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Дисертації з теми "HVOF SPRAYED"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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1

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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Анотація:
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.<br>Nanostructured coatings were obtained by thermally spraying cr
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2

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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Анотація:
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, Greenhe
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3

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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Анотація:
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
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4

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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Анотація:
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-as
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5

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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6

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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7

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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Анотація:
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 w
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8

Kutschmann, Pia, Thomas Lindner, Kristian Börner, Ulrich Reese, and 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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Анотація:
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 dept
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9

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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Анотація:
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 environ
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10

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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Анотація:
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 p
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11

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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Анотація:
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 g
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12

Vacek, Petr. "Modifikace vrstev deponovaných technologiemi HVOF a cold spray pomocí technologie elektronového paprsku." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2016. http://www.nusl.cz/ntk/nusl-254211.

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Анотація:
The aim of this thesis was to modify microstructure and coating-substrate interface of CoNiCrAlY coatings deposited by HVOF and cold spray on Inconel 718 substrates. Electron beam remelting and annealing in a protective atmosphere were used to modify the coatings. Microstructure, chemical and phase composition were analyzed. The effect of beam current, transversal velocity and beam defocus on remelted depth was evaluated. As-sprayed microstructure and chemical composition of coatings were analyzed and compared with remelted samples. The effect of annealing of the as-sprayed and remelted sample
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13

Nucci, Rafael. "Avaliação da resistência ao desgaste de cermets depositados pelo processo HVOF e do cromo duro eletrolítico." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-15122010-094209/.

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Анотація:
Desgaste é um dos três principais problemas industriais comumente encontrados, que levam à substituição de componentes e equipamentos em engenharia. A possibilidade de se recuperar esses componentes, ou prepará-Ios para suportar melhor as condições de trabalho, é constantemente estudada e novas técnicas são propostas, sempre no sentido de aumentar a vida útil e reduzir custos operacionais. Esta é a razão para o aumento da importância dos sistemas de revestimentos. O cromo duro eletrolftico tem sido muito utilizado para conferir resistência ao desgaste elou à corrosão, porém as características
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14

Torkashvand, Kaveh. "Tribological behaviour ofHVAF-sprayed WC-based coatings: : Role of process variables and binder chemistry." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-17484.

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Анотація:
Tungsten carbide (WC) based metallic matrix coatings sprayed using high velocity air fuel (HVAF) technique have attracted increasing attention as they show excellent tribological performance in various wear conditions. In the HVAF method, particles’ in-flight temperature and velocity can be influenced by the process variables including nozzle configuration as well as feedstock particle size range. On the other hand, the chemistry of metallic binder can also play a key role in determining both properties and performance of these coatings. In this thesis, characteristics and tribological behavio
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15

Souza, Matheus Machado de. "Avaliação do comportamento tribológico e das propriedades de superfície do aço 4140 revestido pelos processos HVOF e cromo duro eletrodepositado." Universidade do Estado de Santa Catarina, 2014. http://tede.udesc.br/handle/handle/1665.

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Анотація:
Made available in DSpace on 2016-12-08T17:19:23Z (GMT). No. of bitstreams: 1 Matheus Machado de Souza.pdf: 5533626 bytes, checksum: a5f582284c7919cc899d81e7de2c62c8 (MD5) Previous issue date: 2014-08-25<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The use of coatings based in electrolytic chromium deposition causes damages to the environment, since during the process, hexavalent chromium ions are released and these are extremely toxic to nature and man. However, other technologies have been studied as alternatives to the traditional chromium electroplating process. The t
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16

Clavijo, Mejía Germán Andrés. "Development of Radio-opaque Bioglass/Hydroxyapatite coatings deposited by HVOF and SPS thermal spray for biomedical applications." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0099.

