The Measurement of High-Temperature Expansion as the Standard of Estimation the Knock-Out Properties of Moulding Sands with Hydrated Sodium Silicate

The necessity of receiving high quality castings forces undertaking research to elaborate moulding and core sands ensuring obtaining the materials with relevant technological parameters and also with high environmental standards. The most important group here are moulding sands with hydrated sodium...

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Veröffentlicht in:Archives of metallurgy and materials 2014-01, Vol.59 (2), p.739-742
Hauptverfasser: Major-Gabryś, K., Dobosz, S.M., Jelínek, P., Jakubski, J., Beňo, J.
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container_issue 2
container_start_page 739
container_title Archives of metallurgy and materials
container_volume 59
creator Major-Gabryś, K.
Dobosz, S.M.
Jelínek, P.
Jakubski, J.
Beňo, J.
description The necessity of receiving high quality castings forces undertaking research to elaborate moulding and core sands ensuring obtaining the materials with relevant technological parameters and also with high environmental standards. The most important group here are moulding sands with hydrated sodium silicate. Unfortunately, their fundamental disadvantages are weak knock-out properties. The article presents the most commonly used methods of measuring the knock-out properties of moulding and core sands. The authors propose a new method for estimation this parameter. The method is based on the measurement of high-temperature expansion. Potrzeba uzyskiwania wysokiej jakości odlewów wymusza podejmowanie prac badawczych dla otrzymania mas formierskich i rdzeniowych zapewniających uzyskanie tworzyw o odpowiednich parametrach technologicznych, jednocześnie spełniających wysokie wymogi ochrony środowiska. Najważniejszą grupę stanowią tutaj masy z uwodnionym krzemianem sodu. Niestety jedną z ich podstawowych wad jest słaba wybijalność. W artykule zostały przedstawione najczęściej stosowane metody pomiaru wybijalności mas formierskich i rdzeniowych Autorzy zaproponowali nową metodę oceny wybijalności opierającą się na pomiarze ekspansji wysokotemperaturowej.
doi_str_mv 10.2478/amm-2014-0123
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subjects hydrated sodium silicate
knock-out properties
moulding sand
title The Measurement of High-Temperature Expansion as the Standard of Estimation the Knock-Out Properties of Moulding Sands with Hydrated Sodium Silicate
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