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An additional measure to ensure unidirectional solidification in dental casting
Author(s) -
Stevens L.
Publication year - 1983
Publication title -
australian dental journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.701
H-Index - 71
eISSN - 1834-7819
pISSN - 0045-0421
DOI - 10.1111/j.1834-7819.1983.tb01066.x
Subject(s) - lagging , superheating , shrinkage , porosity , materials science , casting , metallurgy , composite material , mathematics , thermodynamics , statistics , physics
A bstract — Ingates to mould spaces were related in dimensions and position to the production of shrinkage porosity due to poor heat transfer at a low pressure melt‐mould interface. A number were lagged with investment modified by the addition of diatomite. The frequency with which shrinkage porosity occurred in the low pressure area significantly increased with lagging. This was attributed to the melt having greater superheat on entering the mould due to lagging. It was concluded that lagging of ingates could be used as an additional method to ensure unidirectional solidification.