Journal article
Functionally graded WC–Co/NiAl HVOF coatings for damage tolerance, wear and corrosion protection
Surface & coatings technology, v 206(8), pp 2585-2601
15 Jan 2012
Abstract
The manufacturing of a HVOF-sprayed functionally graded coating (FGC), consisting of two NiAl/WC–Co composite layers with increasing cermet content and a pure WC–Co topmost layer, is discussed in this paper. As the stress build-up during spraying, measured via curvature method, is reduced in the NiAl-rich layers, thick coatings can be deposited with lower risk of delamination, in comparison to a pure WC–Co thick layer. Thermal stresses within the layers and the stainless steel substrate, measured from low temperature thermal cycling tests, are also reduced. The mechanical behaviour of the top layer in the graded structure at relatively low loads (i.e. pin-on-disk) is equivalent to the same layer without gradation, whereas at high loads (i.e. ball-drop impact test) the enhanced compliance with depth increases the load bearing capability of the graded structure. Electrochemical corrosion tests demonstrate no significant interconnected porosity and therefore, no interaction of the graded layers with the topmost WC–Co layer. The deterioration of the deeper layers under wear and corrosive conditions are also tested to investigate their performance in the scenario that the top layer coating wears out exposing the deeper layers to the surface.
► NiAl/WC–Co functionally graded coatings (FGC) manufactured by HVOF spraying. ► Lower stress discontinuity than pure WC–Co at the coating/substrate interface. ► Damage tolerance conferred by compressive stresses in underlying coating layers. ► Better cyclic impact resistance than pure WC–Co layers (reduced cracking). ► The FGC coating is dense and free from significant interconnected porosity.
Metrics
Details
- Title
- Functionally graded WC–Co/NiAl HVOF coatings for damage tolerance, wear and corrosion protection
- Creators
- Giovanni Bolelli - University of Modena and Reggio EmiliaValeria Cannillo - University of Modena and Reggio EmiliaLuca Lusvarghi - University of Modena and Reggio EmiliaRoberto Rosa - University of Modena and Reggio EmiliaAlfredo Valarezo - Stony Brook UniversityWanhuk B. Choi - Stony Brook UniversityRavi Dey - Stony Brook UniversityChristopher Weyant - Stony Brook UniversitySanjay Sampath - Stony Brook University
- Publication Details
- Surface & coatings technology, v 206(8), pp 2585-2601
- Publisher
- Elsevier
- Number of pages
- 17
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000300458500073
- Scopus ID
- 2-s2.0-84855283121
- Other Identifier
- 991021960799604721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Coatings & Films
- Physics, Applied