Leybold Aktiengesellschaft

Leybold Vakuum Gmbh

Oerlikon Leybold Vacuum Gmbh

Josef Heppekausen

Hans-Peter Kabelitz

Ralf Steffens

Karl-Heinz Ronthaler

Michael Froitzheim

Frank Schulte

The invention relates to a process for the coating of objects made of valve metals selected from aluminum, magnesium, titanium, niobium and/or zirconium and their alloys with an oxide ceramic layer formed from the metal which has a thin barrier layer as a boundary layer towards the metal whose surface has been coated with polymers, characterized in that said polymers are introduced into the capillary system of the oxide ceramic layer in the form of dimers or halogenated dimers of general formula I 

Coated articles

The present invention relates to a process for the coating of objects made of valve metals or their alloys with a thin barrier layer consisting of the metal and an oxide ceramic layer provided thereon whose surface has been coated with fluoropolymers, characterized in that the fluoropolymers are introduced into the capillary system of the oxide ceramic layer in the form of a solution by vacuum impregnation, followed by removing the non-wetting portions of the solution and drying.

Coating of objects

A dual-shaft machine comprising a housing, two pistons rotatably mounted in the housing leaving a cold play spacing between one another and said housing, and a coating provided on either the housing or the pistons, or both, to reduce the cold play spacing to that required by the intended field of use of the machine.

Method of making a dual-shaft machine

Growing community of inventors

Wesseling, Germany

Josef Heppekausen