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Showing 1 to 20 of 23 for “"coating adhesion"”.
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The notched coating adhesion specimen: a fracture test for coatings and accelerated screening test for adhesion
A simple adhesion test method is proposed to provide estimates of the debond toughness of adhesive bonds. Notched coating adhesion (NCA) specimens consist of single substrates coated with thin layers of adhesive. The coating is notched to induce initial debonds, and the specimen is then loaded in a …
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Effect of combined nanoparticle and polymeric dispersions on critical heat flux, nucleate boiling heat transfer coefficient, and coating adhesion
… performed to determine thermal performance and adhesion effects of a combined nanoparticle and polymeric dispersion coating. The critical heat flux (CHF) values and nucleate boiling heat transfer coefficients (HTC) of nickel wires pre-coated using 1.0% alumina, 0.1% alumina, 500ppm …
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Development of high performance and efficient coating repair systems for offshore tropical marine environment
Rehabilitation coatings of offshore equipment rarely perform as well as the original coating, despite the high cost involved. The performance gap is probably due to high relative humidity, salt contamination and limitations on the use of abrasive blast cleaning. Thus, this research aims to deepen …
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Adhesion Strength of Cordierite Bulk Coatings on Molybdenum Substrates
… nickel, and chromium. The development of a coating adhesion test methodology was required to choose between interface designs. An indentation method was chosen because of ease in testing and availability of fracture mechanics interpretations of test data. The interfacial fracture toughness …
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The Adhesion Strength of a Plasma Sprayed Silicon Bond Coating on a Silicon Carbide Ceramic Matrix Composite
… turbine engines. Environmental barrier coatings (EBCs) are essential for implementing these components as they insulate and protect the substrate from reaction with water vapor in the engine environment. EBCs are typically deposited via atmospheric plasma spraying (APS) and preparing the …
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Development of high performance tribological coatings for application onto hip joint prostheses
In this thesis Graphit-iC™, an amorphous carbon coating developed by Teer Coatings Ltd. was modified and deposited onto CoCr and WHMWPE substrates in order to improve the wear properties. It was identified that depositing a hard coating onto soft substrate would cause high stresses and lead to …
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Adhesion and Durability of Coatings on Polypropylene Exterior Sidings
… siding must be coated. The requirements of a coating for siding are good adhesion, durability, and a suitable appearance. However, polypropylene, like many plastics, has a low surface energy, making wetting and coating adhesion difficult.</p> <p>One of the many ways to increase the surface …
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Corrosion Protection Service Life of Epoxy Coated Reinforcing Steel in Virginia Bridge Decks
… by ECR field specimens with various degrees of coating adhesion: disbonded, partially disbonded, and wholly bonded coatings. The size and length distributions of cracks in Virginia bridge decks were investigated to assess the frequency and severity of cracks. Correlation of cracks with chloride …
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Surface analysis of sodium oleate coated poly (ethylene terephthalate) films
… alter surface properties resulting in improved adhesion and wettability. The objective of the present work was to demonstrate the applicability of surface-sensitive techniques in the analysis of polymer films coated with thin overlayers. The surface or interphase region of sodium oleate coated …
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Study into mechanical and electrochemical properties of coating deposits and welded-coated components using the HVOF (High Velocity Oxy-Fuel) process.
… 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 coating at the …
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A chemical and mechanical evaluation of interfacial fracture in dicyandiamide cured epoxy/steel adhesive systems
… cantilever beam (DCB), fatigue DCB, and notched coating adhesion (NCA) interfacial fracture performances all increased. X-ray photoelectron spectroscopy (XPS) and tunneling electron microscopy (TEM) analyses of the failed specimens revealed that chemical changes were more prominent at the …
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Quantitative evaluation of thin film adhesion using the probe test
… as a quantitative tool for measuring the adhesion in thin adhesive films and coatings. The technique was initially developed as a qualitative test by the Hewlett-Packard Company for measuring adhesion of thin film microelectronic coatings. In the probe test method, an inclined needle-like …
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Phase selective flame-retardant laminates
… approach involves applying external protective coatings to carbon fibre-reinforced polymer (CFRP) laminates using three configurations: cellulose nanofibres CNF/clay nanocomposite papers, commercial intumescent coatings based on expandable graphite, and vermiculite-based nonwoven mats. These …
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Supersonic Laser Deposition and LaserForge: Process Mechanism Coating Characteristics
LaserForge is a commercial coating process, that uses a pulsed laser to deposit flat sided wire onto a substrate with minimal heat input. Supersonic Laser Deposition (SLD) is an emerging coating technology that can be used as an alternative to existing thermal spray processes. It has the benefit of …
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Bonding mechanisms in the application of thermal barrier coatings to turbine blades.
Thermal barrier coatings (TBC's) are used to protect gas turbine blades from environmental degradation as well as to increase thermodynamic efficiency. Most TBC systems consist of a ceramic thermal barrier coating such as partially stabilized zirconia adhering to an oxidation resistant bond coat, …
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Mechanical Characterization of Coating-Interconnect Interfaces and Anode-Electrolyte Interfaces for Solid Oxide Fuel Cells
… integrity of various interfaces, for example, coating-interconnect interfaces and electrode-electrolyte interfaces play an important role in increased power density of an SOFC.In the first part of the present investigation, the interfaces between oxide coatings and interconnects are …
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Engineered surfaces for enhanced performance using thin film coating
… characterisation of diamond like carbon (DLC) coating using plasma enhanced chemical vapour deposition (PECVD). Unbalanced magnetron sputter ion plating at various flow rates, magnetron power and substrates has been used to deposit novel intermetalic NiAI and nitrogen doped NiAI thin films. …
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Investigation of parameters governing the corrosion protection efficacy of fusion bonded epoxy coatings
… through the application of fusion bonded epoxy coatings. The purpose of this study was to investigate various coating and exposure parameters to determine their effects on the corrosion of reinforcing steel. The parameters investigated were: chloride content at the bar depth, coated bar corroded …
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Deposition and characterisation of (Ti,Zr) based hard compound and multi-layer PVD films.
… to a significant increase in the use of surface coating technologies. An important process for the production of such coatings is Physical Vapour Deposition (PVD) which has proved to be a consistent, reliable and improving technique for industry. In the area of advanced wear resistant coatings …
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Evaluation of Stain Blocking Primer Coatings with Low Volatile Organic Compound (VOC) Content and Effects of Drying Conditions on the Properties of Water Reducible Coatings for Polypropylene
… 350 g/L to 100 g/L in January of 2012. These coatings are primarily used as stain blocking primers over a variety of substrates, such as wood and drywall. Currently the stain blocking primers that are considered most effective are solvent based primers that contain VOC levels much higher than …
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