Bbc Brown, Boveri & Company, Limited

Babcock-brown Boveri Reaktor Gmbh

Alfred Jester

Hubert Holick

Robert E Womack

William E Lawrie

Elmar Mueller

A large area semiconductor disk, wherein in order to be able to connect, for example, by soldering, welding or diffusion-bonding the semiconductor disk with copper disks serving for the heat conduction and for the current supply, a copper tape wound to form a spiral is used to make the connection between the two disks. Transverse slots are etched or punched into the copper tape so that free V-shaped crosspieces are formed on one side. The ends of the cross-pieces are connected with the silicon disk, and measures are taken so that the crosspieces do not connect with each other. The other side of the wound tape is soldered to the copper disk. The radial thermal expansion differences between the copper disk and silicon disks, as well as the axial thermal expansion differences between the silicon disk and the casing, as well as production tolerances in the planeness of the copper and silicon disks are absorbed elastically by the corresponding V-shape of the crosspieces.

Spiral strip brushlike stress buffering power semiconductor contacts

On the two main surfaces of a semiconductor disc of a large diameter, high-performance semiconductor component, there are soldered one bundle each of metal wires. The other ends of the metal wires are soldered to heat dissipating discs. The metal wires, with increasing distance from the center, are of increasing lengths in order to absorb the differences in the thermal expansion of the semiconductor disc and the heat dissipating discs. Metal ring portions and a ceramic housing complete the semiconductorcomponent. A secure and desirable contact of the semiconductor discs is achieved without the application of pressure.

High performance semiconductor component with heat dissipating discs

Defects in the fuel rods of nuclear fuel assemblies are ascertained and located by ultrasonic means. The fuel assemblies are subjected to ultrasonic waves. Differences in fuel rod resonance is indicative of defective rods.

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Speyer, Germany

Alfred Jester