Electrically conductive material and method for making

Details Electrically conductive material and method for making Electrically conductive material and method for making

1996-11-26

1998-12-08

Jenkins, Daniel J.

Specialized metallurgical processes, compositions for use therei

Compositions

Loose particulate mixture containing metal particles

75247, 419 11, 419 18, 419 21, 419 22, 419 28, 419 38, 419 66, 428570, 148431, B22F 102, B22F 316, B22F 904, B22F 916

Patent

active

058462880

ABSTRACT:
Electrical contact material made from intimate mixtures of silver powder and a powder of a second phase material is shown in which the powder of the second phase material is milled to produce a selected grain distribution of approximately 90% less than 7-10 microns, approximately 50% between 2 and 5 microns and approximately 10% less than 0.8 to 1.0 microns. The powder of the second phase material is added to a silver salt solution, ammonium hydroxide and hydrazine hydrate to form a precipitate of second phase material particles covered with silver. For applications in which the particles need to be free flowing the particles are compacted together without any binder, broken into chunks and milled to provide granules. In one embodiment homogeneously doped tin oxide particles are disclosed in which tin oxide and the oxide of the dopant are dissolved in nitric acid to produce finely dispersed tin oxide and dopant oxide. The oxides are calcined and ground to the selected grain size distribution.

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