Surface hardness of articles by reactive phosphate treatment

Details Surface hardness of articles by reactive phosphate treatment Surface hardness of articles by reactive phosphate treatment

1994-04-29

2000-06-13

Bell, Janyce

Coating processes

With post-treatment of coating or coating material

Chemical agent applied to treat coating

427343, 427380, 427399, 4274192, 4274193, 428446, 428704, B05D 310

Patent

active

060746998

ABSTRACT:
An article has at its surface a nonmetallic ceramic form of a cation reactive with phosphate ion to form a ceramic phosphate, such as an oxide of a cation selected from the group consisting of beryllium, aluminum, iron, magnesium, calcium, thorium, barium, zirconium, zinc, silicon, and mixtures thereof. A source of reactive phosphate ions, such as concentrated phosphoric acid or monoaluminum phosphate, is applied to the surface of the article. The surface of the article is thereafter heated to cause the nonmetallic ceramic form of the cation and the source of the reactive phosphate ions to react together, producing a phosphate-bonded hard layer at the surface of the article.

REFERENCES:
patent: 3873344 (1975-03-01), Church et al.
patent: 3944683 (1976-03-01), Church et al.
patent: 3956531 (1976-05-01), Church et al.

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