48 results about "Devitrification" patented technology

The invention relates to the field of glass, in particular to lithium-free alkali aluminosilicate glass as well as a preparation method and application thereof. According to the glass, SiO2, Al2O3, Na2O, K2O, MgO and ZrO2 serve as main components, the content of Li2O is lower than 100 ppm, a nitrate-sulfate-carbon powder composite clarifying agent is adopted, the number of bubbles and the content of residual sulfur are effectively reduced, and use of a toxic or ultraviolet absorption type clarifying agent is avoided. ZrO2 is obtained by calcining a zirconium-based metal-organic framework material and is good in dispersity, and the devitrification resistance is improved. During float forming, through micro-positive pressure, high-purity protective atmosphere and four-zone gradient temperature control, the tin penetration depth is controlled within 15 microns, and the surface tin content is smaller than or equal to 4 micrograms / cm < 2 >. The obtained glass has high light transmittance, high hardness and excellent chemical strengthening performance, and is suitable for the high-end fields of electronic display cover plates, vehicle-mounted screens, touch panels, photovoltaic substrates and the like.

The invention discloses an LTCC (Low Temperature Co-Fired Ceramic) material with a controllable shrinkage rate and a preparation method thereof. The material comprises microcrystalline glass A and a glass devitrification material B, wherein the glass devitrification material B is obtained by devitrifying microcrystalline glass C according to a specific temperature system. The glass ceramic A and the glass ceramic C have different softening temperatures. And accurately regulating and controlling the crystallization state of the glass crystallization material B by regulating and controlling the crystallization treatment temperature and / or crystallization treatment time of the microcrystalline glass C. The LTCC substrate prepared from the LTCC material can be co-fired with a silver conductor while ensuring sintering compactness and excellent high-frequency performance, and the sintering shrinkage rate is controllable in the range of 14%-18% on the X / Y axis.

The invention relates to the technical field of medical crystallization, and particularly discloses an indobufen single crystal and a preparation method thereof. The indobufen single crystal comprises the following characteristic peaks: 4.9 + / -0.1 degrees, 18.7 + / -0.1 degrees, 19.8 + / -0.1 degrees, 23.9 + / -0.1 degrees and 25.5 + / -0.1 degrees. The indobufen single crystal provided by the invention has high crystallinity, regular crystal appearance and excellent stability, has better product quality, can lay a core foundation for the uniformity and stability of subsequent preparations, and avoids the medication safety risk caused by unstable crystal form. The preparation method of the indobufen single crystal comprises the steps that indobufen is dissolved in a polar solvent, then the indobufen solution is added into a devitrification solution, and the specific indobufen single crystal structure is prepared by controlling the devitrification temperature, the method is easy to operate, low in cost and easy to industrially amplify, and the obtained crystal form is stable in quality and suitable for industrial production. The storage and the transportation are easy.

An alkali-free glass includes, in mol % in terms of oxides: SiO2: 63-75%; Al2O3: 10-16%; B2O3: 0-5%; MgO: 0.1-15%; CaO: 0.1-12%; SrO: 0-8%; and BaO: 0-6%. [MgO] / [CaO] is 1.5 or smaller. A value of Formula (A) is 82.5 or larger. A value of Formula (B) is 690 or larger and 800 or smaller. A value of Formula (C) is 100 or smaller. A value of Formula (D) is 20 or smaller. The alkali-free glass has a Young's modulus of 83 GPa or larger and a surface devitrification viscosity ηc of 104.2 dPa·s or higher.

The invention relates to the technical field of metallurgical coking, and provides a devitrification and CO erosion resistant zero-expansion silica brick and a preparation method thereof.The devitrification and CO erosion resistant zero-expansion silica brick is prepared from, by weight, 3-10 parts of nanoscale alpha-Al2O3, 15-35 parts of andalusite, 30-40 parts of high-purity fused mullite, 10-20 parts of superfine silica powder, 2-5 parts of silica sol binding agent and 3-5 parts of composite mineralizer. Through the synergistic effect of the design of the composite mineralizer and the stepped heat treatment process, the technical problems that the existing zero-expansion silica brick is easy to devitrify and crystallize fused quartz, poor in CO erosion resistance and lack of crystallization degree during long-term use at high temperature are solved; the thermal shock cycle index and the high-temperature breaking strength of the material can be improved, the formation of alpha-cristobalite crystallization peak is effectively inhibited, and the mass loss is reduced in a reducing atmosphere, so that the structural stability of the material is enhanced, and the service life of the material is prolonged.

