Surface treatment of zirconia ceramic

Details Surface treatment of zirconia ceramic Surface treatment of zirconia ceramic

1977-04-25

1979-01-16

Smith, Ronald H.

Coating processes

With pretreatment of the base

Etching, swelling, or dissolving out part of the base

156638, 156667, 427444, B05D 304, B05D 310

Patent

active

041350120

ABSTRACT:
Smooth surfaces of impervious zirconia-base ceramics are chemically treated to produce micropitting and/or microcratering therein which enables durable adherence of metal coatings (e.g. of noble metal) applied thereon. Treatment involves contact of the smooth surfaces with liquid leachant selected from concentrated sulfuric acid, ammonium bisulfate, alkali metal bisulfate and mixtures thereof at a temperature of at least 250.degree. C. Leached surface is contacted with hydrochloric acid to remove reaction residue comprising sulfate of metal elements including zirconium in the ceramic.

REFERENCES:
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patent: 2872312 (1959-02-01), Eisenberg
patent: 3078180 (1963-02-01), Zander et al.
patent: 3113855 (1963-12-01), Elmer
patent: 3116991 (1964-01-01), Le Clerc et al.
patent: 3287143 (1966-11-01), Yavorsky
patent: 3296012 (1967-01-01), Stalnecker
patent: 3296012 (1967-01-01), Stalnecker
patent: 3365317 (1968-01-01), Yavorsky
patent: 3433680 (1969-03-01), Archer et al.
patent: 3690921 (1972-09-01), Elmore
patent: 3881944 (1975-05-01), Beall

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