4 results listed
In this research, adhesive wear behavior of FeCr slag coating in water environment was investigated. FeCr slag coatings, deposited onto AISI 420 stainless steel specimens with atmospheric plasma spray (APS) method, were subjected to adhesive wear tests in aqueous environment using a pin-on-disk tribometer. 7N load, 0,08 m/s sliding speed and 538 m sliding distance were used as sliding wear test parameters. In addition to the SEM analyses of the worn samples, friction coefficient graphs and 3D profilometer measurements were used to evaluate the wear performance of FeCr slag coatings in water
environment. Surface wear micrographs of the FeCr slag coating worn under aqueous conditions indicate that, friction induced tribological layer formation is reduced as compared to dry sliding wear test results, and resulting surface cracks led to local spallations. Also, friction coefficient under aqueous conditions was found to be three times lower than the average friction
coefficient obtained under dry conditions.
International Conference of Advanced Materials and Manufacturing Technologies
ICAMT
Y. Kucuk
Mustafa Sabri Gök
Mecit Oge
In this study, a comparative examination of the effect of sliding speed, as a ball-on-disc sliding wear test parameter,
was investigated under aqueous conditions. For this purpose, AISI 420 stainless steel specimens were prepared in cylindrical
form (Ø25x8 mm), then they were coated with commercially available ceramic coatings (Cr2O3 and Al2O3) using APS
technique. Adhesive wear tests were carried out by the use of a ball-on-disc testing rig. The tests were performed under 7N
load, 0.08 m/s and 0.12 m/s sliding speeds. After the wear tests, worn samples were subjected to SEM analysis and profilometer
measurements. The effect of sliding speed on wear performance of ceramic coatings was evaluated based on the analysis and
measurement results. SEM images of Al2O3 coating indicate that, increasing sliding speed also increased the effect of plastic
deformation, further inducing tribological layer formation. SEM images of Cr2O3 coating surface, on the other hand, indicated
no significant effect of sliding speed at macro or micro level, which is mainly attributed to the higher hardness of Cr2O3
coating than Al2O3 coating. Friction coefficient graphs of both coatings indicated no significant change at both sliding speeds.
International Conference of Advanced Materials and Manufacturing Technologies
ICAMT
Mustafa Sabri Gök
Y. Kucuk
Mecit Oge
In this research Al2O3 (Metco 130SF) powder was deposited on AISI 420 stainless streel substrates using
Atmosperic Plasma Spray (APS) technique. Wear tests were performed on a ball-on-disc wear testing rig (Turkyus brand) to
evaluate the dry and aqueous adhesive wear behaviors of the obtained coatings. Test parameters were specified as 7N load and
0.08 m/s sliding speed. The SEM micrographs of the wear track surface and friction coefficients were used in the analysis of the
coating’s wear behavior. Additionally, volumetric mass loss calculations were conducted using a 3D optical profilometer.
Friction coefficients were respectively found as 0.7 and 0.35 for dry and aqueous conditions, indicating a nearly 50% reduction
in the latter case. The decline in worn volume values was also in proportion with the decline in friction coefficient. The
comparison of dry and aqueous environment SEM micrographs show that, tribological layer formation occurred at a reduced
level in water, which is attributed to the increase in local heat transfer. Also, surface cracks are more apparent under dry
conditions, whereas radial crack formations are observed nearby the edges of the wear track under aqueous conditions.
International Conference of Advanced Materials and Manufacturing Technologies
ICAMT
Y. Kucuk
Mustafa Sabri Gök
Mecit Oge
In this research, sliding wear behavior of Cr2O3 (Metco 6156) coating, deposited onto AISI 420 specimens prepared
in a cylindrical form (Ø25x8 mm) using atmospheric plasma spray (APS) methods, was evaluated in water environment. For
this purpose, Cr2O3 powder, obtained from Sulzer Metco with commercial code Metco 6156 was deposited on AISI 420
stainless steel substrates. Wear mechanisms were interpreted using SEM analyses and 3D profilometer measurements of the
samples worn in aqueous media. Adhesive wear behaviors of the coating were comparatively evaluated for dry and aqueous
conditions using the same test parameters. The average friction coefficient value was found as 0.3 under dry conditions,
whereas this value was found to be nearly 30% lower after the tests in water. SEM micrographs of the worn surfaces show that,
the effect of plastic deformation was reduced in water. Also, the amount and lengths of the cracks forming on the worn surface
were found to be lower than those of dry conditions, and such cracks resulted in fatigue induced de-bonding.
International Conference of Advanced Materials and Manufacturing Technologies
ICAMT
Y. Kucuk
Mustafa Sabri Gök
Mecit Oge