scholarly journals Analysis of Al2O3 Nanostructure Using Scanning Microscopy

Scanning ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Marek Kubica ◽  
Władysław Skoneczny ◽  
Marek Bara
Keyword(s):  
Computer Analysis ◽  
Coating Layer ◽  
Oxide Coating ◽  
Ceramic Layer ◽  
Scanning Microscope ◽  
Binary Images ◽  
Hard Anodizing ◽  
Different Shapes ◽  
Main Factors ◽  
Electrolyte Aqueous Solution

It has been reported that the size and shape of the pores depend on the structure of the base metal, the type of electrolyte, and the conditions of the anodizing process. The paper presents thin Al2O3 oxide layer formed under hard anodizing conditions on a plate made of EN AW-5251 aluminum alloy. The oxidation of the ceramic layer was carried out for 40–80 minutes in a three-component SAS electrolyte (aqueous solution of acids: sulphuric 33 ml/l, adipic 67 g/l, and oxalic 30 g/l) at a temperature of 293–313 K, and the current density was 200–400 A/m2. Presented images were taken by a scanning microscope. A computer analysis of the binary images of layers showed different shapes of pores. The structure of ceramic Al2O3 layers is one of the main factors determining mechanical properties. The resistance to wear of specimen-oxide coating layer depends on porosity, morphology, and roughness of the ceramic layer surface. A 3D oxide coating model, based on the computer analysis of images from a scanning electron microscope (Philips XL 30 ESEM/EDAX), was proposed.

Investigation of the SHS Process Initiation in Base Mixture during HFC-Heating and the Combustion Rate Dependence on Various Factors

2021 ◽  
Vol 1031 ◽  
pp. 67-74
Author(s):  
Alexey V. Ishkov ◽  
Vladimir N. Malikov ◽  
Alexander Shegolev
Keyword(s):  
Combustion Rate ◽  
Coating Layer ◽  
Thin Layers ◽  
Powder Materials ◽  
Charge Composition ◽  
Powder Mixtures ◽  
Factors Influencing ◽  
Main Factors ◽  
Ignition And Combustion ◽  
Coating Layer Thickness

The paper describes the researches of the SHS process initiation in samples of powder mixtures of reagents intended for steel parts hardening with an excess of Al or B2O3 by a heat source. Mixtures of reagents with different weight ratios of components were used as samples. Thereat, the initiation of SHS process in thin layers was conducted with a coating layer thickness of no more than 6 mm for all tested compositions. The dependences of the combustion rate on various factors including particle size of powder materials and charge composition have been obtained. The main factors influencing the dependences of initiation (ignition) and combustion rate are established, and the degree of influence of these factors on the dependences is estimated. The obtained results made it possible to correct the composition of the base mixture reasonably in order to achieve the required combustion rate.

Diffusion of oxygen in the scales of Fe–Cr alloy interconnects and oxide coating layer for solid oxide fuel cells

2008 ◽  
Vol 179 (38) ◽  
pp. 2216-2221 ◽  
Author(s):  
T HORITA ◽  
H KISHIMOTO ◽  
K YAMAJI ◽  
Y XIONG ◽  
M BRITO ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Coating Layer ◽  
Oxide Coating ◽  
Solid Oxide ◽  
Oxide Fuel

Atomic Structure of Hydrous Ruthenium Oxide Coating on Ti and CNT Substrate by Cathodic Deposition Method

2009 ◽  
Vol 79-82 ◽  
pp. 895-898
Author(s):  
H.S. Huang ◽  
W.Z. Peng ◽  
Yu Li Lin
Keyword(s):  
Coating Layer ◽  
Ruthenium Oxide ◽  
Nanocrystalline Structure ◽  
Oxide Coating ◽  
High Resolution Electron Microscopy ◽  
The Other ◽  
Deposition Method ◽  
Cathodic Deposition ◽  
Resolution Electron ◽  
Charge Discharge

In this study, hydrous ruthenium oxide was deposited on titanium(Ti) and carbon nanotube(CNT) substrate by cathodic deposition method. Combination of amorphous and nanocrystalline structure of hydrous ruthenium oxide was investigated by high resolution electron microscopy. The measured capacitance was found keeping nearly constant through charge/discharge processes for hydrous ruthenium oxide coating on Ti substrate. On the other hand, thin and uniform layer of hydrous ruthenium oxide coating can be deposited on CNT substrate. The thickness of the coating layer was found less than 10nm. Combination of amorphous and nanocrystalline structure of hydrous ruthenium oxide was also investigated on this specimen. The consumption of coating was found very effective for this specimen after 105 charge/discharge cycles which lead to the tremedenously decreasing in the measured capacitance.

