JP5142996B2 - ボロアルミノシリケートガラスの清澄 - Google Patents
ボロアルミノシリケートガラスの清澄 Download PDFInfo
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- 239000011521 glass Substances 0.000 title claims description 194
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 80
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 36
- 238000002844 melting Methods 0.000 claims description 33
- 230000008018 melting Effects 0.000 claims description 32
- 239000000463 material Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 22
- 229910006404 SnO 2 Inorganic materials 0.000 claims description 17
- 238000003280 down draw process Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 11
- -1 B 2 O 3 Inorganic materials 0.000 claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 5
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 61
- 239000000395 magnesium oxide Substances 0.000 description 31
- 239000000203 mixture Substances 0.000 description 26
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 239000000758 substrate Substances 0.000 description 23
- 239000004973 liquid crystal related substance Substances 0.000 description 22
- 230000007423 decrease Effects 0.000 description 14
- 230000005496 eutectics Effects 0.000 description 14
- 150000002500 ions Chemical class 0.000 description 14
- 150000001768 cations Chemical class 0.000 description 13
- 239000012071 phase Substances 0.000 description 13
- 238000005352 clarification Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 12
- 238000007499 fusion processing Methods 0.000 description 12
- 239000007788 liquid Substances 0.000 description 12
- 229910052760 oxygen Inorganic materials 0.000 description 12
- 229910052906 cristobalite Inorganic materials 0.000 description 11
- 239000013078 crystal Substances 0.000 description 11
- 239000011575 calcium Substances 0.000 description 10
- 239000001301 oxygen Substances 0.000 description 10
- 230000008569 process Effects 0.000 description 10
- 239000000126 substance Substances 0.000 description 10
- 229910000287 alkaline earth metal oxide Inorganic materials 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- 229910052785 arsenic Inorganic materials 0.000 description 7
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 6
- 239000003513 alkali Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 6
- 230000005684 electric field Effects 0.000 description 6
- 239000010408 film Substances 0.000 description 6
- 229910052863 mullite Inorganic materials 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 229910052787 antimony Inorganic materials 0.000 description 5
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 5
- 239000006025 fining agent Substances 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 229910000323 aluminium silicate Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000000356 contaminant Substances 0.000 description 4
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 239000007791 liquid phase Substances 0.000 description 4
- 239000011777 magnesium Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000010587 phase diagram Methods 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 230000010287 polarization Effects 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 4
- 229910001887 tin oxide Inorganic materials 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052788 barium Inorganic materials 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 235000012215 calcium aluminium silicate Nutrition 0.000 description 3
- 238000007496 glass forming Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000006060 molten glass Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000000704 physical effect Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 229910052712 strontium Inorganic materials 0.000 description 3
- 239000010456 wollastonite Substances 0.000 description 3
- 229910052882 wollastonite Inorganic materials 0.000 description 3
- 229910017855 NH 4 F Inorganic materials 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 229910052810 boron oxide Inorganic materials 0.000 description 2
- 239000000404 calcium aluminium silicate Substances 0.000 description 2
- WNCYAPRTYDMSFP-UHFFFAOYSA-N calcium aluminosilicate Chemical compound [Al+3].[Al+3].[Ca+2].[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O WNCYAPRTYDMSFP-UHFFFAOYSA-N 0.000 description 2
- 229940078583 calcium aluminosilicate Drugs 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 210000002858 crystal cell Anatomy 0.000 description 2
- 229910002026 crystalline silica Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000001312 dry etching Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 238000004776 molecular orbital Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 229910001388 sodium aluminate Inorganic materials 0.000 description 2
- DHEQXMRUPNDRPG-UHFFFAOYSA-N strontium nitrate Chemical compound [Sr+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O DHEQXMRUPNDRPG-UHFFFAOYSA-N 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 238000007088 Archimedes method Methods 0.000 description 1
- WKBOTKDWSSQWDR-UHFFFAOYSA-N Bromine atom Chemical compound [Br] WKBOTKDWSSQWDR-UHFFFAOYSA-N 0.000 description 1
- 229910021193 La 2 O 3 Inorganic materials 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000006124 Pilkington process Methods 0.000 description 1
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 229910002800 Si–O–Al Inorganic materials 0.000 description 1
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 235000005505 Ziziphus oenoplia Nutrition 0.000 description 1
- 244000104547 Ziziphus oenoplia Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052656 albite Inorganic materials 0.000 description 1
- HZVVJJIYJKGMFL-UHFFFAOYSA-N almasilate Chemical compound O.[Mg+2].[Al+3].[Al+3].O[Si](O)=O.O[Si](O)=O HZVVJJIYJKGMFL-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910052661 anorthite Inorganic materials 0.000 description 1
- 238000004630 atomic force microscopy Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- GDTBXPJZTBHREO-UHFFFAOYSA-N bromine Substances BrBr GDTBXPJZTBHREO-UHFFFAOYSA-N 0.000 description 1
- 229910052794 bromium Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 210000004027 cell Anatomy 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000001010 compromised effect Effects 0.000 description 1
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 229910052878 cordierite Inorganic materials 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000006066 glass batch Substances 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 239000000156 glass melt Substances 0.000 description 1
- 150000004820 halides Chemical class 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000005802 health problem Effects 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052651 microcline Inorganic materials 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052652 orthoclase Inorganic materials 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229910052654 sanidine Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- 229910052645 tectosilicate Inorganic materials 0.000 description 1
- 239000012085 test solution Substances 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000000196 viscometry Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
- C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B17/00—Forming molten glass by flowing-out, pushing-out, extruding or drawing downwardly or laterally from forming slits or by overflowing over lips
- C03B17/06—Forming glass sheets
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/06—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in pot furnaces
- C03B5/08—Glass-melting pots
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C1/00—Ingredients generally applicable to manufacture of glasses, glazes, or vitreous enamels
- C03C1/004—Refining agents
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Glass Compositions (AREA)
Description
(a) 1.00≦Σ[RO]/[Al2O3]≦1.25(好ましくは、1.03≦Σ[RO]/[Al2O3]≦1.12)、ここで、[Al2O3]はAl2O3のモルパーセントであり、Σ[RO]はMgO,CaO,SrOおよびBaOのモルパーセントの合計と等しく、
(b) ガラスが以下の組成的特徴の内の少なくとも1つ(好ましくは両方)を有する:
(i) 酸化物基準で、ガラスが多くとも0.05モルパーセントのSb2O3しか含まない、
(ii) 酸化物基準で、ガラスが少なくとも0.01モルパーセントのSnO2を含む、
無アルカリガラスを提供する。
(a) 酸化物基準で、ガラスが多くとも0.05モルパーセントのAs2O3しか含まない、
(b) 酸化物基準で、ガラスが多くとも0.05モルパーセントのSb2O3しか含まない、
(c) 酸化物基準で、ガラスが少なくとも0.01モルパーセントのSnO2を含む。
(i) 1.0以上のΣ[RO]/[Al2O3]比、および
(ii) 1.0モルパーセント以上(好ましくは3.0モルパーセント以下)のMgO含有量、
を有するようにバッチ材料を選択し、溶融し、清澄させる各工程を有してなり、
(a) 清澄工程が、相当な量のヒ素またはアンチモンのいずれも使用せずに行われ(すなわち、As2O3およびSb2O3の濃度が各々、0.05モルパーセント以下である)、
(b) 溶融され清澄されたバッチ材料からダウンドロープロセスにより製造された50枚の連続ガラスシートの一群が、0.05ガス状含有物/立方センチメートル未満の平均ガス状含有物レベルを有し、その一群における各シートが少なくとも500立方センチメートルの体積を有する、
方法を提供する。
(a) 2.41グラム/cm3以下の密度、
(b) 100,000ポアズ以上の液相線粘度、
(c) 650℃以上の歪み点、
(d) 関係式:
28×10-7/℃≦CTE≦34×10-7/℃
を満たす、温度範囲0〜300℃に亘る線熱膨張係数(CTE)。
(i) 多くとも0.05モルパーセントのAs2O3濃度、
(ii) 多くとも0.05モルパーセントのSb2O3濃度、
(iii) 少なくとも0.01モルパーセントのSnO2濃度。
密度 グラム/立方センチメートル
CTE ×10-7/℃(0〜300℃)
歪み点 ℃
ヤング率 ×10+6psi
溶融温度 ℃
液相線温度 ℃
液相線粘度 ポアズ
Claims (8)
- 酸化物基準のモルパーセントで表して、64.0〜71.0%のSiO2、9.0〜12.0%のAl2O3、7.0〜12.0%のB2O3、1.0〜3.0%のMgO、6.0〜11.5%のCaO、0〜2.0%のSrO、および0〜0.1%のBaOを含む無アルカリガラスであって、
(a) 1.00≦Σ[RO]/[Al2O3]≦1.25、
ここで、[Al2O3]はAl2O3のモルパーセントであり、Σ[RO]はMgO,CaO,SrOおよびBaOのモルパーセントの合計と等しく、
(b) 前記ガラスが以下の組成的特徴を有し:
(i) 酸化物基準で、前記ガラスが多くとも0.05モルパーセントのSb2O3しか含まない、
(ii) 酸化物基準で、前記ガラスが少なくとも0.01モルパーセントのSnO2を含む、
(iii) 酸化物基準で、前記ガラスが多くとも0.05モルパーセントのAs 2 O 3 しか含まない、
(c)前記ガラスの清澄にAs 2 O 3 およびSb 2 O 3 を意図的に使用しないで作成されたものであり、
(d)100,000ポアズ以上の液相線粘度を有する
ことを特徴とする無アルカリガラス。 - 酸化物基準で、SrOが多くとも1.0モルパーセントであることを特徴とする請求項1記載のガラス。
- 酸化物基準のモルパーセントで表して、64.0〜71.0%のSiO2、9.0〜12.0%のAl2O3、7.0〜12.0%のB2O3、1.0〜3.0%のMgO、6.0〜11.5%のCaO、0〜1.0%のSrO、および0〜0.1%のBaOを含む無アルカリガラスであって、
(a) Σ[RO]/[Al2O3]≧1.00
ここで、[Al2O3]はAl2O3のモルパーセントであり、Σ[RO]はMgO,CaO,SrOおよびBaOのモルパーセントの合計と等しく、
(b) 前記ガラスが以下の組成的特徴を有し:
(i) 酸化物基準で、前記ガラスが多くとも0.05モルパーセントのSb 2 O 3 しか含まない、
(ii) 酸化物基準で、前記ガラスが少なくとも0.01モルパーセントのSnO 2 を含む、
(iii) 酸化物基準で、前記ガラスが多くとも0.05モルパーセントのAs 2 O 3 しか含まない、
(c)前記ガラスの清澄にAs 2 O 3 およびSb 2 O 3 を意図的に使用しないで作成されたものであり、
(d)100,000ポアズ以上の液相線粘度を有する
ことを特徴とする無アルカリガラス。 - Σ[RO]/[Al2O3]比≦1.25であることを特徴とする請求項3記載のガラス。
- 2.41グラム/cm3以下の密度を有することを特徴とする請求項1から4いずれか1項記載のガラス。
- 以下の特性を1つ以上有することを特徴とする請求項1から5いずれか1項記載のガラス:
(a) 650℃以上の歪み点、
(b) 関係式:
28×10-7/℃≦CTE≦34×10-7/℃
を満たす、温度範囲0〜300℃に亘る線熱膨張係数(CTE)。 - ダウンドロープロセスにより無アルカリガラスシートを製造する方法であって、前記シートを構成するガラスが、SiO2、Al2O3、B2O3、MgOおよびCaOを含み、酸化物基準で:
(i) 1.0以上のΣ[RO]/[Al2O3]比、ここで、[Al2O3]はAl2O3のモルパーセントであり、Σ[RO]はMgO,CaO,SrOおよびBaOのモルパーセントの合計である、
(ii) 1.0モルパーセント以上のMgO含有量、
(iii) 少なくとも0.01モルパーセントのSnO 2 含有量
(iv) 100,000ポアズ以上の液相線粘度
を有するようにバッチ材料を選択し、溶融し、清澄させる各工程を有してなり、
(a) 前記清澄工程を、As 2 O 3 およびSb 2 O 3 を意図的には使用せずに行い、得られる前記シートを構成するガラスが、Sb 2 O 3 およびAs 2 O 3 を、酸化物基準で、それぞれ最大でも0.05モルパーセントしか含まないものとし、
(b) 溶融され清澄された前記バッチ材料からダウンドロープロセスにより製造された50枚の連続ガラスシートの一群が、0.05ガス状含有物/立方センチメートル未満の平均ガス状含有物レベルを有し、該一群における各シートが少なくとも500立方センチメートルの体積を有する、
ことを特徴とする方法。 - 前記シートを構成するガラスがBaOを実質的に含まないことを特徴とする請求項7記載の方法。
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