Wear Characterization of Al/Ingredients MMFC

2009 ◽  
Vol 131 (4) ◽  
Author(s):  
Anil K. Chaturvedi ◽  
K. Chandra ◽  
P. S. Mishra
Keyword(s):  
Silicon Carbide ◽  
Hybrid Composite ◽  
Wear Behavior ◽  
Physical And Mechanical Properties ◽  
Solid Lubricants ◽  
Optical Microscope ◽  
Apparent Porosity ◽  
Particulate Composites ◽  
Dry Sliding Wear ◽  
Al Alloy

In this study, dry sliding wear behavior of Al alloy (Al 2219) based metal matrix friction composites (AlMMFCs) incorporated with varying percentage of ingredients: silicon carbide particles (15–25 wt %SiCp) and solid lubricants with 4 wt % graphite and 1 wt % antimony trisulphide (Sb2S3) were investigated. A group of four new chemical formulations, three binary composites of Al/SiCp (Al01N, Al02N, and Al03N), and a hybrid composite of Al/SiCp/solid lubricants (Al04N) were fabricated by newly a developed “cold-hot powder die compaction” method. Physical and mechanical properties were measured as usual. To measure tribological properties, dry pin-on-disk wear tests were conducted for 1 hour at varying loads of 1 MPa and 2 MPa and at sliding speeds of 3 m/s, 5 m/s, 7 m/s, and 9 m/s. The results revealed that the incorporation of SiCp from 15 wt % to 25 wt % in binary composite, density (2.8–2.9 g/cc), apparent porosity (1.4–3.4 vol %), and hardness (78–93 BHN) were increased. For hybrid composite, density (2.9–2.76 g/cc) and hardness (93–81 BHN) were decreased with the increase in apparent porosity (3.4–4.1 vol %). It was concluded that the obtained density is higher than the reported density and the obtained apparent porosity is much lower than the reported apparent porosity by Aigbodi et al. (2007, “Effects of Silicon Carbide Reinforcement on Microstructure and Properties of Cast Al–Si–Fe/Sic Particulate Composites,” Mater. Sci. Eng., A, 447, pp. 355–360) for same composition using “double stir casting” method. The value of coefficient of friction with addition of solid lubricants increased and steady at high load and speed (2 MPa, >5 m/s).The microstructures, worn surfaces, and tribolayers are also analyzed by an optical microscope and SEM. This study overviews AlMMFCs incorporated with hard particles and solid lubricants and the new technology for producing brake lining parts from these novel materials.

Dry Sliding Wear Behavior of 2218 Al-Alloy-Al2O3(TiO2) Hybrid Composites

2017 ◽  
Vol 140 (2) ◽  
Author(s):  
Vineet Tirth
Keyword(s):  
Wear Rate ◽  
Sliding Wear ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Dry Sliding Wear ◽  
Aged Alloy ◽  
Dry Sliding ◽  
Al Alloy ◽  
Mathematical Relationship ◽  
Sliding Distance

AA2218–Al2O3(TiO2) composites are synthesized by stirring 2, 5, and 7 wt % of 1:2 mixture of Al2O3:TiO2 powders in molten AA2218 alloy. T61 heat-treated composites characterized for microstructure and hardness. Dry sliding wear tests conducted on pin-on-disk setup at available loads 4.91–13.24 N, sliding speed of 1.26 m/s up to sliding distance of 3770 m. Stir cast AA2218 alloy (unreinforced, 0 wt % composite) wears quickly by adhesion, following Archard's law. Aged alloy exhibits lesser wear rate than unaged (solutionized). Mathematical relationship between wear rate and load proposed for solutionized and peak aged alloy. Volume loss in wear increases linearly with sliding distance but drops with the increase in particle wt % at a given load, attributed to the increase in hardness due to matrix reinforcement. Minimum wear rate is recorded in 5 wt % composite due to increased particles retention, lesser porosity, and uniform particle distribution. In composites, wear phenomenon is complex, combination of adhesive and abrasive wear which includes the effect of shear rate, due to sliding action in composite, and abrasive effect (three body wear) of particles. General mathematical relationship for wear rate of T61 aged composite as a function of particle wt % load is suggested. Fe content on worn surface increases with the increase in particle content and counterface temperature increases with the increase in load. Coefficient of friction decreases with particle addition but increases in 7 wt % composite due to change in microstructure.

Dry sliding wear behavior of SS316L composites containing h-BN and MoS2 solid lubricants

Wear ◽  
2014 ◽  
Vol 316 (1-2) ◽  
pp. 37-48 ◽  
Author(s):  
S. Mahathanabodee ◽  
T. Palathai ◽  
S. Raadnui ◽  
R. Tongsri ◽  
N. Sombatsompop
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Solid Lubricants ◽  
Dry Sliding Wear ◽  
Dry Sliding

Heat Treatment and Wear Characteristics of Al2O3 and TiC Particulate Reinforced AA6063 Al Alloy Hybrid Composites

2006 ◽  
Vol 128 (4) ◽  
pp. 891-894 ◽  
Author(s):  
M. Abdel Aziz ◽  
T. S. Mahmoud ◽  
Z. I. Zaki ◽  
A. M. Gaafer
Keyword(s):  
Heat Treatment ◽  
Sliding Wear ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Age Hardening ◽  
Peak Hardness ◽  
Dry Sliding Wear ◽  
Al Alloy ◽  
Composite Alloy ◽  
Al2o3 Particles

In this article, the heat treatment and dry sliding wear behavior of Al-based AA6063 alloy reinforced with both TiC and Al2O3 ceramic particles were studied. The particles were synthesized by self-propagating high temperature synthesis (SHS) technique. The prepared composite alloy contains 5vol.%Al2O3 and 5vol.% TiC particles. The composite alloy was prepared by vortex method. To attain the peak hardness values of the alloys, age hardening behavior of the monolithic alloy and also the composite alloy was investigated. The wear tests were performed at room temperature using a pin-on-disk type apparatus. The results showed that the addition of TiC and Al2O3 particles increases the hardness of the AA6063 Al alloy and at the same time accelerates the aging kinetics. The sliding wear properties of AA6063 Al alloy were significantly improved by the addition of TiC and Al2O3 particles.

