Method for producing refractory composite particles and feeder elements for the foundry industry, corresponding feeder elements and uses

US10919086B2 · kind B2 · utility

Assignee

• HÜTTENES-ALBERTUS CHEMISCHE WERKE GESELLSCHAFT MIT BESCHRÄNKTER HAFTUNG · DE

Inventors

• Sandra LEHMANN · Potsdam, DE
• Klaus RIEMANN · Wunstorf, DE
• Nils ZIMMER · Garbsen, DE
• Hermann LIEBER · Langenhagen, DE
• Jürgen HÜBERT · Langenhagen, DE

Key dates

• Filing date: Dec 1, 2016
• Grant date: Feb 16, 2021
• Expiry date: Mar 4, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2111/40
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A method for producing a feeder element is described. The method includes (a) producing composite particles having a particle size of less than 2 mm in a matrix encapsulation method with the following steps: (a1) producing droplets of a suspension from at least (i) one or more refractory substances, (ii) one or more of fillers having a bulk density in the range from 10 to 350 g/L, expandants, and pyrolysable fillers, (iii) as continuous phase, a solidifiable liquid, (a2) solidifying the droplets with the refractory substance(s) and density-reducing substance(s) are encapsulated therein, (a3) treating the hardened droplets to form composite particles, (b) mixing the composite particles with a binder and, optionally, further constituents to give a feeder composition, (c) shaping and curing the feeder composition to give a feeder element. Also described are a method for producing refractory composite particles and the use of the composite particles.