IPC분류정보
| 국가/구분 |
United States(US) Patent
등록
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| 국제특허분류(IPC7판) |
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| 출원번호 |
US-0332703
(1994-11-01)
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발명자
/ 주소 |
- Beall George H. (Big Flats NY) Pinckney Linda R. (Corning NY)
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| 출원인 / 주소 |
- Corning Incorporated (Corning NY 02)
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| 인용정보 |
피인용 횟수 :
64 인용 특허 :
0 |
초록
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This invention is directed at glass-ceramic articles, and methods for producing such articles, exhibiting Young\s modulus between about 14 to 24×106 psi and a fracture toughness in excess of 1.0 MPa√in. The crystal phase assemblage is comprised predominately of generally uniformly-sized spinel-type
This invention is directed at glass-ceramic articles, and methods for producing such articles, exhibiting Young\s modulus between about 14 to 24×106 psi and a fracture toughness in excess of 1.0 MPa√in. The crystal phase assemblage is comprised predominately of generally uniformly-sized spinel-type crystals which are uniformly dispersed within a highly siliceous residual glass matrix phase. The composition of these glass-ceramic articles is consists essentially, expressed in terms of weight percent on the oxide basis, of 35-60% SiO2, 20-35% Al2O3, 0-25% MgO, 0-25% ZnO, at least about 10% MgO+ZnO, 0-20% TiO2, 0-10% ZrO2, 0-2% Li2O and 0-8% NiO. However, if the Al2O3 constituent is present in an amount less than about 25%, the TiO2+ZrO2+NiO amount should be at least 5%. The composition may also contain up to 5% of optional constituents selected from the group consisting of BaO, CaO, PbO, SrO, P2O5, B2O3, Ga2O3, 0-5% R2O and 0- 8% of a transition metal oxide; the R2O selected from the group consisting of Na2O, K2O, Rb2O and C2O.
대표청구항
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A glass-ceramic article exhibiting Young\s modulus between about 14 to 24×106 psi and a fracture toughness in excess of 1.0 MPaㆍm½, wherein the crystal phase assemblage is comprised predominately of generally uniformly-sized spinel crystals which are uniformly dispersed within a highly siliceous res
A glass-ceramic article exhibiting Young\s modulus between about 14 to 24×106 psi and a fracture toughness in excess of 1.0 MPaㆍm½, wherein the crystal phase assemblage is comprised predominately of generally uniformly-sized spinel crystals which are uniformly dispersed within a highly siliceous residual glass matrix phase, the article having an overall composition consisting essentially, expressed in terms of weight percent on the oxide basis, of 35-60% SiO2, 20-35% Al2O3, 7-25% MgO, 0-25% ZnO, at least about 10% MgO+ZnO, 0-20% TiO2, 0-10% ZrO2, 0-2% Li2O, 0-8% NiO, with the proviso that, if the Al2O3 amount is less than about 25%, the TiO2+ZrO2+NiO amount is at least 5%, and up to 5% of optional constituents selected from the group consisting of BaO, CaO, PbO, SrO, P2O5, B2O3, Ga 2O3, 0-5% R2O, wherein R2O is selected from the group consisting of Na2O, K2O, Rb2O, and Cs2O and 0-8% of a transition metal oxide.
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