In this work, we studied the high-speed tribological and mechanical properties of layered SiC particulate reinforced iron matrix composites. The layered composites consisted of a surface layer with high volume fraction of the reinforcement particles and a layer with low volume fraction in the bulk. The layered composites are a form of functionally graded materials with high wear resistance near the surface and high thermal conductivity in the bulk. The composites were prepared by standard powder metallurgy techniques. The tribological behavior of the composites was evaluated at 25 to 35 m/s sliding speeds using a sub-scale dynamometer disk brake testing system. The properties of the layered composites were compared to those of uniform composites. The results showed that the layered composites have better wear resistance and braking effectiveness in the range of braking speeds considered. The layered composites also showed higher bending strength than the monolayer composites due to the presence of the interfaces between the layers. © 2014, ASM International.

Srikanth Vedantam

Department of Engineering Design

Bending strength

Functionally graded materials

PARTICLE REINFORCED COMPOSITES

Powder metallurgy

Powder metals

Reinforcement

Silicon carbide

tribology

Volume fraction

Wear resistance

High thermal conductivity

High volume fraction

HIGH WEAR RESISTANCE

IRON MATRIX COMPOSITES

MATRIX COMPOSITE

POWDER METALLURGY TECHNIQUES

REINFORCEMENT PARTICLES

TRIBOLOGICAL BEHAVIORS

Metallic matrix composites

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Materials Engineering and Performance

In this article, we synthesized and studied functionally graded multilayered Cu/B4C/graphite hybrid composites. Two classes of layer-graded composites were considered: pure Cu layer with two layers consisting of different particle sizes and uniform particle volume and a pure Cu layer with a single additional layer. The properties of the layer-graded composites were compared to those of single layer composites of two different particle sizes (1–20 µm and 60–90 µm). The composites were tested for compression strength, flexural strength, hardness, density, and wear and braking performance at a range of sliding speed conditions (5, 10, 30, and 35 m/s). The microstructure of the interfaces in the layer-graded composites was characterized to determine the quality of bonding. We found that the layer-graded composites possess improved compression and flexural strength due to lower porosity and residual compressive stress in the composite layer aided by the work-hardening of the Cu layer. The presence of the ductile Cu layer improves the toughness and crack resistance properties of layer-graded composites by macrostructure toughening mechanism. The layer-graded composites possess improved wear resistance and braking performance at both low and high sliding speed conditions due to reduced third-body wear, oxidation, and softening of composites, aided by effective heat conduction through the Cu layer. Finally, the wear mechanisms operating at various speeds were discussed with the help of microscopic and X ray diffraction studies. © 2015, Copyright © Society of Tribologists and Lubrication Engineers.

Tribology Transactions

Layer-Graded Cu/B4C/Graphite Hybrid Composites: Processing, Characterization, and Evaluation of Their Mechanical and Wear Behavior

In this paper, we study the wear resistance of multi-layered composites of Cu/SiC + Gr hybrid composites prepared by layer compaction and pressure sintering. The tribological behavior and wear resistance of the composites were evaluated at a range of sliding speeds (5, 10, 30 and 35m/s) in a laboratory scale inertia brake dynamometer for brake friction material applications. The wear surface morphology and mechanisms were studied using scanning electron microscopy (SEM), XRD, and stereoscopy. The microstructure of the composites was also characterized using SEM and optical microscopy and the mechanical response in compression and flexure was evaluated. The results of these tests indicate that the density, wear resistance, braking behavior and mechanical response can be significantly improved by the presence of a layer of copper away from the sliding surface. The presence of the layer also improved friction and wear resistance significantly. The formation of mechanically mixed tribolayer and oxides (Fe3O4) reduced the wear rate and stabilized the friction coefficient at 30 and 35m/s. Finally, crack deflection and branching at the interface between the composite and Cu layers improved the flexural strength of the layered composites. The fractography analysis indicates a quasi-cleavage intergranular fracture in the composite layer and a purely ductile fracture in the Cu layer. © 2014 Elsevier B.V.

Wear

Tribological and mechanical behavior of multilayer Cu/SiC + Gr hybrid composites for brake friction material applications

Journal of the European Ceramic Society

Overview: Damage resistance of graded ceramic restorative materials

High speed sliding wear behavior of recycled WCP-reinforced ferrous matrix composites fabricated by centrifugal cast

Bulletin of Materials Science

Determination of elastic modulus in a nickel alloy from ultrasonic measurements

Journal of Minerals and Materials Characterization and Engineering

Development of Iron Based Brake Friction Material by Hot Powder Preform Forging Technique used for Medium to Heavy Duty Applications

Materials Science and Engineering: A

Experiment and modeling of mechanical properties on iron matrix composites reinforced by different types of ceramic particles

High-Speed Tribological and Mechanical Properties of Layered Fe/SiC Composites

Journal	Data powered by TypesetJournal of Materials Engineering and Performance
Publisher	Data powered by TypesetSpringer New York LLC
ISSN	10599495
Open Access	No