Effect of Counter Surface Temperature and Load on the Transition from Mild to Severe Wear Behavior of Al-Si-SiCp Composites in Reciprocating Conditions

2012 ◽  
Vol 710 ◽  
pp. 551-556
Author(s):  
V.R. Rajeev ◽  
D.K. Dwivedi ◽  
S.C. Jain
Keyword(s):  
Surface Temperature ◽  
Wear Behavior ◽  
Wear Test ◽  
Stir Casting ◽  
Material Loss ◽  
Severe Wear ◽  
Mild Wear ◽  
Sem Study ◽  
Composite Mode ◽  
Counter Surface

In the present paper, the effect of counter surface temperature and load on the transition from mild to severe wear of A319/15%SiCp, A336/15%SiCp, and A390/15%SiCp composites have been reported. Composites were produced through stir casting route. Adhesive wear behavior of composites was studied under dry reciprocating conditions using indigenously developed reciprocating friction wear test rig conforming to ASTM standard G133-05. It was found that increase in counter surface temperature increases wear rate and depending upon the load and type of composite mode of wear changes from mild oxidative to severe metallic wear noticed. At 120N load, the critical transition temperature for all the three Al-Si-SiCp composites was found to be 350°C. SEM study of wear surface and wear debris was conducted to analyze the mode of wear and operating wear mechanism. Severe wear was characterized by massive plastic deformation and gross material removal while the mild wear was found to be associated with delamination and scoring as main wear mechanisms responsible for material loss.

DRY SLIDING WEAR BEHAVIOR OPTIMIZATION OF STIR CAST LM6/ZrO2 COMPOSITES BY RESPONSE SURFACE METHODOLOGY ANALYSIS

2016 ◽  
Vol 40 (3) ◽  
pp. 351-369 ◽  
Author(s):  
G. Karthikeyan ◽  
G.R. Jinu
Keyword(s):  
Mathematical Model ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Wear Behavior ◽  
Wear Test ◽  
Stir Casting ◽  
Dry Sliding Wear ◽  
Experimental Conditions ◽  
Weight Percentage ◽  
The Mathematical Model

LM6 was reinforced with various percentages of ZrO2 particles by using stir casting method. The prepared samples were subjected to tensile and wear test at variable loads by using a pin-on-disc wear tester. The curve fitting technique was used to develop the respective linear, logarithmic, polynomial, power law equations. The wear worn surface and surface roughness of the specimen were studied. Response Surface Methodology (RSM) was used to minimize the number of experimental conditions and develop the mathematical model between the key process parameters namely weight percentage of ZrO2, load and sliding distance. Analysis of Variance technique was applied to check the validity of the developed model. The mathematical model developed for the specific wear rate was predicted at 99% confidence level and some useful conclusions were made.

scholarly journals Knee Wear Assessment: 3D Scanners Used as a Consolidated Procedure

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2349 ◽  
Author(s):  
Saverio Affatato ◽  
Maria Cristina Valigi ◽  
Silvia Logozzo
Keyword(s):  
Clinical Performance ◽  
Wear Behavior ◽  
Wear Test ◽  
Mobile Bearing ◽  
Clinical Problem ◽  
Material Loss ◽  
Optical Scanners ◽  
Wear Rates ◽  
3D Scanners

It is well known that wear occurring in polyethylene menisci is a significant clinical problem. At this regard, wear tests on biomaterials medical devices are performed in order to assess their pre-clinical performance in terms of wear, durability, resistance to fatigue, etc. The objective of this study was to assess the wear of mobile total knee polyethylene inserts after an in vitro wear test. In particular, the wear behavior of mobile bearing polyethylene knee configurations was investigated using a knee joint wear simulator. After the completion of the wear test, the polyethylene mobile menisci were analyzed through a consolidated procedure by using 3D optical scanners, in order to evaluate the 3D wear distribution on the prosthesis surface, wear depths, wear rates, amount of material loss and contact areas. The results in terms of wear rates and wear volumes were compared with results of gravimetric tests, finding equivalent achievements.

Mathematical Model Development to Predict Wear Rate of Al6061/TiCp Composites under Lubricant

2015 ◽  
Vol 813-814 ◽  
pp. 74-78 ◽  
Author(s):  
K. Ragupathy ◽  
C. Velmurugan ◽  
S. Rajesh ◽  
D.S. Ebenezer Jacob Dhas
Keyword(s):  
Mathematical Model ◽  
Wear Rate ◽  
Wear Behavior ◽  
Design Method ◽  
Model Development ◽  
Wear Test ◽  
Stir Casting ◽  
Matrix Composites ◽  
Pin On Disc ◽  
Carbide Particles

Aluminium matrix composites are mostly used in aerospace and automobile industries due to their improved properties such as hardness, strength, wear resistance combined with considerable weight savings over unreinforced alloys. This paper reports the lubricated wear behavior of Al6061composites reinforced with titanium carbide particles fabricated by stir casting route. The experiments were conducted using central composite rotatable design method. The wear test was performed on the pin on disc machine where aluminium composite pins were rubbed against EN31 steel discs in the presence lubricant. A mathematical model has been developed by response surface methodology. The validity of the developed model was checked by Analysis of variance method. The experimental results revealed that the addition of lubricant at the contact surface reduced wear rate of the composite.

Predicting Bearing Performance of Filled Teflon TFE Resins

1967 ◽  
Vol 89 (1) ◽  
pp. 182-186 ◽  
Author(s):  
R. B. Lewis
Keyword(s):  
Surface Temperature ◽  
Bearing Surface ◽  
Temperature Dependent ◽  
Wear Factor ◽  
Severe Wear ◽  
Wear Rates ◽  
Surface Temperatures ◽  
Mild Wear ◽  
New Evidence

The wear rates of filled compositions of Teflon can be reliably predicted using an experimentally determined wear factor if the bearing pressure, velocity, temperature, and geometry are known. New evidence confirms the wear rates are directly proportional to pressure and velocity in both the mild wear regime and the severe wear regime, although the wear factors are much higher in the severe regime. The transition from mild to severe wear is pressure and surface temperature dependent and coincides with (but is not adequately described by) PV limit. An application factor is proposed to relate bearing surface temperatures to PV and geometry.

Effect of Multiple Firing on Wear Behavior of Dental Veneering Ceramic

2008 ◽  
Vol 368-372 ◽  
pp. 1245-1247
Author(s):  
Q.P. Gao ◽  
Yong Lie Chao ◽  
F. Guo ◽  
Xin Chun Jian ◽  
C.J. Xu
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Frictional Coefficient ◽  
Wear Test ◽  
Wear Scar ◽  
Severe Wear ◽  
Significant Difference ◽  
All Ceramic ◽  
Oral Environment ◽  
Scar Width

This study investigated the effect of multiple firing on the wear behavior of dental all-ceramic veneering ceramic (Cercon). Samples were fabricated according to the manufacturer's requirement for different firing times. The wear test was operated under simulated oral environment. The results showed that multiple firing could influence wear behavior of all-ceramic Veneer. Significant difference was observed in wear scar width among different samples. All the groups except 7time-firing one showed good wear resistance with low wear rate, smooth surface and relatively constant frictional coefficient. With the increasing firing times the wear scar width became larger. The wear resistance of dental ceramic after seven times firing was significantly lower. SEM/DFM results showed the wear facets of veneering ceramic demonstrate grooves characteristic of abrasive wear. The significant change was that severe wear dominated by brittle fracture could be seen in the 7time-firing group. Multiple firing can decrease the wear resistance of dental all-ceramic Veneer, and the wear pattern has the tendency to severe wear. The possible explanation is that the microstructure and properties of all-ceramic Veneering changed during multiple firing.

CHARACTERIZATIONS OF CU-BASED COATED AL7075 VIA PLASMA-SPRAY METHOD — A WEAR CASE STUDY

2011 ◽  
Vol 10 (06) ◽  
pp. 1269-1274 ◽  
Author(s):  
M. J. GHAZALI ◽  
S. E. MAT KAMAL ◽  
S. ABDULLAH ◽  
H. MISRAN
Keyword(s):  
Plasma Spray ◽  
Wear Behavior ◽  
Wear Test ◽  
Atmospheric Plasma ◽  
Good Surface ◽  
Spray Method ◽  
Mild Wear ◽  
Ni Alloy ◽  
Pin On Disc ◽  
High Degree

Despite of its poor tribological properties (low hardness and low resistance to friction, wear and abrasion as well as poor seizure resistance), aluminum has become a potential material in automotives, particularly in the engine areas. To overcome these weaknesses and increase the engine lifetime, a good surface treatment can be one of the best options. In this work, Cu-Ni alloy that has such excellent properties like ductility, corrosion and wear resistance, good electrical and thermal conductivity as well as it can be easily joined or fabricated into useful shapes, was chosen. The work aims to study the wear behavior of Cu-Ni coatings deposited on Al7075 substrates using an atmospheric plasma spray (APS) with different level of plasma powers. Lubricated wear test were carried out on a pin-on-disc tester under an applied load of 100 N with a fixed sliding speed of 0.851 ms-1 at room temperature (~ 23°C). It was found that a decrease in plasma power from 40 kW to 30 kW promoted finer microstructures and higher hardness of the coatings, up to 39%. At 30 kW, the splats formation involved high degree of flattening and solidification without many splashes within the structure. At higher power (40 kW), both velocity and temperature of droplets were noted to be increased, resulting rougher coating structures which were most likely due to overlapped splats. In turn, this weakened the bonding strength between splats. In the case of wear, the resistance of Cu-Ni coated Al7075 was found to be increased from ~6 to 18 × 10-5 mm3/Nm, indicating a mild wear regime that was attributed to an increase in the coating hardness.

