser particle size analyzer. Coating characterization included surface roughness measurment by profilometer, porosity evaluation by image analysis and hardness test by Vicker microhardness tester. Microstructure of coatings was also revealed by SEM. Wear performance was evaluated by pin on disc test and dry sand rubber wheel abrasion test. Corrosion resistance was tested by potentiodynamic method. The results showed that particle size and morphology of starting powders were various depending on manufacturing method. Chemical compositions of starting materials showed great effect on coating properties and performance. Coatings deposited by HVOF and spray & fuse (SF) method showed typically dense and homogeneous structure than arc sprayed coating. WC-Ni/SF coating showed lowest abrasive wear rate compared to other thermally sprayed coatings. All Ni base coatings had significantly lower corrosion rates while Cr-Ni/HVOF coating had lowest corrosion rate. Although Cr-Ni/HVOF and WC-Ni/SF could be applicable for both wear and corrosion applications, for heat sensitive parts, Cr-Ni/HVOF coating could be a better alternative to spray and fuse.

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Ma, Ning, Zhen Xiong Cheng, Huan Tao Wu i Fu Xing Ye. "Influence of Powder Structure on Decarburization and Microstructure of HVOF Sprayed WC-12wt.%Co Coatings". Advanced Materials Research 834-836 (październik 2013): 609–12. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.609.

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In order to examine the influences of tungsten carbide particle size on decarburization behavior and microstructure of HVOF sprayed WC-Co coating, four kinds of agglomerated WC-12wt.%Co powders were deposited on mild steel substrates by using a high velocity oxy-fuel (HVOF) spray system. The phase compositions and microstructure of the feedstock powders and sprayed coatings were investigated by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM), respectively. The results showed that the decarburization became more serious with the decreasing of tungsten carbide particle size in the starting powder. W phase was detected in the as-sprayed nanocomposite WC-12wt.%Co coating. All the coatings showed very compact microstructure with the hard phases embedded in Co matrix. The microstructure of HVOF sprayed WC-12wt.%Co coatings depended on the feedstock powder structure. The shape of tungsten carbide particles was rounder and the volume fraction of carbide phase decreased in coatings as the tungsten carbide particle size decreased.

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Zha, Bai Lin, Su Lei Qiao, Ding Yuan Huang, Wei He, Zhi Hong Zha i Xiang Bin Li. "Study of Properties of Nanostructured and Conventional WC-12Co Coatings Deposited by HVO/AF". Advanced Materials Research 709 (czerwiec 2013): 166–71. http://dx.doi.org/10.4028/www.scientific.net/amr.709.166.

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The three kinds of WC-12Co coatings were sprayed by High Velocity Oxygen/Air Fuel Spray (HVO/AF) in three different spray conditions, HVOF、HVO-AF and HVAF. The high velocity flame flow was produced by HVO/AF with the burning of kerosene and propellant which was mixed by oxygen and air at different ratio, it can be controlled from 1400°C to 2800°C.The microstructure was investigated by SEM, the phase composition was tested by XRD, and the microhardness and elastic modulus of coatings were investigated. The results indicate that the coatings with better adhesive strength and little porosity than conventional ones are dense and have a large value of elasticity and a high microhardness which is 0.4 times harder than the conventional coatings. The coatings are mainly composed of WC and Co, and there are also traces of W2C and Co6W6C. As temperature decreased, the decomposition of WC is being reduced.

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Laha, T., Y. Liu i A. Agarwal. "Carbon Nanotube Reinforced Aluminum Nanocomposite via Plasma and High Velocity Oxy-Fuel Spray Forming". Journal of Nanoscience and Nanotechnology 7, nr 2 (1.02.2007): 515–24. http://dx.doi.org/10.1166/jnn.2007.114.

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Free standing structures of hypereutectic aluminum-23 wt% silicon nanocomposite with multiwalled carbon nanotubes (MWCNT) reinforcement have been successfully fabricated by two different thermal spraying technique viz Plasma Spray Forming (PSF) and High Velocity Oxy-Fuel (HVOF) Spray Forming. Comparative microstructural and mechanical property evaluation of the two thermally spray formed nanocomposites has been carried out. Presence of nanosized grains in the Al–Si alloy matrix and physically intact and undamaged carbon nanotubes were observed in both the nanocomposites. Excellent interfacial bonding between Al alloy matrix and MWCNT was observed. The elastic modulus and hardness of HVOF sprayed nanocomposite is found to be higher than PSF sprayed composites.

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Prashar, Gaurav, Hitesh Vasudev i Lalit Thakur. "Influence of heat treatment on surface properties of HVOF deposited WC and Ni-based powder coatings: a review". Surface Topography: Metrology and Properties 9, nr 4 (1.12.2021): 043002. http://dx.doi.org/10.1088/2051-672x/ac3a52.

