Thomson-csf

Antoinette Morell

Nathalie Goumard

Jean Nicolas

Annie Marx

Antonio Hermosin

A method for the manufacture of a luminophore comprising the following steps:

Method for the manufacture of a luminophore

A phosphor material based on manganese-doped zinc silicate, in which the manganese doping level ranges from 3.5% to 25%, can be used to obtain a very short time of decay after excitation. Applications: display panels and television tubes.

Phosphor material based on manganese-doped zinc silicate and method for

A phosphor material based on manganese-doped zinc silicate, in which the manganese doping level ranges from 3.5% to 25%, can be used to obtain a very short time of decay after excitation.

A process for rapidly sintering ceramic components, in particular of the type utilized in electronics (ferrites), which reduces the sintering time by a factor of from ten to one hundred, reducing the volume of the kiln and resulting in a considerable saving in electric power. In this process the unbaked components previously shaped by pressing with a binder are sintered without carrying out the prior heat treatment of elimination of the binder. The sintering is made according an accurate curve of temperature as concerns the slopes of the rising and descending parts of the curve. The maximum of the curve exceeds by from 100.degree. C. to 300.degree. C. the normal temperature of sintering in the conventional method. The kiln, which is of the passage type with a conveyer belt sliding on rods of alumina, has six heating zones regulated by a thermocouple and a feedback loop pertaining to each zone so as to achieve a heating profile with a high accuracy.

Process for the rapid sintering of ceramic components and a kiln for

A method of manufacturing a magnetic head, with a relatively large gap for reading, for instance, magnetic cards, and having a good resistance to mechanical wear, is provided. The head comprises two members with flat and parallel faces, made of a spinel ferrite having a high Curie temperature, encompassing a layer of non magnetic ferrite, 10 to 50 micrometers in thickness, deposited by silk-screen printing on one or both of the mutually opposite flat faces. The assembly is then bonded by sintering under pressure.

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Villebon S/Yvette, France

Antoinette Morell