NDLI: Effects of the Modification of Processing Parameters on Mechanical Properties of HVOF Cr$_{2}$C$

Content Provider	Springer Nature Link
Author	López Báez, Israel Pobla Salas, Carlos Agustín Muñoz Saldaña, Juan Trápaga Martínez, Luís Gerardo
Copyright Year	2015
Abstract	The present work shows that some mechanical properties of Cr$_{2}$C$_{3}$-25NiCr coatings processed by HVOF thermal spraying such as elastic modulus, hardness, fracture toughness, and wear resistance are closely linked to selected processing parameters as well as to chemistry, structure, and morphology of the feedstock material. Optimization of processing parameters was based on oxygen concentration measurements inside the flame, studied by a contour plot, and curvature data recorded during spraying. The increase in velocity of in-flight particles strongly affected the interfacial fracture toughness of the coatings, as a maximum K $_{IC}$ of 3.71 MPa m$^{1/2}$ was reached when particle velocity increased to ~765 m/s. The micro-hardness of Cr$_{2}$C$_{3}$-25NiCr coatings was widely varied by changing the HVOF spray conditions, i.e., the amount of reinforcing phases and inter-splat adhesion were quite sensitive to any modification of the processing parameters. It was also found that coatings having a high inter-splat adhesion and/or low degradation of reinforcing hard phases showed reduced weight loss during erosive wear tests. Finally, from the experimental evidence reported in this work, a correlation between the elastic bending modulus of coatings and indentation crack length was also found.
Starting Page	938
Ending Page	946
Page Count	9
File Format	PDF
ISSN	10599630
Journal	Journal of Thermal Spray Technology
Volume Number	24
Issue Number	6
e-ISSN	15441016
Language	English
Publisher	Springer US
Publisher Date	2015-06-02
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	feedstock HVOF flame interfacial fracture toughness particle velocity structural integrity 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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