Academic literature on the topic 'Spray coatings'

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Journal articles on the topic "Spray coatings"

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Krishna, L. Rama, D. Sen, Y. Srinivasa Rao, G. V. Narasimha Rao, and G. Sundararajan. "Thermal spray coating of aluminum nitride utilizing the detonation spray technique." Journal of Materials Research 17, no. 10 (October 2002): 2514–23. http://dx.doi.org/10.1557/jmr.2002.0366.

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The main objective of this work is to examine the feasibility of depositing aluminum nitride (AlN) powders, synthesized using self-propagating high-temperature synthesis, on a mild steel substrate using the detonation spray coating technique. Thick coatings produced by utilizing the AlN powder were obtained at four different oxygen–acetylene ratios and analyzed for microstructure, microhardness, porosity, indentation fracture toughness, and phase distribution. The AlN powder particles were found to be undergoing oxidation during the deposition process. The interrelationship between the spray parameters and the extent of oxidation of AlN during the coating process was investigated. Tribological performance of the coatings was evaluated using a dry sand abrasion test and a pin-on-disc sliding wear test. The mechanical and tribological properties of the above four coatings were compared with pure alumina (Al2O3) coatings. The correlation between the structure of the coatings and their tribological performance was also established.
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Ctibor, Pavel, Micheala Kašparová, Jeremy Bellin, Emmanuel Le Guen, and František Zahálka. "Plasma Spraying and Characterization of Tungsten Carbide-Cobalt Coatings by the Water-Stabilized System WSP." Advances in Materials Science and Engineering 2009 (2009): 1–11. http://dx.doi.org/10.1155/2009/254848.

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Tungsten carbide-cobalt powders (WC-17wt% Co) were plasma sprayed by a water-stabilized system WSP. Experiments with variable feeding distances and spray distances were carried out. Thinner coatings were deposited on carbon steel substrates and thicker coatings on stainless steel substrates to compare different cooling conditions. Basic characterization of coatings was done by XRD, SEM, and light microscopy plus image analysis. Microhardness was measured on polished cross-sections. The main focus of investigation was resistance against wear in dry as well as wet conditions. The appropriate tests were performed with set-ups based on ASTM G65 and G75, respectively. The influence of spray parameters onto coating wear performance was observed. The results of mechanical tests were discussed in connection with changes of phase composition and with the quality of the coating's microstructure. The results show that for obtaining the best possible WC-17Co coating with WSP process, from the viewpoint of wear resistance, the desired parameters combination is long feeding distance combined with short spray distance.
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Yin, Shuo, Chaoyue Chen, Xinkun Suo, and Rocco Lupoi. "Cold-Sprayed Metal Coatings with Nanostructure." Advances in Materials Science and Engineering 2018 (2018): 1–19. http://dx.doi.org/10.1155/2018/2804576.

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Cold spray is a solid-state coating deposition technology developed in the 1980s. In comparison with conventional thermal spray processes, cold spray can retain the original properties of feedstock, prevent the adverse influence on the underlying substrate materials, and produce very thick coatings. Coatings with nanostructure offer the potential for significant improvements in physical and mechanical properties as compared with conventional non-nanostructured coatings. Cold spray has also demonstrated great capability to produce coatings with nanostructure. This paper is aimed at providing a comprehensive overview of cold-sprayed metal coatings with nanostructure. A brief introduction of the cold spray technology is provided first. The nanocrystallization phenomenon in the conventional cold-sprayed metal coatings is then addressed. Thereafter, focus is switched to the microstructure and properties of the cold-sprayed nanocrystalline metal coatings, and the cold-sprayed nanomaterial-reinforced metal matrix composite (MMC) coatings. At the end, summary and future perspectives of the cold spray technology in producing metal coatings with nanostructure are concluded.
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Deng, Chun Ming, Min Liu, Chang Guang Deng, Hong Liang Dai, and Ke Song Zhou. "Preparation and Characterizations of NiTi Intermetallic Coatings." Advanced Materials Research 291-294 (July 2011): 80–83. http://dx.doi.org/10.4028/www.scientific.net/amr.291-294.80.

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Much attention has been paid to NiTi intermetallic coating for enhancing cavitation erosion resistance property due to its shape memory effect. In this paper two processes were used to deposit NiTi intermetallic coatings. Process 1 was the deposition of NiTi intermetallic coating using warm spray process with NiTi intermetallic powder as feedstock, and solution treatment was subsequently performed. Process 2 was a mixture process of warm spray and laser treatment. Ni-Ti coating was first deposited via warm spray process with Ni-cladding Ti as feedstock, and laser-treatment was performed to realize the alloying of Ni-Ti. The microstructure and phase compositions for NiTi intermetallic coatings were characterized by means of SEM and XRD. The fundamental properties for NiTi intermetallic coatings were also analyzed.
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Dinh, Văn Chien, Tuan Hai Nguyen, and Khac Linh Nguyen. "Studying Adhesion between a 67Ni18Cr5Si4B Alloy Powder Coating Produced with the High Velocity Oxygen Fuel Thermal Spray Method HVOF and a Substrate Surface of a Worn C45 Steel Shaft." Key Engineering Materials 854 (July 2020): 117–25. http://dx.doi.org/10.4028/www.scientific.net/kem.854.117.

