초록 ▼

The glass or glass-ceramic has the following composition (in % by weight based on oxide content): SiO2, 25 to 50; B2O3, >5 to 16; Al2O3, 10 to 17; P2O5, 0 to 8; Li2O,5 to 15; Na2O, 0 to 10; K2O, 0 to 10; MgO, 10 to 30; CaO, 0 to 10; SrO, 0 to 8; ZnO, 0 to 8; TiO2, 0.1 to 10; ZrO2, 0 to 8; and at lea

The glass or glass-ceramic has the following composition (in % by weight based on oxide content): SiO2, 25 to 50; B2O3, >5 to 16; Al2O3, 10 to 17; P2O5, 0 to 8; Li2O,5 to 15; Na2O, 0 to 10; K2O, 0 to 10; MgO, 10 to 30; CaO, 0 to 10; SrO, 0 to 8; ZnO, 0 to 8; TiO2, 0.1 to 10; ZrO2, 0 to 8; and at least one refining agent, in an amount as needed according to its purpose. The sum total amount of divalent metal oxides (RO) present is less or equal to than 45% by weight based on oxide content and the sum total amount of alkali metal oxides (R2O) present is less than or equal to 30% by weight based on oxide content. The glass or glass-ceramic material generally has elasticity modulus values (E)>90.times.103 N/mm2 and 30.times.105 N cm/g and 7.0.times.10-6/K and <11.0.times.10-6/K. The material is outstandingly suitable for making fixed disk substrates.

대표청구항 ▼

1. A glass or glass-ceramic having a high specific elasticity modulus with a composition (in % by weight based on oxide content) comprising: SiO225 to 50B2O3>5 to 16Al2O310 to 17P2O50 to 8Li2O.ensp.5 to 15Na2O.ensp.0 to 10K2O.ensp.0 to 10MgO10 to 30CaO.ensp.0 to 10SrO0 to 8ZnO0 to 8TiO20.1 to 10 ZrO

1. A glass or glass-ceramic having a high specific elasticity modulus with a composition (in % by weight based on oxide content) comprising: SiO225 to 50B2O3>5 to 16Al2O310 to 17P2O50 to 8Li2O.ensp.5 to 15Na2O.ensp.0 to 10K2O.ensp.0 to 10MgO10 to 30CaO.ensp.0 to 10SrO0 to 8ZnO0 to 8TiO20.1 to 10 ZrO20 to 8and at least one refining agent, as needed, in an amount suitable for refining;wherein a sum total amount of divalent metal oxides (RO) present is less than or equal to 45% by weight based on said oxide content and a sum total amount of alkali metal oxides (R2O) present is less than or equal to 30% by weight based on said oxide content.