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Анотація:
L'hydroxyapatite (HAp) et le verre bioactif (BG) 45S5 sont largement utilisés comme précurseurs des revêtements fabriqués par projection thermique pour améliorer la biocompatibilité des implants biomédicaux. Ceci, en raison de la structure similaire de l'HAp avec le tissu osseux et la haute réactivité de ce BG en milieu biologique, ce qui permet la croissance rapide du tissu osseux à sa surface. La projection combinée des deux matériaux permet d’obtenirdes revêtements hautement bioactifs et stables par rapport aux revêtements individuels. De plus, la bioactivité de l'HAp et la radio-opacité de
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17

Löbel, Martin, Thomas Lindner, Thomas Mehner, and Thomas Lampke. "Microstructure and Wear Resistance of AlCoCrFeNiTi High-Entropy Alloy Coatings Produced by HVOF." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-230210.

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Анотація:
The investigation of high-entropy alloys (HEAs) has revealed many promising properties. HEAs with a high share of Al and Ti are suitable for the formation of lightweight materials. Investigations of the alloy system AlCoCrFeNiTi showed high strength, hardness, ductility, and wear resistance, which makes this special alloy interesting for surface engineering and particularly for thermal spray technology. In this study, the suitability of inert gas-atomised HEA powder for high-velocity-oxygen-fuel (HVOF) thermal spray is investigated. This process allows for high particle velocities and comparat
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18

Rupprecht, Christian. "Neue Methoden und Anwendungen des Thermischen Spritzens." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-102496.

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Анотація:
Die Habilitation befasst sich mit neuen Verfahren und Anwendungen des Thermischen Spritzens, beleuchtet anhand einer internationalen Umfrage den Forschungsbedarf der Branche und liefert zahlreiche Lösungen, die im Rahmen von grundlagenorientierten und industrienahen Forschungsvorhaben erarbeitet wurden. Der Fokus der Arbeit liegt auf der Verbesserung individueller Arbeitsschritte der Prozesskette des Thermischen Spritzens, wobei Ergebnisse aus den Bereichen Werkstoffentwicklung, Prozessoptimierung, Qualitätssicherung und Nachbearbeitung zusammengeführt und durch konkrete Anwendungsbeispiele hi
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19

Ottosson, Andreas. "Thermal spraying by HVAF as an environmentally friendly alternative to electrolytic hard chrome plating of piston rods." Thesis, Högskolan Väst, Avd för maskinteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-5797.

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20

Piňos, Jakub. "Studium vlastností kovových materiálů připravených technologií nízkoteplotního kinetického naprašování." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230857.

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Анотація:
Cold spray is a novel coating method. Due to its low-temperature character, it has a potential to replace the high-temperature thermal spray processes in some applications. The presented work analyzes the microstructure and the phase composition of pure metal coatings deposited by cold spraying and evaluates selected mechanical properties. Specimens prepared by readily used HVOF industrial technology were used for comparison purposes.
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21

Castro, Richard de Medeiros. "Avaliação das propriedades de superfície e do comportamento ao desgaste abrasivo de hastes de cilindros hidráulicos revestidas pelos processos HVOF e cromo duro eletrodepositado." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/70708.

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Анотація:
Devido à necessidade de obtenção de uma superfície resistente ao desgaste e a oxidação, os cilindros hidráulicos são tradicionalmente revestidos com cromo duro eletrodepositado. Todavia, este tipo de revestimento apresenta uma redução gradual do coeficiente de atrito, interferindo diretamente na lubrificação da haste, ocasionando danos aos elementos de vedação e promovendo consequentes vazamentos. Outro apelo contrário à utilização do processo de revestimento com cromo é a presença, em elevados níveis, de cromo hexavalente Cr+6, apresentando alto poder cancerígeno e de contaminação ambiental.
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22

Cének, Lukáš. "Stanovení vlastností původních a EB-modifikovaných nástřiků deponovaných technologiemi tepelného nanášení pomocí vrypové zkoušky a testování nano-indentací." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-231364.

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Анотація:
Properties of samples and their coatings may be affected by the electron beam. This paper deals with the analysis of the microstructure, phase and chemical composition and the determination of mechanical characteristics of inconel steel substrate and CoNiCrAlY coatings deposited via different types of thermal spraying (HVOF, cold spray), in combination with modifications by the electron beam technology. During the study it was found that the deposition did not change the chemical composition. Further it was found that the interaction of the electron beam with the material did not change the ch
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23

Barradas, Sophie. "Etude, à l'aide du choc laser, des mécanismes d'adhérence aux interfaces cuivre/aluminium et cuivre/cuivre obtenues par projection thermique." Phd thesis, École Nationale Supérieure des Mines de Paris, 2004. http://tel.archives-ouvertes.fr/tel-00273506.

