Coating Properties | ScienceGate

Coating properties determine its behavior in operation. The simulation of future operational conditions is therefore the best quality test. The evaluation during operation is usually not possible to perform, and the coatings are therefore frequently characterized by their physical or mechanical properties. This text deals with the high temperature corrosion of HVOF sprayed Stellite 6 coating and with changes of its local mechanical properties before and after the corrosion testing. High temperature corrosion is defined as a corrosion in the presence of molten salts. In this case, the mixture of salts in composition of 59% Na2(SO)4 with 34.5% KCl and 6.5% NaCl was used. Two exposure temperatures 525 °C and 575 °C were selected and the tests for both temperatures were performed in the time interval of 168h in the autoclave. The coating with salt mixture layer was analyzed using scanning electron microscopy and nanoindentation. The high temperature resistance of Stellite 6 coating was evaluated according to the changes in the coating surface and by the occurrence of individual phases formed on the coating surface during the test. Generally, it can be said that the Stellite 6 alloys deposited by HVOF technology show selective oxidation under the salt film. This fact was also proved in this study. Furthermore, the nanoindentation measurements of Stellite 6 coating were performed before and after the corrosion testing. These measurements were used to evaluate the change of local mechanical coating properties.

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Surface Wear Improvement of Al-Alloys by Amorphous Iron-Based Flame-Sprayed Coatings

Materials Science Forum ◽

10.4028/www.scientific.net/msf.690.405 ◽

2011 ◽

Vol 690 ◽

pp. 405-408 ◽

Cited By ~ 2

Author(s):

Joel Voyer

Keyword(s):

Wear Resistance ◽

Flame Spraying ◽

Flame Spray ◽

Phase Content ◽

Coating Properties ◽

Amorphous Iron ◽

Spray Process ◽

Spraying Parameters ◽

Iron Based ◽

Sprayed Coatings

Partially amorphous iron-based coatings were produced onto aluminium using a powder flame-spraying process with a commercially available feedstock powder (Nanosteel SHS-7170) obtained from the Nanosteel Company Inc.. Several coating properties such as the microstructure, porosity, phase content, micro-hardness, and wear resistance were evaluated in the as-sprayed condition. As shown by the results obtained, the powder flame iron-based coatings perform relatively well in term of wear resistance in comparison with similar coatings produced using other expensive thermal spray techniques. Furthermore, this study shows that all the coating properties (microstructure, porosity, phase content, hardness and wear performance) depend strongly on the flame spraying parameters used. Finally, this paper demonstrates clearly that the flame-spray process may be used to produce amorphous iron-based coatings having a good wear resistance, and that this process appears to be a suitable inexpensive alternative to plasma or HVOF processes based on the present results.

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The use of hollow sphere pigments as strength additives in paper and paperboard coatings—Part 1: The predictive nature of packing models on coating properties

TAPPI Journal ◽

10.32964/tj19.11.585 ◽

2020 ◽

Vol 19 (11) ◽

pp. 585-593

Author(s):

ETHAN GLOR ◽

BRIAN EINSLA ◽

JOHN ROPER ◽

JIAN YANG ◽

VALERIY GINZBURG

Keyword(s):

Particle Size ◽

Hollow Sphere ◽

Particle Packing ◽

Particle Sizes ◽

Coating Properties ◽

Ideal System ◽

Thermal Paper ◽

Effect Of Particle Size ◽

Low Levels ◽

Better Than

Hollow sphere pigments (HSPs) are widely used at low levels in coated paper to increase coating bulk and to provide gloss to the final sheet. However, HSPs also provide an ideal system through which one can examine the effect of pigment size and particle packing within a coating due to their unimodal and tunable particle sizes. The work presented in Part 1 and Part 2 of this study will discuss the use of blends of traditional inorganic pigments and HSPs in coating formulations across a variety of applications for improved coating strength. Part 1 of this study focuses on the theory of bimodal spherical packing and demonstrates the predictive nature of packing models on the properties of coating systems containing HSPs of two different sizes. This study also examines conditions where the model fails by examining the effect of particle size on coating strength in sytems like thermal paper basecoats where the non-HSP component has a broad particle size distribution, and how these surprising trends can be used to generate better-than-expected thermal printing performance in systems with low HSP/clay ratios. Part 2 of this study focuses on the incorporation of HSPs of different particle sizes into paperboard formulations to affect coating strength and opacity.