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Abstract Post-spray treatments have recently been popular as a means of improving the overall quality of thermally sprayed coatings, particularly those done using the HVOF technique. Thermally assisted surface treatment of deposited coatings is an effective way to improve the characteristics of coated components for specific applications. The tribomechanical properties of post-treated WC and Ni-based coatings deposited with high-velocity oxy-fuel (HVOF) technique have been addressed. The structure-property correlations concerning the as-sprayed and post-treated coatings have been considered to understand the various mechanisms responsible for improved performance in terms of wear and corrosion resistance. The recent advancement in the post-treatments such as post-processing using microwave hybrid heating, laser-assisted processing and Stationary friction processing have been incorporated in the current review. Comparative studies have been presented to understand the structure-property relationship and performance of WC and Ni-based HVOF sprayed coatings with the help of various characterization techniques in this review article.

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Saghi Beyragh, Mohammad Reza, Shahin Khameneh Asl, Rahim Vasfpour, Farshid Tazesh i Parisa Khallagi. "A Comparison between the Corrosion Resistances of High Velocity Oxy Fuel (HVOF) Sprayed Coatings and Hard Chromium Coatings". Materials Science Forum 673 (styczeń 2011): 173–78. http://dx.doi.org/10.4028/www.scientific.net/msf.673.173.

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HVOF-sprayed coatings (WC–17%Co) and hard chromium coatings corrosion resistances have been compared through electrochemical polarization test in 3.5% NaCl solution. WC–17%Co alloy coatings were deposited on mild steel substrates by High Velocity Oxy-Fuel (HVOF) spray process. The layers of standard and crack free hard chromium coatings were prepared by using Direct Current (DC) and Pulse Current (PC) electroplating process on the mild steel substrates. Hard chromium coatings was characterized as a reference material, to verify whether HVOF-sprayed coatings are suitable as a hard chromium coatings replacement. The microstructure of the coatings was examined by OM, SEM and XRD. Standard hard chromium coatings passivate in NaCl environment, but crack free hard chromium coatings were prepared by using Pulse Current (PC) electroplating do not passivate. The lowest corrosion current densities (Icorr) were recorded for crack free hard chromium coatings. Comparative electrochemical test results showed that, the Standard hard chromium coating has the highest Icorr and were significantly damaged after the electrochemical tests. It is seem to be that WC–17%Co alloy coatings can be substituted for standard hard chromium coatings but crack free chromium coatings bring new challenge for HVOF-sprayed coatings!

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Rozprawy doktorskie na temat "HVOF SPRAYED"

Mercier, Dominic. "Oxidation behavior of nanostructured CoNiCrAlY and NiCoCrAlY sprayed by HVOF". Thesis, McGill University, 2010. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86775.

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In recent years, much development has been made in the world of nanotechnologies. Hence, nanomaterials, which possess unique characteristics and excellent mechanical properties, are now being used in innovative and advanced applications. Despite the incredible potential of nanomaterials, their use is still at an embryonic stage as a result of the difficulty to mass-produce them. Among the potentially viable application remains the fabrication of nanostructured powders to produce high temperature oxidation resistance coatings.
Nanostructured coatings were obtained by thermally spraying cryomilled CoNiCrAlY and NiCoCrAlY feedstock using the HVOF technique. It was found that the milling process used to prepare the powder significantly altered the microstructure of the alloy. In addition to achieving grain size refinement, significant aluminum segregation at grain boundaries was observed. Upon oxidation experiments up to 96 hours in static air at 1000°C an oxide scale composed of an adherent and dense α-Al2O3 inner layer with a top layer of fast growing oxides such as NiO, Cr2O3, CoAl2O4 and NiAl2O4 evolved from the coatings. It was found that the formation of a two-layer scale could be prevented through surface grinding prior to oxidation. Moreover, the comparison of the oxidation results of the powders and those of the coatings revealed that the spraying process has a considerable influence on the oxidation behavior of MCrAlYs attributable to the formation of oxide seeds during the spraying process.
Au cours des dernières années, plusieurs avancements ont vu le jour au niveau des nanotechnologies. L'émergence des métaux nanostructurés, possédant des charactéristiques inédites ainsi que des propriétés méchaniques amplement supérieures à celles des métaux conventionnels, a contribuée à leur utilisation pour de nouvelles applications. Malgré le potentiel immense de la nanotechnologie dans le monde des matériaux, l'utilisation de ces maérieux est encore limitée dû à la difficulté de les produire à grande échelle. Cependant, l'une de ces utilisations prometteuses consiste en le développement de poudre nanostructurée destinée à la production de revêtements résistant à l'oxidation à haute temperature.
Le comportement de revêtements nanostructués obtenus par projection thermique à partir de poudres de CoNiCrAlY et de NiCoCrAlY broyées cryogéniquement a été étudié dans un atmosphère oxidant. Il a été démontré que l'étape de broyage modifie considérablement la microstructure des poudres; en plus de réduire la taille de grain, le broyage a mené à une ségrégation de l'aluminum aux joints de grains. Cela a eu pour effet de favoriser la croissance d'une couche protectrice de α-Al2O3, bien adhérée et de bonne qualité lorsque les revêtemens ont été oxidés à une température de 1000°C pour des périodes allant jusqu'à 96 heures. Une seconde couche d'oxides à croissance rapide tels que NiO, Cr2O3, CoAl2O4 and NiAl2O4 a également été observée. Par contre, il a été démontré que cette dernière ne croît pas si la surface des revêtements est polie avant l'oxidation. De plus, en comparant les résultats des tests d'oxidation des poudres avec ceux des revêtements il a été démontré que la simple projection thermique des poudres influence les résultats d'oxidation due à la formation d'oxides durant la projection.

