WO2021063834A1 - Glasartikel, verfahren zu deren herstellung und verwendungen - Google Patents
Glasartikel, verfahren zu deren herstellung und verwendungen Download PDFInfo
- Publication number
- WO2021063834A1 WO2021063834A1 PCT/EP2020/076928 EP2020076928W WO2021063834A1 WO 2021063834 A1 WO2021063834 A1 WO 2021063834A1 EP 2020076928 W EP2020076928 W EP 2020076928W WO 2021063834 A1 WO2021063834 A1 WO 2021063834A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- glass
- ppm
- less
- glass article
- refining
- Prior art date
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
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
-
- 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
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
-
- 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
- C03C3/083—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound
- C03C3/085—Glass compositions containing silica with 40% to 90% silica, by weight containing aluminium oxide or an iron compound containing an oxide of a divalent metal
-
- 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
- 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
- C03C3/00—Glass compositions
- C03C3/04—Glass compositions containing silica
- C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
- C03C3/11—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen
- C03C3/112—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine
- C03C3/115—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron
- C03C3/118—Glass compositions containing silica with 40% to 90% silica, by weight containing halogen or nitrogen containing fluorine containing boron containing aluminium
Definitions
- the present invention relates to glass articles, processes for their production and uses.
- the glass articles are suitable for use as display glasses for cell phones and tablet computers, for example.
- glass is the material of choice for displays. In order for glass to be bendable, it must be made available in small thicknesses. There are already various methods of manufacturing glasses with a very small thickness. Glasses with very small thicknesses can be produced in a drawing process.
- the drawing processes include the down draw process (also known as the “slot down draw” process) and the overflow fusion process (also known as the “overflow down draw” process). What these processes have in common is that platinum components are used in the corresponding manufacturing plants.
- platinum particles from precious metal components in the production facilities come loose and are found on or in the thin glass articles.
- these platinum particles are less critical than in particularly thin glass articles because of their small size.
- a single platinum particle with a size of only 5 ⁇ m in diameter with a glass 50 ⁇ m thick can represent a very significant defect, since the surfaces around the enclosed defect can bulge.
- aluminosilicate glasses melt at comparatively high temperatures. They are more difficult to purify than many other glasses because they only start with reach a common lauter viscosity (200 to 500 dPas) at very high temperatures. In particular, it has proven difficult to achieve a satisfactory refining effect without the use of toxic refining agents such as arsenic and antimony oxides. Many alternative refining agents release refining gas if the temperature is too low. The viscosity of the glass is then still too high, so that the bubbles formed do not rise quickly enough or not at all.
- Alkali metal oxides reduce the melting and refining temperature of a glass, so that the desired refining viscosity is achieved even at lower temperatures. Glasses that have a high proportion of alkali metal oxides, however, show a high corrosion potential against tub stones and precious metal components. Precious metal in particular, which is found in many components in glass production, e.g. in the form of pipes for transporting the molten glass from the melting tank to the homogenization and shaping system, is severely attacked. This leads to short system downtimes and thus to high costs.
- WO 2009/108285 A2 teaches complex refining agents for aluminosilicate glasses that are based on the use of multivalent metal oxides and water. There glasses with bubble concentrations of up to one bubble per cm 3 of glass are obtained. Tin and cerium oxides are used as multivalent metal oxides.
- WO 2006/115997 A2 describes systems for producing glass which contain precious metals, in particular platinum.
- the effect of “hydrogen permeation blistering” is described, ie the formation of bubbles on the inside of platinum parts due to the permeability of these materials for hydrogen.
- the use of tin oxide is particularly recommended there, as it is supposed to absorb bubbles that are still present when the melt cools.
- iodine, bromine or chlorine should be used in very small quantities together with a control of the hydrogen partial pressure outside the system.
- aluminosilicate glasses of excellent quality without having to use complex combinations of refining agents or high expenditure on equipment.
- the glasses should also be free of arsenic and antimony and attack the material of the system as little as possible. Description of the invention
- the invention relates to a glass article made of an aluminosilicate glass with at least one halogen with a refining effect in the range from 500 to 8,000 ppm and an Sn content of less than 500 ppm, the glass less than 100 ppm As and less than 100 ppm Sb having.
- the invention in a second aspect, relates to a glass article made of an aluminosilicate glass, where the glass article has no more than 5 platinum particles with diameters greater than 5 ⁇ m per kilogram of glass, the aluminosilicate glass having less than 100 ppm As and less than 100 ppm Sb.
- the invention relates to a glass article made of an aluminosilicate glass, where the aluminosilicate glass has less than 100 ppm As, less than 100 ppm Sb and less than 500 ppm or less than 100 ppm Sn and where a quotient A in the range of 1, 5 to 8.5, where: mAl203
- rri Ai 203 is the mass fraction of Al2O3 in the aluminosilicate glass in% by weight; mpso is the sum of the mass fractions of the alkali metal oxides Na 2 O, K2O and U2O in% by weight; rri R o is the sum of the mass fractions of the alkaline earth metal oxides MgO, CaO, BaO and SrO in percent by weight; mci is the mass fraction of chlorine in% by weight; mi is the mass fraction of iodine in% by weight; and GTI BG is the mass fraction of bromine in% by weight.
