Dielectric coating for ozone generator electrodes

Details Dielectric coating for ozone generator electrodes Dielectric coating for ozone generator electrodes

1994-01-10

1996-09-03

Walsh, Donald P.

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

With means applying electromagnetic wave energy or...

427453, C23C 410

Patent

active

055521258

ABSTRACT:
An ozone generator has one or both of the tube type electrodes coated with a dielectric that has high dielectric strength, high dielectric constant, and low piezoelectric activity, and can be applied with a small thickness (less than 0.5 mm). The dielectric has a mixed oxide composition having a dielectric strength of at least about 800 volts/mil, has a dielectric constant that is at least 200, and has low enough piezoelectric activity that it will not ablate, crack, or other otherwise suffer damage as a result of high voltage application over months of use. A metal electrode for use in an ozone generator has a dielectric coating on a surface thereof having a composition comprising: about 30-70% lead oxide, about 2-8% barium oxide, about 2-12% lanthanum oxide, about 3-18% titanium dioxide, about 12-40% zirconium dioxide, and trace materials. A method of coating a metal electrode for use in an ozone generator may include plasma spraying (and the steps leading up to effect of plasma spraying), or dip or spin coating followed by sintering.

REFERENCES:
patent: 4049707 (1977-09-01), Harter et al.
patent: 4650648 (1987-03-01), Beer et al.
patent: 4690803 (1987-09-01), Hirth
patent: 4774062 (1988-09-01), Heinemann

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