Method for producing metal powder with a uniform distribution of

Details Method for producing metal powder with a uniform distribution of Method for producing metal powder with a uniform distribution of

1992-04-28

1994-03-22

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

148411, 252512, 264 58, 501 11, 419 32, 419 10, B22F 700

Patent

active

052961893

ABSTRACT:
Methods of fabricating powders of metal particles containing grain growth control additives are described. A powder, metal particles, e.g., copper particles, are mixed with a powder of additive particles, e.g., alumina particles. The mixture is milled in a high energy ball mill to provide metal particles having substantially uniformly distributed therein of additive particles. The ball milled powder contains elongated high aspect ratio particles. The high aspect ratio particles are reduced in size by jet impact milling. The jet impact milled powder can be used to form a conductor forming paste in the fabrication of a metallized ceramic substrate for semiconductor chip packaging application. The jet impact milled powder has particles of sufficiently small in size to fill vias between metallization layers in the green ceramic precursor to the ceramic substrate. During sintering of the combination of ceramic precursor and conductor forming paste, the grain growth control additive results in a substantially void free via filled with metal having a fine grain morphology.

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