Effect of reinforcement percentage on wear behavior of SiCp reinforced ZA43 alloy metal matrix composites

2013 ◽  
Vol 20 (4) ◽  
pp. 311-317 ◽  
Author(s):  
Rajaneesh N. Marigoudar ◽  
Kanakuppi Sadashivappa
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
Wear Behavior ◽  
Abrasive Particle ◽  
Wear Test ◽  
Stir Casting ◽  
Dry Sliding Wear ◽  
Scanning Electron Micrographs ◽  
Matrix Composites ◽  
Casting Technique

AbstractMetal matrix composites (MMCs) are characterized by high specific strength and stiffness. Light metal alloys are reinforced with hard ceramic particles, which show better properties compared to monolithic alloys. ZA43 MMCs are fabricated by stir casting technique by reinforcing preheated silicon carbide particles (SiCp). Wear behavior of ZA43 MMCs is evaluated by conducting dry sliding wear test using a pin-on-disc wear test rig. The tests were conducted for varying loads of 9.81, 19.62, 29.43 and 39.24 N and sliding disc speeds of 2.12, 2.93, 3.66, 4.39 and 5.13 m/s at constant time of 15 min. The results reveal that the wear resistance property of the composite increases as the percentage of reinforcement increases. It was also observed that volume loss increases with increasing applied load and sliding speed. The tested samples were examined and analyzed by taking scanning electron micrographs. The dominating wear mechanisms observed were delamination, scissoring of the abrasive particle, pullout of particle, smearing of the surface and abrasion.

Slurry erosion performance of CeO2-modified Ni–WC coatings

2014 ◽  
Vol 66 (4) ◽  
pp. 533-537 ◽  
Author(s):  
Surajit Purkayastha ◽  
Dheerendra Kumar Dwivedi
Keyword(s):  
Erosion Resistance ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Erosive Wear ◽  
Wear Test ◽  
Silica Sand ◽  
Slurry Erosion ◽  
Content Type ◽  
Sem Study ◽  
Erosion Test

Purpose – This paper aims to deal with the study of effect of cerium oxide (CeO2) modification on the sand slurry erosion resistance of Ni – tungsten carbide (WC) coatings. Design/methodology/approach – Flame-sprayed conventional and CeO2-modified Ni–WC coatings were developed on a mild steel substrate. Slurry erosion tests were carried out in an in-house-designed and fabricated pot-type slurry erosion test rig to evaluate wear behavior of conventional and modified coatings. The erosive wear test was conducted using 5 per cent silica sand slurry at 850 rpm. Findings – Modified coatings exhibited increased hardness as compared to the conventional coating. Slurry erosion resistance of most modified coatings was superior to that of the unmodified coating. Hardness of coating doped with 0.9 per cent CeO2 was highest among all coatings, and concomitantly this composition also showed the least wear. Scanning electron microscopy (SEM) revealed that microcutting was much less in the modified coating. Originality/value – Slurry erosion wear of Ni–WC flame-sprayed coatings in sand slurry media is substantiated by extensive SEM study.

scholarly journals Effect of Boron Carbide on wear resistance of graphite containing Al7029 Based Hybrid Composites and its Dry Sliding Wear Characterization Through Experimental, Response Surface Method and ANOVA

2021 ◽  
Vol 38 (3−4) ◽  
Author(s):  
Madhu K S ◽  
Venkatesh C V ◽  
Sharath B N ◽  
Karthik S
Keyword(s):  
Wear Rate ◽  
Materials Science ◽  
Hybrid Composites ◽  
Wear Behavior ◽  
Base Alloy ◽  
Wear Test ◽  
Science Research ◽  
Stir Casting ◽  
Dry Sliding Wear ◽  
Pin On Disc

Composites are often chosen for tribological applications due to its tailored material properties. The development of hybrid metal matrix composites and the study of their wear behavior has been a prominent focus of materials science research. Present paper deals with fabrication of Al-7029/B4C/Gr hybrid composite using stir casting. Particle distribution and material phase are identified by SEM and XRD. Hardness of the composite increased to 101 BHN while base alloy with 63 BHN. Pin-on-disc Tribometer used to carry wear test and the experimentation conducted by considering three input wear control parameters: 15–35 N (load), 1.5–3.5 m/s (speed) and 200–600 m (distance). Addition of 6%B4C/3%Gr, wear rate of hybrid composites reduced. ANOVA confirmed that load as the most influencing parameter on wear rate. RSM results correlates with mean effect plots of ANOVA and experiments and found that the results are in good compliance. SEM graphs of worn surface confirms that more wear occurred with increased load.

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