An alkali-free glass includes, in mol % in terms of oxides: SiO2: 63-75%; Al2O3:10-16%; B2O3: 0-5%; MgO: 0.1-15%; CaO: 0.1-12%; SrO: 0-8%; and BaO: 0-6%. [MgO] / [CaO] is 1.5 or smaller. A value of Formula (A) is 82.5 or larger. A value of Formula (B) is 690 or larger and 800 or smaller. A value of Formula (C) is 100 or smaller. A value of Formula (D) is 20 or smaller. The alkali-free glass has a Young's modulus of 83 GPa or larger and a surface devitrification viscosity ηc of 104.2 dPa·s or higher.

Provided is a glass plate having a high average strength and a small degree of dispersion of the strength. A glass plate which contains a base glass phase and an intermediate phase, the base glass phase being an amorphous oxide that contains 50%-80% of SiO2, 0%-30% of Al2O3, and 0.1%-35% of Li2O in terms of oxide-based mol%, and the intermediate phase being an amorphous oxide that contains 50%-80% of SiO2, 5%-20% of Al2O3, and 5%-20% of Li2O in terms of oxide-based mol% and has a composition different from that of the base glass phase.

The invention discloses an aluminum oxide ceramic substrate with high cold and hot impact resistance and a preparation method thereof, and relates to the technical field of ceramic substrates. The aluminum oxide ceramic substrate is prepared from the following raw material components in parts by mass: 60 to 65 parts of aluminum oxide, 1 to 5 parts of modified glass powder and 0.05 to 0.2 part of magnesium oxide; the modified glass powder comprises magnesium oxide, silicon oxide and calcium carbonate, and 0.5-2.5 wt% of zirconium oxide is doped in the modified glass powder. According to the aluminum oxide ceramic substrate disclosed by the invention, the specific glass powder with high magnesium oxide content is adopted, so that devitrification can be reduced, and bubble defects can be reduced; meanwhile, a specific amount of zirconium oxide is doped in the glass powder, so that the sintering temperature required by the aluminum oxide substrate can be effectively reduced, the compactness of the material is increased, and the cold and hot impact resistance is improved.

The application discloses a transparent spinel glass ceramic, which comprises, in terms of molar percentage of oxides, Li2O: 3.50-6.00 mol%, Na2O: 2.00-4.00 mol%; the crystal phase of the glass ceramic contains spinel crystals and zirconium oxide crystals, and does not contain Li-containing crystals. The components of the spinel glass ceramic material are optimized, more Li ions and Na ions for chemical strengthening ion exchange are introduced into the spinel glass ceramic, the spinel glass ceramic without impurity crystal phase is obtained, the glass ceramic does not appear fogging and devitrification and the like, and excellent transmittance of the glass ceramic material is ensured. By introducing more Li ions and Na ions into the components of the spinel glass ceramic, the prepared spinel glass ceramic can be chemically strengthened, the transparent strengthened glass ceramic with high CS, DOL_0, CT_AV and CT_LD is obtained, and the strengthened glass ceramic exhibits excellent drop resistance.

A glass manufacturing apparatus is disclosed comprising a vessel configured to deliver molten glass; a conduit extending from the vessel, the conduit including a distal end having a concave heating member connected thereto; a first electrical flange connected to the conduit; and a second electrical flange connected to the concave heating member. A method of preventing devitrification of a molten glass forming material is also described.

The utility model relates to the technical field of photovoltaic cells, and discloses a low-pressure devitrification device, which comprises a flash evaporation mechanism, at least one extraction opening and at least one vacuum breaking opening are further formed in the inner wall of a closed cavity, the extraction opening is used for being connected with an external vacuumizing device, and the vacuum breaking opening is used for being connected with an external environment; the carrying table and the heating module are both located in the sealed cavity, a plurality of supporting pieces are further arranged on the upper surface of the carrying table, the upper ends of the supporting pieces are used for bearing a substrate, and the heating module is installed between the substrate and the carrying table. According to the low-pressure crystallization equipment provided by the utility model, the rapid heating technology is integrated in the flash evaporation mechanism, and temperature control can be matched in the low-pressure crystallization process, so that the two processes of low-pressure crystallization and annealing can be continuously carried out, the uncertainty in the intermediate circulation process is reduced, and the production efficiency is improved. It is ensured that annealing of the perovskite can be completed synchronously in the crystallization process, the grain size of the perovskite is increased, the defects of the perovskite are reduced, and the assembly efficiency is improved.

