SE502937C2 - opal Glass - Google Patents

opal Glass

Info

Publication number
SE502937C2
SE502937C2 SE9402832A SE9402832A SE502937C2 SE 502937 C2 SE502937 C2 SE 502937C2 SE 9402832 A SE9402832 A SE 9402832A SE 9402832 A SE9402832 A SE 9402832A SE 502937 C2 SE502937 C2 SE 502937C2
Authority
SE
Sweden
Prior art keywords
weight
glass
zno
cao
content
Prior art date
Application number
SE9402832A
Other languages
Swedish (sv)
Other versions
SE9402832L (en
SE9402832D0 (en
Inventor
Bo Jonson
Lars Gunnar Johansson
Original Assignee
Glasforskningsinstitutet
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glasforskningsinstitutet filed Critical Glasforskningsinstitutet
Priority to SE9402832A priority Critical patent/SE502937C2/en
Publication of SE9402832D0 publication Critical patent/SE9402832D0/en
Priority to PCT/SE1995/000948 priority patent/WO1996006052A1/en
Priority to AU33584/95A priority patent/AU3358495A/en
Publication of SE9402832L publication Critical patent/SE9402832L/en
Publication of SE502937C2 publication Critical patent/SE502937C2/en

Links

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
    • C03C3/097—Glass compositions containing silica with 40% to 90% silica, by weight containing phosphorus, niobium or tantalum
    • 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
    • C03C4/00—Compositions for glass with special properties
    • C03C4/005—Compositions for glass with special properties for opaline glass

Abstract

Fluorine-free opal glass has the following composition, based on the oxides of the ingredients: 55-65 % by weight of SiO2, 2-6 % by weight of Al2O3, 10-17 % by weight of Na2O, 2-10 % by weight of CaO, 0.1-6 % by weight of BaO, 0.1-6 % by weight of ZnO, 1-8 % by weight of B2O3, 4-12 % by weight of P2O5, 0.1-3 % by weight of Li2O, 0.1-3 % by weight of Sb2O3, 0-4 % by weight of MgO, the total of the weight quantities of the ingredients amounting to 100 %. In the temperature range of 20-300 DEG C, the opal glass has a thermal expansion coefficient of 8-11 x 10<-6> DEG C<-1>, enabling it to be combined with some other translucent glass, such as clear glass, and be melted in electrically-heated furnaces.

Description

502 957 10 15 20 25 30 35 2 tallglas, är denna ca 8-ll x 10-6°C-1 i temperaturområdet 20-300°C. För att en god förenlighet skall anses föreligga mellan två glassorter bör deras värmeutvidgningskoeffi- cienter ej skilja sig åt mer än högst 0,15 x 10_6°C_l. 502 957 10 15 20 25 30 35 2 pine glass, this is about 8-1 x 10-6 ° C-1 in the temperature range 20-300 ° C. In order for good compatibility to be considered to exist between two types of glass, their coefficients of thermal expansion should not differ by more than 0,15 x 10_6 ° C_1.

Föreliggande uppfinning avser att minska eller elimi- nera nackdelarna med den tidigare tekniken och åstadkomma ett fluorfritt opalglas. Ändamålet med uppfinningen uppnås genom att opalgla- set som opacitetsgivande komponent innehåller fosforföre- ningar i stället för fluorföreningar, samt genom att de övriga ingående komponenternas halter har optimerats.The present invention aims to reduce or eliminate the disadvantages of the prior art and to provide a fluorine-free opal glass. The object of the invention is achieved by the fact that the opal glass as an opacifying component contains phosphorus compounds instead of fluorine compounds, and by the contents of the other constituent components being optimized.

