Electrical resistors – Resistance value responsive to a condition – Current and/or voltage
Patent
1992-11-06
1994-04-26
Brunsman, David
Electrical resistors
Resistance value responsive to a condition
Current and/or voltage
1062862, 501 97, 501105, 501130, 501131, H01C 710, H01C 713
Patent
active
053070461
ABSTRACT:
It is disclosed that the properties of a ceramic mullite-kaolinite based passivating coating composition applied as a collar to metal oxide varistor valve block cylindrical surfaces are improved by including in the coating composition from 0.03 to 15% by weight of the coating composition one or more of the following additive compounds: TiO.sub.2 ; Y.sub.2 O.sub.3 ; ZrO.sub.2 ; ZnO; Boroflux (2ZNO.sup.. 3B.sub.2 O.sub.3.sup.. 7H.sub.2 O; or 3ZnO.sup.. 2B.sub.2 O.sub.3.sup.. 5H.sub.2 O); or Si.sub.3 N.sub.4. The coating composition comprises by dry weight a mixture of 55-85% mullite and 15-45% kaolinite, one or a mixture of the above additive compounds, and sufficient water to form a sprayable slurry. The inclusion of the additive compound results in enhanced contact adhesion between the collar and the metal oxide varistor peripheral surface.
REFERENCES:
patent: 3128194 (1964-04-01), Christie, Jr.
patent: 3959543 (1976-05-01), Ellis
patent: 4046847 (1977-09-01), Kresge
Ceramic Industry, "Materials Handbook . . . ", Jan. 1989, vol. 132, No. 1, Solon, OH, p. 73.
'Hubbell Incorporated
Berdo Robert H.
Brunsman David
Presson Jerry M.
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