Method of varistor capacitance reduction by boron diffusion

Details Method of varistor capacitance reduction by boron diffusion Method of varistor capacitance reduction by boron diffusion

1981-11-02

1984-07-17

Morgenstern, Norman

Coating processes

Electrical product produced

Resistor for current control

4271262, 427299, 427331, 427355, 338 21, H01C 712, H01C 1730

Patent

active

044606230

ABSTRACT:
Diffusing boron-containing glass, such as bismuth borosilicate glass, into conventional sintered zinc oxide based varistor material reduces varistor material intrinsic capacitance. In the method, a layer of glass powder is screen-printed, painted, or otherwise applied to the varistor material surface. Upon firing, a portion of the glass diffuses into the material, while the remainder creates an insulating layer on the varistor material surface which may be removed by grinding. The varistor material may then be annealed to restore varistor electrical properties which may have been degraded by mechanical damage caused by the grinding. Device electrodes are attached by conventional means.

REFERENCES:
patent: 3903494 (1975-09-01), May
patent: 4046847 (1977-09-01), Kresge
patent: 4060661 (1977-11-01), Takami et al.
patent: 4172922 (1979-10-01), Merz et al.
Selim et al., J. App. Phys. 5l(1), Jan. 1980.

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