Influence of Parameters of the Short Pulse Micro-Arc Oxidation Mode on Coating Composition, Properties, and Process Performance

2021 ◽  
Vol 12 (5) ◽  
pp. 1373-1377
Author(s):  
P. I. Butyagin ◽  
S. S. Arbuzova
Keyword(s):  
Short Pulse ◽  
Process Performance ◽  
Coating Composition ◽  
Micro Arc Oxidation ◽  
Composition Properties

Effect of microarc oxidation by short-pulse mode parameters on composition, coating properties and process productivity

2021 ◽  
Vol 5 ◽  
pp. 82-88
Author(s):  
P. I. Butyagin ◽  
Keyword(s):  
Pulse Duration ◽  
Crystalline Phase ◽  
Short Pulse ◽  
Formation Rate ◽  
Microarc Oxidation ◽  
Pulse Mode ◽  
Coating Properties ◽  
Composition Properties ◽  
Oxidation Parameters ◽  
Process Productivity

This article presents the results of study of the influence of microarc oxidation parameters — ferquency and pulse duration — on the composition, properties of the coating, and also on the productivity of the microarc oxidation (MAO) process. It was found that the frequency in the range from 100 to 500 Hz significantly increases the formation rate of the MAO coating. A change in the composition and properties of the MAO coatings at pulse durations from 50 to 200 μs is observed. Starting with a pulse duration of 50 μs and a frequency of 400 Hz, the γ-Al2O3 crystalline phase is detected in the coating, the elemental composition, morphology, and microhardness of the coating change significantly.

scholarly journals INFLUENCE OF ELECTRICAL PARAMETERS ON THE ROUGHNESS OF THE COATING OBTAINED IN A SHORT-PULSE MODE OF MICRO-ARC OXIDATION

2021 ◽  
pp. 29-33
Author(s):  
Pavel I. Butyagin ◽  
Keyword(s):  
Pulse Duration ◽  
Short Pulse ◽  
Pulse Repetition Frequency ◽  
Microarc Oxidation ◽  
Pulse Mode ◽  
Electrical Parameters ◽  
Wide Range ◽  
Micro Arc Oxidation ◽  
Electric Parameters ◽  
The Moment

In the course of the work it was shown that in the process of short-pulse microarc oxidation, it is possible to control electric parameters – pulse duration and pulse repetition frequency – in a wide range of 12–200 μs and 100–500 Hz, by controlling the porosity and the nature of the surface melting of the MAO coating. As a result, it becomes possible to obtain coating with the required roughness. At the maximum values of the pulse duration and frequency (200 μs and 500 Hz) at the moment of the microplasma discharge, the maximum amount of energy is released, which allows uniformly, with the smallest amount of first irregularities, to melt the coating surface, to obtain round pores of stable size. All that factors favour a decrease in the surface roughness of the MAO coating

Rheological characterization of tack and viscoelasticity of compositions of crepe coating used in the Yankee dryer

TAPPI Journal ◽  
2019 ◽  
Vol 18 (11) ◽  
pp. 641-649
Author(s):  
JOSHUA OMAMBALA ◽  
CARL MCINTYRE
Keyword(s):  
Normal Force ◽  
Weight Ratio ◽  
Good Combination ◽  
Rheological Characterization ◽  
Nonlinear Viscoelastic ◽  
Coating Composition ◽  
Linear And Nonlinear ◽  
Work Done ◽  
Tissue Production

The vast majority of tissue production uses creping to achieve the required set of properties on the base sheet. The Yankee coating helps to develop the desired crepe that in turn determines properties such as bulk and softness. The adhesion of the sheet to the Yankee surface is a very important characteristic to consider in achieving the desired crepe. The coating mix usually consists of the adhesive, modifier, and release. A good combination of these components is essential to achieving the desired properties of the tissue or towel, which often are determined by trials on the machine that can be time consuming and lead to costly rejects. In this paper, five compositions of an industrial Yankee coating adhesive, modifier, and release were examined rheologically. The weight ratio of the adhesive was kept constant at 30% in all five compositions and the modifier and release ratios were varied. The normal force and work done by the different compositions have been shown at various temperatures simulating that of the Yankee surface, and the oscillatory test was carried out to explain the linear and nonlinear viscoelastic characteristic of the optimal coating composition.

Multiphoton ionization by a very short pulse

2017 ◽  
Vol 187 (11) ◽  
pp. 1280-1287 ◽  
Author(s):  
Leonid V. Keldysh
Keyword(s):  
Short Pulse ◽  
Multiphoton Ionization
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