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Nowadays, thermal spray coatings are used to enhance mechanical properties of the material. One of the technologies used to produce thermal spray coating is HVOF spray technology. This is the most advanced and modern technology which has been widely used in the industry due to its flexibility and ability to create coatings with better adhesion in comparison with other thermal spray methods. This article presents some empirical findings from applying the 67Ni18Cr5Si4B alloy powder coating onto C 45 steel shaft by HVOF spray technology. It also analyzes the influence of some technological parameters on the adhesion of the coating. As a result, the parameters of HVOF spray technology are obtained suitable for recovering worn axis-sized workpieces.
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Ni, Weiliang, Peng Li, Yajun Zhu, Zhigang Di, Liangliang Guo, and Yunqi Liu. "Comparative Study of Anti-Corrosion Properties and Lifespan Prediction Model for Inorganic Zinc-Rich Coating and Thermal-Spray Zinc Coating." Coatings 12, no. 4 (April 8, 2022): 505. http://dx.doi.org/10.3390/coatings12040505.

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On the basis of guaranteeing the reliability of the coating, thermal-spray zinc coating has been verified by the industry to have a lifespan of more than 20 years. It is an anti-corrosion coating with excellent performance. Inorganic zinc-rich coating being a new coating technology has a certain degree of influence on its popularization and application in the field of anti-corrosion; this is due to the lack of relevant comparison data on its anti-corrosion performance and service life. It is necessary to compare and analyze the service life and corrosion resistance of the two coatings, so as to obtain the best application scenarios for the two coatings and provide a reference for the selection of the most economical coating. Based on coating reliability, 7500 h of accelerated salt-spray tests of inorganic zinc-rich coating and of the thermal-spray coating of steel structures were carried out. Electrochemical and salt-spray tests on inorganic zinc-rich coating and thermal-spray zinc coating were carried out. The micro-corrosion morphology, corrosion rate and corrosion mechanism of the two coatings and the factors affecting the corrosion rate were obtained. An interfacial corrosion-thinning and weight-loss equation was established to predict the service life of inorganic zinc-rich coating by comparing it with that of the thermal-spray zinc coating salt-spray test; they suggested that inorganic zinc-rich coating has a longer service life. The results are of practical guiding significance for the selection of a zinc coating and the rapid selection and design of a supporting scheme, and can also provide a reference for the service-life prediction of other types of coatings.
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Naidu, S. V., Carlos Green, Christopher Maxie, James D. Garber, and Gary A. Glass. "Surface Analysis of Shear Strength Tested Tungsten Carbide Thermal Spray Coatings+." Microscopy and Microanalysis 3, S2 (August 1997): 791–92. http://dx.doi.org/10.1017/s1431927600010849.

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Thermal spray processing has become an important powder-consolidation technique to yield new materials for extremes of temperature, radiation, wear, corrosion and mechanical stresses. High Velocity Oxy-Fuel (HVOF) spray coating process gives higher deposition densities and coating hardness; lower oxide content and porosity. The adhesive strength of thermal spray coatings is greatly effected by the interfacial impurities. The ring shear test method shown in Fig. 1 appears to give the most accurate results on shear adhesive strength. A typical ring shear test result of 88WC12Co 1/4" ring HVOF thermal spray coating on 4140 steel rod using a Jet kote thermal spray gun is shown in Fig. 2. Repeated ring shear tests on similar samples prepared under same spray and test conditions resulted in different shear bond strength and coating ring displacement before break off. We examined the ring shear tested coatings using a Zeiss DMS942 Scanning Electron Microscope (SEM) and Kevex Energy Dispersive X-ray Spectrometer (EDXS) with LPX1 Quantum Si(Li) Detector.
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Faisal, N. H., R. Ahmed, A. K. Prathuru, A. Paradowska, and T. L. Lee. "Measuring Residual Strain and Stress in Thermal Spray Coatings Using Neutron Diffractometers." Experimental Mechanics 62, no. 3 (November 10, 2021): 369–92. http://dx.doi.org/10.1007/s11340-021-00803-9.

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Abstract Background During thermal spray coating, residual strain is formed within the coating and substrates due to thermo-mechanical processes and microstructural phase changes. Objective This paper provides a comprehensive guide to researchers planning to use neutron diffraction technique for thermal spray coatings, and reviews some of these studies. Methods ENGIN-X at the ISIS spallation source is a neutron diffractometer (time-of-flight) dedicated to materials science and engineering with high resolution testing. The focus is on the procedure of using ENGIN-X diffractometer for thermal spray coatings with a view that it can potentially be translated to other diffractometers. Results Number of studies involving neutron diffraction analysis in thermal spray coatings remain limited, partly due to limited number of such strain measurement facilities globally, and partly due to difficulty is applying neutron diffraction analysis to measure residual strain in the thermal spray coating microstructure. Conclusions This technique can provide a non-destructive through-thickness residual strain analysis in thermally sprayed components with a level of detail not normally achievable by other techniques. Neutron sources have been used to measure strains in thermal spray coatings, and here, we present examples where such coatings have been characterised at various neutron sources worldwide, to study residual strains and microstructures. Graphic Abstract
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Gulizia, Stefan, A. Trentin, S. Vezzù, Silvano Rech, Peter King, Mahnaz Z. Jahedi, and Mario Guagliano. "Characterisation of Cold Spray Titanium Coatings." Materials Science Forum 654-656 (June 2010): 898–901. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.898.

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Cold spray is a solid state spray deposition process utilizing a supersonic De Laval nozzle to accelerate fine particles to high velocities. Particles plastically deform on impact to the substrate and to each other to create dense well adhered structures. In this study, the microstructure and mechanical properties of cold spray Titanium coatings deposited using nitrogen gas at different gas temperature and pressure were examined. In general, it was found that gas-atomised CP-titanium powder is capable of producing dense coating structures on aluminium alloy (Al6061) substrates. The micro-hardness, oxygen and nitrogen content of the coatings were found to be slightly higher than powder in the as-received condition. It was also found the coating residual stress was purely compressive when cold spray is conducted at high gas pressure and temperature.
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Bartuli, C., T. Valente, F. Casadei, and M. Tului. "Advanced thermal spray coatings for tribological applications." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 221, no. 3 (July 1, 2007): 175–85. http://dx.doi.org/10.1243/14644207jmda135.

