Degussa Aktiengesellschaft

Demetron Gesellschaft Fuer Elektronik-Werkstoffe M.b.h.

Dieter Kaufmann

Wolfgang Weise

Willi Malikowski

Harald Krappitz

Alexander Voelcker

Joerg Beuers

Jurgen Hausselt

Georg Ptaschek

Wolfgang Kaster

Udo Englisch

Stephan-U Schittny

Juergen Hausselt

Sigurd Joensson

Cadmium-free hard solders having working temperatures of less than 630&deg; C., which are easily workable and yield ductile soldered joints, are composed of 30 to 60% by weight of silver, 10 to 36% by weight of copper, 15 to 32% by weight of zinc, 0.5 to 7% by weight of gallium, 0.5 to 7% by weight of tin and 0 to 5% by weight of indium.

Cadmium-free silver alloy as low-melting brazing filler material

Cadmium-free brazing solders with working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 14 to 25 wt. % copper 10 to 25 wt. % gallium, 1 to 7 wt. % zinc and 0 to 5 wt. % indium and/or tin. The alloys have good cold workability and ductility.

Cadmium-free silver alloy brazing solder, method of using said solder,

Cadmium-free brazing solders which also have working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 5 to 25 wt. % copper, 10 to 25 wt. % gallium, and 0.1 to 5 wt. % indium and/or tin.

Use of silver alloys as cadium-free brazing solder

Cadmium-free brazing solders with working temperatures under 630.degree. C. containing 45 to 80 wt. % silver, 5 to 13 wt. % copper, 10 to 25 wt. % gallium, 8 to 20 wt. % zinc, and 0 to 5 wt. % indium and/or tin.

Use of a cadmium-free silver alloy as brazing solder (III)

A method for working high-purity, mechanically strong targets containing brittle phases in the equilibrium state. First a porous body is manufactured from part of the component with a higher melting point and thereafter the porous body is impregnated with an impregnating composition corresponding to the remainder of the components required to form the ultimate composition of the target. The composition of the impregnation material must be selected in such a manner that the reaction between the impregnation material and the porous body shall produce no phases of low melting points.

Method for making targets

As replacements for noble metal containing alloys fused to porcelain in dental prosthetics there are needed alloys based on cobalt-chromium-tungsten which have a hardness of less than 300 (HV 5), can be veneered faced with known dental ceramics without problems and can be worked without problem with the customary working techniques. Such alloys contain in addition to 42-69.5 weight % cobalt, 10-35 weight % chromium, and 5-25 weight % tungsten, 2-10 weight % iron, 1-4 weight % aluminum, 0-5 weight % rhenium, and 0-2 weight % titanium, whereby the sum of the content oc chromium, tungsten, and rhenium is between 27.5 and 45 weight % and the sum of aluminum and titanium is below 5 weight %.

Growing community of inventors

Birstein, Germany

Dieter Kaufmann