Närmare bestämt åstadkommer uppfinningen ett opal- glas, som kännetecknas därav, att det har följande samman- sättning, räknat som oxider av ingående beståndsdelarna 55 -65 vikt% S102 2 - 6 vikt% Al2O3 10 -17 vikt% Na20 2 -10 vikt% Ca0 0,1- 6 vikt% Ba0 0,1- 6 vikt% Zn0 l - 8 vikt% 8203 4 -l2 vikt% P205 0,1- 3 vikt% Li20 0,1- 3 vikt% Sb2O3, varvid viktförhållandet Cao:BaO:ZnO är ca 8-l2:0,5-1:3-7 och varvid summan av de ingående bestånds- delarnas viktmängder är 100%, och att opalglaset har en värmeutvidgningskoefficient inom temperaturområdet zo-3oo°c av s-11 x 1o'6°c'1 Det föredrages vid uppfinningen att opalglaset har följande sammansättning 10 15 20 25 30 35 502 937 3 56 -60 vikt% S102 3 - 5 vikt% Al2O3 12 -14 vikt% Na2O 4 - 8 vikt% CaO 0,1- 2 vikt% BaO 2 - vikt% ZnO 3 - 6 vikt% BZO3 7 -10 vikt% P2O5 0,5- 1,5 vikt% Li2O 0,1- 1 vikt% Sb2O3.More particularly, the invention provides an opal glass which is characterized in that it has the following composition, calculated as oxides of the constituent constituents 55-65% by weight of S102 2-6% by weight of Al Ca0 0.1-6% by weight Ba0 0.1-6% by weight Zn0 1-8% by weight 8203 4-12% by weight P2 O5 0.1-3% by weight Li2O 0.1-3% by weight Sb2O3, the weight ratio Cao: BaO: ZnO is about 8-12: 0.5-1: 3-7 and the sum of the weight amounts of the constituent constituents is 100%, and that the opal glass has a coefficient of thermal expansion within the temperature range zo-300 ° c of s-11 x It is preferred in the invention that the opal glass has the following composition 10 60 20% 30 50 50 937 35 56 -60 wt% S10 2 3 - 5 wt% Al 2 O 3 12 -14 wt% Na 2 O 4 - 8 wt% CaO , 1-2% by weight BaO 2 -% by weight ZnO 3-6% by weight BZO3 7 -10% by weight P2O5 0.5-1.5% by weight Li2O 0.1- 1% by weight Sb2O3.

Genom uppfinningen är det möjligt att åstadkomma som har en värmeutvidgningskoefficient inom tem- a-n x 1o'6°c'l, dvs en varme- överensstämmer väl med den hos Opalglaset enligt uppfinningen har härigenom god förenlighet med klarglas, vilket är viktigt vid i synner- het framställning av belysningsglas. opalglas, deras egenskaper närmare.By means of the invention it is possible to achieve which has a coefficient of thermal expansion within the range x 10 6 ° c'l, i.e. a heat conformity well with that of the Opal glass according to the invention thereby has good compatibility with clear glass, which is important in hot production of lighting glass. opal glass, their properties closer.

Glasets huvudbestàndsdel, SiO2, är en glasbildare, som utgör nätverket i glasstrukturen. Halten av SiO2 i glaset enligt uppfinningen är ca 55-65 ökar glasets viskositet i oönskad grad och glaset blir svàrt att smälta. Av dessa anledningar har halten av SiO2 valts att ligga inom det angivna omràdet. 10 15 20 25 30 35 4 Både Na2O och Li2O påverkar glasets viskositet och dess värmeutvidgningskoefficient a, samt i viss mån även kristalltillväxten. Om halten av dessa ämnen är alltför låg höjs glasets viskositet och dess smält- och bearbet- ningsegenskaper försämras. Vidare sänks värmeutvidgnings- koefficienten a så att opalglaset inte kan förenas med standardkristallglas. Om däremot halten av ämnena är allt- för hög sänks glasets viskositet i ej önskvärd grad, och glaset blir korrosivt och kristalltillväxten i glaset blir otillräcklig. Av dessa anledningar är halten Na2O vid upp- finningen ca 10-17 vikt%, företrädesvis ca 12-14 vikt%, och halten Li2O ca 0,1-3 vikt%, företrädesvis ca 0,5-1,5 vikt%.The main constituent of glass, SiO2, is a glass former, which forms the network in the glass structure. The content of SiO2 in the glass according to the invention is about 55-65, the viscosity of the glass increases to an undesirable degree and the glass becomes difficult to melt. For these reasons, the content of SiO2 has been chosen to be within the specified range. Both Na2O and Li2O affect the viscosity of the glass and its coefficient of thermal expansion a, and to some extent also the crystal growth. If the content of these substances is too low, the viscosity of the glass is increased and its melting and processing properties deteriorate. Furthermore, the coefficient of thermal expansion a is lowered so that the opal glass cannot be combined with standard crystal glass. If, on the other hand, the content of the substances is too high, the viscosity of the glass is reduced to an undesirable degree, and the glass becomes corrosive and the crystal growth in the glass becomes insufficient. For these reasons, the content of Na 2 O in the invention is about 10-17% by weight, preferably about 12-14% by weight, and the content of Li 2 O is about 0.1-3% by weight, preferably about 0.5-1.5% by weight.