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Thermal spray coating is one of the most common procedures to improve the tribological properties of materials. Ceramic and cermet coatings, especially those based on oxides (alumina, chromium oxide, etc.) and carbides, are widely used for wear protection. Improvements under investigations are related to the possible use of nanostructured coatings and to the potential application of hybrid techniques. As a possible alternative, solid lubrication is proposed as integration or replacement of the traditional liquid lubrication in the case of severe operative conditions when there is the possibility of a lack of lubricant or when environmental problems can arise from waste disposal. In the present paper, results from experimental activities on different types of abrasion-resistant thermal spray coatings are presented: graded coating systems, specifically designed for titanium-based alloys, obtained by reactive plasma spraying and physical vapour deposition of titanium nitrides; nanostructured WC-Co coatings deposited by high velocity oxy-fuel; plasma-sprayed ceramic coatings based on oxides containing nanophases either from nanostructured precursors or postprecipitated by purposely designed thermal treatments; self-lubricant coatings deposited by plasma spray with the inclusion of graphite.
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Dissertations / Theses on the topic "Spray coatings"

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Popa, Gabriela. "Spray-on hybrid nanoscale coatings." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/POPA_Gabriela_2010.pdf.

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Des couches minces hybrides ont été préparé par une version modifiée de la méthode classique de déposition « couches-par-couches ». Les couches inorganiques de ces films hybrides sont déposés en utilisant la méthode de pulvérisation consécutive (qui est la méthode modifiée) pour laquelle la pulvérisation de solutions aqueuses se fait de manière alterné avec des temps de pulvérisation très courts (moins de 5 secondes). Nombreuses couches inorganique sont obtenues par cette technique telles que des couches de phosphate de calcium, oxalate de calcium, fluorure de calcium, Blue de Prusse, chlorure d’argent, etc. L’application principale des couches hybrides contenant de phosphate de calcium et Collagène est la fabrication de nouveaux biomatériaux pour la régénération/réparation du cartilage articulaire (le domaine d’ingénierie tissulaire). La structure de type « sandwich » de ces components permet la mimique du cartilage articulaire naturel. Pour la préparation de ces couches hybrides on a utilisé un film mince de polyélectrolytes de (PAHPSS). Le dépôt de couche mince inorganique peut se faire aussi en utilisant la méthode de pulvérisation simultanée des deux solutions contenant les cations et les anions. Des couches minces homogènes sur des surfaces d’ordre des cm2 ont été obtenues et pour lesquelles l’épaisseur peut être contrôlée par la variation de paramètres de pulvérisation tels que le temps de pulvérisation, la concentration de la solution, la nature du substrat
Hybrid thin films were prepared by a modified variant of the classical Layer-by-Layer (LbL) deposition method. Inorganic coatings are deposited using the consecutive spray method, in which aqueous solutions are alternatingly sprayed for short times (less than 5 seconds). Numerous inorganic coatings were prepared this way such as calcium phosphate, calcium fluoride, calcium oxalate, silver chloride, Prussian Blue. The main target of the hybrid films comprised of calcium phosphate and Collagen is for application in the cartilage repair. “Sandwich”-like structures of these components mimic the natural articular cartilage structure. In order to obtain the hybrid film containing Collagen and calcium phosphate, we used a (PAHPSS)barrier film. The deposition of inorganic coating can also be realized using the simultaneous spraying method where both solutions (cationic and anionic solution) are sprayed simultaneously. Homogeneous on several cm2 of surface thin films are obtained in which the film thickness is controlled by spray parameters such as spraying time, solution concentration, nature of substrate to be coated
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Bao, Yuqing. "Plasma spray deposition of polymer coatings." Thesis, Brunel University, 1995. http://bura.brunel.ac.uk/handle/2438/5152.

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This work investigates the feasibility of the use of plasma spray deposition as a method of producing high performance polymer coatings. The work concentrates on the understanding of the processing of the plasma spraying of polymers, the behaviour of polymeric materials during deposition, and the study of process-structure-properties relationships. Processing modelling for the three stages of the evolution of a polymer deposit (droplet-splat-coating) has been carried out using heat transfer theory. A theoretical model is proposed which consists of three parts: the first part predicts the temperature profile of in-flight particles within plasma jet, the second part predicts the cooling of isolated splats impacting on a substrate and the third part, the heat transfer through the coating thickness. The heat transfer analysis predicts that the development of large temperature gradients within the particle is a general characteristics of polymers during plasma spraying. This causes difficulties for polymer particles to be effectively molten within the plasma jet without decomposition. The theoretical calculations have predicted the effect of processing parameters on the temperature, the degree of melting and decomposition of in-flight polymer particles. With the aid of the model, the conditions for the preparation of high integrity thermoplastic deposits have been established by the control of the plasma arc power, plasma spraying distance, feedstock powder injection, torch traverse speed and feedstock particle size. The optimal deposition conditions are designed to produce effective particle melting in the plasma, extensive flow on impact, and minimal thermal degradation. The experimental work on optimizing processing parameters has confirmed the theoretical predictions. Examination of polymer coating structures reveals that the major defects are unmelted particles, cracks and pores. Five major categories of pores have been classified. It also revealed a significant loss in crystallinity and the presence of a minor metastable phase in the plasma deposited polyamide coatings due to rapid solidification. The study has indicated that the molecular weight of a polymer plays an important role on the splat flow and coating structure. Under non-optimal deposition condition, substantial thermal degradation occurred for which a chain scission mechanism is proposed for plasma deposited polyamide coatings. There are difficulties in achieving cross-linking during plasma spray deposition of thermosets. The theoretical calculations predict that adequate cross-linking is unlikely in a coating deposited under normal conditions, but preheating the substrate to above the cross-linking temperature improves the degree of cross-linking of the coatings substantially. In addition, the coating thickness has a major effect on the degree of cross-linking of thermosets. The calculations also predict that lowering the thermal conductivity by applying a thermal barrier undercoat and using a faster curing agent to reduce time required for the cross-linking reaction can improve the degree of cross-linking of thermoset deposits. The experimental results for the degree of cross-linking and wear resistance confirmed these predictions.
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Diccar, Unmesh Vilas Ahmed Ikramuddin. "Plasma spray coatings for polymer composites." Diss., A link to full text of this thesis in SOAR, 2006. http://soar.wichita.edu/dspace/handle/10057/643.

