Resources Contact Us Home
Process for bonding copper or copper-chromium alloy to ceramics, and bonded articles of ceramics and copper or copper-chromium alloy

Image Number 4 for United States Patent #4500383.

A process for bonding a copper or copper-chromium alloy body and a ceramic body of components of an electrical or electronic device to each other includes a step of directly sandwiching a layer of chromium oxide between the ceramic and copper or copper-chromium bodies, a step of heating a temporary assembly of the ceramic and copper or copper-chromium alloy bodies and the layer of chromium oxide, under an atmosphere which can oxidize chromium without oxidizing copper, at a temperature of at least C. but below the melting point of copper or the alloy, and then a step of slowly cooling the resulting bonded assembly. In particular, in a process for bonding the alloy body to the ceramic body, the chromium oxide sandwiching step is performed concurrently with the temporary assembly heating step. The bonding process can produce a hermetic envelope, particularly a vacuum envelope of a vacuum interrupter. The process for bonding the copper or alloy body to the ceramic body of this invention is more advantageous than bonding processes employing the so-called Telefunken method, in terms of cost and steps.

  Recently Added Patents
Fire detector
High productivity single pass scanning system
Wafer level packaging structure with large contact area and preparation method thereof
Computer implemented apparatus for generating and filtering creative proposal
Battery structures and related methods
Method to prevent hyper frame number de-synchronization in a wireless communication system
Supply voltage generating circuit and semiconductor device having the same
  Randomly Featured Patents
Method of depositing dielectric films
Detachable-body vehicle frame
Constant velocity joint with improved profile
Fluorescence detection enhancement using photonic crystal extraction
System and method for monitoring radial motion of a rotating shaft of a turbocharger
Microprocessor with resetting circuit arrangement
Nuclear magnetic resonance imaging method
Fiber optic cable support
Dental router
Method of direction-guidance using 3D sound and navigation system using the method