Machinable glasses

Details Machinable glasses Machinable glasses

1978-01-06

1978-09-05

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 396, 106 397, 106 398, 106 54, C03C 310, C03C 38, C03C 322

Patent

active

041117085

ABSTRACT:
The present invention relates to glass articles which have compositions within the Li.sub.2 O-ZnO-PbO-B.sub.2 O.sub.3 -SiO.sub.2 -TiO.sub.2 -Al.sub.2 O.sub.3 system, which exhibit a dense white opal appearance, and which have good machinability characteristics. The latter property enables the articles to be sawed and drilled with hand tools without spalling or breakage and, in addition, to be polished to a relatively high gloss. The glasses are rendered opaque by their spearation into a lead oxide rich phase and a B.sub.2 O.sub.3 -SiO.sub.2 rich phase. The glasses may be converted to glass-ceramic materials, either before or after machining, if desired.

REFERENCES:
patent: 3369961 (1968-02-01), Dalton et al.
patent: 3503763 (1970-03-01), Mills
patent: 4038448 (1977-07-01), Boyd et al.

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