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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.
"December 2006." Title from PDF title page (viewed on Oct. 29, 2007). Thesis adviser: Ikramuddin Ahmed. Includes bibliographic references (leaves 68-71).
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Rech, S., A. Surpi, S. Vezzu, A. Patelli, A. Trentin, J. Glor, Jenny Frodelius, Lars Hultman, and Per Eklund. "Cold-spray deposition of Ti2AlC coatings." Linköpings universitet, Tunnfilmsfysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-92686.

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Ti2AlC coatings have been fabricated by cold-spray deposition. The microstructure evolution as a function of basic spray parameters temperature and pressure onto AA6060 aluminium alloy and 1.0037 steel substrates has been studied. Adherent and dense 50–80 μm thick Ti2AlC coatings were deposited on soft AA6060 substrates under gas temperature and pressure of 600 °C and 3.4 MPa, respectively, whilst comparable results were obtained on harder 1.0037 steel by using higher temperature (800 °C) and pressure (3.9 MPa).
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Ahmed, Rehan. "Rolling contact fatigue of thermal spray coatings." Thesis, Brunel University, 1998. http://bura.brunel.ac.uk/handle/2438/5469.

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The practical advantages of thermal spray coatings like high deposition rates, low cost and tribological properties of high wear resistance have enabled these coatings to become an integral part of aircraft and automobile industry. Recent advancements in thermal spraying techniques like high particle speed and temperature call for new applications for these coatings. This experimental study addresses the Rolling Contact Fatigue performance of thermal spray coatings deposited by a variety of techniques like High Velocity Oxy-Fuel (HVOF), Detonation Gun (D-Gun) and Plasma spraying. RCF tests were conducted using a modified four ball machine in conventional steel ball bearing and hybrid ceramic bearing configurations. Tribological conditions during the RCF tests were varied by changing the test lubricant and the lubrication mechanism, contact load and shape of the drive coated rolling element to vary the roll/slip ratio. RCF tests were analyzed on the basis of the performance, coating failures using surface and subsurface observations, and residual stress studies. Experimental and theoretical studies of the ball kinematics have also been included. These tests revealed that the performance of the coated rolling elements was dependent upon the coating and the substrate properties. The coating thickness, substrate hardness, tribological conditions during the test, coating and substrate material as well as the coating process and the substrate preparation significantly affect the coating performance and the failure modes. Three different failure modes of these coatings have been discussed along with the changes in the near surface residual stress behaviour of the coated rolling elements.
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Clark, Aaron W. "Gloss Development of Spray-coated Systems." Fogler Library, University of Maine, 2004. http://www.library.umaine.edu/theses/pdf/ClarkAW2004.pdf.

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Martín, Vilardell Anna. "Functionalized coatings by Cold Spray for joint prosthesis." Doctoral thesis, Universitat de Barcelona, 2017. http://hdl.handle.net/10803/400484.