Al2O3 ökar glasets kemiska resistens och viskositet, varvid en alltför låg halt av Al203 medför sämre kristall- tillväxt och sämre kemisk resistens, medan en alltför hög halt medför oönskat hög viskositet och försämrad smältbar- het av glaset. Av dessa anledningar är halten Al2O3 i gla- set enligt uppfinningen ca 2-6 vikt%, företrädesvis ca 3-5 vikt%.Al2O3 increases the chemical resistance and viscosity of the glass, whereby too low a content of Al2O3 leads to poorer crystal growth and poorer chemical resistance, while too high a content leads to undesirably high viscosity and impaired digestibility of the glass. For these reasons, the Al2O3 content in the glass according to the invention is about 2-6% by weight, preferably about 3-5% by weight.

Cao, Bao, och ZnO påverkar glasets kristallinitet, varvid CaO påverkar kristallformen, BaO påverkar kristall- storleken och ZnO påverkar kristallisationshastigheten.Cao, Bao, and ZnO affect the crystallinity of the glass, with CaO affecting the crystal shape, BaO affecting the crystal size, and ZnO affecting the crystallization rate.

För att dessa parametrar skall vara gynnsamma är halten CaO vid uppfinningen ca 2-10 vikt%, företrädesvis ca 4-8 vikt%, halten BaO ca 0,1-6 vikt%, företrädesvis ca 0,1-2 vikt%, och halten ZnO ca 0,1-6 vikt%, företrädesvis ca 2-5 vikt%. Genom att avväga det inbördes viktförhållan- det mellan dessa komponenter kan dessutom de nämnda para- metrarna kristallform, kristallstorlek och kristallisa- tionshastighet optimeras, och vid uppfinningen gäller härvid att viktförhållandet CaO:BaO:ZnO är ca 8-l2:O,5-1:3-7, mera föredraget ca lO:l:5.In order for these parameters to be favorable, the CaO content in the invention is about 2-10% by weight, preferably about 4-8% by weight, the BaO content is about 0.1-6% by weight, preferably about 0.1-2% by weight, and the content ZnO about 0.1-6% by weight, preferably about 2-5% by weight. In addition, by balancing the mutual weight ratio between these components, the mentioned parameters crystal shape, crystal size and crystallization rate can be optimized, and in the invention the weight ratio CaO: BaO: ZnO is about 8-112: 0.5-1. : 3-7, more preferably about 10: 1: 5.

B2O3 påverkar även i viss mån glasets kristalltill- växt, men framförallt dess värmeutvidgningskoefficient a.B2O3 also affects the crystal growth of the glass to some extent, but above all its coefficient of thermal expansion a.