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Анотація:
La réalisation de revêtements projetés de haute qualité passe par une bonne cohésion du dépôt et une adhérence élevée des revêtements sur leur substrat. Du fait de leur mode d'élaboration, les microstructures des interfaces dépôt/substrat et particule/particule obtenues par projection thermique sont complexes et les propriétés en dépendant hétérogènes. Afin d'optimiser l'adhérence des revêtements, il est nécessaire d'établir des relations entre microstructure et résistance de ces interfaces. C'est l'objet de cette étude. Le système modèle cuivre projeté sur aluminium a été retenu non seulement
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24

Roy, Jean-Michel L. "Development of Cold Gas Dynamic Spray Nozzle and Comparison of Oxidation Performance of Bond Coats for Aerospace Thermal Barrier Coatings at Temperatures of 1000°C and 1100°C." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/20681.

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Анотація:
The purpose of this research work was to develop a nozzle capable of depositing dense CoNiCrAlY coatings via cold gas dynamic spray (CGDS) as well as compare the oxidation performance of bond coats manufactured by CGDS, high-velocity oxy-fuel (HVOF) and air plasma spray (APS) at temperatures of 1000°C and 1100°C. The work was divided in two sections, the design and manufacturing of a CGDS nozzle with an optimal profile for the deposition of CoNiCrAlY powders and the comparison of the oxidation performance of CoNiCrAlY bond coats. Throughout this work, it was shown that the quality of coatings
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25

Slavíková, Barbora. "Struktura a vlastnosti tepelných bariér typu YSZ nanesených na krycí vrstvy CoNiCrAlY přetavené elektronovým paprskem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400863.

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Анотація:
The master thesis is dealing with characterization of the structure and properties of the YSZ thermal barrier coating deposited by water hybrid plasma spray technology on the CoNiCrAlY bond coats modified by using electron beam and vacuum annealing. Deposition of the bond coats was performed via high velocity oxy-fuel technology and cold spray. In case of experimental evaluation, the microstructure and chemical composition of the ceramic top coat deposited with powder and suspension feedstock was analyzed. The same analysis procedure was used also for bond coats after electron beam remelting b
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26

Lin, Ruey-Yi, and 林瑞沂. "Studies on HVOF Thermally Sprayed WC-Co Coatings." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/81167156756996636232.

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碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>96<br>ABSTRACT Capable of the characteristics of high velocity and low temperature combustion gases, the high velocity oxygen fuel (HVOF) thermal spray technique has become very popular for generating the WC-Co coatings. In this study, two WC-12Co coatings were deposited onto JIS SS41 mild steel substrate by the HVOF process using two kinds of commercially available feedstock powders produced by agglomerated method and fused-crushed method separately. The coatings were annealing heat treated at different temperatures (6000C, 8000C and 10000C) in an argon atm
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27

KUMAR, ALOK. "TRIBOLOGICAL STUDY OF HVOF SPRAYED TUNGSTEN CARBIDE COATED STAINLESS STEEL." Thesis, 2020. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18316.

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Анотація:
Corrosion and Wear, or combination of both, are the main causes of degradation of metals used in various industrial sector. Degradation of the metals can be slowed down by adding a layer of resistant coating on metal surface. This coating separates the base metal from a corrosive environment, reduces wear and improves the appearance of the metal. The workpiece after coating becomes a composite that have properties far better than the substrate alone. There are various coating techniques, HVOF is one of the most important and widely used process to protect the metals from wear, corrosion
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28

Lin, Yi-Sheng, and 林益生. "Study on The High Toughness HVOF Sprayed WC/Co Nanocermet Coatings." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/v7v47n.