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Abdollah, Sabrina. "Evaluating properties of corrosion resistance in thermal-sprayed (HVOF) coatings". Thesis, University of Manchester, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490179.

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Thermal sprayed coatings had increased interest in surface engineering for applications in aggressive aqueous corrosive environments. With the advent of the high-velocity oxy-fuel (HVOF) spray process, thermal-sprayed coatings have gained popularity and are being studied extensively for their corrosion-resistant properties. It is a technique for enhancing the components and aircraft landing gear systems. The main aim of this research project is to improve the anti-corrosion (barrier) properties of hard thermal-sprayed coatings. X The coatings provided by the research project's partner, Greenhey Industrial Services, Skelmersdale, UK, are high performance coatings, which offer high hardness, non-sacrificial nature and tend to accelerate substrate corrosion at local defects. >< Over the duration of this 3-year research project, several experimental work were carried out to study those characteristics that impact upon coating porosity and determine whether these experime!ltal methods can be used as a tool to determine the coating porosity of thermal sprayed coatings on a metal substrate. Initial experimental work carried out to investigate the properties of the thermal sprayed coatings in 3 different solutions, both in aerated & deaerated conditions. Different compositions of the coatings WClOC04Cr, WCl7Co and WCl2Co have been carried out in these solutions in both AC impedance & DC polarisation experimental work produced an inconclusive results. Similar experimental methods were carried out in a controlled environment only on \V'ClOC04Cr coating with different coating thicknesses (that is 2thous, 6thou, lOthou & l5thou) on both mild steel and stainless steel substrates in deaerated buffer acetate solution at pH - 4.5. Scanning electron microscopy (SEM) work was also been carried out on crosssectioned as-sprayed and ground finishing coatings and their respective salt sprayed specImens. Many parameters can be considered to improve the corrosion resistance of thermal sprayed coatings such as the powder particles size, type of gun used for the thermal sprayed process, the composition of the powder particles and the type of substrate used. All these process alterations can influence upon the barrier (anticorrosion) performance of the coatings. Although initially, it was envisaged to carry out a comprehensive research work, the limited as-received samples deter the progress. Nevertheless, various attempts were made to rank the coatings' corrosion performance in identifying the optimal condition.

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Jones, Mark. "Properties of HVOF sprayed TiC and TiB2-based cermet coatings". Thesis, University of Nottingham, 2002. http://eprints.nottingham.ac.uk/12353/.

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This work reports research concerning the properties of cermet coatings deposited by high velocity oxy-fuel spraying, which are designed to exhibit resistance to abrasive wear and high-temperature oxidation. Cermet powders have been produced by self-propagating high-temperature synthesis (SHS) reaction of elemental powder mixtures of Fe, Cr, Ti and C or B, to produce a cermet, containing an Fe(Cr) binder phase and a hard ceramic phase, TiC or TiB2. The Ti and C content in the powder mixtures were varied in order to evaluate the effect of the C: Ti ratio of TiC on the overall integrity of three different feedstock powders and coatings produced. Four cermet coatings were produced from these SHS powders, one TiB2-based and three TiC-based. Abrasive wear resistance of the coatings was evaluated using a dry sand rubber wheel (DSRW) abrasive wear testing machine, where the coatings were subjected to abrasion by both alumina and silica abrasives. The TiB2-based coating exhibited superior wear resistance when subjected to both alumina and silica. Of the TiC-based coatings, the equimolar coating exhibited superior resistance when subjected to alumina, and the excess Ti coating exhibited superior wear resistance when subjected to abrasion with silica. When compared with coatings produced from commercially available powders, namely, sintered and crushed WC-Co and blended NiCr-Cr3C2, the coatings produced from SHS powders exhibited comparable, and in some cases, better abrasive wear properties. Preliminary oxidation tests showed that all four coatings performed well at 500°C (the temperature at which WC-Co begins to degrade rapidly). They exhibited some oxidation at 700°C, and at 900°C, exhibited severe oxidation.

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Nahvi, Saied Mehran. "Abrasive wear behaviour of steels and advanced HVOF-sprayed WC-M coatings". Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12118/.

