发明名称 |
Voltage-dependent resistor and method of manufacturing same |
摘要 |
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).
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申请公布号 |
US4581159(A) |
申请公布日期 |
1986.04.08 |
申请号 |
US19820382910 |
申请日期 |
1982.05.28 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
HENNINGS, DETLEV;SCHNELL, AXEL;SCHREINEMACHER, HERBERT |
分类号 |
H01C7/10;C04B35/46;H01C7/115;(IPC1-7):H01B1/06 |
主分类号 |
H01C7/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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