Preparation of Fluorine Doped Zinc Tin Oxide Coating Layer on SUS 316 Bipolar Plates by ECR-MOCVD for PEMFC

2019 ◽  
Vol 25 (1) ◽  
pp. 1731-1734 ◽  
Author(s):  
Joong-Kee Lee ◽  
Ji Hun Park ◽  
Wonyoung Chang ◽  
Dongjin Byun
Keyword(s):  
Tin Oxide ◽  
Coating Layer ◽  
Oxide Coating ◽  
Bipolar Plates ◽  
Zinc Tin Oxide

Nano cellulose fibers and graphene oxide coating on polyolefin separator with uniform Li+ transportation channels for long-life and high-safety Li metal battery

2020 ◽  
pp. 1-25
Author(s):  
Dongmei Dai ◽  
Yixuan Chen ◽  
Boran Chen ◽  
Jinxu Qiu ◽  
Bao Li ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrochemical Impedance ◽  
Coating Layer ◽  
Cellulose Fiber ◽  
Oxide Coating ◽  
Thermal Shrinkage ◽  
Retention Capacity ◽  
Nano Cellulose ◽  
Long Life ◽  
Lithium Dendrite

Abstract Lithium anode could greatly increase the energy density of the cell, but inevitable lithium dendrites hinder its application. A powerful coating layer can effectively suppress the growth of dendrite by promoting a fast and uniform Li+ flux. Here a polyolefin separator coated with a layer of nano cellulose fiber (NCF) and graphene oxide (GO) is designed to restrain the growth of Li-dendrite and accommodate thermal shrinkage resistance. The results of electrochemical impedance spectroscopy showed that the NCF/GO coating with a mass ratio of 3:5 showed the highest value of ionic conductivity. The Li/separator/Li symmetrical battery with NCF/GO coated separator can work for 65 hours during continuous charging before the voltage dropping down to zero, which is about 40% longer than the battery with bare polyolefin separator. In addition, the NCF/GO coating layer can also increase the retention capacity ratio of a cell by more than 10% in the 100 charge/discharge cycles. In this paper, the as-prepared NCF/GO coating separator provides a reference for designing a long-life and safety battery with Li-anode by effectively inhibiting the lithium dendrite.

Highly Stable and Sensitive Gas Sensor Based on Single-Walled Carbon Nanotubes Protected by Metal-Oxide Coating Layer

2009 ◽  
Vol 2 (9) ◽  
pp. 095008 ◽  
Author(s):  
Winadda Wongwiriyapan ◽  
Satoshi Inoue ◽  
Yusuke Okabayashi ◽  
Tatsuya Ito ◽  
Ryotaro Shimazaki ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Oxide ◽  
Gas Sensor ◽  
Coating Layer ◽  
Oxide Coating ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes ◽  
Metal Oxide Coating

scholarly journals Smoothing the Surface and Improving the Electrochemical Properties of NaxMnO2 by a Wet Chemical Method

Nanomaterials ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 246
Author(s):  
Siliang Zhao ◽  
Zhiping Lin ◽  
Fugen Wu ◽  
Feng Xiao ◽  
Jiantie Xu
Keyword(s):  
Electrochemical Performance ◽  
Chemical Method ◽  
Coating Layer ◽  
Specific Capacity ◽  
Oxide Coating ◽  
Electrochemical Measurement ◽  
Wet Chemical Method ◽  
Internal Impedance ◽  
Wet Chemical ◽  
Better Than

NaxMnO2 (NMO) is treated by a wet chemical method in this paper. The treated NMO can form a copper oxide coating layer, and some of the coating layer can be peeled off, smoothing the surface of particles. Electrochemical measurement shows that treated NMO can maintain 72.6% of its specific capacity after 300 cycles, which is better than the 58.7% specific capacity of untreated NMO materials. Additionally, the ratio of capacity remaining rate can be improved from an initial 87% to 99.5%. So, this wet chemical method is available to smooth the electrode surface and reduce the internal impedance, and thus to effectively improve electrochemical performance during the battery cycle.

