Non-alkali glass and method for producing same
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/091
C03C-003/093
C03C-003/087
출원번호
US-0943459
(2015-11-17)
등록번호
US-9540273
(2017-01-10)
우선권정보
JP-2012-103147 (2012-04-27)
발명자
/ 주소
Tokunaga, Hirofumi
Tsujimura, Tomoyuki
Nishizawa, Manabu
Koike, Akio
출원인 / 주소
ASAHI GLASS COMPANY, LIMITED
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
0인용 특허 :
7
초록▼
The present invention relates to a non-alkali glass having a strain point of from 710° C. to lower than 725° C., an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a tempera
The present invention relates to a non-alkali glass having a strain point of from 710° C. to lower than 725° C., an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1320° C. or lower, and containing, indicated by mol % on the basis of oxides, SiO2 66 to 70, Al2O3 12 to 14, B2O3 exceeding 0 to 1.5, MgO exceeding 9.5 to 13 (or 5 to 9.5), CaO 4 to 9 (or 4 to 11), SrO 0.5 to 4.5, BaO 0 to 0.5 and ZrO 0 to 2.
대표청구항▼
1. A non-alkali glass having a strain point of from 710° C. to lower than 725° C., a glass transition point of 780° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or
1. A non-alkali glass having a strain point of from 710° C. to lower than 725° C., a glass transition point of 780° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 43×10−7/° C., a temperature T2 at which glass viscosity reaches 102 dPa·s of 1710° C. or lower, a temperature T4 at which the glass viscosity reaches 104 dPa·s of 1320° C. or lower, the non-alkali glass comprising, indicated by mol % on the basis of oxides: SiO266 to 70,Al2O312 to 14,B2O3exceeding 0 to 1.5,MgOexceeding 9.5 to 12,CaO4 to 9,SrO0.5 to 4.5,BaO0 to 0.5 andZrO20 to 2,wherein MgO+CaO+SrO+BaO is from 17 to 21,MgO/(MgO+CaO+SrO+BaO) is 0.4 or more,MgO/(MgO+CaO) is 0.4 or more, andMgO/(MgO+SrO) is 0.6 or more. 2. The non-alkali glass according to claim 1, having a glass transition point of 780° C. or higher, a specific gravity of 2.65 or less, a Young's modulus of 84 GPa or more, a devitrification temperature of 1340° C. or lower, a photoelastic constant of from 25 to 29 nm/MPa/cm, and a dielectric constant of 5.8 to 6.5. 3. The non-alkali glass according to claim 1, having a glass transition point of 780° C. or higher, a specific gravity of 2.62 or less, a Young's modulus of 84 GPa or more, a devitrification temperature of 1330° C. or lower, a photoelastic constant of from 25 to 29 nm/MPa/cm, and a dielectric constant of 5.8 to 6.5. 4. The non-alkali glass according to claim 1, having the strain point of from 710° C. to lower than 725° C., the average thermal expansion coefficient at from 50 to 300° C. of from 35×10−7 to 42×10−7/° C., the temperature T2 at which glass viscosity reaches 102 dPa·s of 1690° C. or lower, the temperature T4 at which the glass viscosity reaches 104 dPa·s of 1315° C. or lower, the non-alkali glass comprising, indicated by mol % on the basis of oxides: SiO266 to 69,Al2O312 to 13.5,B2O30.4 to 1.4,MgOexceeding 9.5 to 11.5,CaO4 to 8,SrO2 to 4.5,BaO0 to 0.1 andZrO20 to 0.5,wherein MgO+CaO+SrO+BaO is from 17 to 20,MgO/(MgO+CaO+SrO+BaO) is 0.4 or more,MgO/(MgO+CaO) is 0.55 or more, andMgO/(MgO+SrO) is 0.63 or more. 5. The non-alkali glass according to claim 1, having the strain point of from 710° C. to lower than 725° C., the average thermal expansion coefficient at from 50 to 300° C. of from 35×10−7 to 41×10−7/° C., the temperature T2 at which glass viscosity reaches 102 dPa·s of 1690° C. or lower, the temperature T4 at which the glass viscosity reaches 104 dPa·s of 1310° C. or lower, the non-alkali glass comprising, indicated by mol % on the basis of oxides: SiO266.5 to 68,Al2O312.5 to 13.5,B2O30.4 to 1.3,MgOexceeding 9.5 to 11.5,CaO5 to 8,SrO2 to 4.5,substantially no BaO andsubstantially no ZrO2,wherein MgO+CaO+SrO+BaO is from 18 to 20,MgO/(MgO+CaO+SrO+BaO) is 0.45 or more,MgO/(MgO+CaO) is 0.55 or more, andMgO/(MgO+SrO) is 0.65 or more. 6. A method for producing the non-alkali glass described in claim 1, wherein silica sand having a median particle size D50 of from 20 to 27 μm, a ratio of particles having a particle size of 2 μm or less of 0.3% by volume or less and a ratio of particles having a particle size of 100 μm or more of 2.5% by volume or less is used as a silicon source of a SiO2 raw material. 7. A method for producing the non-alkali glass described in claim 1, wherein an alkaline earth metal source containing a hydroxide of an alkaline earth metal in an amount of from 15 to 100 mol % (in terms of MO, provided that M is an alkaline earth metal element, hereinafter the same), of 100 mol % (in terms of MO) of the alkaline earth metal source is used as the alkaline earth metal source of MgO, CaO, SrO and BaO. 8. A method for producing the non-alkali glass described in claim 1, wherein silica sand having a median particle size D50 of from 20 to 27 μm, a ratio of particles having a particle size of 2 μm or less of 0.3% by volume or less and a ratio of particles having a particle size of 100 μm or more of 2.5% by volume or less is used as a silicon source of a SiO2 raw material, and an alkaline earth metal source containing a hydroxide of an alkaline earth metal in an amount of from 15 to 100 mol % (in terms of MO, provided that M is an alkaline earth metal element, hereinafter the same), of 100 mol % (in terms of MO) of the alkaline earth metal source is used as the alkaline earth metal source of MgO, CaO, SrO and BaO.
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