Glass-ceramics, process of producing the glass-ceramics and dent

Details Glass-ceramics, process of producing the glass-ceramics and dent Glass-ceramics, process of producing the glass-ceramics and dent

1990-08-23

1991-11-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

106 35, C03C 1016

Patent

active

050666193

ABSTRACT:
Disclosed is glass-ceramics produced by and a method of producing the glass-ceramics comprising the step of precipitating a calcium-potassium mica crystal consisting of Ca-K-Mg-Al-Si-O-F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal and a diopside crystal, from glass containing components, in percent by weight, 2 to 17% of CaO, 0.5 to 5% of K.sub.2 O, 20 to 35% of MgO, 30 to 50% of SiO.sub.2, 5 to 30% of Al.sub.2 O.sub.3, and 1.5 to 14% of Fluorine (Calculated as F); or precipitating a calcium-potassium-sodium mica crystal consisting of Ca-K-Na-Mg-Al-Si-O-F and at least one crystal selected from the group consisting of an enstatite crystal, an akermanite crystal, a diopside crystal, an anorthite crystal and a richterite crystal, from glass containing components, in percent by weight, 2 to 17% of CaO, 0.5 to 5% of K.sub.x O, 0.1 to 4% of Na.sub.2 O, 15 to 35% of MgO, 30 to 49% of SiO.sub.2, 5 to 30% of Al.sub.2 O.sub.3, and 1.5 to 14% of Fluorine (calculated as F). In the above method, the glass is heat treated successively at a temperature higher than its glass transition point by a range of from 10.degree. to 100.degree. C. and at a temperature higher than its glass transition point by a range of from 100.degree. to 500.degree. C. to thereby precipitate the above-mentioned matters.
Further disclosed is an artificial dental crown composed of the above-mentioned glass-ceramics.

REFERENCES:
patent: 3689293 (1972-09-01), Beall
patent: 4118237 (1978-10-01), Beall et al.
patent: 4431420 (1984-02-01), Adair
patent: 4747876 (1988-05-01), Hakematsuka et al.
patent: 4789649 (1988-12-01), Abert et al.
patent: 4799887 (1989-01-01), Hakematsuka et al.

Affiliated with

Also associated with

Rating

Glass-ceramics, process of producing the glass-ceramics and dent does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Glass-ceramics, process of producing the glass-ceramics and dent, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glass-ceramics, process of producing the glass-ceramics and dent will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1370210