US 5,976,454 A · Process for producing open-celled, inorganic sintered foam products

Abstract

A process for producing open-celled, inorganic sintered foam products which comprises: a. converting slip material comprising sinterable inorganic powder, a fluid, vaporizable material which makes this slip material capable of flow and, if desired, a material forming blowing gas into a foamed product in a foaming step with liberation of the blowing gas, b. subjecting this foamed product to a treatment which essentially makes the slip material incapable of flow and forms an open-pored intermediate body, with the steps a. and b. being able to proceed essentially simultaneously, c. removing material remaining from the fluid material and any further material from the intermediate body to form a green foam body, and d. sintering the green foam body to form the open-celled, inorganic sintered foam product.

Claims10

Dependent claims

A process for the preparation of an open-cell, inorganic sintered foam product, wherein

a) sinterable, inorganic powder, a fluid vaporizable material which renders this flowable and, if required, a material forming a blowing gas are mixed with one another to give a slip and the slip is subjected to continuous positive conveying,
b) the positively conveyed slip is subjected continuously to a pressure generation stage so that the vaporizable material vaporizes at least partially, but essentially without volume change and with a pressure increase in the slip, and a slip under pressure is thus formed,
c) the slip under pressure is expanded continuously into a volume under lower pressure than that of the slip pressure, with formation of a slip foam,
d) the slip foam is converted into a green foam element and
e) the green foam element is sintered to form the sintered foam product.

2 more elements

Dependencies are inferred from the claim text.

Process for producing open-celled, inorganic sintered foam products

Life of this patent

Process for producing open-celled, inorganic sintered foam products

Life of this patent

Abstract

Claims10