Molybdenum substrate thick film circuit
First Claim
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1. A method of making a large area multilayer printed circuit structure comprising:
- a. providing a substrate material made of molybdenum;
b. screen printing a first layer of dielectric material and allowing said dielectric to dry;
c. firing said first dielectric layer;
d. repeating steps b and c until the desired number of dielectric layers have been printed, said dielectric layers having an uppermost dielectric layer with a top surface;
e. screen printing a first conductor circuit over the top surface of the uppermost dielectric layer and allowing said first conductor to dry;
f. firing said first conductor, said first conductor having a top surface;
g. screen printing a second layer of dielectric material over the top surface of said first conductor and the uppermost layer of said first dielectric layers and allowing said second dielectric layer to dry;
h. firing said second dielectric; and
i. repeating steps e, f, g and h until the desired number of dielectric-conductor layers have been printed.
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Abstract
An improved multilayered circuit is disclosed comprising a molybdenum substrate with alternating layers of dielectric and conducting thick film materials deposited thereon. The molybdenum substrate has the advantages of being its own chassis, having a coefficient of thermal expansion that is well matched to the thick film materials and component ceramic chip carriers, and having a high thermal conductivity so as to act as its own heat sink.
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Citations
6 Claims
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1. A method of making a large area multilayer printed circuit structure comprising:
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a. providing a substrate material made of molybdenum; b. screen printing a first layer of dielectric material and allowing said dielectric to dry; c. firing said first dielectric layer; d. repeating steps b and c until the desired number of dielectric layers have been printed, said dielectric layers having an uppermost dielectric layer with a top surface; e. screen printing a first conductor circuit over the top surface of the uppermost dielectric layer and allowing said first conductor to dry; f. firing said first conductor, said first conductor having a top surface; g. screen printing a second layer of dielectric material over the top surface of said first conductor and the uppermost layer of said first dielectric layers and allowing said second dielectric layer to dry; h. firing said second dielectric; and i. repeating steps e, f, g and h until the desired number of dielectric-conductor layers have been printed. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification