Alkali free glass and method for producing alkali free glass
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C03C-003/091
C03C-003/087
출원번호
US-0912642
(2013-06-07)
등록번호
US-9193622
(2015-11-24)
우선권정보
JP-2010-272674 (2010-12-07)
발명자
/ 주소
Tsujimura, Tomoyuki
Nishizawa, Manabu
Koike, Akio
출원인 / 주소
ASAHI GLASS COMPANY, LIMITED
대리인 / 주소
Oblon, McClelland, Maier & Neustadt, L.L.P.
인용정보
피인용 횟수 :
1인용 특허 :
3
초록▼
The present invention relates to an alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 40×10−7/° C., a temperature T2 at which a glass viscosity is 102 dPa·s of 1,710° C. or lower, and a temperature T4 at wh
The present invention relates to an alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 40×10−7/° C., a temperature T2 at which a glass viscosity is 102 dPa·s of 1,710° C. or lower, and a temperature T4 at which a glass viscosity is 104 dPa·s of 1,320° C. or lower, the alkali-free glass including, in terms of mol % on the basis of oxides, SiO2: 66 to 70, Al2O3: 12 to 15, B2O3: 0 to 1.5, MgO: more than 9.5 and 13 or less, CaO: 4 to 9, SrO: 0.5 to 4.5, BaO: 0 to 1, and ZrO2: 0 to 2, in which 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, MgO/(MgO+SrO) is 0.6 or more, and the alkali-free glass does not substantially contain an alkali metal oxide.
대표청구항▼
1. An alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 40×10−7/° C., a temperature T2 at which a glass viscosity is 102 dPa·s of 1,710° C. or lower, a temperature T4 at which a glass viscosity is 104 dPa·s
1. An alkali-free glass having a strain point of 725° C. or higher, an average thermal expansion coefficient at from 50 to 300° C. of from 30×10−7 to 40×10−7/° C., a temperature T2 at which a glass viscosity is 102 dPa·s of 1,710° C. or lower, a temperature T4 at which a glass viscosity is 104 dPa·s of 1,320° C. or lower, and a devitrification temperature of 1,350° C. or lower, the alkali-free glass comprising, in terms of mol % on the basis of oxides: SiO266 to 70,Al2O312 to 14.5,B2O30 to 1.5,MgOmore than 9.5 and 11.5 or less,CaO4 to 9,SrO0.5 to 4.5,BaO0 to 1, 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,MgO/(MgO+SrO) is 0.6 or more, andthe alkali-free glass does not substantially contain an alkali metal oxide. 2. The method for producing the alkali-free glass according to claim 1, wherein a silica sand, in which a median diameter D50 is from 20 to 27 μm, a proportion of particles having a particle size of 2 μm or less is 0.3 vol % or less, and a proportion of particles having a particle size of 100 μm or more is 2.5 vol % or less, is used as a silicon source of SiO2. 3. The method for producing the alkali-free glass according to 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, and hereinafter the same) of 100 mol % of the alkaline earth metal source is used as the alkaline earth metal source of MgO, CaO, SrO and BaO. 4. The method for producing the alkali-free glass according to claim 1, wherein a silica sand, in which a median diameter D50 is from 20 to 27 μm, a proportion of particles having a particle size of 2 μm or less is 0.3 vol % or less, and a proportion of particles having a particle size of 100 μm or more is 2.5 vol % or less, is used as a silicon source of SiO2; 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, and hereinafter the same) of 100 mol % of the alkaline earth metal source is used as the alkaline earth metal source of MgO, CaO, SrO and BaO. 5. The alkali-free glass according to claim 1, wherein SrO is included in an amount of 2 to 4.5 mol % on the basis of oxides. 6. The alkali-free glass according to claim 1 having a glass transition point of 760° C. or higher, a specific gravity of 2.65 or less, a Young's modulus of 84 GPa or more, the devitrification temperature of 1,340° C. or lower, a photoelastic constant of 31 nm/MPa/cm or less, and a dielectric constant of 5.6 or more.
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