Sliding Wear Behavior of Al-Si/Graphite Composite

Rajaram, Gukan; Kumaran, S.; Rao, T. Srinivasa

doi:10.1080/10402004.2010.528854

Cited by 36 publications

(11 citation statements)

References 12 publications

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“…The graphite lubrication film becomes denser and thicker due to increased reinforcement content which covers the most of the worn surface uniformly. This layer might effectively reduce the amount of WVL which is in similar with results reported by Akhlaghi and Zare-Bidaki (2009) and Rajaram et al (2011).…”

Section: Sem Analysissupporting

confidence: 89%

Multi-response optimization of tribological characteristics of aluminum MMCs using PCA

Rajesh¹,

Krishna

Raju³

et al. 2014

Multidiscipline Modeling in Materials and Structures

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Purpose -Since, wear is the one of the most commonly encountered industrial problems leading to frequent replacement of components there is a need to develop metal matrix composites (MMCs) for achieving better wear properties. The purpose of this paper is to fabricate aluminum MMCs to improve the dry sliding wear characteristics. An effective multi-response optimization approach called the principal component analysis (PCA) was used to identify the sets of optimal parameters in dry sliding wear process. Design/methodology/approach -The present work investigates the dry sliding wear behavior of graphite reinforced aluminum composites produced by the molten metal mixing method by means of a pin-on-disc type wear set up. Dry sliding wear tests were carried on graphite reinforced MMCs and its matrix alloy sliding against a steel counter face. Different contact stress, reinforcement percentage, sliding distance and sliding velocity were selected as the control variables and the response selected was wear volume loss (WVL) and coefficient of friction (COF) to evaluate the dry sliding performance. An L25 orthogonal array was employed for the experimental design. Optimization of dry sliding performance of the graphite reinforced MMCs was performed using PCA. Findings -Based on the PCA, the optimum level parameters for overall principal component (PC) of WVL and COF have been identified. Moreover, analysis of variance was performed to know the impact of individual factors on overall PC of WVL and COF. The results indicated that the reinforcement percentage was found to be most effective factor among the other control parameters on dry sliding wear followed by sliding distance, sliding velocity and contact stress. Finally the wear surface morphology of the composites has been investigated using scanning electron microscopy. Practical implications -Various manufacturing techniques are available for processing of MMCs. Each technique has its own advantages and disadvantages. In particular, some techniques are significantly expensive compared to others. Generally the manufacturer prefers the low cost technique. Therefore stir casting technique which was used in this paper for manufacturing of Aluminum MMCs is the best alternative for processing of MMCs in the present commercial sectors. Since the most important criteria of a dry sliding wear behavior is to provide lower WVL and COF, this study has intended to prove the application of PCA technique for solving multi objective optimization problem in wear applications like piston rings, piston rods, cylinder heads and brake rotors, etc. Originality/value -Application of multi-response optimization technique for evaluation of tribological characteristics for Aluminum MMCs made up of graphite particulates is a first-of-its-kindThe current issue and full text archive of this journal is available at 276 MMMS 10,2 approach in literature. Hence PCA method can be successfully used for multi-response optimization of dry sliding wear process.

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Section: Sem Analysissupporting

confidence: 89%

Multi-response optimization of tribological characteristics of aluminum MMCs using PCA

Rajesh¹,

Krishna

Raju³

et al. 2014

Multidiscipline Modeling in Materials and Structures

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“…AlSi-11.25%Ti-5%SiC hybrid composite exhibited the highest improvement in wear rate. MMCs generally demonstrate improved wear performance compare to the corresponding matrix material [17][18][19]. However, there are some reports where MMCs displayed wear resistance comparable to that of corresponding matrix materials under certain conditions [18,20].…”

Section: Introductionmentioning

confidence: 99%

Effects of reinforcement on wear resistance of aluminum matrix composites

Pramanik

2016

Transactions of Nonferrous Metals Society of China

151

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The effect of reinforcement on wear mechanism of MMCs has been investigated in this paper by considering different parameters, such as, sliding distance (6 km), pressure (1.4-11 bar) and sliding speed (230-1480 rpm). The explicitness was introduced by comparing wear mechanism of an MMC and corresponding matrix material side by side under similar experimental conditions on a pin-on-disc wear machine. The pins were made of matrix material is 6061 aluminum alloy and, MMC which consists of 6061 aluminum alloy reinforced with 10 volume % Al2O3 particles (6-18 μm). The disc was made of steel. The major findings are: (1) MMC shows much higher wear resistance than the corresponding matrix material, (2) unlike matrix material the wear of MMC is very much linear and possible to predict easily under the conditions considered in this investigation, (3) the wear mechanism is similar for both materials other than the three body abrasion in case of MMC and (4) the reinforced particles resist the abrasion and restricts deformation of MMCs which cause high resistance to wear. These results reveal the roles of the reinforcement particles on the wear resistance of MMCs and provide a useful guide for a better control of their wear.

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“…Previous work (Prasad and Ramakrishnan (8)) acknowledged graphite as a predominant solid lubricating material for some specific applications. Aluminum alloy-graphite particulate composites have merit as a self-lubricating material with the enhancement of the wear resistance and machinability and delayed onset of severe wear and seizure (Lin,et al (9); Rajaram, et al (10)). Earlier researchers have reported that the aluminum alloy-graphite composite under dry sliding condition helps in the formation of a film of graphite as a solid lubricant between the contacting surfaces (Akhlaghi and Zare-Bidaki (11)), which reduces the friction and wear and postpones the onset of severe wear.…”

Section: Introductionmentioning

confidence: 99%

Effect of Graphite on Tribological and Mechanical Properties of AA7075 Composites

Baradeswaran¹,

Perumal

2014

Tribology Transactions

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The influence of graphite particulates on the dry sliding wear behavior of aluminum alloy 7075 (AA7075)-graphite composites has been evaluated using a pin-on-disc apparatus. The materials were fabricated by a liquid casting technique. Composites with 5-20 wt% graphite particles were processed. The casted composites were subjected to T6 heat treatment. The effect of sliding speed and sliding distance has been studied under dry sliding conditions. The hardness of the composites is measured using a Brinell hardness tester and their tensile strength is measured using a universal testing machine. The wear rate of the composites reduced with the addition of graphite content and reached a minimum with 5 wt% graphite content. The coefficient of friction is decreased with the addition of graphite content and reached a minimum at 5 wt% graphite. The effect of graphite on hardness and tensile strength is also studied. The worn surfaces of the pin specimen are analyzed with scanning electron microscopy. The 7075 aluminum alloy exhibited its potential to act effectively as a self-lubricating material under dry sliding conditions in the lower range of graphite content, and 5 wt% graphite appeared to be optimum.

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Sliding Wear Behavior of Al-Si/Graphite Composite

Cited by 36 publications

References 12 publications

Multi-response optimization of tribological characteristics of aluminum MMCs using PCA

Multi-response optimization of tribological characteristics of aluminum MMCs using PCA

Effects of reinforcement on wear resistance of aluminum matrix composites

Effect of Graphite on Tribological and Mechanical Properties of AA7075 Composites

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