Showing 5 results for Vof
N. Hatami,, R. Babaei, P. Davami,
Volume 5, Issue 2 (6-2008)
Abstract
Abstract: In this study an algorithm for mold-filling simulation with consideration of surface
tension has been developed based on a SOLA VOF scheme. As the governing equations, the
Navier-Stokes equations for incompressible and laminar flows were used. We proposed a way of
considering surface tension in mold-filling simulation. The proposed scheme for surface tension
was based on the continuum surface force (CSF) model we could confirm the remarkable
effectiveness of the surface tension by experiment which concluded in very positive outcome.
J. Saaedi, H. Arabi, Sh. Mirdamadi, Th. W. Coyle,
Volume 5, Issue 4 (12-2008)
Abstract
Abstract: Two different coating microstructures of Ni-50Cr alloy were obtained on a stainless steel substrate by
changing combustion characteristics of a high velocity oxy-fuel (HVOF) process and the size distribution of feed
powder during coating process. Use of the finer feed powder and leaner fuel in oxygen/fuel ratio (i.e. using a ratio
much less than stoichiometric ratio) led to formation of an extremely dense coating with high oxide content. Heat
treating of this coating at 650ºC for 4 hours caused the formation of an intermetallic sigma phase having Cr7Ni3
stoichiometry. Formation of this phase has been reported occasionally in thin films not in thermal spray coatings, as
reported for the first time in this research. In addition no sigma phase was detected in the HVOF as-deposited coating
with low oxide content after heat treatment of the samples. Therefore, due to the limited number of papers available in
the subject of formation of phase in either Ni-Cr bulk alloys or coatings, it is considered appropriate to show up a
case in this field. In this work, the formation of sigma phase in Ni-50Cr coating deposited by HVOF technique and
heat treated at 650ºC was discussed and then the coating was characterized.
Jashanpreet Singh, Rana Gill, Satish Kumar, S.k. Mohapatra,
Volume 19, Issue 4 (12-2022)
Abstract
In this paper, an investigation was carried out to test the suitability of potential additive materials in
WOKA 3533 (WC-10Co4Cr) cermet HVOF coating subjected to slurry erosion in ash conditions. The additives
namely molybdenum carbide, yttrium oxide, and zirconium oxide were added in equal percentages (3 wt.%) in
WOKA cermet powder. High-velocity oxy-fuel (HVOF) spraying was performed to develop the additive-based
WOKA cermet coatings. The slurry erosion in ash conditions was tested using the pot tester. Microstructural and
mechanical properties of traditional and additive-based WOKA cermet coatings were also tested in the present
study; for example, microstructure, crystalline phases of as-sprayed coatings, and microhardness. Results present a
comparison of surface erosion wear of different cermet coatings. It was found that the yttrium oxide was a suitable
additive for the WOKA cermet coatings than the molybdenum carbide. However, zirconium oxide is unsuitable for
WOKA cermet coatings in erosion wear applications.
