Effect of Additives on Heat Hardened Inorganic Solid Foundry Binder

Nurul Anwar*, Katarzyna Major-Gabryś, Kalle Jalava, Juhani Orkas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Renewed interest in inorganic binders for sand molding has also intensified research on different forms of it. In this study, solid inorganic sodium silicate binder was tested with different additives to see how these affected the silica mold quality. The five additives used were: glucose, sucrose, boric acid, aluminum oxide and iron(III)oxide powders. The mold quality was assessed through tests like bending strength, tensile strength, hot distortion, wear resistance, gas evolution and collapsibility tests. In addition, SEM imaging was done on some select mold fracture samples. In the end, a casting trial was carried out followed by a surface roughness and defects analysis. A reduction in mold strength was noticed with glucose and boric acid, while collapsibility was improved by glucose, sucrose and boric acid additives. Casting trials have shown the best surface finish to be obtained with sucrose additive. All the casts in general showed some penetration; however, repeat casts have proven that altering some casting parameters could result in casts with excellent surface finish using solid silicates.
Original languageEnglish
Number of pages16
JournalINTERNATIONAL JOURNAL OF METALCASTING
DOIs
Publication statusE-pub ahead of print - 2 Mar 2024
MoE publication typeA1 Journal article-refereed

Keywords

  • additives
  • foundry binder
  • inorganic
  • solid silicates
  • sustainable molding

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