En alltför låg halt av B2O3 medför sämre kontroll av gla- sets smältbarhet och kristallstorlek, medan en alltför hög 10 15 20 25 30 35 klarglas. resistens. Av dessa skäl ligger halten av P20 i glaset enligt uppfinningen vid ca 4-12 vikt%, företrädesvis ca 7-10 vikt%. är helt ogiftig. Av dessa anledningar är halten av Sb2O3 i 10 15 20 25 30 35 100,0 10,7 12,3 18,0 1,3 6,0 20,2 26,2 4,9 1,0 5,0 delar S102 (sand) Al(0H)3 (aluminiumhydrat) Na2CO3 (soda) CaCO3 (kalk) BaC03 (bariumkarbonat) ZnO (zinkoxid) Na2B407-lOH2O (borax) delar Na5P3O1O (natriumtripolyfosfat) delar Li2CO3 (litiumkarbonat) delar Sb2O3 (antimonoxid) delar delar delar delar delar delar delar NaNO3 (natronsalpeter).Too low a content of B2O3 leads to poorer control of the glass's digestibility and crystal size, while an excessively high 10 15 20 25 30 35 clear glass. resistance. For these reasons, the content of P 2 O in the glass according to the invention is at about 4-12% by weight, preferably about 7-10% by weight. is completely non-toxic. For these reasons, the content of Sb2O3 in 10 15 20 25 30 35 100.0 10.7 12.3 18.0 1.3 6.0 20.2 26.2 4.9 1.0 5.0 parts S102 ( sand) Al (OH) 3 (aluminum hydrate) Na2CO3 (soda) CaCO3 (lime) BaCO3 (barium carbonate) ZnO (zinc oxide) Na2B407-10H2O (borax) parts Na5P3O1O (sodium tripolyphosphate) parts Li2CO3 (lithium carbonate parts parts Sb2) parts parts parts parts NaNO3 (sodium nitrate).

I stället för att tillföra glasets innehåll av P2O5 1 form av natriumtripolyfosfat kan man vid uppfinningen använda andra lämpliga P2O5-källor, såsom Ca3(PO4)2, NaH2PO4, och Na2HPO4.2H20.Instead of adding the P2O5 content of sodium tripolyphosphate to the glass, other suitable P2O5 sources can be used in the invention, such as Ca3 (PO4) 2, NaH2PO4, and Na2HPO4.2H2O.

Den i degelugnen införda glasmängen smältes till glas vid l420°C och prover uttogs av det smälta glaset. Det färdiga opalglaset hade följande teoretiska sammansättning i vikt%: 57,9% S102 4,l% Al203 l3,3% Na2O 5,8% CaO 0,6% BaO 3,5% ZnO 4,3% 8,7% l,2% O,6% B2°3 Pzos Lizo sn o Opašgïaset var vitt och innehöll inga kristaller, som var så stora att de syntes för blotta ögat. Ljustransmis- sionen understeg 0,5%. Glasets transformationstemperatur (Tg) var 5l8°C och dess värmeutvidgningskoefficient a var 9,65 X 1o'6°c'1.The amount of glass introduced into the crucible furnace was melted into glass at 124 ° C and samples were taken from the molten glass. The finished opal glass had the following theoretical composition in% by weight: 57.9% S102 4.1% Al2 O3 1.3% Na2O 5.8% CaO 0.6% BaO 3.5% ZnO 4.3% 8.7% l , 2% 0, 6% B2 ° 3 Pzos Lizo sn o Opašgïaset was white and contained no crystals, which were so large that they were visible to the naked eye. Light transmission was less than 0.5%. The transformation temperature (Tg) of the glass was 518 ° C and its coefficient of thermal expansion a was 9.65 X 10 '6 ° c'1.

Efter smältningen av glaset undersöktes degelugnen och någon onormal korrosion av de elektriska upphettnings- elementen kunde ej konstateras.After melting the glass, the crucible furnace was examined and no abnormal corrosion of the electric heating elements could be detected.

