TH131364A - Glass substrate for magnetic recording medium, magnetic log medium, and empty glass substrate for magnetic recording medium. - Google Patents

Abstract

DC60 (26/04/56) The current invention involves a glass substrate for a magnetic recording medium consisting of a composite glass that is expressed as 56 percent molar. Up to 75 percent of SiO2, 1 to 11 percent of Al2O3, greater than 0 percent but equal or less than 4 percent of Li2O, equal or greater than 1 percent but less than 15 percent of Na2O, equal to or greater than 0 percent but less than 3 percent. Of K2O, and virtually no BaO with all quantities of Li2O, Na2O, and K2O that fall within the range of 6 to 15 percent, with a molar ratio (Li2O / Na2O) of less than 0.50, with a Molar {K2O / (Li2O + Na2O + K2O)} that is equal to or less than 0.13, where all quantities of MgO, CaO, and SrO fall within the range of 10 to 30 percent, with all quantities of MgO and CaO that falls within the range of 10 to 30 percent, with a molar ratio {(MgO + CaO) / (MgO + CaO + SrO)} that is equal to or greater than 0.86, with the total content of alkali oxide metal. And metal The above alkali oxides that fall within the range of 20 to 40 percent, with the molar ratio {(MgO + CaO + Li2O) / (Li2O + Na2O + K2O + MgO + CaO + SrO)). That is equal to or greater than 0.50, with all quantities of ZrO2, TiO2, Y2O3, La2O3, Gd2O3, Nb2O5, and Ta2O5 that are greater than 0 percent but equal or less than 10 percent, and with a molar ratio {(ZrO2 + TiO2 + Y2O3 + La2O3 + Gd2O3 + Nb2O5 + Ta2O5) / Al2O3} that is equal to or greater than 0.40, as with The glass transition temperature is equal to or higher than 600 ° C, the average coefficient of Expanded linearly equal to or greater than 70 x 10 to the power of -7 / ° C at 100 to 300 ° C, and its modulus is also equal to or greater than 80 Gpa. Current invention involves substrates. Glass substrate for the medium A magnetic recoraing medium (magnetic recoraing medium), consisting of a composite glass, is expressed as 56 to 75 percent molarity of sio2, 1 to 11 percent of Al2O3, more than 0 percent equal or less than 4. Li2O percentages, equal to or greater than 1 percent but less than 15 percent of Na2O, equal to or greater than 0 percent but less than 3 percent of K2O, and virtually no BaO with all of Li2O, Na2O, and K2O subjected In parts of 6 to 15 percent, that has a molar ratio. (Li2O / Na2O) less than 0.5, with a molar ratio {K2O / Li2O + Na2O + K2O} equal to or less than 0.13 with all quantities of MgO, CaO, and SrO that fall within the range of 10 to 30%, with all quantities of MgO and CaO within the range of 10 to 30%, with a molar ratio {(MgO + CaO) / MgO + CaO + SrO)} equal to or greater than 0.86, with All volumes of alkali oxides and metals The above alkali oxides that fall within the range of 20 to 40 percent, with the molar ratio {(MgO + CaO + Li2O) / (Li2O + Na2O + K2O + MgO + CaO + SrO)). That is equal to or greater than 0.50, with all quantities of ZrO2, TiO2, Y2O2, La2O3, Gd2O3, Nb2O5, and Ta2O5 that are greater than 0 percent but equal or less than 10 percent, and with a molar ratio {(ZrO2 + TiO2 + Y2O3 + La2O3 + Gd2O3 + Nb2O5 + Ta2O5) / Al2O3} that is equal to or greater than 0.40, as with The glass transition temperature is equal to or higher than 600 ° C, the average coefficient of Linear expansion equal to or greater than 70x10-7 / ° C at 100 to 300 ° C, and The modulus of is also equal to or greater than 80 Gpa.

