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AssigneeECET--Europeene de Conception et d'Etudes Technologiques
InventorsFrançois Collardey, Aurélien Jankowiak, Philippe Blanchart, Dominique Laigneau
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Method for preparing a semi-conductive ceramic material, wherein: in a receptacle containing a liquid, there are mixed from 30 to 90% of a conductive phase based on Z1-xMxCrO3 for 0≦×≦0.3, with Z being an element of the lanthanide group or a mixture of elements of this type, and M being calcium, strontium, magnesium, aluminum, titanium, yttrium or a mixture of two or more of these elements; from 8 to 60% of an insulating phase based on fine grains of alumina or tabular alumina or mullite or a mixture of two or more of these compounds; and from 0 to 10% of sintering additives; operations are carried out for milling, drying and sieving this mixture; this mixture is pressed; and this mixture is sintered in order to obtain a ceramic material having a porosity less than or equal to 25%.
Method for preparing a semi-conductive ceramic material, characterised in that:
Semi-conductive ceramic material, characterised in that it comprises from 30 to 90% by weight of a conductive phase based on a compound of the type Z1-xMxCrO3 for 0≦X≦0.3, Z being able to be an element of the lanthanide group or a mixture of elements of this type, and M being able to be calcium, strontium, magnesium, aluminium, titanium, yttrium or a mixture of two or more of these elements, from 8 to 60% by weight of an insulating phase based on alumina or mullite or a mixture of these compounds or the high temperature reaction products thereof, and from 0 to 10% by weight of sintering additives or the high temperature reaction products thereof, and in that the porosity thereof is less than or equal to 25%.
Dependencies are inferred from the claim text.