Process for the manufacture of thick layer varistors on a...

Details Process for the manufacture of thick layer varistors on a... Process for the manufacture of thick layer varistors on a...

H - Electricity

01

C

356/114

H01C 17/06 (2006.01) H01C 7/108 (2006.01) H01C 17/065 (2006.01)

Patent

CA 1197022

ABSTRACT OF THE DISCLOSURE The invention relates to a process for the manufact- ure of non-linear resistors (varistors) from thick-layer ceramic material, in particular on a hybrid circuit substrate, or any other device requiring that a predeter- mined temperature should not be exceeded during its manufacture. According to the invention, after crushing a ceramic material in order to obtain a very fine powder of varistor material, a powder is produced of conductive or semiconductive material able to assume the pasty state at a temperature lower than 850°C and a binder is incorporated therein to obtain a screen printing paste. The layer deposited by screen printing on a substrate such as glass, is dried and then heat treated so as to assure cohesion of the layer. This layer is either inserted between a previously deposited electrode and another electrode, or covered by two separate electrodes. The invention is particularly applicable to matrix access display screens.

410632

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