Patent ID: 7800028
Filing Date: 2010-09-21
Classification: H01C,H05B,H05K

Abstract:
1. A controllable electrothermal element of a PTC thick film circuit comprises: a substrate and a serial electronic paste, the serial electronic paste is prepared on the substrate, said serial electronic paste comprises a medium paste and an electrode paste, the serial electronic paste includes three parts, a functional phase, an inorganic adhesive phase and an organic carrier, the inorganic adhesive phase of the medium paste is borosilicate and aluminum silicate, and the organic carrier of the inorganic adhesive phase of the medium paste is the main solvent; the inorganic adhesive phase of the electrode paste is the mixture of oxide and glass and the organic carrier is auxiliary solvent, wherein said serial electronic paste further comprises PTC paste, said substrate is 1Cr18Ni9 series stainless steel substrate, the serial electronic paste is in the form of thick film and is prepared on the substrate; the composition of said functional phase of the medium paste is CaO—Al said medium paste and serial austenitic stainless steel comprises the substrate for a serial insulating radiating product; the substrate of the serial insulating radiating product includes said medium paste and serial ferritic stainless steel; the inorganic adhesive phase of said PTC paste is oxide and its organic carrier is a thickener; the composition of said functional phase is main composition (Ba: 50˜63% by weight, Pb: 20˜33% by weight, Ca: 8˜13% by weight) TiO a Curie point moves to high temperature side or low temperature side through adding different impurities and replacing Ba in BaTiO the controllable electrothermal element of the PTC thick film circuit is seriated at a temperature range from 30 to 400° C.; the composition of the functional phase of said electrode phase is Bi