Abstracts Book - IMRC 2018

• SE4-O009
EFFECT OF VC POWDERS ON THE MECHANICAL PROPERTIES OF
THERMAL SPRAY COATINGS APPLIED BY HVOF
José Ángel Cabral Miramontes 1 , Julio César Valladares Hernández 1 , Pedro Samaniego Gamez 1 ,
Citlalli Gaona 1 , Patricia del Carmen Zambrano Robledo 1 , Carlos Agustin Poblano Salas 2 ,
Facundo Almeraya 1
1 Universidad Autónoma de Nuevo León, Facultad de Ingeniería Mecánica y Eléctrica, Mexico.
2 CIATEQ, Materiales Avanzados, Mexico.
High velocity oxi-fuel (HVOF) thermal spray process allows to develope ceramicmetallic
coatings, which combine the high temperature resistance and abrasion of
ceramics with the malleability of metals. Hard chromium is used in the aeronautical
industry to coat different types of components of the landing gear given their wear
and corrosion properties. However, over the last decade there has been concerns
about chromates due to environmental, health and safety considerations related to
the handling, storage and disposal of hard chromium (Cr 6+ ). Due to this
requirement, WC-17 Co bimodal coatings applied by thermal spraying are
alternatives to hard chromium coatings applied on landing gears for their wear
resistance, corrosion resistance and lower environmental impact. Bimodal coatings
of WC-Co nanostructured and microstructured powder were made at different
concentrations with VC additions on AISI 304 stainless steel plates with a HVOF
Sulzer Metco DJH2700 hybrid gun. The samples were characterized by energy
dispersive spectrometry, scanning electron microscopy, hardness and wear.
To evaluate the coatings a central composite experimental design was used to study
the effect vanadium carbide content and nanostructured particles concentration on
the hardness, coefficient of friction and wear rate of WC-17Co-VC bimodal coatings.
The additions of 5 % of vanadium carbide with 50% of nanostructured particles in
the coatings, allowed to reduce the friction coefficient up to 27% compared with the
coating without VC additions and nor nanostructured particles, so it was shown that
the refinement of the microstructure to the nanometric dimensions and the
additions of VC favorably influence the wear resistance. The statistical analysis of
the experimental matrix allowed to establish the concentration of 1.36% of VC and
50% of nanostructured particles to obtain coatings with the desired mechanical
properties.
Keywords: Thermal spray, nanosetructured, coatings
Presenting authors email: oli_94@outlook.com