Method of making a casting mould having a cellular structure

Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials

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264635, 264636, 264221, B29C 6500

Patent

active

061207136

ABSTRACT:
A method of making a ceramic casting mould contains forming a contact layer on a disposable wax-type pattern of the article to be cast, placing the pattern in a preparation mould for defining the outer shape of the casting mould and filling the cavity formed between the pattern and the preparation mould with a ceramic slip which expands to form a coherent cellular foam adhering to the surface of the pattern, removing the pattern and adhered foam from the preparation mould after from 5 to 30 minutes, eliminating the pattern to leave a casting mould formed by the contact layer and the adhered foam, and then firing the casting mould to strengthen said mould. Ceramic slip compositions are also described.

REFERENCES:
patent: 4158685 (1979-06-01), Masaryk
patent: 4356271 (1982-10-01), Francis et al.
patent: 4575439 (1986-03-01), Hintzen et al.
patent: 4844148 (1989-07-01), Cuisin et al.
patent: 5422055 (1995-06-01), Yalvac et al.

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