Production and Characterization of Aluminium Metal Matrix Composite Reinforced with Al3Ni by Stir and Squeeze Casting

2015 ◽  
Vol 766-767 ◽  
pp. 315-319
Author(s):  
R. Ramesh ◽  
S. Suresh Kumar ◽  
S. Gowrishankar
Keyword(s):  
Squeeze Casting ◽  
Wear Behavior ◽  
Optical Microscope ◽  
Dry Sliding Wear ◽  
Mechanical And Tribological Properties ◽  
Intermediate Phases ◽  
Ni Powder ◽  
Xrd Patterns

In the present work AA1100/ Al3Ni MMC was successfully fabricated using the in-situ method of stirring and squeeze casting. The effects of amount of Ni powder on the formation and mechanical behavior of Al-Al3Ni MMC were investigated. The fabricated MMC was characterized using XRD and optical microscope. The XRD patterns clearly indicated the presence of Al3Ni particles without the formation of intermediate phases. The in-situ formed Al3Ni particles were found to have uniform distribution, good bonding and clear interface. The mechanical and tribological properties such as hardness, Ultimate Tensile Strength (UTS) and dry sliding wear behavior of AA1100/ Al3Ni MMC were compared for stir and squeeze casted MMCs with different percentage in weight of Al3Ni (5, 10 wt. %) and it was found that properties improved with increase in Al3Ni content and all properties of squeeze casted MMCs were superior to stir casted MMCs.

Tribological Characteristics of Aluminium Tri-Reinforced Particles (Al-TRP) Composites Developed by Liquid Metallurgy Route

2012 ◽  
Vol 585 ◽  
pp. 574-578 ◽  
Author(s):  
Suresh Kumar ◽  
Ranvir Singh Panwar ◽  
Omprakash P. Pandey
Keyword(s):  
Wear Behavior ◽  
Base Alloy ◽  
Aluminum Matrix ◽  
Wear Test ◽  
Tribological Characteristics ◽  
Dry Sliding Wear ◽  
Aluminum Matrix Composites ◽  
Dry Sliding ◽  
Al Alloy ◽  
Ceramic Particles

Discontinuous reinforced aluminum matrix composites (DAMCs) are widely used in automobiles, military and many other engineering areas due to their attractive properties. DAMCs are used in automobile industries for manufacturing bogies, cars and other structural components. Apart from this it is also used in components which are subjected to high temperatures. In the present work we have studied the tribological characteristics of DAMCs containing zircon sand, SiC and Zirfloor as reinforced ceramic particles in Al alloy. These three types of ceramic particles (particle size 0-32 µm) are reinforced in the Al-12Si alloy (LM13) by liquid metallurgy route (stir casting technique). Total 15 wt% of the tri reinforced particles (TRP) are added in LM13 alloy to fabricate Al–TRP composite for tribological application. Wear characteristics of Al–TRP composites have been investigated under dry sliding conditions. Dry sliding wear tests have been carried out using a pin-on-disc method at 1Kg and 5Kg loads. Sliding distance during the wear test was about 3000 meters with a constant sliding velocity of 1.6 ms-1. In the study it was observed that wear rate of the composite increases with increase in amount of load. Microhardness measurement was done for the developed Al-TRP composite. SEM images of wear track on composite gives better idea of the wear mechanism. Wear debris collected after the wear test was also examined for deeper understanding of wear behavior. Study reveals that about equal amount of ZrSiO4, SiC and Zirfloor reinforced particle in Al-TRP composite exhibits better wear resistance compared to aluminum base alloy.

Investigation on Wear Behavior of Electrostatic Micro-Solid Lubricant Coatings Under Dry Sliding Conditions

2012 ◽  
Author(s):  
UmaMaheshwera Reddy Paturi ◽  
Narala Suresh Kumar Reddy
Keyword(s):  
Wear Resistance ◽  
Solid Lubricant ◽  
Wear Behavior ◽  
Spray Coating ◽  
Solid Lubricants ◽  
Dry Sliding Wear ◽  
Wear Volume ◽  
Dry Sliding ◽  
Molybdenum Disulphide ◽  
Aluminum Specimen

Dry sliding experiences high friction and wear thus influencing the life and quality of the parts under sliding. To provide low friction and improve wear resistance, solid lubricants have an edge over conventional choice. This article features a specific study of the application of solid lubricant in dry sliding operations and presents its influence on wear resistance. Using a pin-on-disc tribometer designed according to ASTM G99 standard, dry sliding wear tests on aluminum alloy AA6351-T6 specimens were performed against uncoated EN31 steel and molybdenum disulphide (MoS2) coated EN31 steel discs. In this study, counter surfaces (discs) were coated with micron sized MoS2 solid lubricant powder particles using electrostatic spray coating (ESC) method. The best results for wear volume and friction coefficient (minimum values) were registered when aluminum specimen slid against MoS2 coated EN31 steel. Outcome of this study shows that the presence of solid lubricant film on disc specimen will greatly influence the sliding performance of pin material in lubricating and preventing wear through reduction in the frictional force due to presence of lamellar structure as a transfer film and favorable change in sliding interaction.

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