612 results about "Devitrification" patented technology

An object of the invention is to obtain a glass substrate having high mechanical strength by reconciling suitability for ion exchange and devitrification proof in a glass. The strengthened glass substrate of the invention is a strengthened glass substrate having a compression stress layer in the surface thereof, the glass substrate having a glass composition including, in terms of % by mass, 40-70% of SiO₂, 12-25% of Al₂O₃, 0-10% of B₂O₃, 0-8% of Li₂O, 6-15% of Na₂O, 0-10% of K₂O, 13-20% of Li₂O+Na₂O+K₂O, 0-3.9% of MgO, 0-5% of CaO, 0-5% of ZnO, 0-6% of ZrO₂, and 0-5% of SrO+BaO, the value of (MgO+ZrO₂+ZnO)/(MgO+ZrO₂+ZnO+Al₂O₃) in terms of mass proportion being from 0.25 to 0.45. The above-mentioned strengthened glass can be produced by melting raw glass materials mixed together so as to result in the given glass composition, forming the melt into a sheet by an overflow downdraw process, and then conducting an ion exchange treatment to form a compression stress layer in the glass sheet surface.

The optical filter of the present invention is provided with a near infrared light absorption layer that contains a component composed of copper ions and a phosphoric ester compound expressed by the following Formula (10), in which the phosphorus atom content in the near infrared light absorption layer is 0.4 to 1.3 mol per mole of copper ions, and the copper ion content in the near infrared light absorption layer is 2 to 60 wt %. Thus keeping the phosphorus atom and copper ion content within specific ranges results in good near infrared light absorption and in improved moisture resistance whereby devitrification caused by whitening is suppressed

A number of unique processes are disclosed for manufacture of sintered high-purity quartz glass products in which a shaped silica body or preform is made from an aqueous slurry of micronized silica particles by gel casting, slip casting or electrophoretic deposition. The silica particles may comprise a major portion by weight of crystalline silica. In one embodiment of the invention the sintered quartz glass is transparent, substantially bubble-free and suitable for scientific or optical uses. In another embodiment the porous silica preform is fired in steam to increase the hydroxyl content and then nitrided in a nitrogen-hydrogen reducing atmosphere. A minute amount of chemically-combined nitrogen in the high-purity quartz glass is sufficient to provide a tremendous improvement in physical properties and an incredible increase in the resistance to devitrification.

The objective of the invention is to obtain a glass substrate satisfying ion exchange performance and devitrification resistance of a glass simultaneously and having higher mechanical strength compared to a conventional glass substrate. The tempered glass substrate which has a compression stress layer on a surface thereof, comprises a glass composition including, in terms of mole%, 50-85% of SiO2 , 5- 30% of Al2O3, 0-20% of Li2O, 0-20% of Na2O, 0-20% of K2O, 0.001-10% of TiO2, and 15-35% of Li2O+Na2O+K2O+Al2O3. The tempered glass substrate has a (Li2O+Na2O+K2O)/Al2O3 value of 0.7-3 in terms of mole fraction, and is substantially free of As2O3 and F.3 in terms of mole fraction, and is substantially free of As2O3 and F.

The present invention relates to development of bioactive glass/glass-ceramic composition that are able to promote a fast deposition layer of carbonated hydroxyapatite upon immersion in simulated body fluid (SBF) for time periods as short as one hour. Such composition might include fluorides, and a variety of oxides (or their precursor compounds), such as Na₂O—Ag₂O—SrO—CaO—MgO—ZnO—P₂O₅—SiO₂—Bi₂O₃—B₂O₃—CaF₂, be prepared by the melt route or by the sol-gel process, with the specific composition and the preparation route selected according to the intended functionalities, which can present controlled biodegradation rate and bactericidal activity. The powders derived from glass melts purred in cold water (frits) may completely densify by sintering at temperatures up to 800° C. without devitrification, resulting in bioglass compacts with high flexural strength (˜85 MPa). The bioactive glass powders prepared by sol-gel densify at lower temperatures due to their higher specific surface area and reactivity.

The invention discloses a synthetic method of thiophene-3-ethanol. The method comprises the following steps of: adding a halogenated hydrocarbon solvent and ethylene glycol into a reaction kettle, dropwise adding thionyl chloride and preserving heat for reacting; separating liquid and extracting to obtain an organic phase containing a substance shown in the specifications; adding a ruthenium trichloride aqueous solution and a sodium bicarbonate aqueous solution in the presence of the halogenated hydrocarbon solvent and dropwise adding a sodium hypochlorite aqueous solution; after detecting that a system does not have oxidizing property, performing liquid separation, concentration, devitrification and drying to obtain a substance shown in the specifications, adding an ester solvent and butyl lithium into a reaction kettle, adding a prepared ester solution of tribromothiofuran and a prepared ester solution of the substance, separating the liquid and extracting to obtain a system containing a substance shown in the specifications; and adding a dilute sulfuric acid into the system containing the substance shown in the specifications, concentrating, neutralizing, extracting and concentrating to obtain an end product. The method has the advantages of high reaction purity and yield, stable process condition, easiness for operation and mass production capability; and the thiophene-3-ethanol is prepared from tribromothiofuran by performing low-temperature lithiation, so that the use of epoxy ethane serving as an explosive hazard is avoided, and mass production becomes possible.

