Ultrasonic technique for measuring porosity of plasma-sprayed alumina coatings

1997 ◽  
Vol 6 (4) ◽  
pp. 486-488 ◽  
Author(s):  
S. Parthasarathi ◽  
B. R. Tittmann ◽  
E. J. Onesto
Keyword(s):  
Ultrasonic Technique ◽  
Alumina Coatings ◽  
Plasma Sprayed

Use of Different Process Gases for Manufacturing Isolating Alumina Coatings by Flame Spraying with Cords

2021 ◽  
Author(s):  
M. Hauer ◽  
M. Meyer ◽  
D. Billieres ◽  
C. Bricquet ◽  
F. Gerstgrasser ◽  
...  
Keyword(s):  
Volume Resistivity ◽  
Alpha Phase ◽  
Flame Spraying ◽  
Flame Spray ◽  
Alumina Coatings ◽  
Spray Coatings ◽  
Aluminum Hydroxides ◽  
Fine Microstructure ◽  
Plasma Sprayed ◽  
Aluminum Substrates

Abstract This study assesses the quality of flame-sprayed alumina coatings produced from recently developed alumina cord using argon and compressed air as atomizing gases. Coatings of different thicknesses were deposited on aluminum substrates and then analyzed using optical microscopy, X-ray diffraction, and resistivity measurements. The coatings, particularly those sprayed with argon, had fine microstructure and higher surface and volume resistivity than flame-spray coatings made from alumina cord in the past. They were also found to have higher alpha phase content than plasma-sprayed coatings, regardless of the atomizing gas used. The effect of humidity and the possible formation of aluminum hydroxides are also addressed.

A Definition of the Topography of Grit-Blasted Surfaces for Plasma Sprayed Alumina Coatings

1999 ◽  
Vol 121 (1) ◽  
pp. 49-53 ◽  
Author(s):  
B. J. Griffiths ◽  
D. T. Gawne ◽  
G. Dong
Keyword(s):  
Surface Topography ◽  
Raw Material ◽  
Height Distribution ◽  
Alumina Coatings ◽  
Definition Of ◽  
The Individual ◽  
Plasma Sprayed ◽  
Individual Particles

This paper describes the topographical implications of grit blasted surfaces on plasma sprayed alumina. The transition of the grit blasted surface from raw material to correctly blasted is described in terms of surface heights, height distribution, spacings and texture. The influence of embedded grit is shown to be significant. The individual particles of alumina impacting the surface are classified into two types, these being disc splats and splash splats. Their deposition relationships with regard to surface topography and adhesion is explained with reference to the two types of splat.

scholarly journals Enhancement of scattering and reflectance properties of plasma-sprayed alumina coatings by controlling the porosity

2013 ◽  
Vol 220 ◽  
pp. 80-84 ◽  
Author(s):  
J. Marthe ◽  
E. Meillot ◽  
G. Jeandel ◽  
F. Enguehard ◽  
J. Ilavsky
Keyword(s):  
Alumina Coatings ◽  
Plasma Sprayed

The fracture toughness of alumina coatings plasma-sprayed at different in situ temperatures

2012 ◽  
Vol 38 (6) ◽  
pp. 4661-4667 ◽  
Author(s):  
Ya-Zhe Xing ◽  
Qiu-Lan Wei ◽  
Jian-Min Hao
Keyword(s):  
Fracture Toughness ◽  
Alumina Coatings ◽  
Plasma Sprayed

Relationship between Splat Morphology and Property of Plasma Sprayed Alumina Coatings

2004 ◽  
Vol 449-452 ◽  
pp. 925-928 ◽  
Author(s):  
Sachio Oki
Keyword(s):  
Surface Morphology ◽  
Splat Morphology ◽  
Alumina Coatings ◽  
Spray Pattern ◽  
Coating Property ◽  
Microscope Images ◽  
Plasma Sprayed ◽  
The Relationship ◽  
Scanning Electron

New method for characterization of coating microstructures and for evaluation of coating property by means of surface morphology has been proposed. In this paper, the distribution of shape and dimensions of splat was examined using quantitative analysis of scanning electron microscope images from the surface of spray pattern as well as the surface of coating. Results obtained in this study indicate that it is necessary to analyze the spray pattern as well as the surface morphology in order to estimate the coating property by means of the distribution of splat which composes the coating. Moreover, the splats, which are in the interface between the substrate and the coating, should have the same morphology as those of the coating surface. The relationship between splat morphology and the property of coatings was discussed.

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