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International Journal of Metalcasting

, Volume 12, Issue 4, pp 765–771 | Cite as

Development and Evaluation of a New Eco-friendly Sodium Silicate-Based Binder System

  • Necip Ünlü
  • Ahmet Odabaş
Article
  • 93 Downloads

Abstract

Although sand systems containing Na-silicate binder present several environmental and economic advantages, technological applications are restricted due to their poor knock-out properties and low moisture resistance. Thus, many investigations have been performed recently to eliminate these undesirable handicaps of Na-silicate binder. In this study, the technological importance of a recently developed Na-silicate binder with a liquid hardener and its applicability in a mold/core system have been investigated. Further, a casting trial of a tank rear idler wheel has been performed by using the molds prepared with the current Na-silicate binder, and the observations have been evaluated. It has been determined that using Na-silicate binder results in more important advantages and benefits such as shorter period (10 s) for CO2 application, sound mold surface without cavity, good gas permeability, long shelf-life at high moisture environment (90% moisture at 23 °C for 24 h), and achieving silica sand-based mold/core systems with superior shakeout property than that of the conventional ones. It has been observed that the preparation of molds with the current Na-silicate binder hardened by CO2 process and the liquid Na-silicate hardener provides a practically odorless and fast process, and outstanding casting quality during the trials.

Keywords

Na-silicate binder foundry core molding 

Notes

Acknowledgements

Alazan Casting Chemicals & Industry Metal Inc. Co. is gratefully acknowledged for permission to publish this work. Corresponding author would like to thank the Editor and Reviewers of the International Journal of Metalcasting due to their highly valuable critical comments. Authors are also grateful to Anadolu Steel Casting Inc.Co., Kocaeli, Turkey, for their help during the casting trials of this study.

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Copyright information

© American Foundry Society 2018

Authors and Affiliations

  1. 1.Metallurgical and Materials Engineering DepartmentIstanbul Technical UniversityMaslak, IstanbulTurkey
  2. 2.Alazan Casting Chemicals and Industry Metal Inc. Co.GebzeTurkey

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