Disclosed is a glass flake (10) having improved heat resistance and improved chemical durability, which is composed of a glass base material satisfying, as expressed in mass %, 60≦SiO₂≦70, 5≦Al₂O₃≦15, 1≦MgO≦10, 10≦CaO≦25 and 4<(Li₂O+Na₂O+K₂O)<9. The temperature difference ΔT obtained by taking the devitrification temperature of the glass base material from the working temperature thereof is preferably within the range of 0-200° C. The glass transition temperature of the glass base material is preferably within the range of 560-750° C. It is desirable that the value of ΔW, which serves as an index for the acid resistance of the glass base material, is within the range of 0.05-1.2 mass %.

The invention provides environmental-friendly dense-lanthanum optical flint glass, comprising the following compositions in percentage by weight: 1 to 9 percent of SiO2, 15 to 30 percent of B2O3, 10 to 25 percent of La2O3, 10 to 30 percent of Nb2O5, 0 to 3 percent of Li2O, 0 to 6 percent of Na2O, 0 to 3 percent of K2O, 0 to 3 percent of MgO, 0 to 8 percent of CaO, 0 to 3 percent of SrO, 5 to 25 percent of BaO, 0 to 15 percent of TiO2, 0 to 10 percent of ZrO2, 0 to 3 percent of GeO2, 0 to 3 percent of WO3, 0 to 3 percent of P2O5, 0 to 3 percent of Gd2O3, 0 to 3 percent of Ta2O5, and 0 to 1 percent of Sb2O3. The optical flint glass has a refractive index between 1.81 and 1.90, an Abbe number between 25 and 33, and no PbO and As2O3, and has perfect optical property and excellent devitrification resistance.

Phosphate optical glass having an Abbé number, νd, of greater than 59. A preform for precision press molding being comprised of the phosphate optical glass. An optical glass being comprised of the phosphate optical glass and manufacturing method of the same. Provided are low-dispersion phosphate optical glass having a low-temperature softening property and good weatherability, suited to precision press molding, and further having good devitrification stability, a preform for precision press molding comprised of the above glass and a method of manufacturing of the same, a glass optical element having the above optical characteristics as well as good weatherability and a method of manufacturing the same.

The invention relates to a glass substrate for display device and a method for manufacturing same and provides a glass substrate which is high in strain point and capable of preventing a melting tank from melting loss, a glass substrate which is high in strain point and capable of suppressing devitrification, a glass substrate which is high in strain point and etching speed, and a method for manufacturing the glass substrate. The glass substrate contains Sio2 and Al2O3, 0-8% of B2O3, 0.01-0.8 % of R2O, and 0.05-1 of BaO/RO in mol%, and the strain point is over 670 DEG C. The glass substrate may contain Sio2, Al2O3 and MgO, 0.1-0.9 of MgO/(RO+ZnO), the strain point is over 700 DEG C, and the contraction rate is 5ppm-75ppm. The glass substrate may contain Sio2, Al2O3 and BaO, 0-7% of B2O3, 1-15% of BaO, and less than 6.0 of Sio2/Al2O3, and the strain point is over 700 DEG C. RO represents (MgO+CaO+SrO+BaO), and R2O represents (Li2O+Na2O+K2O).

Preforms for precision press molding made of optical glass, optical elements, and methods of manufacturing the same are provided. The preforms are suited to precision press molding having a broad range of dispersion characteristics, a low glass transition temperature, a low sag point, and good resistance to devitrification while containing no PbO. The optical element is obtained by precision press molding the preform. One example of the preform has a refractive index (nd) of greater than or equal to 1.7 and an Abbé number (vd) of less than or equal to 32. The other example of the preform has an Abbé number (vd) exceeding 32.

Provided is a glass composition suitable for a glass substrate for a flat panel display such as a liquid crystal display. This glass composition has high thermal stability, and is substantially free of BaO but has a low devitrification temperature. It is suitable for the production of a glass substrate by a downdraw process. This glass composition contains, in terms of mass %; 54 to 62% of SiO₂; 4 to 11% of B₂O₃; 15 to 20% of Al₂O₃; 2 to 5% of MgO; 0 to 7% of CaO; 0 to 13.5% of SrO; 0 to 1% of K₂O; 0 to 1% of SnO₂; and 0 to 0.2% of Fe₂O₃, and is substantially free of BaO. In this glass composition, the total content of alkaline earth metal oxides (MgO+CaO+SrO) is 10 to 18.5 mass %. The devitrification temperature of the glass composition is 1200° C. or lower.

