EP 0065806 B1 19851121 - VOLTAGE-DEPENDENT RESISTOR AND ITS MANUFACTURING PROCESS
Title (en)
VOLTAGE-DEPENDENT RESISTOR AND ITS MANUFACTURING PROCESS
Publication
Application
Priority
DE 3121289 A 19810529
Abstract (en)
[origin: US4581159A] A voltage-dependent resistor having a low operational field strength with a ceramic sintered body on the basis of a polycrystalline alkaline earth metal titanate doped with a small quantity of a metal oxide so as to produce an N-type conductivity, in which the sintered body comprises at its grain boundaries insulating layers formed by in-diffusion of at least a metal oxide or at least a metal oxide compound and comprises of an alkaline earth metal titanate having Perowskite structure of the general formula: (A1-xLnx)TiO3.yTiO2 or A(Ti1-xMex)O3.yTiO2 wherein: A=alkaline earth metal; Ln=rare earth metal; Me=metal having a valency of 5 or more; 0.0005<x<solubility limit in the Perowskite phase; y=0.001 to 0.02. The insulating layers are formed in that the sintered body is covered on its surface with a suspension containing at least a metal oxide having a comparatively low melting-point as compared with the sintered body or at least a metal oxide compound having a comparatively low melting-point with respect to the sintered body and is tempered in an oxidizing atmosphere at a temperature which is above the melting-point of the suspension component(s).
IPC 1-7
IPC 8 full level
C04B 35/00 (2006.01); C04B 35/46 (2006.01); H01C 7/10 (2006.01); H01C 7/115 (2006.01)
CPC (source: EP US)
H01C 7/115 (2013.01 - EP US)
Designated contracting state (EPC)
BE DE FR GB NL
DOCDB simple family (publication)
EP 0065806 A2 19821201; EP 0065806 A3 19830504; EP 0065806 B1 19851121; DE 3121289 A1 19821223; DE 3267542 D1 19860102; JP H0236041 B2 19900815; JP S57199202 A 19821207; US 4581159 A 19860408; US 4692289 A 19870908
DOCDB simple family (application)
EP 82200615 A 19820519; DE 3121289 A 19810529; DE 3267542 T 19820519; JP 9002982 A 19820528; US 38291082 A 19820528; US 75375785 A 19850711