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One-pot synthesis of double silane-functionalized carbon dots with tunable emission and excellent coating properties for WLEDs application

Nanotechnology ◽

10.1088/1361-6528/ac4067 ◽

2021 ◽

Author(s):

Wenbing Cao ◽

Yuhan Wu ◽

Xin Li ◽

Xuanfeng Jiang ◽

Yuhong Zhang ◽

...

Keyword(s):

Optical Properties ◽

Carbon Dots ◽

Great Influence ◽

Alkoxy Group ◽

Color Temperature ◽

Molar Ratio ◽

Coating Properties ◽

One Pot ◽

Light Emitting ◽

Light Emitting Devices

Abstract Silane-functionalized carbon dots (SiCDs) can be exploited as effective color converting materials for the solid-state light-emitting devices. However, most of SiCDs reported thus far have shown photoluminescence emissions in the blue and green spectral range, which limit them to construct an efficient white light-emitting diodes (WLEDs) due to the lack of long-wavelength emission. Herein, a series of double silane-functionalized carbon dots (DSiCDs) were prepared via a one-step solvothermal method. The results show that the organic functional group of the silane has great influence on the optical properties of DSiCDs and the number of alkoxy group in the silane has great influence on coating properties of DSiCDs. In addition, the DSiCDs prepared by (3-aminopropyl)triethoxysilane and N-[3-(Trimethoxysilyl)propyl]ethylenediamine with molar ratio of 7:3 show excellent optical properties with the maximum emission at 608 nm under 400 nm excitation. Furthermore, they can be completely dried within 1 h at room temperature to form fluorescent coating with high stability and strong adhesion to the substrate. Together with their excellent optical and coating properties, they can be directly coated on LED chips to prepare WLEDs, with a CIE coordinate of (0.33,0.31), color rendering index of 81.6, and color temperature of 5774 K.

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Evaluation of Coating Properties of Enteric-Coated Tablets Using Terahertz Pulsed Imaging

Pharmaceutical Research ◽

10.1007/s11095-014-1314-6 ◽

2014 ◽

Vol 31 (8) ◽

pp. 2140-2151 ◽

Cited By ~ 9

Author(s):

Masahiro Niwa ◽

Yasuhiro Hiraishi ◽

Katsuhide Terada

Keyword(s):

Coating Properties ◽

Terahertz Pulsed Imaging ◽

Enteric Coated

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Effect of Process Inputs on Coating Properties in the Twin-Wire Arc Zinc Process

Journal of Thermal Spray Technology ◽

10.1007/s11666-013-9949-0 ◽

2013 ◽

Vol 22 (6) ◽

pp. 856-863 ◽

Cited By ~ 7

Author(s):

Allison Lynne Johnston ◽

Aaron Christopher Hall ◽

James Francis McCloskey

Keyword(s):

Coating Properties

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Assessing Process and Coating Reliability Through Monitoring of Process and Design Relevant Coating Properties

Journal of Thermal Spray Technology ◽

10.1007/s11666-009-9467-2 ◽

2010 ◽

Vol 19 (4) ◽

pp. 695-712 ◽

Cited By ~ 48

Author(s):

Gopal Dwivedi ◽

Travis Wentz ◽

Sanjay Sampath ◽

Toshio Nakamura

Keyword(s):

Coating Properties

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UV-Curable Organic-Inorganic Hybrid Films Based on Epoxynorbornene Linseed Oils

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.217-218.294 ◽

2011 ◽

Vol 217-218 ◽

pp. 294-299

Author(s):

Jian Yun He ◽

Jin Ping Xiong ◽

Bing Qian Xia

Keyword(s):

Linseed Oil ◽

Silica Content ◽

Coating Properties ◽

Hybrid Films ◽

Nano Silica ◽

Pencil Hardness ◽

Uv Curable ◽

Inorganic Hybrid ◽

Silica Coatings ◽

Wetting Properties

Epoxynorbornene linseed oil (ENLO) is a new kind of epoxide from renewable sources. An UV-curable organic/inorganic hybrid films using epoxynorbornene linseed oils (ENLO) and surface treated nano-silica were formulated. The mechanical properties，thermal properties and coating properties of the ENLO /silica coatings were evaluated as the function of nano-silica content. The results indicated that after incorporating the nano-silica, the strength, modulus and glass transition temperature of the hybrid films enhanced, while the elongation at break decreased. The nano-silica also improved the hybrid coating properties such as pencil hardness, solvent resistance and surface wetting properties. The morphology observation of the films by atomic force microscopy (AFM) showed that the average silica particle size was ~ 70 nm and the particles were well-dispersed in the organic phase.

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