Mechanisms of Degradation and Failure in a Plasma-Deposited Thermal Barrier Coating

1990 ◽  
Vol 112 (4) ◽  
pp. 521-526 ◽  
Author(s):  
J. T. DeMasi-Marcin ◽  
K. D. Sheffler ◽  
S. Bose
Keyword(s):  
Thermal Barrier Coating ◽  
Damage Accumulation ◽  
Ceramic Coating ◽  
Coating Layer ◽  
Thermal Exposure ◽  
Ceramic Layer ◽  
Constitutive Behavior ◽  
Thermal Barrier ◽  
Accumulation Process ◽  
Barrier Coating

Failure of a two-layer plasma-deposited thermal barrier coating is caused by cyclic thermal exposure and occurs by spallation of the outer ceramic layer. Spallation life is quantitatively predictable, based on the severity of cyclic thermal exposure. This paper describes and attempts to explain unusual constitutive behavior observed in the insulative ceramic coating layer, and presents details of the ceramic cracking damage accumulation process, which is responsible for spallation failure. Comments also are offered to rationalize the previously documented influence of interfacial oxidation on ceramic damage accumulation and spallation life.

Evaluation Flame Retardancy of Epoxy Composite by Using Design of Experiments

2012 ◽  
Vol 186 ◽  
pp. 156-160 ◽  
Author(s):  
Ali I. Al-Mosawi ◽  
Jaheel K. Ahmed ◽  
Haydar A. Hussain
Keyword(s):  
Flame Retardant ◽  
Flame Retardancy ◽  
Coating Layer ◽  
Epoxy Composite ◽  
Polymeric Composite ◽  
Flame Resistance ◽  
Percentage Contribution ◽  
Exposure Interval ◽  
Main Factors ◽  
Antimony Tetroxide

The present research aimed to study the possibility to increasing flame retardancy of polymeric composite materials reinforced by fibers by coating by a flame retardant layer represent antimony tetroxide (Sb4O6) as a coating layer (4mm) thickness to react and prevent spread of flame on surface of composite material consist of epoxy resin reinforced by Kevlar fibers and exposed this coating layer to oxyacetylene flame with different exposure intervals (10,15,20mm) and study the range of resistance of flame retardant material layer to the flames and protected the substrate .The experimental results show that a great increment in thermal resistance and flame retardancy after coating by tetroxide as well as rising flame resistance increased exposure distances to flame . Determination the percentage contribution effects of main factors were time , exposure interval ,and noise variables (error) to the variability of the surface temperature at significant level (α=0.05) .Results show that the percentage of main factors were :time=63.15% , exposure interval=14.81% and noise variables=22.04%.

scholarly journals Mechanisms of Degradation and Failure in a Plasma Deposited Thermal Barrier Coating

1989 ◽  
Author(s):  
Jeanine T. Demasi-Marcin ◽  
Keith D. Sheffler ◽  
Sudhangshu Bose
Keyword(s):  
Thermal Barrier Coating ◽  
Damage Accumulation ◽  
Ceramic Coating ◽  
Coating Layer ◽  
Thermal Exposure ◽  
Ceramic Layer ◽  
Constitutive Behavior ◽  
Thermal Barrier ◽  
Accumulation Process ◽  
Barrier Coating

Failure of a two layer plasma deposited thermal barrier coating is caused by cyclic thermal exposure and occurs by spallation of the outer ceramic layer. Spallation life is quantitatively predictable, based on the severity of cyclic thermal exposure. This paper describes and attempts to explain unusual constitutive behavior observed in the insulative ceramic coating layer, and presents details of the ceramic cracking damage accumulation process which is responsible for spallation failure. Comments also are offered to rationalize the previously documented influence of interfacial oxidation on ceramic damage accumulation and spallation life.

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