Claims (3)

1. 0 15 20 25 30 35 llflw vs/ PATENTKRAV k ä n n e t e c k n a t därav, att det räknat som oxider av de in- l. Opalglas, har följande sammansättning, gáende beståndsdelarna 55 -65 vikt% S10 2 2 - 6 vikt% Al203 10 -l7 vikt% Na2O 2 -10 vikt% CaO 0,1- 6 vikt% BaO 0,1- 6 vikt% ZnO l - 8 vikt% BZO3 4 -12 vikt% PZOS 0,1- 3 vikt% Li2O 0,1- 3 vikt% Sb2O3, varvid viktförhállandet CaO:BaO:ZnO är ca 8-l2:O,5-1:3-7 och varvid summan av de ingående bestándsdelarnas vikt-1. 0 15 20 25 30 35 ll fl w vs / PATENT CLAIMS characterized by the fact that it is calculated as oxides of the in- 1. Opal glass, has the following composition, the constituent constituents 55 -65 wt% S10 2 2 - 6 wt% Al 2 O 3 10 -17% by weight Na2O 2 -10% by weight CaO 0.1- 6% by weight BaO 0.1-6% by weight ZnO 1-8% by weight BZO3 4 -12% by weight PZOS 0.1-3% by weight Li2O 0.1 - 3% by weight of Sb 2 O 3, the weight ratio CaO: BaO: ZnO being about 8-12: 0, 5-1: 3-7 and wherein the sum of the constituents of the constituents 2. Opalglas enligt kravet l, k ä n n e t e c k n a t därav, att det har följande sammansättning 55 -60 vikt% S102 3 - 5 vikt% Al203 12 -14 vikt% Na2O 4 - 8 vikt% CaO 0,1- 2 vikt% BaO 2 - 5 vikt% ZnO 3 - 6 vikt% 8203 7 -lO v1kt% P2O5 0,5- 1,5 vikt% Li2O 0,1- 1 vikt% Sb2OOpal glass according to claim 1, characterized in that it has the following composition 55 -60% by weight S102 3 - 5% by weight Al2 O3 12 -14% by weight Na2O 4 - 8% by weight CaO 0.1-2% by weight BaO2 - 5 wt% ZnO 3 - 6 wt% 8203 7 -10 w1% P2O5 0.5- 1.5 wt% Li2O 0.1- 1 wt% Sb2O 3.3.
SE9402832A 1994-08-24 1994-08-24 opal Glass SE502937C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9402832A SE502937C2 (en) 1994-08-24 1994-08-24 opal Glass
PCT/SE1995/000948 WO1996006052A1 (en) 1994-08-24 1995-08-21 Opal glass
AU33584/95A AU3358495A (en) 1994-08-24 1995-08-21 Opal glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9402832A SE502937C2 (en) 1994-08-24 1994-08-24 opal Glass

Publications (3)

Publication Number Publication Date
SE9402832D0 SE9402832D0 (en) 1994-08-24
SE9402832L SE9402832L (en) 1996-02-25
SE502937C2 true SE502937C2 (en) 1996-02-26

Family

ID=20395018

Family Applications (1)

Application Number Title Priority Date Filing Date
SE9402832A SE502937C2 (en) 1994-08-24 1994-08-24 opal Glass

Country Status (3)

Country Link
AU (1) AU3358495A (en)
SE (1) SE502937C2 (en)
WO (1) WO1996006052A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2749842B1 (en) * 1996-06-14 1998-07-31 Saint Gobain Emballage OPALINE GLASS COMPOSITIONS
CN104556688B (en) * 2014-12-25 2017-05-10 河北省沙河玻璃技术研究院 Emulsion opal glass and preparation method thereof
CZ2016698A3 (en) * 2016-11-09 2017-12-06 Univerzita Tomáše Bati ve Zlíně Ecological alabaster glass
FR3068034B1 (en) * 2017-06-27 2020-11-06 Soc Nouvelle Vermont Financement OPAL GLASS, PROCESS FOR MANUFACTURING OPAL GLASS, TINTED BULBS AND TUBES OBTAINED WITH SUCH GLASS.
WO2023101863A1 (en) * 2021-11-30 2023-06-08 Corning Incorporated Light diffusing glass ceramics

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1453996A (en) * 1965-08-17 1966-07-22 Saint Gobain Opal glasses with phosphates

Also Published As

Publication number Publication date
AU3358495A (en) 1996-03-14
SE9402832L (en) 1996-02-25
SE9402832D0 (en) 1994-08-24
WO1996006052A1 (en) 1996-02-29

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