NDLI: Effects of Spray Parameters and Heat Treatment on the Microstructure and Mechanical Properties of Titanium Coatings Formed by Warm Spraying

Content Provider	Springer Nature Link
Author	Molak, R. M. Araki, H. Watanabe, M. Katada, H. Oh, N. Kuroda, S.
Copyright Year	2015
Abstract	The microstructure and mechanical properties of Ti coatings deposited by warm spraying were investigated with the aim to find a set of optimum parameters for the spray process as well as for the subsequent heat treatment. Titanium powder was deposited with different nitrogen flow rates in a range from 0.5 to 1.5 m$^{3}$/min. It was shown that spray parameters, which affect the temperature and velocity of in-flight particles, have significant influence on the fabricated coatings properties. Especially the increase of the warm spraying combustion pressure from 1 to 4 MPa resulted in an increase in the particle velocity to above 1100 m/s. This modification significantly increased the density and was beneficial for controlling the oxygen level in Ti coatings. Miniature tensile specimens with a total length of 9 mm were used to perform tensile tests for the Ti deposits. The optimal mechanical properties were achieved for specimens formed at a middle range of nitrogen flow rate (0.75 m$^{3}$/min). Subsequently, several heat treatments were performed in order to enhance the mechanical properties of the as-sprayed coatings. It was found that the post-spray heat treatment significantly enhanced the strength and elongation of the Ti deposits determined by miniature specimen tensile test.
Starting Page	1459
Ending Page	1479
Page Count	21
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	24
Issue Number	8
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2015-11-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	mechanical properties microstructure miniature specimen porosity warm spraying Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings Characterization and Evaluation of Materials Operating Procedures, Materials Treatment Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Materials Chemistry Condensed Matter Physics

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