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Анотація:
碩士<br>國立臺北科技大學<br>機電整合研究所<br>93<br>Thermal spraying technology has been used in industry extensively. High velocity oxy-fuel (HVOF) process WC/Co coating is suitable for aviations, vehicles, printings and petroleum industry especially in erosions, abrasions and high temperatures environment. It is extremely important to characterize the WC/Co powder to understand the performance of the coating. Otherwise, nanostructured WC/Co powders have been succeeded commercialize so HVOF deposits nanostructured WC/Co coating has been highly regarded. Due to the surface/volume ratio of nanostructured WC/Co
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29

Tsai, Ya-Yu, and 蔡亞諭. "Microstructural Evaluation and Wear Mechanisms of HVOF Thermally Sprayed WC-Co Coatings." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/11941272064929072791.

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Анотація:
碩士<br>國立高雄應用科技大學<br>機械與精密工程研究所<br>101<br>Capable of the characteristics of high velocity and low temperature combustion gases, the high velocity oxygen fuel (HVOF) thermal spray technique has become very popular for generating the WC-Co coating. In this study, the WC-12Co coating were deposited onto JIS SS41 mild steel substract by the HVOF process using the commercially available feedstock powders produced by fused-crushed method. The coating were different. One was without annealing treatment, and the other was annealing heat treated at 1000 in an argon atmosphere chamber. The coatings were
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30

Ben, Mahmud T., Tahir I. Khan, and M. A. Farrokhzad. "Heat treatment effect on wear behaviour of HVOF-sprayed near-nanostructured coatings." 2016. http://hdl.handle.net/10454/17079.

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Анотація:
No<br>This study investigates the effect of heat treatment on changes in microstructure and wear behaviour of WC-NiCr coatings. Two feedstock powders with a similar chemical composition and different particle sizes (near nano-structured WC-17NiCr and microstructured WC-15NiCr) were used. High-velocity oxyfuel spraying technique was used to deposit coatings on to a mild steel substrate using identical spraying parameters. Coated samples were then heat treated in a nitrogen atmosphere at 500 and 700°C. The effect of heat treatment on changes in hardness and wear performance of the coatings was s
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31

Huang, Te-Yi, and 黃德宜. "Study on Wear Resistance of Ni-based Self-Fluxing Alloy Sprayed by HVOF." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/857mzc.

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Анотація:
碩士<br>國立臺北科技大學<br>機電整合研究所<br>96<br>This study focuses on the effects of the reflowing process on the physical properties、hardness analysis and wear test by four Ni-based self-fluxing alloy powders with different particle size mixed WC-Co powder by different weight ratio under reflowing temperature 950°C、1000°C and 1050°C by nitrogen in atmospheric pressure after thermal spray. The results show that the dense coatings can be prepared and also exhibit good hardness and wear performance at reflowing temperature of 950℃. On the phase change, chromium increases the hardness of the coatings by the f
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SU, YUNG-CHUAN, and 蘇永川. "The Study of Mechanical Properties of Co-base Alloy Coatings Sprayed by HVOF and Zirconia Ceramic Coatings Sprayed by APS." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/spj98x.

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碩士<br>國立高雄應用科技大學<br>機械工程系<br>106<br>For the purpose of improving operational efficiency of combined cycle plants, increasing the inlet fuel gas temperature of gas turbines has become the international trend of power plants development nowadays. However, while under the influence of elevated temperatures and hot corrosion environment, hot section components are rapidly in a performance degradation and even crack. The characteristics of ceramics of Thermal Barrier Coating(TBC) at thermal durability and thermal insulation, not only can increase the inlet fuel gas temperature of gas turbines but a
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PAI, WEI-LUNG, and 白偉龍. "The Study of Mechanical Properties of Co-base Coating Sprayed by Gas and Liquid-fuelled HVOF." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/47451112192463864433.

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碩士<br>國立高雄應用科技大學<br>機械工程系<br>105<br>Due to its advantages such as fast flame velocity, bonding strength, high density and low porosity, thermal coatings applied by High Velocity Oxygen Fuel thermal spray technique is widely used in the industry and aero components. The study uses commercial spray powder that is cobalt-based on substrate material Inconel 718 and observes the flame characteristics of the two processes (HVOGF and HVOLF) with monitoring system during thermal spray process. The characteristics to be observed include the velocity of molten particles, plume temperature and total inte
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Ting, Shih-Cheng, and 丁士程. "Study on Promoting Wear Behavior of HVOF Sprayed Self-Fluxing Coatings with and without WC and Cr3C2 additions." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/2etm8b.