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The Cold Spray (CS) is a novelty technique for the production of coatings within the field of Thermal Spray. The use of low work temperatures (under the melting point of the material) is what makes it different from the other conventional spraying techniques. CS is an ideal technique to spray materials that are sensitive to temperature, such as nanostructured and amorphous materials, or sensitive to the oxygen, as could be titanium. These characteristics may be specially promising within the field of biomedical coatings. Compared to the conventional processes, it would allow to produce coatings in a more cost-effect and environmental friendly way. The research is mostly focused on the obtaining of highly rough Commercial Pure Titanium (CP-Ti) and Calcium Phosphate (CP) coatings by CS for joint prosthesis application. An exhaustive development of coating parameter optimization has been developed and the different deposition mechanisms for each feedstock powder were analyzed as well. The mechanical and biological properties of the optimal coatings were evaluated consequently. The mechanical testing (e.g. Tensile and shear strength test and Taber test), was performed on the optimized CP-Ti coating overcoming the ASTM standard specifications for joint, shoulder and knee prosthesis; CP-Ti coating showed good bonding between particles as well with the substrate. The used of coarse titanium particles provided high roughness (Ra=40±12 µm and Rz=235±44 µm) that shows an increase in cell viability, proliferation and differentiation as well as mineralization, in comparison with a low-roughness titanium surface obtained by Sand Blasted (SB).Afterwards, additional surface modification procedures were investigated to obtain nanotextured surfaces on the as-sprayed CS titanium coatings to evaluate their in-vitro response for comparison. The anodic oxidation treatment leads to a TiO2 Nanotube (NT) layer with a pore diameter between 50-100 nm and a roughness of Ra=36.8±4.6 nm, whereas the alkaline treatment leads to a nanosurface of Ra=1.2±0.2nm, composed by very fine porosity <100nm. The nanotextured treatments lead to an increase of cell viability in comparison with the as-sprayed CP-Ti coating as well as high cell differentiation due to its nanofeatures. On the other hand, Hydroxyapatite (HA) coatings were well-deposited by CS without amorphization. Two different HA powders were used as feedstock, a sintered HA powder with a crystalline microstructure, and agglomerate HA feedstock powder with a nanocrystalline microstructure. Both powders show different deposition by CS according to their microstructure; particle deposition of sintered HA powder occurred by slight void collapse and dynamic fragmentation followed by cracking and crushing and reduction in crystal size by plastic deformation mechanisms, whereas agglomerate HA powder a consolidation between particles is caused by the tamping effect produced by the continuous impact of incoming particles onto the already adhered ones, leading to coating build up. Although sintered HA coatings show high cell differentiation, agglomerated HA coatings result in higher cell viability and proliferation, as well as a more homogeneous cell deposition along the coating; agglomerate HA coatings were compared to HA coatings obtained by conventional techniques (e.g. Plasma Spray), and an increase of cell viability and proliferation were observed according to the crystalline HA percentage (CS>PS). To sum up, CS has shown to be suitable to produce metallic and ceramic coatings for joint applications, especially those dealing with materials that are sensitive to the temperature and oxygen. The non-microstructural changes from the feedstock powder to the coatings leads to a big advantage in CS to obtain customized coatings.
La Proyección Fría o también conocida por el nombre de Cold Spray (CS), es una técnica muy novedosa para la obtención de recubrimientos en el ámbito de la proyección térmica. El uso de bajas temperaturas de trabajo (siempre por debajo del punto de fusión del material) es lo que la hace diferente respecto al resto de técnicas convencionales, ya que la hace ideal para depositar materiales sensibles a la temperatura (ej. Materiales nanoestructurados y amorfos) o reactivos al oxígeno (ej. Titanio). Además tiene un gran potencial a nivel económico y ambiental por ser un proceso eficiente y respetuoso con el medio ambiente. La investigación se basa principalmente en la obtención de recubrimientos de titanio rugoso y fosfato cálcico mediante proyección fría, donde se han estudiado los diferentes mecanismos de deposición de las materias primas y se ha elaborado un estudio a nivel mecánico y biológico. Además, se han realizado tratamientos adicionales sobre los recubrimientos de titanio para obtener superficies nanotexturizadas y poderlas comparar in vitro. El uso de partículas gruesas de titanio facilita la obtención de grandes rugosidades superficiales en los recubrimientos de titanio, mejorando así la viabilidad y proliferación celular, al igual que la diferenciación y mineralización celular, en comparación a superficies con bajas rugosidades (como las superficies de titanio granalladas). Aun así, los tratamientos de nanotexturización, tales como el anodizado (donde se obtuvieron nanotubos de TiO2 con un diámetro entre 50-100nm) y el tratamiento alcalino (en el cual se obtuvieron porosidades <100nm), promovieron aún más la respuesta celular de los recubrimientos de titanio en los aspectos previamente mencionados. Por otra parte, los recubrimientos de hidroxiapatita (HA), se depositaron por CS sin ninguna amorfización. También se observó que el proceso de obtención de la HA influía en la deposición de la partícula. La deposición de una HA sinterizada ocurre mediante el colapso de poros y fragmentación dinámica de la partícula, reduciendo así el tamaño de cristal por mecanismos de deformación plástica. Por el otro lado, el polvo de HA obtenido mediante aglomeración, se deposita mediante la compactación y consolidación entre partículas, pudiendo hacer crecer la capa. In vitro, la HA sinterizada da una mayor diferenciación celular, mientras que la HA aglomerada da una mayor viabilidad y proliferación celular. Los recubrimientos de HA aglomerada fueron comparados con los que actualmente se producen por proyección de plasma, y se observó una mejor respuesta celular en los recubrimientos obtenidos por CS debido a que no ofrece cambios microestructurales en el polvo de partida. Para resumir, el CS es una técnica idónea para la producción de recubrimientos metálicos y cerámicos para prótesis articulares, especialmente con materiales sensibles a la temperatura y al oxígeno. Al no producirse un cambio microestructural en el recubrimiento durante el proceso de su obtención, permite la elaboración de recubrimientos personalizados.
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Vyawahare, Siddharth M. Ahmed Ikram. "Protective thermal spray coatings for polymer matrix composites." Diss., A link to full text of this thesis in SOAR, 2006. http://soar.wichita.edu/dspace/handle/10057/684.

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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering.
"December 2006." Title from PDF title page (viewed on Sept. 18, 2007). Thesis adviser: Ikram Ahmed. Includes bibliographic references (leaves 79-81).
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Liu, Junling. "Plasma spray deposition of silicon nitride composite coatings." Thesis, London South Bank University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288111.

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Marrocco, Tiziana. "Development of improved cold spray and HVOF deposited coatings." Thesis, University of Nottingham, 2008. http://eprints.nottingham.ac.uk/11453/.

