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Cost Effective use of Gold in Thick Film Conductors
Keywords: Gold powder, thick film conductor, high reliability
Gold is a noble element with the symbol Au and it is part of the transitional metal group with the atomic number of 79. It is a precious metal thats been desired since the beginning of history. It is well documented in the history books that gold is been used in sculptures, jewelry, and coins. The modern uses for gold include dentistry, decorative and electronics. The scope of this paper is the use of different forms of gold in thick film pastes for electronics. Gold can be made into a powder form, which is ideally suited for thick film pastes, by using chemical precipitation process with different shapes and partial sizes as well as into gold resinates and metal-organic complexes. Gold powder and resinates are used to make thick film paste for screen printing application with optimize back light density. Although gold is more expansive than other precious metals it provides a stable and reliable fired film. Fired films produced made from gold conductors do not suffer from migration because gold does not easily form a free Au ion. Gold thick film conductor pastes in general are used in high reliability applications such as military, high frequencies, interconnection- microwaves and medical. Data and information is presented to show the wide uses of gold in thick film conductor paste with reliable results. This data includes fired film density, resistivity, and wire bond adhesion. Key words: Thick film, gold conductor, wire bonding, high reliability, lead and cadmium free
Samson Shahbazi, Sr. Research Scientist
Heraeus, Thick Film Materials Division
W. Conshohocken, PA

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