PROCESS FOR THE PRODUCTION OF SINTERED MOLDINGS
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Abstract
The present invention relates to an improved process for the production of sintered moldings by molding a mixture of a sinterable ceramic or metallic powder and polyoxymethylene or a copolymer containing a majority of oxymethylene units as binder to give a compact, removing the binder from the compact by treatment with a gaseous acid, and sintering the resulting molding.
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Citations
19 Claims
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1-8. -8. (canceled)
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9. A process for the production of sintered moldings which comprises:
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molding a mixture comprising A a sinterable metallic powder and B1 polyoxymethylene or a polyoxymethylene copolymer having at least 50 mol % of —
CH2O—
repeat units in the main polymer chain as binder to give a compact, removing the binder from the compact by treatment with a gaseous or liquid acid to obtain a molding, and sintering the molding,wherein the acid is selected from methanesulfonic acid or a solution of methanesulfonic acid, oxalic acid or mixtures thereof in a solvent, selected from water, C1-4-carboxylic acids and mixtures thereof, wherein as component B1 a thermoplastic composition comprising from 10 to 90% by weight of a polyoxymethylene homo- or copolymer with a weight-average molar mass (MW) in the range from above 60 000 to 200 000 g/mol as component B1.1 and from 10 to 90% by weight of a polyoxymethylene copolymer with a weight average molar mass (MW) in the range from 10 000 to 60 000 g/mol, as component B1.2, is employed, the molecular weights being determined by way of gel permeation chromatography. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification