Effect of Additions on Properties of the Mullite-Based Investment Materials

Abstract:

Additives will affect directly the clinic operational properties of investment materials, and finally affect the quality of castings. The relationship between additions and properties of the mullite-based investments has been studied. This paper describes effect of HBO3, Na5P3O10 and (NaPO3)6 on properties (including fluidity, initial setting time and compressive strength) of the mullite-based investment materials.It is found that with addition of HBO3, the fluidity of the mullite-based investment materials improves greatly, the initial setting time prolongs, and the compressive strength of investment materials changes little；with addition of Na5P3O10, the fluidity of mullite-based investments improves greatly, the compression strength increases, and the amount of silica gel decreases clearly；with addition of (NaPO3)5, the fluidity of mullite-based investments increases, the initial setting time prolongs, the compression strength decreases, and the amount of silica gel decreases clearly.

• Periodical: Key Engineering Materials (Volumes 467-469)
• Pages: 934-939
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.467-469.934
• Online since: February 2011
• Authors: Gui Lin Yu, Nan Li, You Sheng Li, Yi Ning Wang
• Keywords: Compressive Strength, Fluidity, Initial Setting Time, Investment Material

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