The invention provides optical glass which is applicable to low-cost precision molding aspheric lens, the components of which by weight percentage are 7-32 percent of SiO2, 13-40 percent of B2O3, 10-35 percent of La2O3, 1-8 percent of Y2O3, 5-25 percent of CaO, 3.5-9 percent of Li2O, 1-7 percent of ZrO2 and 0.002-0.05 percent of Sb2O3. The functional effect of the invention is that: Nd is from 1.63 to 1.695; Vd is from 52 to 58; molding temperature is lower than 600 DEG C; tinctorial strength is good; specific gravity is less than 3.50g/cm<3>; chemical stability is excellent; liquidus temperature is low, that is, anti-devitrification of the glass is good; in addition, the invention does not comprise the components of Pb, F, etc. which is harmful to environment and moulds, and is very suitable for precision optical elements with low cost and large volumes, such as molding aspheric lens, spherical lens, etc.

The invention discloses ingredients, manufacturing techniques and technological parameters of a novel microcrystal glass ceramic composite board. The novel microcrystal glass ceramic composite board is characterized in that the ingredients contain no zinc oxide. The ingredients comprise 50-65% of SiO2, 5-20% of Al2O3, 5-20% of CaO, 5-20% of MgO, 2-8% of K2O+Na2O, 0-1% Li2O, 2-8% of NaO, 3-8% B2O3 and balanced 5-20% of clarifying agent, nucleation agent and coloring agent. A pyroxene microcrystal phase is separated out from glass ceramics, the devitrification breaks through particle boundaries, and crystallization textures in various patterns are grown. The novel microcrystal glass ceramic composite board achieves purposes of low cost and high decorative art levels.

The invention discloses a base plate glass with rare-earth element to dope liquid crystal display device (TFT-LCD), which is characterized by the following: comprising glass basic oxide, lanthanum oxide, cerium oxide, neodymium oxide and or yttrium oxide; setting the mass ratio at (60. 5-195):(0. 003-28) of the glass basic oxide and all rare-earth oxide; adding at least three rare-earth oxide; improving the fusion of the glass; accelerating clarification and equalization in the course of formation; preventing glass crystallizer; decreasing the liquid phase temperature; delaying devitrification speed of the glass; fitting for productive technology of float glass; improving chemical stability of the glass; decreasing the expansion coefficient; fitting for large scale float glass procession.

The present invention provides an optical glass which refractivity (nd) and Abbe number (vd) are all located in an expectation range, has less veins and is difficult to bring devitrification, and can be used to form a great-diameter preforming material, a preforming material using the optical glass and an optical element. The optical glass, relative to a gross mass of the glass scaled based on oxide by weight percentage, contains 5.0-35.0% of B2O3, 15.0-50.0% of La2O3, less than 10.0% of Rn2O (Rn is selected from more than one of Li, Na, K) AND 1.0-15.0% of WO3.

The invention provides a dense lanthanum flint glass with a refractive index of 1.82-1.87 and an abbe number of 30-35. The glass has no apparent devitrification under the temperature of Tg+230 DEG C for over 30 minutes. The glass comprises, by mole percentage, LnO2(The LnO2 is one or more of SiO2, TiO2, ZrO2, Geo2 and CeO2), M2O3(The M2O3 is one or more of B2O3, La2O3, Y2O3, Yb2O3, Gd2O3, Ga2O3, Bi2O3, Al2O3 and Sb2O3), D2O5(The D2O5 is one or several substances of Nb2O5, Ta2O5 and P2O5) and RO. With a reasonable formula ratio design and on the precondition of guaranteeing the foreseeable optical property and performance, the flint glass is suitable for the production of high numerical aperture optical fibers and the glass elements which need heat treatment many times.

Glass has optical constants of a refractive index (nd) of 1.79 or over and an Abbe number (νd) of 27 or over and a specific gravity (D) of 3.20 or over and is free from devitrification in the interior of the glass in a reheat test. The glass has chemical durability according to the Powder Method (acid-proof property RA according to the Powder Method) which is Class 1.

The invention relates to optical glass, a prefabticated member thereof, an optical element and an optical instrument, and provides the optical glass which is prepared from the following components inpercentage by weight: 0 to 10% of SiO2, 5 to 25% of B2O3, 0 to 15% of ZrO2, 10 to 25% of ZnO, 2 to 30% of TiO2 plus Nb2O5 plus WO3 and 30 to 55% of Ln2O3. The content of the Ln2O3 is total content ofLa2O3, Gd2O3, Y2O3 and Yb2O3, wherein a ratio of B2O3 to Ln20O3 is 0.3 to 0.8, and a ratio of Y2O3 to Gd2O3 is 0.3 to 3. The optical glass has a refractive index (nd) of 1.84 to 1.87 and an abbe number (vd) of 38 to 41, and meanwhile, is excellent in devitrification resistance and crystallization resistance and high in chemical stability.