Compositions: ceramic – Ceramic compositions – Devitrified glass-ceramics
Patent
1986-10-24
1987-08-18
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Devitrified glass-ceramics
501 4, 501 8, 501 9, C03C 1004, C03C 1014, C03C 1006
Patent
active
046877495
ABSTRACT:
This invention is concerned with the production of glass-ceramic articles wherein enstatite constitutes the predominant crystal phase. Compositions exhibiting a high modulus of rupture, a use temperature in excess of 1200.degree. C., and a high fracture toughness consist essentially, expressed in terms of weight percent on the oxide basis, of about 20-35% MgO, 2-12% Al.sub.2 O.sub.3, 40-70% SiO.sub.2, and at least one metal oxide in the indicated proportions selected from the group consisting of 0-2% Li.sub.2 O, 0-4% CaO, 0-12% SrO, and 0-17% BaO, at least 0.5% Li.sub.2 O being required when present alone and at least 1% SrO and/or BaO being required in the absence of Li.sub.2 O. Compositions exhibiting a use temperature of 1500.degree. C. consist essentially, expressed in terms of weight percent on the oxide basis, of about 30-35% MgO, 53-58% SiO.sub.2, and 10-14% ZrO.sub.2.
REFERENCES:
patent: 3205079 (1965-09-01), Stookey
patent: 3490888 (1970-01-01), Strong
patent: 3585054 (1971-06-01), Korstetter
patent: 3819387 (1974-06-01), Leger
patent: 3873329 (1975-03-01), Beall
patent: 3901716 (1975-08-01), Rogers et al.
Bell Mark L.
Corning Glass Works
Janes, Jr. C. S.
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