Dry Sliding Wear Mechanism of Spark Plasma Sintered Si3N4/SiC Composites on Steel

Zeynep Taslicukur Ozturk

doi:10.3139/120.110660

Article

Dry Sliding Wear Mechanism of Spark Plasma Sintered Si₃N₄/SiC Composites on Steel

Zeynep Taslicukur Ozturk

Published/Copyright: November 20, 2014

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From the journal Materials Testing Volume 56 Issue 11-12

Abstract

In the present work, Si₃N₄-based composites were characterized by a relatively low friction coefficient in unlubricated sliding against a 100Cr6 steel ball. Si₃N₄-based composites containing different amounts of SiC were produced by spark plasma sintering at 1650 °C for 5 min with a uniaxial pressure of 40 MPa in a nitrogen atmosphere. In the wear test, the load, total distance and rotating speed were selected as 60 N, 120 m and 500 rpm, respectively. The wear tracks were examined by scanning electron microscopy (SEM) to estimate the wear mechanism. The results were evaluated using the friction coefficient-distance diagram. Si₃N₄-based composites showed significant decrement in wear by improving toughness with SiC powder reinforcement.

Kurzfassung

In den diesem Beitrag zugrundeliegenden Forschungsarbeiten wurden Si₃N₄-basierte Kompositwerkstoffe bei einem relativ niedrigem Reibungskoeffizient unter ungeschmiertem Gleiten gegen einen Ball aus 100Cr6 Stahl charakterisiert. Die Si₃N₄-basierten Komposite mit verschiedenen Mengen von SiC wurden durch Plasmafunkensintern bei einer Temperatur von 1650 °C für 5 min bei einem einachsigen Druck von 40 MPa in einer Stickstoffatmosphäre hergestellt. In dem Verschleißtest wurden die Last, der Gesamtabstand und die Rotationsgeschwindigkeit mit 60 N, 120 m und 500 U × min⁻¹ gewählt. Die Verschleißspuren wurden mittels Elektronenmikroskopie untersucht, um den Verschleißmechanismus abzuschätzen. Die Ergebnisse wurden mittels eines Reibungskoeffizient-Entferungs-Diagramms ausgewertet. Die Si₃N₄-basierten Komposite zeigten eine signifikante Abnahme des Verschleißes mit verbesserter Zähigkeit bei einer Verstärkung mit SiC-Pulver.

Keywords: Materials testing; silicon nitride; silicon carbide; spark plasma sintering; wear

*Correspondence Address, Assist. Prof. Dr. Zeynep Taslicukur Ozturk, Gedik University, Metallurgy and Materials Engineering, 34876, Cumhuriyet Mah.Kartal/Istanbul, Turkey. E-mail: ztasli@gmail.com

Dr. Zeynep Taslicukur Ozturk, born in 1981, received her PhD in 2010 from Yildiz Technical University, Istanbul, Turkey. Presently, she works as Assistant Professor in the Department of Metallurgical and Materials Engineering, Gedik University, Istanbul, Turkey. Her areas of interest focus on the synthesis of high-tech ceramics.

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Published Online: 2014-11-20

Published in Print: 2014-11-17

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https://doi.org/10.3139/120.110660

Keywords for this article

Materials testing; silicon nitride; silicon carbide; spark plasma sintering; wear