Thin Films, Materials Surface & Interfaces
Bougoffa M. Seyf Eddine; Sayhia Benchaa
Abstract
The paper examines the influence of initial surface roughness and sliding speed on friction and wear behavior of AA6061 aluminum alloy and brass alloy (CuZn37Pb2) under dry contact using a CSM tribometer. Surface roughness of materials studied were measured using optical profilometer. Rough surfaces ...
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The paper examines the influence of initial surface roughness and sliding speed on friction and wear behavior of AA6061 aluminum alloy and brass alloy (CuZn37Pb2) under dry contact using a CSM tribometer. Surface roughness of materials studied were measured using optical profilometer. Rough surfaces (Ra=0.37 - 1.33 μm) were prepared on two materials: AA6061 and CuZn37Pb2 alloy. Track width, wear rate, and wear loss values were assessed and contrasted with changes in coefficient of friction values at various starting surface roughness and sliding speeds. Experiments are conducted at sliding speed 0.15;0.24;0.35 and 0.48 m/s. wear track diameter 4;6;8;10 mm. Results show that wear loss, wear rate and track width of CuZn37Pb2 and AA6061 increase at high initial surface roughness and speed but the value of friction coefficient decreases. Various SEM analysis of the wear trace and worn surfaces for each alloy at different sliding speed were analysed and compared.
Bougoffa M. Seyf Eddine; T. Sayah; Bachir Bey M. Nabil; Benouali Chahrazed
Abstract
The paper evaluates and compares the friction and wear behavior of SAE-AISI 1060 steel and brass (CuZn37Pb2) at different initial surface roughness and normal load using pin-on-disc test. Tribological behavior of studied materials was analyzed in detail. Variation of coefficient of friction at different ...
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The paper evaluates and compares the friction and wear behavior of SAE-AISI 1060 steel and brass (CuZn37Pb2) at different initial surface roughness and normal load using pin-on-disc test. Tribological behavior of studied materials was analyzed in detail. Variation of coefficient of friction at different initial surface roughness and normal load has been correlated with wear loss, wear rate, track width. Experiments are carried out in normal load 3-5-8-10 N, sliding speed 0.24-0.35m/s and 0.48 m/s, wear track diameter 4-6-8-10 mm. Results show that friction coefficient, wear loss and wear rate of steel increase with track width at high initial surface roughness and normal load. For brass friction coefficient decreases with the increase of normal load. On the other hand, it is also found that wear loss, wear rate and track width increase with sliding distance. Microscopic of worn surfaces for each alloy were carried out and compared.
T. Dharini; P. Kuppusami; A. M. Kamalan Kirubaharan; R. Ramaseshan; Arul Maximus Rabel; S. Dash
Abstract
The present paper reports on the measurement of coating adhesion with Inconel 718 as a function of substrate temperature in order to qualify the coatings for application in nuclear vitrification furnace. In the present study, the scratch indentation has been used to determine the critical loads ...
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The present paper reports on the measurement of coating adhesion with Inconel 718 as a function of substrate temperature in order to qualify the coatings for application in nuclear vitrification furnace. In the present study, the scratch indentation has been used to determine the critical loads and the friction coefficient offered by the coatings as a function of the substrate temperature. It is noticed that as the substrate temperature increases from 673 to 973 K, the critical load also increases from 2.5 N to 6.1 N, while the friction coefficient remains almost constant. Initially at lower loads, nested micro cracks which form in the coating open in the direction of the scratch track. As the scratch length increases with increasing load, the tensile cracking of YSZ gets transformed to conformal cracking. For the coatings deposited at higher temperature, chipping formation gets reduced as a consequence of improved adhesion of the coating with the substrate. This coating with an improved adhesion finds its application as diffusion barrier coating in nuclear vitrification furnace. This will reduce the faster degradation or premature failure of the components of vitrification furnace made up of Ni based super alloy. The use of YSZ diffusion barrier coating increases the durability and efficiency of the component.