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This thesis concerns a study of the three-body abrasive wear behaviour of two groups of materials with different abrasive particles using the Dry Sand Rubber Wheel (DSRW) test method. This investigation can be divided into three sections: In the first section, the abrasion of a range of steels with an ash from a biomass power station was compared with that observed for abrasion with a conventional silica abrasive. It was seen that the wear rate of the steels when abraded with silica increased in proportion to the applied load and decreased with the hardness of the steel. However, the bottom-ash was more friable than the silica abrasive, and as such, significantly more abrasive crushing was observed during the tests with the bottom-ash abrasive. It is proposed that the wear is dominated by abrasion by the larger particles in the distribution, and that damage is limited by the maximum load which the particles can sustain before failing. In the second section, the motion of particles in the DSRW test with silica abrasive against a range of steels, as a function of applied load and the hardness of the steels was studied. The results showed that particle rolling through the contact is favoured by low applied loads and low testpiece hardness whereas particle sliding through the contact is favoured by high applied loads and high testpiece hardness. A model was proposed to provide an analysis of the motion of particles in the DSRW test. The effect of hardness on particle rotation is well predicted by the model, but the effect of the applied load on particle motion observed experimentally is opposite to that which is predicted by the model. The shortcomings of the model are discussed, and the model has been qualitatively modified to account for this discrepancy. In the third section, five different WC-metal cermet powders were deposited as coatings by HVOF thermal spraying. These were a WC-nickel alloy, a WC-iron alloy and three types of WC-Co powders with different carbide grain sizes. Characterisation of the coatings showed decomposition of WC during spray process for all the coatings. The results show different solubilities of W and C in the binders and different precipitation characteristics. DSRW tests were performed to assess the wear resistance of the coatings with silica and alumina abrasives. It was found that the coatings had different wear rates and mechanisms when abraded with silica compared with alumina. The differences in the wear behaviour of the coatings are due to the differences in powder characteristics, the extent of reaction and decarburisation during spraying, and the subsequent development of the microstructure in the coating during splat solidification at high cooling rates.

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Wirojanupatump, Sittichai. "Characterisation and wear performance of HVOF sprayed Cr-xC-y-NiCr coatings". Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311718.

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Shrestha, Suman Kumar. "Corrosion and erosion-corrosion of High Velocity Oxy-Fuel (HVOF) sprayed NiCrSiB coatings". Thesis, University of Glasgow, 2000. http://theses.gla.ac.uk/2866/.

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Saeidi, Saman. "Microstructure, oxidation & mechanical properties of as-sprayed and annealed HVOF & VPS CoNiCrAIY coatings". Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/11731/.

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Three HVOF and a VPS CoNiCrAlY coating were sprayed using Praxair CO-210-24 and Sulzer Metco Amdry 9951 powders. All coatings were subject to vacuum annealing treatments at different temperatures for different exposure times in order to achieve equilibrium microstructures in all test samples. Both HVOF and VPS, as sprayed and heat treated coatings were oxidised at 850°C and 1100°C for periods of up to 250 hours. Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD) and laser diffraction powder size analyses were used in order to analyse the powder particle size distribution and characterise the microstructure of the as-received powders, as-sprayed coatings and annealed and oxidised coatings. Thermogravimetric analysis (TGA) was carried out on as-sprayed and heat treated HVOF and VPS coatings at 1100°C for 96 hours in order to compare the oxidation rate of HVOF and VPS coatings and investigate the effect of microstructure and heat treatment on the oxidation rate of both types of coatings. Furthermore, micro hardness, nano hardness and dynamic mechanical analysis (DMA) with a 3-point bend clamp were used in order to study the hardness and Young’s modulus of as-sprayed and annealed HVOF and VPS coatings. The Eshelby inclusion model and image analyses were used in order to further investigate the effect of microstructure on the mechanical properties of these coatings. It was observed that heat treatment prior to oxidation will change the dual oxide layer observed for the as-sprayed oxidised coatings to a single alumina layer for the heat treated and oxidised coatings. Furthermore, it was observed that microstructural features such as porosity and oxide stringers have an effect on the oxidation rate of coatings. A model was presented indicating the role of oxide stringers and porosity on the resulting heat treated microstructure and oxidation rate. It was also understood that the beginning stage of oxidation can play an important role on the oxidation behaviour (oxidation rate and different oxides present) of both HVOF and VPS coatings. It was observed that annealing will change the microstructure of the coatings and affect their mechanical properties. It was seen that annealing reduced the hardness of the thermally sprayed coatings while it had increased the Young’s modulus of the coatings. It was also observed that features such as porosity levels and β volume fraction have an effect on the mechanical properties of the coatings.

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Kutschmann, Pia, Thomas Lindner, Kristian Börner, Ulrich Reese i Thomas Lampke. "Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings". MDPI AG, 2019. https://monarch.qucosa.de/id/qucosa%3A34775.

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Gas nitriding is known as a convenient process to improve the wear resistance of steel components. A precipitation-free hardening by low-temperature processes is established to retain the good corrosion resistance of stainless steel. In cases of thermal spray coatings, the interstitial solvation is achieved without an additional surface activation step. The open porosity permits the penetration of the donator media and leads to a structural diffusion. An inhomogeneous diffusion enrichment occurs at the single spray particle edges within the coating’s microstructure. A decreasing diffusion depth is found with increasing surface distance. The present study investigates an adjusted process management for low-temperature gas nitriding of high velocity oxy-fuel-sprayed AISI 316L coatings. To maintain a homogeneous diffusion depth within the coating, a pressure modulation during the process is studied. Additionally, the use of cracked gas as donator is examined. The process management is designed without an additional surface activation step. Regardless of surface distance, microstructural investigations reveal a homogeneous diffusion depth by a reduced processing time. The constant hardening depth allows a reliable prediction of the coatings’ properties. An enhanced hardness and improved wear resistance is found in comparison with the as-sprayed coating condition.