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The overall aim of this research project was to expand the understanding of the deposition of titanium and the nickel-based superalloy Inconel 718 by spray deposition methods. The spray processes employed were cold spraying and high velocity oxy-fuel (HVOF) thermal spraying. The first part of the work was undertaken to expand the understanding of the deposition of titanium by cold spraying; the HVOF process is unsuitable for Ti because of the metal's high reactivity. The deposits were produced from commercially pure titanium using cold spray equipment designed in the University. Using helium gas, the effects of different powder particle size ranges, types of substrate, substrate preparation methods, and spray parameter conditions on deposit formation were investigated. Using a simple one-dimensional model of compressible gas flow and particle acceleration, particle velocity distributions were calculated to aid interpretation of experimental data. Results show that titanium can be successfully cold sprayed onto substrates of Ti6AI4V and mild steel, with the critical velocity for deposition of this powder type of approximately 690 m s-1. The level of porosity was generally in the range of 13-23% and the adhesive bond strength was dependent on surface preparation but independent of gas pressure with values ranging from 22 MPa to 10 MPa for ground and grit blasted substrates respectively. This compares with a value of around 80 MPa which is typical for well adhered HVOF sprayed coatings. The second part of the study was concerned with comparing the deposition of Inconel 718 by cold spraying and HVOF thermal spraying; the latter employed a JP5000 liquid fuel gun. A Tecnar DPV-2000 instrument was used to systematically investigate the effect of changes in spray parameters (spraying stand-off distance, oxygen/fuel ratio, total mass flow rate, combustion pressure), on particle velocity and temperature during HVOF spraying. It was found that generally the particle velocity was more strongly affected by the stand-off distance and combustion pressure of the spraying gun whereas the particle temperature was mostly influenced by the particle size and combustion pressure. The microstructures of coatings sprayed under 4 different well controlled conditions were investigated and changes in the morphology of splats and partially melted particles in the coating were related to the particle temperature and velocity at impact. The HVOF had high bond strength and low oxygen level of typically 0.45 wt% (corresponding to an oxide content of less than 1.6 wt.%). By contrast, in the cold sprayed coatings, the bonding was considerably low (-14 MPa), independently from the process conditions. It was found that the process parameter that mainly affected the properties of the cold sprayed deposits was the gas pressure. More specifically, the microhardness of the coatings increased with the pressure whereas the relative porosity decreased.
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Books on the topic "Spray coatings"

1

Thakur, Lalit, and Hitesh Vasudev. Thermal Spray Coatings. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003213185.

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Cavaliere, Pasquale, ed. Cold-Spray Coatings. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67183-3.

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Heimann, R. B. Plasma-spray coatings: Principles and applications. Weinheim: VCH, 1996.

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Heimann, R. B. Plasma spray coating: Principles and applications. 2nd ed. Weinheim: Wiley-VCH, 2008.

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Pawłowski, Lech. The science and engineering of thermal spray coatings. 2nd ed. Chichester, England: Wiley, 2008.

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Pawłowski, Lech. The science and engineering of thermal spray coatings. 2nd ed. Chichester, England: Wiley, 2008.

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The science and engineering of thermal spray coatings. Chichester: Wiley, 1995.

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Hämäläinen, Markku. Spray coating technique as a surface treatment for woodcontaining paper grades. [Lappeenrantaensis]: Lappeenrannan teknillinen korkeakoulu, 2002.

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Bahrami, Arash. Evaluation of thermal spray coatings with peel adhesion test "PAT". Ottawa: National Library of Canada, 2000.

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Materials Technology Institute of the Chemical Process Industries (U.S.), ed. Thermal spray coating applications in the chemical process industries. Houston, TX: Published for the Materials Technology Institute of the Chemical Process Industries, Inc. by NACE International, 1993.

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Book chapters on the topic "Spray coatings"

1

Champagne, Victor K., Victor K. Champagne, and Christian Widener. "Cold Spray Applications." In Cold-Spray Coatings, 25–56. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_2.

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Swain, Biswajit, S. S. Mohapatra, and A. Behera. "Plasma Spray Coating." In Thermal Spray Coatings, 317–30. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003213185-13.

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AlMangour, Bandar. "Fundamentals of Cold Spray Processing: Evolution and Future Perspectives." In Cold-Spray Coatings, 3–24. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_1.

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Yu, Min, and Wenya Li. "Metal Matrix Composite Coatings by Cold Spray." In Cold-Spray Coatings, 297–318. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_10.

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Chromik, Richard R., Sima Ahmad Alidokht, J. Michael Shockley, and Yinyin Zhang. "Tribological Coatings Prepared by Cold Spray." In Cold-Spray Coatings, 321–48. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_11.

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Bala, Niraj, and Harpreet Singh. "Fundamentals of Corrosion Mechanisms in Cold Spray Coatings." In Cold-Spray Coatings, 351–71. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_12.

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Koivuluoto, Heli. "Corrosion Resistance of Cold-Sprayed Coatings." In Cold-Spray Coatings, 373–92. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_13.

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Kong, Lingyan. "High Temperature Oxidation Performance of Cold Spray Coatings." In Cold-Spray Coatings, 393–418. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_14.

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MacDonald, Daniel, Aleksandra Nastic, and Bertrand Jodoin. "Understanding Adhesion." In Cold-Spray Coatings, 421–50. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_15.

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Luzin, Vladimir, Kevin Spencer, Mingxing Zhang, Neil Matthews, Joel Davis, and Michael Saleh. "Residual Stresses in Cold Spray Coatings." In Cold-Spray Coatings, 451–80. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67183-3_16.

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Conference papers on the topic "Spray coatings"

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Shao, T. M., D. J. Xu, J. G. Luo, and C. J. Wu. "Impact Evaluation of Plasma Spray Coatings." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0641.

