Compositions: coating or plastic – Coating or plastic compositions – Marking
Patent
1977-01-07
1978-04-18
Fisher, Richard V.
Compositions: coating or plastic
Coating or plastic compositions
Marking
65 32, 65 33, C03C 322, C03B 3200
Patent
active
040849732
ABSTRACT:
The instant invention is concerned with the preparation of iron-containing glasses having compositions within the R.sub.2 O-Al.sub.2 O.sub.3 -SiO.sub.2 field, wherein R.sub.2 O consists of Li.sub.2 O, Na.sub.2 O, and/or K.sub.2 O, which spontaneously develop thin surface layers containing hematite (alpha-Fe.sub.2 O.sub.3) crystals when exposed to relatively low temperature heat treatments, viz., at least about 675.degree. C. but less than about 950.degree. C., in an oxidizing environment. Described visually, the resulting surfaces exhibit a variety of appearances, ranging from mirror-like through lustrous metallic to dull-earthen. In all surface layers, the hematite crystals may subsequently be chemically reduced to magnetite (Fe.sub.3 O.sub.4) or metallic iron crystals. Permanent magnetization can then be induced by means of the application of a strong magnetic force. The magnetite-containing surfaces can also demonstrate semiconductivity. The metallic iron surface can be highly electrically conductive.
REFERENCES:
patent: 3464806 (1969-09-01), Seki et al.
patent: 3557576 (1971-01-01), Baum
patent: 3639113 (1972-02-01), Aslanova et al.
patent: 3790360 (1974-02-01), Kato et al.
patent: 3892904 (1975-07-01), Tanaka
patent: 3902881 (1975-09-01), Pirooz
patent: 3962514 (1976-06-01), Rittler
patent: 4007048 (1977-02-01), Sack et al.
Andrus Ronald L.
Reade Richard F.
Corning Glass Works
Fisher Richard V.
Janes Jr. Clinton S.
Miga Frank W.
Patty, Jr. Clarence R.
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