A new polyfluorinated anti-staining coating material CF3O(CF2CF2O)xCF2-CONHCH2CH2CH2Si(OCH3)3 has been developed by utilizing the PERFECT method, which employs a liquid-phase direct fluorination reaction with elemental fluorine as a key step. Direct fluorination of a partially-fluorinated ester, which was prepared from a non-fluorinated poly(ethylene glycol) and a perfluorinated acyl fluoride, ...

This study investigates the formation of a chromate conversion coating at Al-Cu-Fe-Mn intermetallic sites of an Al2219 alloy and the corrosion initiation at these sites in a 3.5 % NaCl solution, using SEM, AES and EDX. Changes in the surface chemistry were monitored after progressive exposures to the solution up to 42 hours. The coating was found to be thinner and more defective on the intermet...

Scanning tunneling microscopy was used to study molecular order in monolayer organic films formed by solution-phase growth from thermotropic liquid crystal solvents. The films develop macroscopically uniaxial alignment, with adlayer orientation controlled by an external magnetic field through interactions mediated by the liquid crystal. Results are presented for two films deposited from nematic...

Graphene nano platelets (GNP) have several attractive properties, including excellent lubricity that can be used to develop wear-resistant coatings. Thermally sprayed chromium carbide–nickel (Cr3C2–NiCr) coatings are widely employed impart wear resistance engineering components. This work attempts improve the of high velocity air fuel (HVAF) Cr3C2–NiCr by incorporating GNP using a hybrid approa...

High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility-brittleness AlCoCrFeNiSi system was chosen as an object of study, and the ...

In the marine environments, NiCrAlY coatings with high content of Cr would suffer much severer corrosion due to effect NaCl. Thus, NiSiAlY different Si were proposed and deposited on Ni-based superalloys by multi-arc ion plating. The as-deposited coating was mainly composed γ’-Ni 3 Al phase a small amount β-NiAl phase. NaCl-induced hot tests performed at 500°C, 600°C, 700°C, respectively. Compa...

Since the {irst demonstration of organic photo voltaic devices much progress has been made. Organic solar cells reach now power conversion efficiencies of up to 3% over the solar spectrum. The morphology of the active film is very important for efficient devices. Films spin-coated from blend solutions phase separate. The scale of the phase separation depends on the solvent, solubility of the ma...

Axial plasma spray is one of the thermal techniques to deposit multifunctional advanced coatings. The present work explores use this process thin, continuous, and adherent Ca5 (PO4)3OH (hydroxyapatite, HAp) coatings characterize its microstructure, phases, hardness adhesion strength. Three different suspension-deposited HAp were investigated compared with powder-deposited coating on a Ti6Al4V s...

several investigations have been devoted towards understanding the coating process in fluidized beds. most of these studies focused on spraying liquid droplets over the bed. however, due to the complexity of these systems, more investigations are still required to quantify the effect of operating conditions on the coating criteria. the present work aims at fundamentally understanding and precis...

Pure and 10 wt% 80Al2O3-20TiO2 reinforced hydroxyapatite coatings were successfully deposited on Ti6Al4V substrate by plasma spray technique for bio medical applications. Post coating heat treatment was carried out to study the effect of heat treatment on improvement in micro structure and mechanical properties of coatings. Coating was characterized by SEM/EDAX and XRD analysis. Positive impact...