| 发明名称 |
NON-LINEAR RESISTOR AND ITS MANUFACTURING PROCESS |
| 摘要 |
A non-linear resistor having an operational field strength which optionally is formed as a VDR- or as an NTC-resistor having 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 re-oxidation of the sintered body and consists of an alkaline earth metal titanate having a 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; yx0.001 to 0.02. The sintered body becomes adjustable in its non-linear resistance variation by selection of the re-oxidation temperature and of the re-oxidation duration in such manner that an initially present NTC-characteristic gradually is observable only at ever increasing temperatures and changes into a VDR-characteristic in the range of the operating temperature of the resistor. |
| 申请公布号 |
EP0066333(B1) |
申请公布日期 |
1985.08.28 |
| 申请号 |
EP19820200616 |
申请日期 |
1982.05.19 |
| 申请人 |
PHILIPS PATENTVERWALTUNG GMBH;N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
HENNINGS, DETLEV, DR.;SCHNELL, AXEL, DR.;SCHREINEMACHER, HERBERT |
| 分类号 |
H01C7/10;C04B35/46;H01C7/115;(IPC1-7):H01C7/10;C04B35/00 |
主分类号 |
H01C7/10 |
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