- the invention relates to a glass article made of an aluminosilicate glass, where the aluminosilicate glass has less than 100 ppm As, less than 100 ppm Sb and less than 500 ppm, preferably less than 100 ppm Sn, and a total thickness variance of the glass article less than 5 pm.
- the aluminosilicate glass has at least one halogen with a refining effect, in particular selected from chlorine, bromine and iodine.
- Fluorine is not a halogen with a purifying effect, as it is already volatile at too low temperatures.
- the glass can still contain fluorine.
- the preferred halogen with a purifying effect is chlorine.
- the content of the halogen having a refining effect may be at least 100 ppm, at least 300 ppm, or at least 500 ppm. In one embodiment, the halogen content is at most 8000 ppm, at most 6500 ppm, at most 5000 ppm, not more than 3000 ppm, not more than 2500 ppm or not more than 1000 ppm.
- Refining halogens serve as refining agents to remove bubbles during manufacture of the glass article.
- the refining halogen can be added in different forms. In one embodiment, it is added to the mixture as a salt with an alkali metal or alkaline earth metal cation. In one embodiment, the halogen is used as a salt and the cation in the salt corresponds to a cation present as an oxide in the aluminosilicate glass.
- halogens are used as refining agents for aluminosilicate glasses, very good qualities can be obtained. Due to their relatively low boiling point, halogens release refining gas relatively early in the melting process. In addition, in contrast to multivalent metal oxides, halogens with a refining effect cannot absorb oxygen when the melt cools down. It was therefore common opinion that halogens would have to be used in combination with other refining agents, in particular with multivalent metal oxides, especially Sn0 2 , in order to achieve a satisfactory result. The inventors of the present invention have found that very good refining results can also be achieved without using tin, arsenic and antimony oxides.
- the aluminosilicate glass is preferably free from such refining agents.
- one or more additional refining agents can be used in addition to the halogen with a refining effect.
- cerium and / or iron oxide the glass therefore contains CeC> 2 and / or Fe 2 O 3 .
- CeC> 2 can for example be contained in a proportion range of up to 2,000 ppm or up to 1,000 ppm. This amount alone is not enough for the purification. Together with the halogen with a purifying effect, however, a very good result can be achieved.
- the proportion of CeC> 2 can be at least 100 ppm.
- Fe2Ü3 can for example be used in a proportion range of up to 300 ppm. This amount alone is not enough for the purification. Together with the halogen with a purifying effect, however, a very good result can be achieved.
- the proportion of Fe2Ü3 can be at least 100 ppm.
- the aluminosilicate glass of the glass article can have an Sn content of less than 500 ppm, in particular less than 300 ppm, less than 100 ppm, less than 50 ppm or less than 10 ppm.
- the glass has less than 100 ppm arsenic, in particular less than 50 ppm or less than 10 ppm.
- a glass which has less than 100 ppm antimony, less than 50 ppm antimony or less than 10 ppm antimony is preferred.
- Arsenic and antimony are poisonous and dangerous for the environment. They are therefore to be avoided as part of the glass article and in any case no longer desired or not permitted in many applications.
- the glass article has no more than 5 platinum particles with diameters of more than 5 ⁇ m, in particular more than 10 ⁇ m, per kilogram of glass. In particular, this applies to particles with a diameter of 5 to 100 ⁇ m. In one embodiment, the glass article has no more than 3, no more than 1 or no such platinum particles per kilogram of glass. Even a platinum particle with a diameter of more than 5 ⁇ m can lead to considerable errors in the production of thin glass articles.
- the diameter of platinum particles of this size can be determined microscopically, whereby the number given here in micrometers corresponds to the largest diameter of the particles in each case.
- the glass article has less than 10 of said platinum particles per square meter of glass article, in particular less than 8, less than 6, less than 4, less than 3, less than 2, less than 1 or even less than 0.5.
- a quotient A is in the range from 1.5 to 8.5, where the following applies: mAl2Q3 mRO + m R2Q mci + m j + mBr
- rri Ai 203 is the mass fraction of Al2O3 in the aluminosilicate glass in% by weight; m R 2o is the sum of the mass fractions of the alkali metal oxides Na 2 O, K2O and U2O in% by weight; rri R o is the sum of the mass fractions of the alkaline earth metal oxides MgO, CaO, BaO and SrO in percent by weight; mci is the mass fraction of chlorine in% by weight; mi is the mass fraction of iodine in% by weight; and GTI BG is the mass fraction of bromine in% by weight.
