L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des

L'air Liquide, Soci&#xe9;t&#xe9; Anonyme Pour L'etude Et L'exploitation Des Proc&#xe9;d&#xe9;s Georges Claude

L'air Liquide, Societe Anonyme a Directoire Et Conseil De Surveillance Pour L'etude Et L'exploitation Des Procedes Georges Claude

Claude Bonet

Francois Coeuret

Jean-Marie Gauthier

Thierry Sindzingre

Denis Verbockhaven

Francois-Xavier Barbier

Sylvie Nowak

A method for producing a soldered joint between the metal balls present in either a ball grid array or a chip-scale package, and the receiving pads for a circuit printed on a substrate or the receiving pads of an integrated circuit. Solder cream or an adhesive flux is deposited on the receiving pads, which then have metal balls are placed on them so as to form an assembly. The assembly is placed in an oven so as to heat the metal balls above their melting point. The balls are then cooled at a rate around 5&#xb0; C./sec, so that the balls remain in their liquid state for a time period between 20 seconds to 65 seconds.

Method for making a solder between metallic balls of an electronic component and mounting lands of a circuit and soldering furnace therefor

A method for delivering at least two working gases from a common air supply comprising the steps of depleting the air in O,in order to obtain a first gas mixture having an O,content less than or equal to t,; delivering at least a portion of this first gas mixture as a first working gas; depleting another portion of this first gas mixture in O,in order to obtain the second gas mixture having an O,content less than or equal to t,, wherein t,is greater than t,; and delivering the second gas mixture as a second working gas.

Method and device for supplying several working gases, and its application to an installation for assembling electronic components

Process for producing an atmosphere for the manufacture of high performance composite parts, of the type wherein the atmosphere is used in an autoclave above a superposition of cutouts with fibrous structure impregnated with a thermosetting organic material disposed between a lower mold and an upper sealing covering member, the space between the covering member and the mold being under vacuum. The atmosphere is nitrogen gas prepared from raw nitrogen by separation from air through permeation or adsorption, incorporating a residual content of oxygen between 0.5% and 6%, with a low content of water vapor. Application for example to the manufacture of secondary and primary structures in aeronautical and space construction.

Process for producing an atmosphere for the manufacture of high

The present invention relates to a multilayer protective coating for a substrate and a process for protecting a substrate by the deposition of a continuous, transparent, amorphous, inorganic coating essentially comprising silicon, carbon, nitrogen, oxygen and hydrogen by means of a plasma. The invention also concerns the application of the coatings according to the invention in the protection of substrates and in particular against electrostatic charges.

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Paris, France

Claude Bonet