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.
Original language | English |
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Pages (from-to) | 765-771 |
Number of pages | 7 |
Journal | International Journal of Metalcasting |
Volume | 12 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Oct 2018 |
Bibliographical note
Publisher Copyright:© 2018, American Foundry Society.
Keywords
- binder
- core
- foundry
- molding
- Na-silicate