- Quotient A is particularly preferably at least 1.5 or at least 2.0, in particular at least 2.5. Quotient A is preferably at most 8.5, at most 7 or at most 5.
- the glass articles of the present invention have very low levels of bubbles.
- the number of bubbles with a length of more than 20 ⁇ m in the glass article less than 100 bubbles per kilogram of glass, in particular less than 50 bubbles per kilogram of glass, less than 20 bubbles per kilogram of glass or less than 10 bubbles per kilogram of glass.
- the length of a bubble is its longest diameter.
- the glass article has a thickness of less than 500 ⁇ m, less than 350 ⁇ m, less than 250 ⁇ m, less than 200 ⁇ m or less than 100 ⁇ m.
- the thickness of the glass article is preferably at least 5 ⁇ m, at least 10 ⁇ m or at least 15 ⁇ m. In principle, the relationship found here naturally also works with thicker glasses, so that in one embodiment the glass article has a thickness of 0.1 to 2 mm, in particular 0.2 to 1 mm.
- the glass article is preferably a thin sheet of glass, a glass wafer or a glass ribbon.
- the glass article is preferably a flat glass body with two essentially plane-parallel sides, which are significantly larger in terms of their surfaces than all the other sides.
- the glass article can be in the form of a glass ribbon which can be wound onto a roll.
- the glass article can be rectangular, round, or any other shape.
- a rolled up glass ribbon can have a length of 10 to 1000 m.
- the glass article can preferably be produced using a drawing process, in particular using a down draw, overflow fusion or redraw process. With this drawing process, an excellent surface quality can be produced, which is characterized by a particularly low roughness. Such surfaces are also called “fire polished”.
- the glass article has at least one fire-polished surface, in particular at least the two largest sides of the article are fire-polished.
- the article has a surface quality with a roughness R a of at most 10 nm, at most 1 nm or at most 0.5 nm.
- the roughness R a is determined using an Atomic Force Microscope (AFM).
- the glass article is preferably particularly uniform in terms of the thickness of the article because of the good quality in terms of platinum particles and bubbles.
- the article can have a total thickness variation (TTV, total thickness variation) of less than 5 pm, in particular less than 3 pm, less than 2 pm or even less than 1 pm.
- the total thickness variance is the difference between the greatest thickness and the smallest thickness of the glass article; it can be determined according to SEMI 1530 GBIR.
- the specified total thickness variance preferably applies to an area of the glass article of at least 50 cm 2 , at least 100 cm 2 , at least 250 cm 2 , at least 800 cm 2 or at least 1500 cm 2 .
- the specified total thickness variance can relate to an area of up to 10,000 cm 2 or up to 5,000 cm 2 .
- the stated TTV applies to the entire glass article.
- a Thin glass articles with many platinum particles will not achieve this total thickness variance, since the particles lead to bulges in the glass, i.e. to sections with increased thickness.
- the glass article can have an area of at least 10 cm 2 , at least 50 cm 2 , at least 100 cm 2 , at least 200 cm 2 or at least 400 cm 2 . In one embodiment, the glass article can have an area of up to 25 m 2 , up to 15 m 2 , up to 100,000 cm 2 , up to 60,000 cm 2 , up to 10,000 cm 2 or up to 2,000 cm 2 . The area of the glass article is its length multiplied by its width.
- the aluminosilicate glass has less than 100 ppm fluorine or is free of fluorine. Fluorine can evaporate during production and thus result in an inhomogeneous glass. In one embodiment, however, the aluminosilicate glass has fluorine, since it serves as a flux during melting. In one embodiment, the glass contains fluorine in a proportion of at least 0.05% by weight. In order to avoid the disadvantages mentioned, however, its content can be limited to a maximum of 0.5% by weight.
- the aluminosilicate glass can contain alkali metal oxide.
- the aluminosilicate glass can contain lithium oxide, sodium oxide and / or potassium oxide (alkali metal oxides) in a total proportion of more than 0.5% by weight or more than 2% by weight or more than 5% by weight or more than 10% by weight. % exhibit.
- the aluminosilicate glass has less than 100 ppm lithium or is free of lithium. Lithium affects the chemical resistance of the glass article and can attack crucible materials.
- the ratio of the refining temperature TL in ° C., at which the aluminosilicate glass has its refining viscosity, and the temperature Ts (Haiogen) in ° C. at the boiling point of the halogen compound used for refining, for example NaCl, is at most 1.2 or at most 1.15.
- the ratio Ti_ / Ts (Haiogen) is preferably greater than 1.00 or greater than 1.05. It has been found that if this ratio is adhered to, good lautering results are achieved. This is surprising, because it was the doctrine that the refining temperature and the boiling temperature of the refining agent should be about the same. Therefore the halogens were not expected to have a good purifying effect.
- the refining temperature is the temperature at which the glass has a viscosity of 300 dPas. This does not mean that the glass was refined at that temperature. Rather, the temperature corresponding to the viscosity of 300 dPas is representative of the temperature at which the glass has a viscosity suitable for refining.