The invention provides high-refractive-index optical glass, a glass prefabricated part, an optical element and an optical instrument. The optical glass with the high refractive index comprises the following components in percentage by weight: 3-10% of SiO2; 10% to 20% of B2O3; 5% to 15% of ZnO; zrO2: 2%-8%; 30% to 42% of La2O3; 1%-8% of Y2O3; 0.2%-5% of WO3; 4% to 12% of TiO2; 4% to 12% of Nb2O5; 0 to 5 percent of BaO; wherein the ratio of (ZnO + BaO) to (TiO2 + ZrO2) is 0.40 to 2.00. Through reasonable component design, the optical glass obtained by the invention has the expected high refractive index, and also has relatively high hardness and relatively good devitrification resistance.

Provided in the present invention is a rare earth-doped reinforced glass-ceramic, and a preparation method and a use therefor. Raw materials rare earth-doped reinforced glass-ceramic comprise at least one of the following rare earth oxides: Ta2O5, La2O3, Y2O3, Tm2O3, or Nb2O5. In the present invention, a glass article doped with at least one rare earth oxide from among Ta2O5, La2O3, Y2O3, Tm2O3, or Nb2O5 is subjected to thermal treatment and ion exchange to produce the rare-earth doped reinforced glass-ceramic. In the rare earth-doped reinforced glass-ceramic, due to the high field strength and high accumulation effects of the rear earth element, the crystal size of the glass-ceramic is caused to low, and the crystal ratio thereof to be high, thus being able to effectively improve the mechanical performance and visible light transmittance of the glass-ceramic, and effectively controlling uniform devitrification of the glass. The invention is suitable for use in cover panels of electronic devices.

The invention provides a multiphase microcrystal glass fiber and a preparation method thereof, and the preparation method comprises the following steps: (1) placing mixed glass powder in a kiln, and sequentially melting, homogenizing and clarifying to obtain mixed glass liquid; wherein the mixed glass powder comprises SiO2 (silicon dioxide), Al2O3 (aluminum oxide), Li2O (lithium oxide), P2O5 (phosphorus pentoxide), ZrO2 (zirconium oxide), MgO (magnesium oxide), CaO (calcium oxide), TiO2 (titanium oxide), Na2O (sodium oxide), K2O (potassium oxide), BaO (barium oxide), ZnO ( (2) enabling the mixed glass liquid to flow out through a gradient heating furnace, and entering a heat preservation tank for devitrification to obtain microcrystalline glass liquid; wherein crystals in the glass ceramic liquid comprise at least one of lithium disilicate, lithium silicate, petalite or cordierite; and (3) enabling the microcrystalline glass liquid to flow out through a temperature control bushing plate, and drawing to obtain the multiphase microcrystalline glass fiber. According to the scheme, through cooperation of the components and the process, it is ensured that controllable devitrification of the glass is completed, meanwhile, good high-temperature fluidity is maintained, continuous preparation from molten glass to the multiphase microcrystalline glass fiber is successfully achieved, and the obtained glass fiber product has the high elastic modulus, the low dielectric constant and the low thermal expansion coefficient.

The invention belongs to the technical field of low-temperature co-fired ceramics, and relates to a low-dielectric high-strength high-thermal-conductivity Ca-B-Si-Al / Al2O3 glass ceramic composite material and a preparation method thereof.The preparation method comprises the steps that calcium carbonate, boric acid, silicon dioxide and aluminum oxide serve as raw materials, and Ca-B-Si-Al glass is smelted at the temperature of 1500-1600 DEG C; then mixing the Ca-B-Si-Al glass powder with strong devitrification capability with 10-50 wt% of aluminum oxide, and carrying out low-temperature sintering at 750-950 DEG C to realize full reaction, devitrification and densification; the obtained microcrystalline glass composite material has the advantages of high bending strength, low dielectric constant, low dielectric loss, high thermal conductivity, good compatibility with a silver electrode and a copper electrode, and excellent thermal stability. A new choice of a high-performance LTCC material is provided for a high-frequency communication device, and the LTCC material is suitable for high-frequency application scenes such as 5G communication and the Internet of Things.

This invention provides an optical glass, a method for preparing the same, and an optical element thereof. The optical glass comprises SiO2, B2O3, La2O3, Gd2O3, TiO2, Nb2O5, and ZrO2; and further comprises one or more of Si3N4, BN, and Li3N; and, based on the total mass of anions as 100%, O 2‑ The content is 79-99.5%, SO4 2‑ With N 3‑ The total content of the components is 0.5-21%; the refractive index of the optical glass is 2.04-2.06, and the Abbe number is 25-30. The optical glass of this invention has excellent internal quality, good transmittance, high hardness, high transition temperature, and relatively low liquidus temperature, thereby improving the devitrification resistance (Tg / Lt) and giving the glass good crystallization properties. It is an ultra-high refractive index, low dispersion optical glass that can shorten the lens length and improve image quality.

