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Author Zhang, Yongang ♦ Hyland, Margaret ♦ Tran, Anh Tuyet ♦ Matthews, Steven
Source SpringerLink
Content type Text
Publisher Springer US
File Format PDF
Copyright Year ©2015
Language English
Subject Domain (in DDC) Technology ♦ Engineering & allied operations
Subject Keyword active elements ♦ plasma spray ♦ splat morphology ♦ spreading behavior ♦ transition temperature ♦ Surfaces and Interfaces, Thin Films ♦ Tribology, Corrosion and Coatings ♦ Characterization and Evaluation of Materials ♦ Operating Procedures, Materials Treatment ♦ Analytical Chemistry
Abstract In the formation of plasma-sprayed splats, the spreading behavior of molten droplets is essential for forming desirable lamella with good adhesion to the substrate. To understand the effect of the active element chromium on droplet spreading, pure Ni and Ni-20 wt.% (Ni20Cr) alloyed powders were plasma sprayed on mirror-polished 304 stainless steel substrates heated to different temperatures (below 200 °C). The substrate heating resulted in very little change in the surface roughness. However, there was a measureable change in the surface chemistry of the outermost few nanometers, which became increasingly enriched in Fe at higher temperatures. The splat morphologies were characterized and the transition temperatures were estimated. The results show that the transition from splashed to disk splats was not solely dependent on the temperature of the substrate. In some cases, some splashing still occurred to a measureable extent even at relatively high substrate temperatures, even above temperatures at which adsorbates (moisture) were totally removed from the surface. The splashing behavior could be correlated to a combination of the change in the surface chemistry of the substrate and the presence of active elements in the coating materials.
ISSN 10599630
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-07-15
Publisher Place New York
e-ISSN 15441016
Journal Journal of Thermal Spray Technology
Volume Number 25
Issue Number 1-2
Page Count 11
Starting Page 71
Ending Page 81


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Source: SpringerLink