- the glasses of this invention can be refined in a viscosity range of 200 to 500 dPas.
- the viscosity of a glass can be with a rotational viscometer, for example according to DIN ISO 7884-2: 1998-2. The dependence of the viscosity on the temperature is determined using the VFT curve (Vogel-Fulcher-Tammann equation).
- the aluminosilicate glass has a refining temperature of at least 1,500 ° C, in particular at least 1,550 ° C.
- the refining temperature of the aluminosilicate glass can be up to 1,700 ° C or up to 1,650 ° C.
- the aluminosilicate glass has S1O2 in a proportion of at least 40% by weight and / or a maximum of 75% by weight.
- S1O2 contributes to the desired viscosity properties and hydrolytic resistance.
- the proportion of Al2O3 can preferably be at least 10% by weight and / or at most 30% by weight.
- a certain amount of AI2O3 enables the desired chemical temperability.
- the aluminosilicate glass contains at least 9% by weight Na 2 O.
- the Na 2 O content can be limited to up to 18% by weight or up to 16% by weight.
- the glass contains no B2O3 or only a little B2O3.
- B2O3 has a positive influence on the hydrolytic resistance. However, it has a negative effect on the chemical temperability. Its content is therefore preferably limited to a maximum of 20% by weight, a maximum of 10% by weight, a maximum of 5% by weight or a maximum of 2% by weight.
- a preferred aluminosilicate glass containing alkali metal oxide has the following components:
- the aluminosilicate glass has a beta-OH content, expressed as absorption coefficient a, of a maximum of 0.32 mm ⁇ 1 .
- the beta-OH content, expressed as the absorption coefficient a is a measure of the water content of the glasses.
- the water content of the aluminosilicate glass is relatively low compared to the prior art.
- the absorption coefficient a is determined by infrared spectroscopy as follows. First, an IR spectrum is recorded and determines the transmission minimum in the wavelength range from 2.7 to 3.3 pm.
- the absorption coefficient at the wavelength of the minimum is calculated as follows.
- d is the thickness of the glass
- T the net transmission of the glass in the IR spectrum at the minimum.
- the aluminosilicate glass has less than 0.0001% by weight of Nh.
- the aluminosilicate glass has a cooling state which corresponds to a cooling of the glass during manufacture through a temperature range of 50 ° C. above Tg to 100 ° C. below Tg with a cooling rate of at least 300 ° C./min.
- the cooling state of the glass corresponds to a cooling rate through this temperature range of at least 1,000 ° C./min.
- the cooling rate can even be up to 6,000 ° C / min.
- the aluminosilicate glass can be cooled so quickly that it has a comparatively high fictitious temperature, e.g. with the specified cooling rates around Tg.
- a high fictitious temperature is associated with a refractive index that is lower than a refractive index after fine cooling of the same glass composition.
- a high fictitious temperature enables a comparatively high temperability and a slightly reduced density.
- the aluminosilicate glass can have a density of less than 2.5 g / cm 3 .
- the glass has a refractive index n D of 1.48 to 1.55.
- an aluminosilicate glass which can be produced in particular by a method according to the invention, with a refractive index n D of at most 1.55 and a thickness of less than 500 ⁇ m is preferred.
- the refractive index of the aluminosilicate glass can be at least 0.0001 smaller than the refractive index after fine cooling.
- the refractive index of the glass is particularly preferably at least 0.0004, particularly preferably at least 0.0008, smaller than the refractive index after fine cooling.
- the refractive index is even smaller by at least 0.001 or 0.002 than the refractive index after fine cooling.
- the transformation temperature T G of the aluminosilicate glass is 580 to 650.degree.
- the glass article or the aluminosilicate glass is chemically hardenable, in particular having a diffusivity in the range of at least 14 pm 2 / h, in particular at least 18 pm 2 / h, or at least 20 pm 2 / h.
- the diffusivity can be limited to a maximum of 60 pm 2 / h, a maximum of 45 pm 2 / h or a maximum of 30 pm 2 / h.
- the diffusivity D is a measure of the sensitivity of the glass article to chemical toughening. It can be calculated from the depth of the compressive stress layer (DoL, depth of ion exchanged layer) and the prestressing time t. It is
- the diffusivity is given with pre-tensioning with KNO3 at 450 ° C for 1 hour. Diffusivity does not mean that the article has to be biased, but rather describes its susceptibility to it. A glass that cools faster is more susceptible to chemical tempering; it has a higher diffusivity than a glass that cools more slowly.
- the glass article is toughened.
- the compressive stress on at least one surface of the glass article, in particular on one or both of the largest surfaces of the glass article is at least 100 MPa, preferably at least 200 MPa, in particular at least 300 MPa or at least 400 MPa.