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Elo, Robin. "Evaluation of HVAF sprayed STR coatings". Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-176954.

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The Seamless Stressometer® roll (Seamless STR) is used to measure the flatness of aluminum and steel strip when there is an extreme demand on the surface finish. To protect the roll and strip, the roll is coated with two layers deposited by high velocity oxygen fueled spraying (HVOF), Cr-Ni(Si,B) closest to the roll and WC-Co on top. This solution has several disadvantages; high cost and complicated logistics, corrosion sensitivity and high residual stresses creates the need for two coatings which in turn complicates the process. Cobalt is, in addition, sensitive to low pH coolants and environmentally unfriendly. These problems have given rise to the idea of switching both the method and material of the coating. In the first part of this work, high velocity air fueled spraying (HVAF) was evaluated as an alternative deposition method. Three materials, Cr3C2-NiCr, WC-Co and WC-CrC-Ni were deposited on steel coupons with varying chamber pressure, powder feed rate and distance from the nozzle, in order to evaluate if HVAF can be a valid technique for use in this application and to optimize the spraying recipe. The objectives were to get a sufficiently high thickness per sweep, to be able to make the depositions in a manageable number of sweeps, and to get low porosity, since the coatings need to be dense to be hard and possible to polish smooth. The tests showed that all three materials can be sprayed with the high settings on the parameters to obtain coatings that exceeded the set limits of the objectives. In the second part of this work, the recipe obtained from the first part was used to deposit samples for further analysis. The coatings were compared regarding cost, hardness, friction, wear and pick-up properties to evaluate if a switch in material from WC-Co was possible. The coatings showed both similarities and differences. The friction was very similar for the three materials. Cr3C2-NiCr was substantially cheaper than the other two, had lower hardness and higher porosity, but still probably acceptable values, and was satisfactory regarding wear and pick-up. WC-Co and WC-CrC-Ni were very similar to each other regarding cost, hardness and porosity but WC-Co was the best regarding wear and pick-up, where WC-CrC-Ni was the worst. The only clear advantage of WC-CrC-Ni over WC-Co is the lack of cobalt. Taking everything into consideration, including the fact that the wear and pick-up tests in this work was quite exaggerated, Cr3C2-NiCr is an interesting option for this application due to its low cost and acceptable test results, WC-Co had the best results but is expensive and contains cobalt and WC-CrC-Ni had as good results as WC-Co except for the wear and pick-up tests and does not contain cobalt.

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Sadeghimeresht, Esmaeil. "Corrosion Behavior of HVAF-Sprayed Bi-Layer Coatings". Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-9929.

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In a variety of engineering applications, components are subjected to corrosive environment. Protective coatings are essential to improve the functional performances and/or extend the lifetime of the components. Thermal sprayingas a cost-effective coating deposition technique offers high flexibility in coatings' chemistry/morphology/microstructure design. However, the inherent pores formed during spraying limit the use of coatings for corrosion protection. The recently developed supersonic spray method, High-Velocity-Air-Fuel (HVAF), brings significant advantages in terms of cost and coating properties. Although severely reduced, the pores are not completely eliminated even with the HVAF process. In view of the above gap to have a high quality coating, bi-layer coatings have been developed to improve the corrosion resistance of the coatings. In a bi-layer coating, an intermediate layer is deposited on the substrate before spraying the coating. The electrochemical behavior of each layer is important to ensure a good corrosion protection. The corrosion behavior of the layers strongly depends on coating composition and microstructure, which are affected by feedstock material and spraying process. Therefore, the objective of the researchis to explore the relationships between feedstock material, spraying process, microstructure and corrosion behavior of bi-layer coatings. A specific motivationis to understand the corrosion mechanisms of the intermediate layer which forms the basis for developing superior protective coatings. Cr3C2-NiCr top layer and intermediate layers (Fe-, Co- and Ni-based) were sprayed by different thermal spraying processes. Microstructure analysis, as well as various corrosion tests, e.g., electrochemical, salt spray and immersion tests were performed. The results showed a direct link between the corrosion potential (Ecorr) of the intermediate layer and the corrosion mechanisms. It was found that the higher corrosion resistance of Ni-based coatings than Fe- and Co-based coatings was due to higher Ecorr of the coating in the galvanic couple with top layers. Inter-lamellar boundaries and interconnected pores reduced the corrosion resistance of intermediate layers, however a sufficient reservoir of protective scale-forming elements (such as Cr or Al) improved the corrosion behavior.

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Części książek na temat "HVOF SPRAYED"

Senapati, Pragyan, Harekrushna Sutar, Rabiranjan Murmu i Shubham Gupta. "Slurry Erosion Behaviour of HVOF-Sprayed NiAl Composite Coating". W Lecture Notes in Mechanical Engineering, 623–29. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9057-0_68.

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Yadav, Pallvita, i Prashant Kumar Singh. "Slurry Erosion Behaviour of HVOF Sprayed Co-based Coatings". W Lecture Notes in Mechanical Engineering, 771–78. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-6945-4_58.

