Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"HVOF"”.
-
Study of Wear Mechanisms in Braking Systems with HVOF-Coated Discs
… deposited via high velocity oxygen fuel (HVOF) process. A further attempt for improving the wear resistance of the gray cast iron discs was performed by applying on them an industrial heat treatment. The cermet coatings have been widely employed in the field of the oil and gas industry for …
-
Mechanical and metallurgical properties of two-layered diamalloy 4010 and 2002 HVOF coating
Diamalloy 4010, which is iron/molybdenum blend, is resistive to wear and Diamalloy 2002 is resistive to corrosion and wear. However, combination of these powders in layered structure, may offer advantages over the individual powders. In this case, mechanical properties of the resulting layered …
-
Investigation into laser re-melting of inconel 625 HVOF coating blended with WC
High velocity oxy-fuel (HVOF) spraying of Diamalloy 1005 powders mixed with WC particles onto steel (304) is considered and laser re-melting of the resulting coatings is examined. Laser re-melting process is modeled to determine the melt layer thickness while temperature increase is formulated …
-
Effect of high velocity oxy-fuel (HVOF) coatings on fatigue behaviour of carbon steel
… the application of high velocity oxy-fuel (HVOF) spraying is widely used in various industries. This is due to its ability to improve the wear, erosion and corrosion resistance of components. However, by taking consideration of mechanical properties and fatigue behaviour into cognisance, the …
-
Study of the mechanical and metallurgical properties of AMDRY 9954 HVOF coated Ti-6A1-4V alloy
… properties of High Velocity Oxygen Fuel (HVOF) thermally sprayed AMDRY 9954 (Cobai.Ni32Cr21Al8Yo.5) superalloy powder on Ti-6A1-4V alloy are examined. The mechanical tests include three point bending, tensile, fatigue, indentation, and microhardness tests. The mechanical tests are applied …
-
Design of experiment analysis of high velocity oxy-fuel coating of hydroxyapatite
… cost effectiveness the high velocity oxy-fuel (HVOF) thermal spray process has been widely adopted by many industries. Though there are different types of flame spraying processes, the HVOF thermal spray process utilises only powder as the coating material rather than wire or rod. …
-
Study into mechanical and electrochemical properties of coating deposits and welded-coated components using the HVOF (High Velocity Oxy-Fuel) process.
… corrosion properties of High Velocity Oxy-Fuel (HVOF) thermal spray coatings of Inconel 625 powders on plain and welded surfaces of mild carbon and stainless steel (304). The research work carried out focused on coating adherence to base substrate, coating integrity and mechanical behavior of …
-
A comparative study on wear and corrosion behaviour of tungsten carbide-nickel (Wc-Ni) and tungsten carbide-cobalt (Wc-Co) high velocity oxy-fuel (HVOF) for carbon steel blade
… time to time. Therefore, high velocity oxy-fuel (HVOF) thermal spray was introduced to protect machine components from wear and corrosion, to restore worn components and to improve the durability of the components. HVOF is one of the process of depositing a material layer over a base metal or …
-
Charakterizace žárově stříkaného kovokeramického WC-CoCr povlaku na hořčíkové slitině AZ91
… vlastností. Depozice byla provedena metodou HVOF (High Velocity Oxy-Fuel). Teoretická část je věnována hořčíkovým slitinám se zaměřením na slitinu AZ91. Dále je v teoretické části pojednáno o metodách žárového stříkání, kdy je pozornost věnována především kovokeramickým WC-CoCr povlakům …
-
Design and development of a powder mixing device used in the deposition of high velocity oxy-fuel (HVOF) thermal spray functionally graded coatings; Kabir Al Mamun
… different proportions of powders. However the HVOF (High Velocity Oxy-Fuel) process does not possess this feature. FGMs vary in composition and/or microstructure from one boundary (substrate) to another (top service surface), and innovative characteristics result from the gradient from metals …
-
Investigation of erosion-corrosion behaviour of pump materials
… with austenitic based alloys. Sintered and HVOF coatings WC-based cermets of similar chemical composition were studied to elucidate the influence of the manufacturing process on their erosion-corrosion response of the cermets. The manufacturing process effect resulted to be significant as …
-
The effect of bond coat oxidation on the microstructure and endurance of two thermal barrier coating systems
… by either high velocity oxy-fuel spraying (HVOF) or EBPVD. Isothermal oxidation tests were carried out at 950°C, 1050°C and 1150°C for both coating system for up to 3000 hours. Cyclic oxidation testing was conducted at 1150°C in one hour cycles to coating failure on both coatings. A detailed …
-
Microstructural analysis of thermal spray coatings by electron microscopy
Plasma and High Velocity Oxy-Fuel (HVOF) spraying are two of the most common thermal spray processes. In both methods, heated particles are sprayed through a flame (either plasma or oxygen fuelled), before being projected at high velocity towards a substrate. Upon impact they flatten, forming …
-
Electrical Breakdown of Thermal Spray Alumina Ceramic Applied to AlSiC Baseplates Used in Power Module Packaging
… process and the thermal high-velocity oxyfuel (HVOF) coating process. ASTM specifications defining appropriate testing procedures are used in testing the dielectric strength of these coupons. Issues relating to the dielectric strength and dielectric leakage current are evaluated and validated at …
-
Erosion-Corrosion of Cr3C2-NiCr High Velocity Thermal Spray Coatings
… were deposited by Aerospray HVAF, GMA Microjet HVOF, Stellite Jet Kote HVOF and TAFA JP-5000 HVOF spraying under optimised conditions using agglomerated/sintered and blended powders. The prealloyed powder based coatings, characterised in terms of microhardness, porosity content and phase …
-
Study of Titanium based Composite Coatings for Resistance against Molten Aluminium Soldering on H13 Tool Steel
… surfaces operating in severe environments. An HVOF thermally sprayed coating has the advantage of having excellent bond strength and very low porosity levels (< 1%). This research work is concerned with producing and evaluating the performance of titanium/alumina based composite coatings to …
-
Microstructural modelling of fatigue in layered bearing architectures
… difference in the observed fatigue life. In the HVOF systems, crack initiation was observed to be from the weaker interface between a harder matrix and softer circular unmelts as well as from various scattered pores. The overall fatigue life of the HVOF systems was comparable to the previous roll …
-
NOVEL NANOMATERIALS FOR ENERGY RELATED APPLICATIONS
… 2, superior corrosion resistance properties of HVOF thermal spray of TiC and TiB2 coatings on 304H stainless steel, 430, and P91 steels were reported. The coatings successfully served at a protection layer by limiting oxygen penetration, sulfur attack, and decreased the formation of pits and …