Method of preparing a durable air-permeable mold

Details Method of preparing a durable air-permeable mold Method of preparing a durable air-permeable mold

B - Operations, Transporting

22

C

B22C 1/00 (2006.01) B22C 9/06 (2006.01) B22F 3/22 (2006.01) B22F 5/00 (2006.01) B29C 33/38 (2006.01)

Patent

CA 2122940

A Method of Preparing a Durable Air-permeable Mold Abstract A method of preparing a durable air-permeable mold having dimensional accuracy and without cracks due to the segregation of the ingredients of the aggregate and without a surface irregularity, which comprises compounding 100 parts by weight of an aggregate obtained by compounding metal powders with metal oxide powders in a weight ratio of 5:95 to 30:70, the metal of said metal oxide powders being the same as that of the metal powders, 80% or more of said metal powders and said metal oxide powders having grain sizes of 300 m or less, with 10 to 35 by weight of an auxiliary hardening material that is softened and melted during the sintering process, and 10 to 25 by weight of a binder that contains an evaporable component, mixing them to form a slurry mixture, pouring it in a pattern mold to obtain a mold, drying the thus-obtained mold, and sintering the dried mold in an oxidative atmosphere at a temperature of 600 to 1200°C.

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