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Abstract Impact performance of plasma spray coatings is usually evaluated by means of surface observation after impact action. As a matter of fact, the dynamic response characteristics of coatings in the course of impact action are also very important. In this paper, a method of response frequency spectrum analysis is developed for the impact evaluation of plasma spray coatings. An impact test machine, in which the impact load is generated by a pivot-rod-lever system, is specially designed, allowing both single impact test and repeated impact test. The frequency spectra of Cr2O3 ceramic coating and WC-Co17% alloy coating under single and repeated impact action are analyzed. The results show that there is an obvious relationship between the impact performance and the impact response frequency spectrum. Abrupt changes in the coating, such as appearance of surface cracks and surface damage, correspond the sudden changes of the response frequency spectrum.
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Tucker, R. C., and A. A. Ashari. "The Structure Property Relationship of Erosion Resistant Thermal Spray Coatings." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p0259.

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Abstract Thermal spray coatings are widely used for erosion resistance, but the relationship between the microstructure of the coatings and their erosion resistance is not well understood. In this paper the performance of several commonly used coatings at ambient and elevated temperatures is reviewed in light of the coatings' structure and compared with a new coating. Two high temperature industrial applications, solid particle erosion in steam turbines and alumina-based erosion have been chosen to illustrate the significance of a coating's structure on its performance.
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Shmyreva, T., J. Knapp, and V. Sedov. "Nano- and Microcrystalline Cold Spray Coatings." In ITSC2005, edited by E. Lugscheider. Verlag für Schweißen und verwandte Verfahren DVS-Verlag GmbH, 2005. http://dx.doi.org/10.31399/asm.cp.itsc2005p0192.

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Abstract The Cold Spray coatings have been sprayed from binary eutectic alloy – Al-12%Si and from the complex composition iron-based alloy. The atomized Al-Si powder had close to microcrystalline (grain size around 1micron) structure, the Fe alloy powder had amorphous-nanocrystalline structure. Aluminum-based alloy was also sprayed with addition of up to 10% of aluminum oxide powder. The coating structure and properties have been investigated using optical microscopy, scanning electron microscopy, energy dispersive spectrometry, X-ray diffraction, microcalorimetry, microhadness, tensile, bend, erosion and abrasion tests, and corrosion polarization tests. It has been shown that the Al-Si coatings have microcrystalline structure, and the Fe-based coating have amorphous-nanocrystalline structure similar but not identical to the feedstock powders. Cold Spray process has a specific mechanism to preserve the powders metastable structures. The coatings have enhanced hardness, wear and corrosion resistance. Abstract only; no full-text paper available.
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Richer, P., B. Jodoin, E. Sansoucy, L. Ajdelsztajn, and G. E. Kim. "Properties of Cold Spray Nickel Based Coatings." In ITSC2006, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, R. S. Lima, and J. Voyer. ASM International, 2006. http://dx.doi.org/10.31399/asm.cp.itsc2006p0227.

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Abstract Nickel based alloys used in coating applications have been the focus of many studies, particularly in the aerospace industry. Their inherent corrosion and oxidation resistant properties have made them especially attractive for use as the metallic bond coat found in thermal barrier coating systems. Cold Spray is an emerging coating technology in which fine powder particles are accelerated in a supersonic flow and then deposited onto a substrate by means of plastic deformation. In this study, conventional CoNiCrAlY coatings and nanocrystalline nickel coatings are produced using the Cold Spray deposition technique. The coating quality is evaluated using scanning electron microscopy as well as porosity and microhardness measurements.
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Unger, R. H., V. E. Belashchenko, W. R. Kratochvil, J. P. Dunkerley, V. Sedov, and E. A. Smith. "A New Arc Spray System to Spray High Density, Low Oxide Coatings." In ITSC 1998, edited by Christian Coddet. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.itsc1998p1489.

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Abstract A new arc spray system has been designed which produces coatings with very high density and low oxide content. Advantages of the new process are illustrated by a comparison of coating properties sprayed by a conventional arc process and the new system for various metals.
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Cheney, J., and G. Kusinski. "Performance of Corrosion Resistant Arc Spray Coatings as a Function of Spray Parameters." In ITSC 2012, edited by R. S. Lima, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, A. McDonald, and F. L. Toma. ASM International, 2012. http://dx.doi.org/10.31399/asm.cp.itsc2012p0550.

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Abstract Twin wire arc spray (TWAS) coatings were produced under varying spray conditions (spray angle, traverse rate, and spray distance) to simulate on-site hand spraying operations typically used to coat existing refinery vessels. Two materials, Alloy C276 (commonly used for corrosion protection of refinery vessels) and the newly developed Nicko-Shield 200 chemistry (designed to reduce porosity and oxide content under arc spray conditions) were compared in the testing. Alloy C276 coatings showed good coating performance (&gt;40 MPa adhesion) when sprayed under ideal conditions, but showed a sharp drop off in coating integrity (&lt;20 MPa adhesion) when sprayed at lower traverse rates, sharper angles, and closer spray distances. Deviating from non-ideal conditions resulted in increased porosity and oxide content leading to increased permeability. It was concluded that non-ideal conditions, which intermittently occur in hand spraying operations on large surface areas, can lead to coating patches with unacceptably low adhesion, potential spalling, and high permeability when spraying Alloy C276. Patches of low coating quality require additional maintenance or result in coating failure, creating a lack of confidence in thermal spray technology as a protective solution in the industry. This study shows the results of an effort to develop an alloy solution which is more reliable in spraying large surface areas by hand for corrosion protection. The developed Ni-based material showed improved adhesion (70+ MPa) and greatly reduced permeability (as measured by ferroxyl exposure). This performance was stable across the wide range of spray conditions used in this study. This suggests that alloy design can be used to increase the reliability for twin wire arc spray coatings, and enable confidence for expanded use in this industry.
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Dekhtyar, L., A. Kleyman, S. Berman, and V. Andreychuk. "Elasticity Characteristics of Plasma Spray Coatings." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0813.