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碩士<br>國立臺北科技大學<br>製造科技研究所<br>97<br>The study is using high velocity oxy-fuel spraying to achieve NiCrBSi self fluxing alloy coating. Moreover, WC or Cr3C2 is added into the self fluxing alloy coating. The coatings were re-melted at 950°C, 1000°C and 1050°C respectively. The relation between different conducting parameters and the coating’s surface formation, microstructure, hardness and porosity is systematically analyzed. At last, the mechanical properties and wear characteristics of the coating are in comparison. The results show the NiCrBSi coating which is treated by re-melting at 950°C re
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Wang, Bo-Chin, and 王柏欽. "A Study on the Microstructure and Surface Property Evaluation of Coating Produced from Reinforced WC/Co Addition Cast Iron Powder HVOF-Sprayed on Mild Carbon Steel." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/32305745412128752427.

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碩士<br>遠東科技大學<br>機械工程研究所<br>103<br>WC/Co thermal spray coating features excellent high hardness, high wear resistance, high elastic modulus, chemical intertness and low coefficient of friction. These unique qualities have made WC/Co coating an ideal candidate for enhancing wear resistance of engineering components such as cutting tools, extrusion molds and rolls etc. With features such as high stacking rate, high adhesion and lower porosity, high velocity oxygen fuel (HVOF) can reduce oxidation of thermal spray coatings and increase their compactness and adhesion. The problem faced by the indus
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Lin, Ta-Hsin, and 林大新. "The Study of Wear and Corrosion Resistance of Fe-Based Metallic Glass Coating Prepared by HVOF Thermal Spray." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/08765534467507578221.

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碩士<br>國立中央大學<br>機械工程學系<br>104<br>Fe-base metallic glass is famous for its high hardness high stress and good corrosion resistance. Compare to other kind metallic glass, Fe-base has higher stress and low coast. This study use Fe-Cr-Mo-C-B-Y-Co series composition bond coats on the 304 stainless steel by High Velocity Oxygen Fuel (HVOF) thermal spray. Investigate its mechanical properties and electrochemistry properties. Optical Microscope shows a homogeneous, crack-free surface and cross section. Hardness from 262 ± 24HV to 1066±53HV, In the wearing test, load 5N normal force at WC ball and
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Rupprecht, Christian. "Neue Methoden und Anwendungen des Thermischen Spritzens." Doctoral thesis, 2012. https://monarch.qucosa.de/id/qucosa%3A19824.

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Die Habilitation befasst sich mit neuen Verfahren und Anwendungen des Thermischen Spritzens, beleuchtet anhand einer internationalen Umfrage den Forschungsbedarf der Branche und liefert zahlreiche Lösungen, die im Rahmen von grundlagenorientierten und industrienahen Forschungsvorhaben erarbeitet wurden. Der Fokus der Arbeit liegt auf der Verbesserung individueller Arbeitsschritte der Prozesskette des Thermischen Spritzens, wobei Ergebnisse aus den Bereichen Werkstoffentwicklung, Prozessoptimierung, Qualitätssicherung und Nachbearbeitung zusammengeführt und durch konkrete Anwendungsbeispiele hi
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BAIAMONTE, LIDIA. "Rivestimenti protettivi per valvole di motori navali." Doctoral thesis, 2016. http://hdl.handle.net/11573/985808.

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Intake and exhaust valves operating in diesel engines for naval propulsion suffer from several problems due to the combined and synergistic effects of mechanical stresses and a chemically harsh environment. Degradation mechanisms like wear and corrosion act on different sections of the valve, with the result that each part undergoes a different kind of damage. The present work particularly focuses on degradation phenomena such as low temperature corrosion and erosive wear on the stem; hot corrosion on the bottom of the head of the valve; wear on the seat ring. In order to prevent the valves fr
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