COMPOSITION, CORE AND MOULD FOR CASTING AND MOULDING PROCESSES
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United States of America Patent
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Issued Date -
Dec 14, 2023
app pub date -
Oct 25, 2021
filing date -
Oct 23, 2020
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Abstract
A composition for making a core for use in a moulding or casting process, a core comprising said composition, and a mould for producing an article by high pressure die casting or semi-solid casting. The composition comprises a particulate refractory material, a binder composition comprising at least one hydrophilic polymer, comprising at least one polysaccharide or polysaccharide derivative; and at least one pozzolanic additive. The mould comprises a core for defining an internal cavity of the article and the core comprises a solidified core composition. The solidified core composition comprises a particulate refractory material and a binder composition, degrades in water such that a cylinder of the solidified core composition having a maximum height of 80 mm and a maximum diameter of 50 mm disintegrates in no more than 10 minutes when immersed in water at a temperature of 20° C. and stirred at a speed of 60 rpm, and has a flexural strength of at least 300 N/cm2. The invention also resides in a method for producing an article by high pressure die casting or semi-solid casting.
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