Novel suspension route to incorporate graphene nano-platelets in HVAF-sprayed Cr3C2eNiCr coatings for superior wear performance
Artikel i vetenskaplig tidskrift, 2021

Graphene nano platelets (GNP) have several attractive properties, including excellent lubricity
that can be used to develop wear-resistant coatings. Thermally sprayed chromium
carbideenickel chromium (Cr3C2eNiCr) coatings are widely employed to impart wear
resistance to engineering components. This work attempts to improve the wear resistance
of high velocity air fuel (HVAF) sprayed Cr3C2eNiCr coatings by incorporating GNP using a
hybrid approach in which Cr3C2eNiCr (powder) and GNP (suspension) are co-axially
injected. Two different powder-to-suspension delivery ratios were employed in this
study that utilizes a liquid feedstock in tandem with a HVAF system. Furthermore, for
comparison, a pure (without graphene) Cr3C2eNiCr reference coating was deposited by the
HVAF process using identical spray parameters. The as-sprayed coatings were characterized
for their microstructure and phase constitution by SEM/EDS and X-Ray Diffraction.
Mechanical properties such as hardness and fracture toughness were evaluated using
micro-indentation technique. The hybrid coatings were subjected to dry sliding wear tests
and wear performance was compared with reference Cr3C2eNiCr. The GNP incorporated
hybrid coatings exhibited lower CoF and lower wear rates than the reference Cr3C2eNiCr
coating. Post wear SEM/EDS analysis revealed different wear mechanisms predominant in
the investigated coatings. Utilizing the above as a case study, this work provides key insights
into a new approach to produce GNP incorporated coatings for mitigating wear.

Cr3C2-NiCr

Graphene nano-platelets (GNP)

Powder-suspension hybrid

High velocity air fuel (HVAF)

Sliding wear

Författare

Satyapal Mahade

Högskolan Väst

Antonio Mulone

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Stefan Bjorklund

Högskolan Väst

Uta Klement

Chalmers, Industri- och materialvetenskap, Material och tillverkning

Shrikant Joshi

Högskolan Väst

Journal of Materials Research and Technology

2238-7854 (eISSN)

13 498-512

Deponering av grafenhaltiga beläggningar på stora ytor för olika funktionella tillämpningar

VINNOVA, 2018-12-01 -- 2020-12-31.

VINNOVA, 2018-12-01 -- 2020-12-31.

Drivkrafter

Hållbar utveckling

Ämneskategorier

Tribologi

Materialteknik

Bearbetnings-, yt- och fogningsteknik

Styrkeområden

Produktion

Materialvetenskap

Infrastruktur

Chalmers materialanalyslaboratorium

DOI

10.1016/j.jmrt.2021.04.096

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Senast uppdaterat

2021-05-19