Developing trends in disc bralke technology for rail application

Zeuner, T.; Stojanov, Petar; Sahm, P. R.; Ruppert, H.; Engels, Andreas

doi:10.1179/mst.1998.14.9-10.857

Cited by 31 publications

(13 citation statements)

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“…In recent years, aluminum matrix composites have found extensive application because of their high elastic modulus, hardness, tensile strength at room and high temperatures, and wear properties [5,6]. Although the mechanical properties of particulate-reinforced composites are rather low compared to continuous fiber-reinforced composites, they are preferred by automotive sector due to their low cost and isotropic properties [7,8].…”

Section: Introductionmentioning

confidence: 99%

“…By using MA technique, the agglomeration of the reinforcement particles is easily prevented and homogeneous distribution of the reinforcement within the matrix is 290 provided [2, 3]. Since MMCs contain at least two materials insoluble in each other, the properties of MMCs can be tailored according to different applications by adjusting the ratio of matrix and reinforcement [4].In recent years, aluminum matrix composites have found extensive application because of their high elastic modulus, hardness, tensile strength at room and high temperatures, and wear properties [5,6]. Although the mechanical properties of particulate-reinforced composites are rather low compared to continuous fiber-reinforced composites, they are preferred by automotive sector due to their low cost and isotropic properties [7,8].…”

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confidence: 99%

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Effect of Al2O3 amount on microstructure and wear properties of Al–Al2O3 metal matrix composites prepared using mechanical alloying method

Özyürek

Tekeli

Güral

et al. 2010

Powder Metall Met Ceram

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UDC 621.762 This paper reports the outcome of an investigation into the effect of Al 2 O 3 content on the microstructure and wear properties of Al-Al 2 O 3 metal matrix composites. The Al-Al 2 O 3 composites are prepared by a mechanical alloying method using Al 2 O 3 powders up to 20 vol.% as reinforcement. Alloying is performed in a vibration mill using a ball-to-powder ratio 10:1 and a milling time varying from 30 to 100 min at a rate of 710 Hz. The prepared compositions are cold pressed at 630 MPa with a single action and sintered at 560°C for 30 min under Ar gas atmosphere. The experimental results show that the reinforcing phase Al 2 O 3 is homogeneously dispersed in the Al matrix and the interface between Al matrix and Al 2 O 3 is well formed. Wear tests are carried out under dry sliding conditions using a pin-on-disk testing machine at three different loads of 10, 25, and 50 N and at a sliding speed of 2.08 m/sec. Total sliding distances are selected as 400, 800, 1200, and 1600 m. It is seen that the wear rate decreases with increasing Al 2 O 3 content and sliding distance at a sliding speed of 2.08 m/sec. INTRODUCTIONMetal-matrix composites (MMCs) containing reinforcement particulates are well known for their high strength, ductility, and wear resistance when compared to their unreinforced counterparts. In MMCs, the ductile structure is provided by the metallic matrix, while the elastic modulus and mechanical strength are increased by the addition of reinforcement phase [1]. The presence of hard reinforcement phases, either particulates, fibers, or whiskers, provides MMCs with good tribological characteristic.Although MMCs are regarded as excellent materials, the high processing costs limit their use. There are a number of processing techniques available for the production of MMCs. Among them, the mechanical alloying (MA), which is a solid-state powder processing technique, has been frequently used to synthesize MMCs with better properties than those obtained by other methods. By using MA technique, the agglomeration of the reinforcement particles is easily prevented and homogeneous distribution of the reinforcement within the matrix is 290 provided [2, 3]. Since MMCs contain at least two materials insoluble in each other, the properties of MMCs can be tailored according to different applications by adjusting the ratio of matrix and reinforcement [4].In recent years, aluminum matrix composites have found extensive application because of their high elastic modulus, hardness, tensile strength at room and high temperatures, and wear properties [5,6]. Although the mechanical properties of particulate-reinforced composites are rather low compared to continuous fiber-reinforced composites, they are preferred by automotive sector due to their low cost and isotropic properties [7,8]. In the automotive applications, SiC-and Al 2 O 3 -reinforced composites are used for the production of cylinder blocks, pistons and break disks [9]. Therefore, the improvement of wear resistance of Al matrix composites is rather impo...

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Section: Introductionmentioning

confidence: 99%

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confidence: 99%

Effect of Al2O3 amount on microstructure and wear properties of Al–Al2O3 metal matrix composites prepared using mechanical alloying method

Özyürek

Tekeli

Güral

et al. 2010

Powder Metall Met Ceram

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“…Applications for cylinder liners and brake pad rotors are discussed, although it is not clear whether these have been commercialised. In another paper, the use of Al based MMCs in disk brakes for rail application is described in some detail by Zeuner et al 87 Particle clustering in high volume fraction composites was elegantly treated by Murphy et al, 88 who used an Al-9Si-0?5Mg alloy containing 20 vol.-% of SiC particles that had been processed by different routes to give different microstructures exhibiting varying degrees of particle clustering. The microstructures were analysed statistically and a reliable clustering parameter recommended.…”

Section: Metal Matrix Compositesmentioning

confidence: 99%

Editorial

2011

Materials Science and Technology

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“…Powder metallurgy is used to produce complex automobile parts such as connecting rods, cams, roller bearings, cylinder liners, etc. [7]- [13].…”

Section: Introductionmentioning

confidence: 99%

A Study of Porosity Effect on Tribological Behavior of Cast Al A380M and Sintered Al 6061 Alloys

Sinha¹,

Farhat²

2015

JSEMAT

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Due to their light weight, high corrosion resistance and good heat conductivity, aluminium alloys are used in many industries today. They are suitable for manufacturing many automotive components such as clutch housings. These alloys can be fabricated by powder metallurgy and casting methods, in which porosity is a common feature. The presence of pores is responsible for reducing their strength, ductility and wear resistance. The present study aims to establish an understanding of the tribological behavior of high pressure die cast Al A380M and powder metallurgy synthesized Al 6061. In this study, dry sliding wear behavior of Al A380M and Al 6061 alloys was investigated under low loads (1.5 N-5 N) against AISI 52100 bearing steel ball using a reciprocating ball-on-flat configuration and frequency of 10 Hz. Wear mechanisms were studied through microscopic examination of the wear tracks. This study revealed that due to combined effect of real area of contact and subsurface cracking, wear rate increased with increasing porosity content. The difference in friction and wear behavior between received Al A380M and Al 6061 is attributed to their hardness differences.

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Developing trends in disc bralke technology for rail application

Cited by 31 publications

References 1 publication

Effect of Al2O3 amount on microstructure and wear properties of Al–Al2O3 metal matrix composites prepared using mechanical alloying method

Effect of Al2O3 amount on microstructure and wear properties of Al–Al2O3 metal matrix composites prepared using mechanical alloying method

Editorial

A Study of Porosity Effect on Tribological Behavior of Cast Al A380M and Sintered Al 6061 Alloys

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