- the compressive stress on at least one surface of the glass article, in particular on one or both of the largest surfaces of the glass article is a maximum of 2,000 MPa, a maximum of 1,600 MPa, a maximum of 1,400 MPa, a maximum of 1,000 MPa, in particular a maximum of 800 MPa or a maximum of 750 MPa.
- the compressive stress can preferably be at least 100 MPa, at least 300 MPa or at least 500 MPa.
- the desired compressive stresses are introduced in a manner known per se to the person skilled in the art by exchanging smaller ions for larger ions in the surface of the glass.
- Sodium is preferably replaced by potassium, in particular using KNO3.
- the depth of the compressive stress layer (DoL) can be up to 1/3 of the glass thickness, in particular up to 25%, up to 20% or up to 15% of the glass thickness. DoL can be at least 1% or at least 10% of the glass thickness.
- the article can be biased on one or both sides.
- the use of a glass article according to this invention in a mobile or portable terminal device, in particular in a mobile phone, a tablet computer or a smart watch, is also in accordance with the invention.
- the invention also relates to a method for producing a glass article, in particular a glass article described above, with the following steps
- a batch is provided for an aluminosilicate glass with an Sn content of less than 100 ppm, in particular for an aluminosilicate glass according to the composition described herein.
- the drawing method can be selected from a vertical drawing method such as down draw method, up draw method, redrawing and overflow fusion method, or a horizontal drawing method such as float method.
- halogen with a refining effect can be used in the form of a halogen compound, in particular a halide compound.
- Suitable halide compounds are, in particular, salts of chlorine anions, bromine anions and / or iodine anions with alkali metal cations or alkaline earth metal cations.
- Preferred examples are NaCl, NaBr, Nal, KCl, KBr, Kl, MgCb, Mgb, MgBr2, CaCb, Cab, CaBr2 and combinations thereof.
- Other preferred examples are BaCb, BaBr2, Bab, SrCb, SrBr2, Srb, and combinations thereof.
- the amount of halogen used can be at least 100 ppm, at least 300 ppm or at least 500 ppm, the amount given being based on the mass fraction of the halogen in the mixture.
- the mass fraction of the halogen with refining effect in the amount used is at most 10,000 ppm, at most 8,000 ppm, at most 6,000 ppm, at most 5,000 ppm or at most 3,000 ppm.
- the refining halogen serves as a refining agent for removing bubbles during the manufacture of the glass article.
- the halogen can be added in different forms. In one embodiment, it is added to the mixture in the form of a halide compound, for example as a salt with an alkali metal or alkaline earth metal cation.
- the halogen is used as a salt and the cation in the salt corresponds to a cation present as an oxide in the aluminosilicate glass.
- Fluorine compound According to the invention, fertilizers are not one of the halogen compounds that are used for refining, since their boiling points are too low and therefore no adequate refining effect can be achieved. Nevertheless, the mixture can contain fluorine or fluoride.
- the refining takes place at a temperature at which the melt has a viscosity in the range from 200 to 500 dPas, in particular about 300 dPas.
- the refining temperature (in ° C.) is preferably in a ratio to the boiling point (in ° C.) of the halogen compound used of at least 0.8 and at most 1.4, preferably at least> 1 and at most 1.2 or at most 1.15.
- the melting and / or refining of the glass is preferably carried out at temperatures of at least 1,400 ° C, preferably at least 1,500 ° C. In particular, the temperature is at most 1,700 ° C, preferably at most 1,650 ° C.
- the melt can be in contact at least temporarily with a platinum component, for example a platinum tube or a platinum stirrer.
- a platinum component for example a platinum tube or a platinum stirrer.
- the advantages of the invention with regard to the only very slight wear of platinum can thus be optimally used.
- Platinum has great advantages in glass production. It is only slightly corrosive, resistant to high temperatures, at the same time mechanically stable and conductive, which means that it can also be heated directly. The invention he allows the advantageous use of platinum even with particularly corrosive glasses.
- Shaping the glass article includes, in particular, drawing the melt or the glass into a thin glass article.
- the glass can be drawn to very small thicknesses, such as ⁇ 100 ⁇ m. If platinum particles are present in the glass, they will appear on the surface during the drawing process and affect the quality of the glass.
- the glass is an aluminosilicate glass that has the following components: In one embodiment, the glass is an aluminosilicate glass that has the following components:
- the glass is an aluminosilicate glass that has the following components:
- the glass is an aluminosilicate glass that has the following components: If necessary, coloring oxides can be added to the glass, such as Nd 2 0 3 , Fe 2 0 3 , CoO, NiO, V2O5, Mhq2, Ti0 2 , CuO, CeÜ2, Cr 2 0 3 or combinations thereof.
- the glass is preferably free of Sn, Sb and / or As.
- the glass is an aluminosilicate glass which has the following components: S1O250% by weight, Al2O3 12% by weight, B2O3 14% by weight, BaO 24% by weight. In one embodiment, the glass is an aluminosilicate glass that has the following components: S1O261% by weight, Al2O3 16% by weight, B2O38% by weight, MgO 3% by weight, CaO 8% by weight, BaO 4 Wt%.
- the glass is an aluminosilicate glass which has the following components: S1O261% by weight, Al2O3 17% by weight, B2O3 11% by weight, MgO 3% by weight, CaO 5% by weight, BaO 3% by weight.
- the glass article can be a thin glass ribbon or a glass film. It can have a thickness of less than 500 .mu.m, less than 350 .mu.m, preferably less than 250 .mu.m, preferably less than 100 .mu.m, particularly preferably less than 50 .mu.m. In one embodiment, the thickness is at least 3 ⁇ m, preferably at least 10 ⁇ m, particularly preferably at least 15 ⁇ m. Preferred thicknesses are 5, 10, 15, 25, 30, 35, 50, 55, 70, 80, 100, 130, 145, 160, 175, 190, 210, 280 or 330 pm.
- concentration unit ppm concentration unit
- this statement refers to any chemical form.
- the statement that the glass has an Sn content of less than 100 ppm means that the sum of the mass fractions of the Sn species present (e.g. Sn 2+ in SnO and Sn 4+ in SnÜ2) together does not amount to 100 ppm exceeds.
- non-essential amounts are amounts of less than 100 ppm, preferably less than 50 ppm and most preferably less than 10 ppm.
- Figure 1 shows the phase diagram of platinum and tin
- FIG. 2 is an SEM image of a sample of a noble metal tube which has been in contact with a Sn-containing molten glass for an extended period of time
- FIG. 3 is an SEM image of a sample of a noble metal tube which has been in contact with a Sn-containing molten glass for an extended period of time
- FIG. 4 is an SEM image of a sample of a noble metal tube which has been in contact with a Sn-containing molten glass for an extended period of time
- FIG. 5 is an SEM image of a sample of a noble metal tube which has been in contact with a Sn-containing molten glass for an extended period of time
- FIG. 6 is an SEM image of a sample of a noble metal tube which has been in contact with a Sn-containing molten glass for an extended period of time
- Figure 7 shows the appearance of platinum particles in Sn0 2 -containing glass
- Figure 8 shows the appearance of platinum particles in Sn0 2 -containing glass
- the glass compositions of the glasses are shown in the following table without refining agents:
- Figure 1 shows the phase diagram of platinum and tin. Tin forms various eutectic compositions with platinum with melting points at 1365 ° C and 1070 ° C. The inventors suspect that the formation of alloy phases of the noble metal with tin is the cause of the damage. The following table shows the results and observations in detail. Four samples from different sections of the same pipe were examined:
- FIGS. 2 to 6 the light gray areas show parts of the refining tube.
- the dark areas show the glass in contact with the refining tube.
- Figure 2 shows Sn0 2 -filled cavities (dark areas in the refining tube) and a detaching noble metal particle in a section of the refining tube that has been changed by corrosion.
- Figure 3 shows a Sn0 2 -filled cavity in the noble metal.
- FIG. 4 shows Sn0 2 -filled cavities and detached noble metal particles on a section of the refining tube that has been changed by corrosion.
- FIG. 5 shows detaching and already detached noble metal particles on a section of the refining tube that has been changed by corrosion.
- FIG. 6 shows Sn0 2 needles in a section of the refining tube that has been changed by corrosion.
- the data show that SnÜ2 participates in the formation of defects in the precious metal tube and that considerable corrosion occurs with the entry of platinum particles into the glass.
- FIGS. 7 and 8 show the appearance of platinum particles in glass containing SnC> 2.
- precious metal particles dissolve in the melt and later precipitate in the glass.
- the size of these particles is usually less than 60 ⁇ m, and they are often much smaller, for example approx. 5 ⁇ m.
- Such particles are unproblematic in certain applications. If, however, such particles occur in particular close to the surface in a thin glass, the particles are particularly noticeable since the surfaces bulge in the defect area and the defect becomes even more visible. So Defects arise that are significantly larger than the particle itself. In production, there are exclusion rates of 10-30%.
- T1 stands for the melting temperature
- T2 for the refining temperature
- t1 and t2 stand for the melting and refining time.
- the contents of SnÜ2 and CI were determined daily by means of X-ray fluorescence analysis.
- the refining agent change was completed after 5 days. During this phase and the following days, no change in the blistering could be detected. Bubbles are the key figure for a successful clearing of the glass.
- the conversion of the refining agent was thus successfully completed and further optimization steps could be taken.
- the cullet insert, the amount of refining agent and the refining temperature were varied in order to define the process window in which the best glass defect-free can be produced.