Claims (1)

: DC60 (26/04/56) The current invention involves a glass substrate for a magnetic recording medium consisting of a composite glass that is expressed as a percentage molar. 56 to 75% of SiO2, 1 to 11% of Al2O3, more than 0% but equal or less than 4% of Li2O, equal or greater than 1% but less than 15% of Na2O, equal to or greater than 0% but less than 3. Percentage of K2O, and virtually none BaO with total quantities of Li2O, Na2O, and K2O that fall within the range of 6 to 15 percent, with a molar ratio (Li2O / Na2O) of less than 0.50, with The molar ratio {K2O / (Li2O + Na2O + K2O)} that is equal to or less than 0.13, with all quantities of MgO, CaO, and SrO that fall within the range of 10 to 30 percent, with all quantities of MgO. And CaO that falls within the range of 10 to 30%, with a molar ratio {(MgO + CaO) / (MgO + CaO + SrO)} that is equal to or greater than 0.86, with all volumes of alkali metals. Oxides and metals The above alkali oxides that fall within the range of 20 to 40 percent, with the molar ratio {(MgO + CaO + Li2O) / (Li2O + Na2O + K2O + MgO + CaO + SrO)). That is equal to or greater than 0.50, with all quantities of ZrO2, TiO2, Y2O3, La2O3, Gd2O3, Nb2O5, and Ta2O5 that are greater than 0 percent but equal or less than 10 percent, and with a molar ratio {(ZrO2 + TiO2 + Y2O3 + La2O3 + Gd2O3 + Nb2O5 + Ta2O5) / Al2O3} that is equal to or greater than 0.40, as with The glass transition temperature is equal to or higher than 600 ° C, the average coefficient of Expanded linearly equal to or greater than 70 x 10 to the power of -7 / ° C at 100 to 300 ° C, and its modulus is also equal to or greater than 80 Gpa. Current invention involves substrates. Glass substrate for the medium A magnetic recoraing medium (magnetic recoraing medium), consisting of a composite glass, is expressed as 56 to 75 percent molarity of sio2, 1 to 11 percent of Al2O3, more than 0 percent equal or less than 4. Li2O percentages, equal to or greater than 1 percent but less than 15 percent of Na2O, equal to or greater than 0 percent but less than 3 percent of K2O, and virtually no BaO with all of Li2O, Na2O, and K2O subjected to. In parts of 6 to 15 percent, that has a molar ratio. (Li2O / Na2O) less than 0.5, with a molar ratio {K2O / Li2O + Na2O + K2O} equal to or less than 0.13 with all quantities of MgO, CaO, and SrO that fall within the range of 10 to 30%, with all quantities of MgO and CaO within the range of 10 to 30%, with a molar ratio {(MgO + CaO) / MgO + CaO + SrO)} equal to or greater than 0.86, with All volumes of alkali oxides and metals The above alkali oxides that fall within the range of 20 to 40 percent, with the molar ratio {(MgO + CaO + Li2O) / (Li2O + Na2O + K2O + MgO + CaO + SrO)). That is equal to or greater than 0.50, with all quantities of ZrO2, TiO2, Y2O2, La2O3, Gd2O3, Nb2O5, and Ta2O5 that are greater than 0 percent but equal or less than 10 percent, and with a molar ratio {(ZrO2 + TiO2 + Y2O3 + La2O3 + Gd2O3 + Nb2O5 + Ta2O5) / Al2O3} that is equal to or greater than 0.40, as with The glass transition temperature is equal to or higher than 600 ° C, the average coefficient of Linear expansion equal to or greater than 70x10-7 / ° C at 100 to 300 ° C, and The modulus of also equal to or greater than 80 GPascal. Privilege (item one) which will appear on the advertisement page: ------ 12/21/2018 ------ (OCR) Page 1 of the number 4 pages. 1. Glass substrate for magnetic recording medium (magneticrecording medium) which consists of glass that is assembled with That was expressed as 56 to 75 percent molar percent of Si02, 1 to 11 percent of Al203, greater than 0 percent but equal or less than 4 percent of Li2O, equal to or greater than 1 percent but less than 15 percent of Na2O, equal to. Tag: