Patent ID: 7069641
Filing Date: 2006-07-04
Classification: C25D,H01C,H05K,Y10T

Abstract:
1. A method for preparing composite materials of a positive temperature coefficient thermistor device, comprising the following steps: providing a metal laminated material comprising a top metal layer and a bottom metal layer, an insulating layer between the top and the bottom metal layer, and a conducting through hole disposed between the top metal layer and the bottom metal layer; performing a composite electroplating process using an electroplating solution comprising boric acid, carbon black and nickel to form a composite electroplating layer on the surface of the top metal layer, wherein the composite electroplating layer is a continuous porous structure with a secondary aggregation of carbon black and electroplated metal; and thermal-laminating a polymeric composite material on the composite electroplating layer to form the composite materials of the positive temperature coefficient thermistor device, wherein the polymeric composite material is conductive crystallized and filled with carbon black.