- the aluminosilicate glass could be produced in the production unit with cullet proportions of 0-50%, a refining agent content of 0.25-0.70% by weight and a refining temperature of 1550 to 1620 ° C without the number of bubbles having changed significantly.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Glass Compositions (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20781349.4A EP4038032A1 (de) | 2019-09-30 | 2020-09-25 | Glasartikel, verfahren zu deren herstellung und verwendungen |
CN202080068078.0A CN114514208B (zh) | 2019-09-30 | 2020-09-25 | 玻璃制品、用于生产玻璃制品的方法和玻璃制品的用途 |
JP2022519712A JP2022550398A (ja) | 2019-09-30 | 2020-09-25 | ガラス物品、その製造方法および使用 |
KR1020227014746A KR20220075398A (ko) | 2019-09-30 | 2020-09-25 | 유리 물품, 이의 제조 방법 및 용도 |
US17/708,219 US20220220021A1 (en) | 2019-09-30 | 2022-03-30 | Glass articles, methods for the production thereof and uses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019126332.8A DE102019126332A1 (de) | 2019-09-30 | 2019-09-30 | Glasartikel, Verfahren zu deren Herstellung und Verwendungen |
DE102019126332.8 | 2019-09-30 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17/708,219 Continuation US20220220021A1 (en) | 2019-09-30 | 2022-03-30 | Glass articles, methods for the production thereof and uses |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2021063834A1 true WO2021063834A1 (de) | 2021-04-08 |
Family
ID=72665256
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2020/076928 WO2021063834A1 (de) | 2019-09-30 | 2020-09-25 | Glasartikel, verfahren zu deren herstellung und verwendungen |
Country Status (7)
Country | Link |
---|---|
US (1) | US20220220021A1 (de) |
EP (1) | EP4038032A1 (de) |
JP (1) | JP2022550398A (de) |
KR (1) | KR20220075398A (de) |
CN (1) | CN114514208B (de) |
DE (1) | DE102019126332A1 (de) |
WO (1) | WO2021063834A1 (de) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6468933B1 (en) * | 1998-09-22 | 2002-10-22 | Nippon Electric Glass Co., Ltd. | Alkali-free glass and method of producing the same |
WO2006115997A2 (en) | 2005-04-27 | 2006-11-02 | Corning Incorporated | Method of fining glass |
EP1953122A1 (de) * | 2005-11-15 | 2008-08-06 | Isuzu Glass Co., Ltd. | Glas zur blockierung von blau-violettem licht |
WO2009108285A2 (en) | 2008-02-26 | 2009-09-03 | Corning Incorporated | Fining agents for silicate glasses |
US20090270242A1 (en) * | 2007-06-06 | 2009-10-29 | Nippon Electric Glass Co., Ltd. | Alkali-free glass and alkali-free glass substrate |
DE102011084543A1 (de) * | 2011-10-14 | 2013-04-18 | Schott Ag | Borosilicatglas mit hoher hydrolytischer Beständigkeit |
EP2650264A1 (de) * | 2010-05-31 | 2013-10-16 | Nippon Electric Glass Co., Ltd. | Auf li2o-al2o3-sio2 basierendes kristallisiertes glas und herstellungsverfahren dafür |
EP3190096A1 (de) * | 2014-09-05 | 2017-07-12 | Nippon Electric Glass Co., Ltd. | Borosilicatglas und glasrohr für medikamentenbehälter |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR9808615A (pt) * | 1997-02-03 | 2000-05-16 | Corinig Inc | Lentes fotocromáticas aperfeiçoadas |
US20050096209A1 (en) * | 2002-06-10 | 2005-05-05 | Asahi Glass Company, Limited | Glass and method for producing glass |
JP5146897B2 (ja) * | 2004-04-05 | 2013-02-20 | 日本電気硝子株式会社 | 照明用ガラス |
DE102010009585B4 (de) * | 2010-02-26 | 2012-04-19 | Schott Ag | Lithium-Aluminosilicatglas mit hohen E-Modul, Verfahren zu dessen Herstellung und Verwendung |
-
2019
- 2019-09-30 DE DE102019126332.8A patent/DE102019126332A1/de active Pending
-
2020
- 2020-09-25 WO PCT/EP2020/076928 patent/WO2021063834A1/de unknown
- 2020-09-25 JP JP2022519712A patent/JP2022550398A/ja active Pending
- 2020-09-25 EP EP20781349.4A patent/EP4038032A1/de active Pending
- 2020-09-25 KR KR1020227014746A patent/KR20220075398A/ko unknown
- 2020-09-25 CN CN202080068078.0A patent/CN114514208B/zh active Active
-
2022
- 2022-03-30 US US17/708,219 patent/US20220220021A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6468933B1 (en) * | 1998-09-22 | 2002-10-22 | Nippon Electric Glass Co., Ltd. | Alkali-free glass and method of producing the same |
WO2006115997A2 (en) | 2005-04-27 | 2006-11-02 | Corning Incorporated | Method of fining glass |
EP1953122A1 (de) * | 2005-11-15 | 2008-08-06 | Isuzu Glass Co., Ltd. | Glas zur blockierung von blau-violettem licht |
US20090270242A1 (en) * | 2007-06-06 | 2009-10-29 | Nippon Electric Glass Co., Ltd. | Alkali-free glass and alkali-free glass substrate |
WO2009108285A2 (en) | 2008-02-26 | 2009-09-03 | Corning Incorporated | Fining agents for silicate glasses |
EP2650264A1 (de) * | 2010-05-31 | 2013-10-16 | Nippon Electric Glass Co., Ltd. | Auf li2o-al2o3-sio2 basierendes kristallisiertes glas und herstellungsverfahren dafür |
DE102011084543A1 (de) * | 2011-10-14 | 2013-04-18 | Schott Ag | Borosilicatglas mit hoher hydrolytischer Beständigkeit |
EP3190096A1 (de) * | 2014-09-05 | 2017-07-12 | Nippon Electric Glass Co., Ltd. | Borosilicatglas und glasrohr für medikamentenbehälter |
Non-Patent Citations (1)
Title |
---|
MASSALSKI, TB: "Binary Alloy Phase Diagrams", vol. 2, 1910, AMERICAN SOCIETY FOR METALS |
Also Published As
Publication number | Publication date |
---|---|
EP4038032A1 (de) | 2022-08-10 |
KR20220075398A (ko) | 2022-06-08 |
US20220220021A1 (en) | 2022-07-14 |
JP2022550398A (ja) | 2022-12-01 |
CN114514208A (zh) | 2022-05-17 |
DE102019126332A1 (de) | 2021-04-01 |
CN114514208B (zh) | 2024-05-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE112006002184B4 (de) | Glaszusammensetzung | |
DE112006002185B4 (de) | Glaszusammensetzung und Verfahren zum Herstellen einer Glaszusammensetzung | |
DE2034393C3 (de) | Anwendung des Verfahrens zur Erhöhung der mechanischen Festigkeit eines Glases durch Austausch von Natriumionen gegen Kaliumionen auf ein Glas, das verkürzte Austauschzeiten ermöglicht | |
DE102004022629B4 (de) | Gefloatetes Lithium-Aluminosilikat-Flachglas mit hoher Temperaturbeständigkeit, das chemisch und thermisch vorspannbar ist und dessen Verwendung | |
DE60300706T2 (de) | Optisches Glas | |
DE112017007131T5 (de) | Lithiumhaltiges Aluminiumsilicatglas mit niedriger Ausdehnung nach chemischem Vorspannen | |
DE102014116798A1 (de) | Chemisch vorspannbares oder vorgespanntes Glas und Verfahren zu dessen Herstellung | |
DE102010031114B4 (de) | Glas mit hervorragender Resistenz gegen Oberflächenbeschädigungen und Verwendung von Erdalkaliphosphaten zur Erhöhung der Oberflächenresistenz von Glas | |
DE102013103573B4 (de) | Chemisch vorspannbares Glaselement mit hoher Kratztoleranz, und Verfahren zur Herstellung des Glaselementes | |
DE102013114225B4 (de) | Chemisch vorspannbares Glas und daraus hergestelltes Glaselement | |
EP2539289A2 (de) | Lithium-aluminosilicatglas mit hohem e-modul und verfahren zu dessen herstellung | |
DE112004000553T5 (de) | Alkalifreies Glas | |
DE102013102848B3 (de) | Hochbrechende Dünngläser, Verfahren zu deren Herstellung, Schichtverbund und Verwendung | |
DE1016908B (de) | Verfahren zum Herstellen von Glasgegenstaenden hoher mechanischer Festigkeit und danach hergestellte Glasgegenstaende | |
DE1421845B2 (de) | Verfestigter glasgegenstand mit einer das glasinnere umgebenden oberflaechen-druckspannungsschicht und verfahren zu seiner herstellung | |
EP3360852B1 (de) | Gläser mit verbesserter hydrolytischer und laugenbeständigkeit | |
DE202020107534U1 (de) | Borosilicatglasartikel | |
DE102022122843A1 (de) | Chemisch gehärtete Glasscheibe und Herstellungsverfahren für diese | |
DE112005003143T5 (de) | Glaszusammensetzung und Verfahren zum Herstellen derselben | |
WO2021063834A1 (de) | Glasartikel, verfahren zu deren herstellung und verwendungen | |
DE102019117498B4 (de) | Gläser mit verbesserter Ionenaustauschbarkeit | |
EP3590902B1 (de) | Hoch beständige und chemisch vorspannbare gläser | |
DE102011084543A1 (de) | Borosilicatglas mit hoher hydrolytischer Beständigkeit | |
WO2002098810A1 (de) | Verfahren zur unterdruckläuterung | |
DE102020108867A1 (de) | Einschmelzglas und dessen Verwendung |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 20781349 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2022519712 Country of ref document: JP Kind code of ref document: A |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 20227014746 Country of ref document: KR Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2020781349 Country of ref document: EP Effective date: 20220502 |