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Abrasive and Sliding Wear Characteristics of Al-Si Cast Alloys Before and After Coating by Plasma Electrolytic Oxidation Process

  • Hakan Aydin , Ali Bayram and Agah Uguz
Published/Copyright: May 26, 2013
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Materials Testing
From the journal Materials Testing Volume 50 Issue 6

Abstract

The wear resistance of a series of Al-Si cast alloys with 5%, 8% and 11% silicon contents have been investigated after spheroidising heat treatments, and after coating these alloys by a plasma electrolytic oxidation (PEO) process for comparison. The alloys were subjected to wear tests by using SiC and steel counterfaces. The most remarkable observation is the increase in the wear resistance of the 5% Si containing alloy against SiC counterface, which is 70 times. However, the increase in the wear resistance is 5 times in the 11% Si containing alloy under same conditions, and only about 50% increase is observed when the counterface is steel. It is argued that, coating of these alloys by plasma electrolytic oxidation improves the wear resistance more effectively if the silicon content of the alloy is low, since the silicates (or aluminosilicates) in the coating layer has deleterious effect on wear resistance.

Kurzfassung

Im vorliegenden Beitrag werden Untersuchungen zum Verschleißwiderstand einer Reihe von Al-Si Gusslegierungen mit Siliziumgehalten von 5, 8 und 11% vorgestellt. Es wurden Vergleiche des Verhaltens der Legierungen im wärmebehandelten Zustand sowie nach Beschichtung mit dem plasma-elektrolytischen Oxidationsverfahren vorgenommen. Für die Verschleißuntersuchungen wurden SiC- und Stahlgegenflächen verwendet. Das bemerkenswerteste Ergebnis besteht in einer 70-fachen Zunahme des Verschleißwiderstandes der 5% Si enthaltenden Legierung gegen die SiC Gegenfläche. Unter denselben Bedingungen ist die Zunahme des Verschleißwiderstandes nur etwa fünffach bei der 11% Si enthaltenden Legierung. Nur etwa 50% Zunahme werden bei einer Stahlgegenfläche erreicht. Es wird ausgeführt, dass die Beschichtung dieser Legierungen durch das plasma-elektronische Oxidationsverfahren den Verschleißwiderstand effektiver verbessert, wenn der Siliziumgehalt niedrig ist, weil die Silikate (oder Aluminiumsilikate) in der Schicht einen schädlichen Einfluss auf den Verschleißwiderstand haben.

Hakan Aydin was born in 1976, Bursa, Turkey. He compled his primary and secondary education in Bursa. He graduated from department of Mechanical Engineering of Engineering and Architecture Faculty, Uludag University-Bursa, Turkey in 2000. He has worked as a Research and Teaching Assistant in Mechanical Engineering at Uludag Univesity since 2000. He received his PhD in Mechanical Engineering from Uludag University in 2008. His research focuses on boronizing of steels, heat treatment of steels, Al-alloys and their heat treaments, friction stir welding of the age- hardenable Al-alloys.

Prof. Dr. Ali Bayram was born in 1958 in Bursa, Turkey. He was graduated from Istanbul Technical University as a metallurgical engineer. He received his PhD in materials science from Uludag University in 1994. He is currently lecturer at the Mechanical Engineering Department of Uludag University. His current research interests are on Fracture characteristics of dual phase steels, Surface treatment and wear behaviour of steels and Structure and properties of Al-based alloys.

Prof. Dr. Agah Ugǎuz studied Metallurgical Engineering at the Technical University Istanbul and Materials Science at the Oxford University. Since 2002 he is Professor for Materials Science and Physical Metallurgy 2006 he became General Manager of the Science Park Ulutek.

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Published Online: 2013-05-26
Published in Print: 2008-06-01

© 2008, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Characterization of Thermal Oxides on Austenitic Stainless Steel
  5. Abrasive and Sliding Wear Characteristics of Al-Si Cast Alloys Before and After Coating by Plasma Electrolytic Oxidation Process
  6. Wear Resistance of Chromium- Nitride and Diamond-like Carbon Thin Hard Coatings
  7. Elution of Foundry Sand and Mould Mixture in Water
  8. Chemical Stability of Alumina Ceramics in Sulphuric Acid
  9. Terahertz-Wellen: Radiographie ohne Strahlengefährdung
  10. Intelligenter Zünderprüfplatz
  11. Von der DIN 50145 zur DIN EN ISO 6892
  12. Vorschau/Preview
  13. Vorschau
https://doi.org/10.3139/120.100888

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Characterization of Thermal Oxides on Austenitic Stainless Steel
  5. Abrasive and Sliding Wear Characteristics of Al-Si Cast Alloys Before and After Coating by Plasma Electrolytic Oxidation Process
  6. Wear Resistance of Chromium- Nitride and Diamond-like Carbon Thin Hard Coatings
  7. Elution of Foundry Sand and Mould Mixture in Water
  8. Chemical Stability of Alumina Ceramics in Sulphuric Acid
  9. Terahertz-Wellen: Radiographie ohne Strahlengefährdung
  10. Intelligenter Zünderprüfplatz
  11. Von der DIN 50145 zur DIN EN ISO 6892
  12. Vorschau/Preview
  13. Vorschau
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