Schott Ag

Schott Glas

Andreas Steinberg

Oliver Wolfgang Fritz

Joern Besinger

Claudia Zimmerer

The method produces powder particles that are uniformly coated with functional groups. It includes homogenizing, in an agitator mill, a suspension of glass, quartz, glass ceramic, and/or ceramic particles in a suspending agent together with a coating agent, so that the particles in the suspension react with the coating agent in the agitator mill to form the uniformly coated powder particles with functional groups. Preferably a weight ratio of the suspending agent to the particles is from 0.5:1 to 5:1. The suspending agent is preferably an aqueous solvent and the coating agent is preferably a silane. The uniformly coated powder particles have a particle size (d) of less than 2 &#x3bc;m, have a specific surface of 5 to 40 m/g, and are free of agglomerates.

Powder particles that are uniformly coated with functional groups, method for their production and use thereof

To hermetically seal a fiber optic light guide ( ) in a stripped or de-coated state, I.e. the bare optical fiber ( ), in a feedthrough sleeve ( ) the bare optical fiber ( ) is sealed together with the feedthrough sleeve ( ) by composite-glass solder with local heating. To make a permanent hermetic glass seal, the feedthrough sleeve ( ) is made from an Invar alloy with very low thermal expansion and the composite-glass solder is low-melting with thermal expansion properties adapted to the alloy. The composite-glass solder is molded into prefabricated half-cylinder-shaped pressed parts ( ) in a press/sinter technology process, The stripped optical fiber ( ) is inserted between the pressed parts ( ) arranged in the feedthrough sleeve ( ) and sealed by melting the pressed parts together with each other and with the stripped optical fiber and feedthrough sleeve.

Method of hermetically sealing a fiber optic light guide in a metallic feedthrough sleeve with glass solder and hermetically sealed feedthrough device made thereby

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Vilsheim, Germany

Andreas Steinberg