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US 4,424,280 AGranted
Ceramic foams and process of preparing the same
AssigneeCentre de Recherche Industrielle du Quebec
InventorHenri-Bernard Malric
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AssigneeCentre de Recherche Industrielle du Quebec
InventorHenri-Bernard Malric
Estimating the term…
The disclosure describes ceramic foams, for example made of clay, and a process for preparing these foams. Once there is obtained a mixture defining a slip, the latter is caused to be foamed by the addition of controlled quantities of a gas, such as air, thus making it possible to reproduce foams having predetermined physical properties. It is preferable to dry the foam under conditions where the temperature is heterogeneous and in the absence of ventilation. This operation can be carried out by placing the foam under heating elements at a temperature between 30.degree. C. at the start to 100.degree. C. towards the end of the drying, while practically preventing any ventilation in the vicinity of the foam. This process is mainly advantageous in that it enables one to control the physical properties of the foam obtained thereby. This foam can be used as an industrial absorbent, acoustical insulating material, fire-wall, thermal insulating material, etc. by varying the density of the foam.
A process for preparing a clay foam in which a slip is prepared which is thereafter foamed, dried and baked, which comprises mechanically stirring the slip merely sufficiently to provide homogeneous conditions thereon, and controlling said stirring so as to prevent the introduction thereby of substantial quantities of ambient air into said slip, and independently of the introduction of any quantity of ambient air by said mechanical stirring, simultaneously introducing essentially within said slip in movement controlled quantities of a gas thereby ensuring the reproductiveness of a foam having predetermined physical properties, said slip being self flowing at the end of said process, said process being further characterized by drying the foam under conditions where temperature is heterogeneous around said foam and ventilation is practically prevented in the vicinity of said foam.
A process for preparing a clay foam, comprising the following steps:
Dependencies are inferred from the claim text.