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US 4,543,116 AGranted
Welding and fluid tightness process for the production of sensors
AssigneeRegie Nationale des Usines Renault
InventorsClaude Lombard, Olivier Morvan
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Abstract
A process for producing pressure sensors and other similar devices in which a fluid-tight bond between a sealing glass and another material is obtained under the effect of the application of heat and an electric field. The process is characterized in that the parts to be assembled float on the surface of a molten metal bath. The bath is positioned in a chamber within which a partial vacuum prevails.
Claims6
A process for sealing a silicon layer to at least a face of a layer of the vitrocrystalline material, which comprises:
- stacking the silicon layer and the vitrocrystalline material layer together on the surface of a liquid metal bath so that a lower layer of said layers floats on a surface of said bath;
- placing said bath and said layers within an enclosure;
- heating said metal bath;
- reducing the pressure within said enclosure;
- and
- establishing a direct-current voltage between said metal bath and an upper layer of said layers so as to form an electrostatic seal between the layers.
3 more elements
Dependencies are inferred from the claim text.