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Heydarzadeh Sohi, M., S. Khameneh Asl, Kazuyuki Hokamoto i M. Rezvani. "A DTA Study on HVOF Thermally Sprayed WC–M Coatings". W Explosion, Shock Wave and Hypervelocity Phenomena, 155–60. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-465-0.155.

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Jung, Jine Sung, Keun Bong Yoo, Eui Hyun Kim, Chae Hong Jeon i Do Hyang Kim. "The Thermal Cyclic Behavior of the VPS and HVOF-Sprayed MCrAlY Coatings". W Experimental Mechanics in Nano and Biotechnology, 1141–44. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1141.

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Sathishkumar, M., M. Vignesh, V. Sreenivasulu, M. Nageswara Rao, N. Arivazhagan i M. Manikandan. "Hot Corrosion Characteristics of HVOF-Sprayed Cr3C2-25NiCr Protective Coating on Ni-Based Superalloys". W Thermal Spray Coatings, 209–28. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003213185-8.

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Kunioshi, C. T., O. V. Correa i L. V. Ramanathan. "Erosion–Oxidation Behavior of HVOF Sprayed Ni20Cr, WC–20Cr7Ni and Cr3C2–Ni20Cr Coatings". W Surface Modification Technologies XVIII: Proceedings of the Eighteenth International Conference on Surface Modification Technologies Held in Dijon, France November 15-17, 2004: v. 18, 53–59. Wyd. 18. London: CRC Press, 2023. http://dx.doi.org/10.1201/9781003423874-9.

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Cabral-Miramontes, J. A., R. Rocha Reséndez, C. Gaona Tiburcio, P. Zambrano-Robledo, C. Poblano Salas i F. Almeraya Calderon. "Effects of Heat Treatments in Corrosion Behavior of HVOF-Sprayed Ni-Based Alloy Coatings". W Proceedings of the Symposium of Aeronautical and Aerospace Processes, Materials and Industrial Applications, 53–62. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65611-3_5.

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Kumar, Rajinder, Deepak Bhandari i Khushdeep Goyal. "A Review of the Mechanical Properties and Erosion Behavior of HVOF Sprayed Nanocomposite Coatings". W Lecture Notes in Mechanical Engineering, 277–87. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5371-1_24.

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Tyagi, Ankit, S. M. Pandey, R. S. Walia, Qasim Murtaza i Ajay Kumar. "Effect of Temperature on the Sliding Wear Behavior of HVOF Sprayed Al2O3 Composite Coating". W Advances in Materials and Mechanical Engineering, 23–28. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0673-1_3.

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Khameneh Asl, S., M. Heydarzadeh Sohi, Kazuyuki Hokamoto, Mitsuhiro Matsuda, Ryuichi Tomoshige i Minoru Nishida. "Study of Phase Transformations in Heat Treatment of HVOF Thermally Sprayed WC–17Co Coating". W Explosion, Shock Wave and Hypervelocity Phenomena, 161–66. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-465-0.161.

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Streszczenia konferencji na temat "HVOF SPRAYED"

Smith, M. F., R. C. Dykhuizen i R. A. Neiser. "Oxidation in HVOF-Sprayed Steel". W ITSC 1997, redaktor C. C. Berndt. ASM International, 1997. http://dx.doi.org/10.31399/asm.cp.itsc1997p0885.

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Abstract It is widely held that most of the oxidation in thermally sprayed coatings occurs on the surface of the droplet after it has flattened. The evidence in this paper suggests that, for the conditions studied here, oxidation of the top surface of flattened droplets is not the dominant oxidation mechanism. In this study, a mild steel wire (AISI 1025) was sprayed using a high-velocity oxy-fuel (HVOF) torch onto copper and aluminum substrates. Ion milling and Auger spectroscopy were used to examine the distribution of oxides within individual splats. Conventional metallographic analysis was also used to study oxide distributions within coatings that were sprayed under the same conditions. An analytical model for oxidation of the exposed surface of a splat is presented. Based on literature data, the model assumes that diffusion of iron through a solid FeO layer is the rate limiting factor in forming the oxide on the top surface of a splat. An FeO layer only a few thousandths of a micron thick is predicted to form on the splat surface as it cools. However, the experimental evidence shows that the oxide layers are typically 100x thicker than the predicted value. These thick, oxide layers are not always observed on the top surface of a splat. Indeed, in some instances the oxide layer is on the bottom, and the metal is on the top. The observed oxide distributions are more consistently explained if most of the oxide formed before the droplets impact the substrate.

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Turunen, E., T. Varis, S. P. Hannula, J. Keskinen, P. Lintunen i T. Fält. "Nanoreinforced HVOF-Sprayed Ceramic Coatings". W ITSC2005, redaktor E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0998.

