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°C., and a high fracture toughness consist essentially, expressed in terms of w
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°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% Al2O3, 40-70% SiO2, and at least one metal oxide in the indicated proportions selected from the group consisting of 0-2% Li2O, 0-4% CaO, 0-12% SrO, and 0-17% BaO, at least 0.5% Li2O being required when present alone and at least 1% SrO and/or BaO being required in the absence of Li2O. Compositions exhibiting a use temperature of 1500°C. consist essentially, expressed in terms of weight percent on the oxide basis, of about 30-35% MgO, 53-58% SiO2, and 10-14% ZrO2.
대표청구항▼
A glass-ceramic article exhibiting a high modulus of rupture, a use temperature of at least 1200°C., a high fracture toughness, and a crystal content of at least 90% by volume, said article containing enstatite as the predominant crystal phase, at least one secondary crystal phase selected from the
A glass-ceramic article exhibiting a high modulus of rupture, a use temperature of at least 1200°C., a high fracture toughness, and a crystal content of at least 90% by volume, said article containing enstatite as the predominant crystal phase, at least one secondary crystal phase selected from the group consisting of b20-35% MgO, 2-12% Al2O3, 40-70% SiO2, and at least one metal oxide in the indicated proportion selected from the group consisting of 0-2% Li2O, 0-4% CaO, 0-12% SrO, and 0-17% BaO, at least 0.5% Li2O being required when present alone and at least 1% CaO and/or SrO and/or BaO being required in the absence of Li2O, said composition being essentially free from Na2O, K2O, and fluoride.
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이 특허를 인용한 특허 (17)
Beall George H. ; Pinckney Linda R., .beta.-quartz-based glass-ceramics.
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Zou,Xuleu; Azegami,Kouji, Crystallized glass for information recording medium, crystallized glass substrate, and information recording medium using the crystallized glass substrate.
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