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Abstract Future development of thermal spray processes and new composite materials raises an important problem concerning the transition from qualitative to quantitative methods of coatings evaluation. It is well known that thermal spray coating deposition in most cases is accompanied by the formation of temporal and residual stresses through the coating thickness. For proper evaluation of formed stressed state it is extremely important to know the real value of elastic characteristics in different layers of the coating. This problem has become more complicated taking into consideration the variety of materials, different spray parameters, number of coating layers and extreme service conditions. These values can be obtained only from experimentation. Elastic characteristics (EC) could be used in many calculations, such as durability, stiffness, fatigue, vibration and others. This paper describes new methods of experimental determination of elastic characteristics presumed as variable throughout the coating thickness. Influence of coating composition, particle size of initial powders, spray parameters, post-treatment and other factors on elastic modulusses were studied. Obtained experimental data for different materials supplement existing data and can be used for evaluation of residual stresses and other purposes.
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Wright, S., and J. Miller. "Application of Spray-On Liquid Insulation for Thermal and Vibrational Management." In Marine & Offshore Coatings. RINA, 2010. http://dx.doi.org/10.3940/rina.coat.2010.01.

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Liao, H., C. Coddet, and L. Simonin. "Mechanical Properties of Thermal Spray PEEK Coatings." In ITSC2001, edited by Christopher C. Berndt, Khiam A. Khor, and Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p0315.

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Abstract The influences of process parameters on the microstructure of PEEK coatings deposited by flame spraying were analyzed by different physical and thermal methods, considering the density, the hardness and the Young's modulus. The cooling rate of the coating after spraying leads to large variations of the microstructure which evolves between the crystalline and amorphous states. Amorphous coatings exhibit less residual stress than semi-crystalline ones, which has an influence on the friction behavior.
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McGrann, R. T. R., J. Kim, J. R. Shadley, E. F. Rybicki, and N. G. Ingesten. "Characterization of Thermal Spray Coatings Used for Dimensional Restoration." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0341.

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Abstract Thick thermal spray coatings are used to repair worn parts during aircraft overhaul. The thermal spray coating is used to restore a part to its original dimensions. Characteristics of the as-applied coating that affect the performance of thermal sprayed parts are the residual stress in the coating, the tensile bond strength, the amount of porosity, oxides and impurities near the coating/substrate interface, and the hardness of the coating. An understanding of the relation of these coating characteristics to process variables such as the material used for the coating, spray process, spray angle, and thickness of the applied material is needed. In this paper, four thermal spray coatings, Ni5Al, Ni5Al-atomized, (NiCr)6Al, and Inco 718, on a substrate of Hastelloy X are investigated. These materials are applied using two different thermal spray application processes: plasma spray and High Velocity Oxy-Fuel (HVOF). Spray angles of 90° and 45° are used during spraying. The nominal thickness of the applied coatings ranges from 0.4 mm to 1.8 mm. The thermal spray coatings are evaluated in four types of tests. Residual stresses in the coatings and substrate are evaluated using the modified layer removal method. A tensile bond strength test is performed. Metallographic examination is used to determine the porosity and content of oxides and bond zone impurities (percent) of the applied materials. In addition, the hardness of the coating is measured. For the materials and conditions investigated, it is found that residual stress varies with each of the four process parameters. The bond strength for plasma sprayed coatings is related to the type of material and possibly to the coating thickness. The percent porosity varies with coating material, but, for Ni5Al, it does not depend on application process. Oxide content, as a percentage, varies with material and process, but not with spray angle and thickness. The percentage of impurities near the coating/substrate interface varies with process and, for the specimens that were coated using the HVOF process, with thickness. The hardness of the coating was found to vary with material and spray process. For three of the four coatings, hardness increases with thickness but, for Inco 718, hardness decreases as thickness increases.
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Reports on the topic "Spray coatings"

1

Biancaniello, Frank S., and Stephen D. Ridder. Thermal spray coatings workshop:. Gaithersburg, MD: National Institute of Standards and Technology, 1998. http://dx.doi.org/10.6028/nist.ir.6460.

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Atteridge, David G., Martin Becker, Graham A. Tewksbury, and Milton Scholl. Advanced Nanoscale Coatings with Plasma Spray. Fort Belvoir, VA: Defense Technical Information Center, April 2000. http://dx.doi.org/10.21236/ada378451.

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Mulligan, Christopher P., and Allison M. Welty. Analysis of Ta/Ni Multilayer Cold Spray Coatings. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada588310.

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Mahaffey, Jacob, and Joseph Padilla. Cold Spray of C22Gd Coatings for Nuclear Waste Storage. Office of Scientific and Technical Information (OSTI), September 2021. http://dx.doi.org/10.2172/1819412.

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Kiser, Matthew T. METAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/786857.

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D. Trent Weaver, Matthew T. Kiser, Frank W. Zok, Carlos G. Levi, and Jeffrey Hawk. METAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES. Office of Scientific and Technical Information (OSTI), February 2004. http://dx.doi.org/10.2172/833402.

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Kiser, Matthew T. METAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES. Office of Scientific and Technical Information (OSTI), January 2002. http://dx.doi.org/10.2172/793663.

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D. Trent Weaver and Matthew T. Kiser. METAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES. Office of Scientific and Technical Information (OSTI), October 2003. http://dx.doi.org/10.2172/822894.

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Matthew T. Kiser. METAL-MATRIX COMPOSITES AND THERMAL SPRAY COATINGS FOR EARTH MOVING MACHINES. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/828639.

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Kanouff, M. P. Simulation of surface roughness during the formation of thermal spray coatings. Office of Scientific and Technical Information (OSTI), July 1996. http://dx.doi.org/10.2172/412965.

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