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Abstract HVOF thermal spraying has been developed to deposit dense Al2O3-coatings with improved protective properties for various applications. Nanocrystalline coatings have been found to offer better thermal shock resistance, lower thermal conductivity and better wear resistance than their conventional counterparts. In this paper we describe the development of nanocrystalline Al2O3 and Al2O3-Ni -coatings, where the grain size of Al2O3 has been decreased and a few percents of nickel has been added in order to toughen the coating. Coatings were manufactured by HV- 2000 HVOF using spray parameters determined based on the on-line spray diagnostics. Parameters were selected aiming at different melting stages of the powder. The resulting microstructure of the coatings and its influence on the coating properties is discussed

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Jokinen, P. "HVOF-Sprayed Functionally Gradient Coating". W ITSC 1999, redaktorzy E. Lugscheider i P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0498.

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Abstract Thermally sprayed alumina coatings are widely used to improve wear resistance and heat insulation of steel and other metals. Usually these coatings have been made by plasma or flame spraying. HVOF-sprayed alumina coatings are more wear resistant and better bonded to the base material than with plasma and flame spraying. This paper presents a functionally gradient coating (FGC) of alumina and NiAl made with HVOF. It examines the microstructure, composition, hardness, adhesion, and resistance against thermal cycling of HVOF-sprayed FGC. The performance of FG-coating was proven with reference coatings made by plasma and flame spraying. Paper includes a German-language abstract.

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Jacobs, L., M. Hyland i Μ. De Bonte. "Wear Behaviour of HVOF and HVAF Sprayed WC-Cermet Coatings". W ITSC 1998, redaktor Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0169.

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Abstract The tribological behaviour of WC-Co-Cr coatings deposited by HVOF and HVAF and WC-Co coating deposited by HVAF was investigated in pin-on-disc tests. Wear rates were determined and wear tracks on the coatings and counterbodies were investigated in SEM. The HVAF sprayed coatings showed greater wear resistance compared to the HVOF coatings. The main wear mechanism in the WC-Co coatings was adhesive wear. The cobalt matrix is lubricious, resulting in very low wear rates and low debris generation. The main wear mechanisms in the WC-Co-Cr coatings were adhesive and abrasive wear. Adhesive wear results in pull-outs that are trapped in the contact zone and act as a third-body abrasive. Particle pull-out of the coating significantly increases the wear rate of the coated specimen. The HVAF WC-Co-Cr coatings proved to have a better resistance to particle pull-out which reflected in a considerably lower wear rate than the HVOF WC-Co-Cr coatings.

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Dizdar, Senad, i Manish Kumar. "Fe-Based Powder Alloys Deposited by HVOF and HVAF for Applications Exposed to Solid Particle Erosion". W ITSC2015, redaktorzy A. Agarwal, G. Bolelli, A. Concustell, Y. C. Lau, A. McDonald, F. L. Toma, E. Turunen i C. A. Widener. ASM International, 2015. http://dx.doi.org/10.31399/asm.cp.itsc2015p1013.

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Abstract HVOF and HVAF deposited coatings of three commercial Fe-based powder alloys have been ranked according to ASTM G76 solid particle erosion testing. The reference was electrolytic hard chrome (EHC) plating. The test results at 30 m/s abrasive particle velocity showed that 6AB powder alloy, when HVAF sprayed, Fe SP586 when both HVOF and HVAF sprayed meet the EHC plating reference erosion rate. 6AB HVOF sprayed and Fe SP529 both HVOF and HVAF sprayed powder alloys achieved two to three times higher erosion rate but were still at the same level of magnitude as the EHC plating reference.

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Khor, K. A., H. Li i P. Cheang. "HVOF Sprayed Hydroxyapatite/Titania Composite Coatings". W ITSC2001, redaktorzy Christopher C. Berndt, Khiam A. Khor i Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0245.

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Abstract As ceramic materials, the use of hydroxyapatite (HA) in clinical applications is severely limited by its intrinsic poor mechanical properties. The incorporation of some bioinert ceramics is believed to be a way to improve the mechanical reliability of HA matrix. HA coatings with titania addition were produced by using high velocity oxy-fuel (HVOF) spraying process in the present study. The mechanical properties of the as-sprayed coatings in terms of adhesive strength, shear strength and fracture toughness were investigated aiming to reveal the reinforcing effect of the titania addition in HA coatings. Qualitative phase analysis through X-ray diffraction (XRD) showed that mutual chemical reaction between TiO2 and HA occurred during coating formation, from which CaTiO3 was resulted. Totally unmelted titania powders were observed which suggests that the mutual reaction locates at HA/TiO2 splats' interface. Significant influence of coating microstructure on mechanical properties was revealed. As the content of titania in HA coatings reached 20vol%, the adhesive strength decreased largely. As the content of titania reached 30vol%, the further augmentation of the adhesive strength of is possibly resulted from the improved coating microstructure. The fracture toughness exhibited the values of 0.48 Mpa ⋅ m½ 0.60 Mpa ⋅ m½ and 0.67 Mpa ⋅ m½ for pure HA coating, 10vol% TiO2 blended HA coating and 20vol% TiO2 blended HA coating, respectively.

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Berger, L. M., R. Zieris i S. Saaro. "Oxidation of HVOF-Sprayed Hardmetal Coatings". W ITSC2005, redaktor E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0969.

