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Effect of NH4H2PO4 Content on Properties of the Mullite-Based Investment Materials

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Abstract:

The relationships between NH4H2PO4 content and properties including apparent porosity, bulk density, compressive strength, setting expansion and thermal expansion of the mullite-based investment materials have been investigated. The results show that: With increment of NH4H2PO4 content, the bulk density decreases and the apparent porosity increases for the specimens. When the NH4H2PO4 content is less than 9 mass%, the compressive strength of the specimens clearly decreases with increment of NH4H2PO4 content, and the compressive strength of the specimens heated at 900°C is less than that of the specimens heated at 110°C slightly. With increment of NH4H2PO4 content, the setting expansion obviously increases and the thermal expansion decreases a little.

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Periodical:

Advanced Materials Research (Volumes 163-167)

Pages:

4508-4511

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.163-167.4508

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Online since:

December 2010

Authors:

Gui Lin Yu, Nan Li, You Sheng Li, Yi Ning Wang

Keywords:

Compressive Strength, Investment Material, Setting Expansion, Thermal Expansion

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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