Method of producing varistor

Details Method of producing varistor Method of producing varistor

1992-09-09

1994-03-22

Derrington, James

Compositions

Electrically conductive or emissive compositions

Metal compound containing

264 61, 264 65, H01B 106

Patent

active

052961699

ABSTRACT:
A varistor having a non-linear coefficient of at least 40 and improved stability for DC stress is produced by a method including a step of mixing ZnO powder with a solvent solution of Mn and Pb compounds, a step of calcining the resultig mixture, and a step of pulverizing the calcined product to obtain a pulverized product. These steps are performed while preventing the contamination with a Group IIIb or Ia element, so that the pulverized product has MnO and PbO contents of 3-7 mole % and 0.003-0.01 mole %, respectively, and a content of impurity compounds of a IIIb or Ia element of not greater than 20 ppm by weight. The pulverized product is molded and sintered to obtain the varistor.

REFERENCES:
patent: 4618592 (1986-10-01), Kuramoto
patent: 5073302 (1991-12-01), Igari et al.
patent: 5076979 (1991-12-01), Ochi et al.
patent: 5116542 (1992-05-01), Ochi et al.

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