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Abstract In the current study, the oxidation of hardmetal coatings (WC-12%Co, WC-17%Co, WC-10%Co4%Cr, WC-20%“CrC”-7%Ni, Cr3C2-25%NiCr, (Ti,Mo)(C,N)-29%Ni and (Ti,Mo)(C,N)-29%Co) in the temperature range 350- 900°C was studied for test durations ranging from 2 h to 128 h. The formation of oxide scales was investigated by X-ray diffraction, as well as by optical microscopy and SEM (including EDX) of coating cross sections. For coatings obtained by spraying with DJH 2700 and TopGun HVOF systems, the phase composition had only a moderate influence on high-temperature oxidation behavior in atmospheric conditions. The first oxides detectable by X-ray diffraction appeared on the coating surfaces after oxidation at 350°C for 128 h for all coatings. Pronounced oxidation (formation of oxide scales with thicknesses of greater than 10 µm) started at 600°C. Oxide scale growth differed significantly above this temperature among the hardmetal compositions studied here. WC-20%"CrC"-7%Ni and Cr3C2-NiCr had the highest oxidation resistance, with the oxide scale thicknesses lying below 10 ìm after oxidation at 800°C and 900°C for the two materials, respectively.

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Li, C. J., i Y. Y. Wang. "Bonding Mechanisms of HVOF Sprayed Coatings". W ITSC2002, redaktorzy C. C. Berndt i E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2002. http://dx.doi.org/10.31399/asm.cp.itsc2002p0965.

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Abstract This paper examines the bonding characteristics of HVOF sprayed layers. In order to determine the dominant adhesion mechanism, the coatings are applied to substrates of varying surface roughness with powder particles that are completely melted, in one case, and only partially melted, with solid and liquid phases, in another. The spray materials are NiCrBSi and WC-Co. The results of adhesion tests showed that the adhesion of the NiCrBSi layer on the roughened substrate was approximately 40 MPa, while there was no adhesion on the polished substrate. In contrast, the adhesion strength of the WC-Co layer on the polished substrate was between 20 and 40 MPa, and on the roughened substrate, it exceeded that of the binder materials. Paper includes a German-language abstract.

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Varis, T., K. Korpiola, P. Jokinen i P. Auerkari. "Tensile Testing of HVOF-Sprayed Coatings". W ITSC 1999, redaktorzy E. Lugscheider i P. A. Kammer. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 1999. http://dx.doi.org/10.31399/asm.cp.itsc1999p0389.

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Abstract In this paper, the Young's modulus, Poisson's ratio, and ultimate tensile strength of HVOF-sprayed NiCr (80/20) coating are evaluated by a uniaxial tensile test parallel to the coating plane. The effect of stand off distance is also considered. It is observed that, in the tensile test, the alloy NiCr (80/20) showed moduli of elasticity between 130 and 155 GPa and tensile strengths between 185 and 210 MPa. For the WC-CoCr alloy, the modulus of elasticity was between 185 and 210 MPa and the tensile strength was around 80 MPa. Paper includes a German-language abstract.

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Zha, Bailin, Hangong Wang i Xunjia Su. "Structure and Property of WC-17Co Coatings Sprayed by HVO/AF". W ITSC2003, redaktorzy Basil R. Marple i Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0837.

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Abstract The paper analyzed microstructure and property of WC-17Co coatings sprayed by High Velocity Oxygen/Air Fuel Spray under three kinds of spray conditions, which are HVOF, HVO-AF and HVAF. Coatings bond well with the substrate. The average bonding strength exceeds 70Mpa. Coatings are dense and hard, and the average porosity is about 1%. Microhardness of coatings is between HV10000.2 and HV12000.2. Coatings are mainly composed of WC with little W2C and Co3W3C. With the increasing of Nitrogen, decarburization of WC was reduced.

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Raporty organizacyjne na temat "HVOF SPRAYED"

Settles, G. S. Research On HVOF Thermal Sprays. Final Technical Report. Office of Scientific and Technical Information (OSTI), kwiecień 2003. http://dx.doi.org/10.2172/895627.

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Sartwell, Bruce D., i Keith O. Legg. Replacement of Chromium Electroplating on Landing Gear Components Using HVOF Thermal Spray Coatings. Fort Belvoir, VA: Defense Technical Information Center, maj 2004. http://dx.doi.org/10.21236/ada607046.

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Thirumalvalavan, Subramanian, i Natarajan Senthilkumar. Experimental Investigation and Optimization of HVOF Spray Parameters on Wear Resistance Behaviour of Ti‑6Al‑4V Alloy. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, maj 2019. http://dx.doi.org/10.7546/crabs.2019.05.15.

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Mondal, Kanchan, Rasit Koc i Chinbay Fan. HVOF Thermal Spray TiC/TiB₂ Coatings for AUSC Boiler/Turbine Components for Enhanced Corrosion Protection. Office of Scientific and Technical Information (OSTI), grudzień 2016. http://dx.doi.org/10.2172/1334673.

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Sartwell, Bruce D., i Keith O. Legg. A Replacement of Chromium Electroplating on C-2, E-2, P-3, and C-130 Propeller Hubs using HVOF Thermal Spray Coatings. Fort Belvoir, VA: Defense Technical Information Center, marzec 2004. http://dx.doi.org/10.21236/ada603749.

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