The invention discloses a device for producing colored glass by one kiln and two lines and a using method, the device comprises a melting part, a neck, a transverse passage, a cooling part, a heat storage chamber, a small furnace and a melting zone bubbling device, the melting part comprises a melting zone and a clarifying zone, the heat storage chamber is arranged at one end of the melting zone, the small furnace is arranged at the other end of the melting zone, and the melting zone bubbling device is arranged on the neck. The melting zone, the clarifying zone, the neck, the transverse passage and the cooling part are connected in sequence, and the melting zone bubbling device is arranged on one side, close to the clarifying zone, of the melting zone. Through the application of the device for producing the colored glass by one kiln and two lines and the use method, the device can be used for strengthening up-down convection of molten glass, solving the problem of uneven component mixing caused by weak convection, ensuring the color consistency of the glass, shortening the color changing time, promoting the discharge of impurities in the molten glass and improving the production efficiency of the colored glass. The clarification and homogenization quality of the colored glass is improved, and the phenomenon of devitrification and devitrification of the colored glass is prevented; in addition, the device can also prevent the forming effect of the colored glass from being influenced by overlarge temperature drop.

This invention provides a lanthanum flint optical glass comprising the following components in molar percentage of cations: Si 4+ 20-40%; B 3+ : 0-25%; La 3+ 0-5%; Zn 2+ 0-10%; Zr 4+ 0-5%; Ti 4+ 6-16%; Nb 5+ 0-3%; Ba 2+ : 0-18%; Sr 2+ : 0-10%; Na + 5-20%; Sb 3+ The lanthanum flint optical glass has a refractive index of 1.710-1.783 and an Abbe number of 32.0-38.2. The lanthanum flint optical glass of this invention has low transition temperature and relaxation temperature, a small coefficient of linear expansion, low density, high hardness, suitable abrasion resistance, low tinting strength, and excellent devitrification resistance, chemical stability, and mechanical properties, making it easy to mass-produce.

The invention belongs to the related technical field of laser processing, and discloses a method and a device for realizing directional high-yield devitrification in glass, and the method comprises the following steps: applying femtosecond laser pulse to the interior of the glass, modifying agent ions and forming agent ions in the glass are directionally migrated, and an ion component gradient distribution area is formed due to different migration speeds; controlling the femtosecond laser pulse to enable the path of the ion component gradient distribution area in the preset direction to be shortest or enable the ion concentration difference of the boundary of the ion component gradient distribution area in the preset direction to be maximum; and carrying out heat treatment on the glass, so that the ions in gradient distribution are further diffused, the ion diffusion flux in the preset direction is maximum, and in a laser irradiation area, the ions in the glass tend to nucleate and grow in the preset direction to form a nanocrystal structure with consistent orientation. According to the treatment, the precipitation position and the growth direction of the nanocrystals can be accurately controlled while the precipitation yield of the crystals is ensured.

To provide alkali-free glass with low dielectric loss tangent in the high-frequency range, low surface devitrification temperature, and excellent acid resistance and phase separation characteristics. [Solution] Alkali-free glass containing SiO2 50-78%, Al2O3 2-6%, B2O3 18-35%, MgO 1-6%, CaO 0-6%, SrO 0-6%, and BaO 0-3% in molar percentage based on oxides, where formula (A) is [MgO]+[CaO]+[SrO]+[BaO], and the value of formula (A) is 2% or more and 6% or less, and formula (B) is [Al2O3]-([MgO]+[CaO]+[SrO]+[BaO]), and the value of formula (B) is -3% or more and 2% or less.

The invention discloses an efficient and high-value utilization method for waste quartz crucibles, and belongs to the technical field of efficient utilization of secondary resources and preparation of high-value spherical silica powder. The method comprises the following steps: by taking the waste quartz crucible as a raw material, respectively carrying out coarse crushing to 20-50mm, intermediate crushing to 5-15mm and fine grinding to less than 3mm by adopting a closed-loop crushing and grinding process, and then carrying out acid pickling and impurity removal, superfine grinding and grading and high-temperature spheroidizing to obtain the submicron spherical silica powder with the purity of more than 4N grade, the waste quartz crucible has a composite structure of a brittle devitrification layer and a tough body. According to the method, on the basis of physicochemical properties of the waste quartz crucible, through full-process cooperative regulation and control, the advantages of low energy consumption in the crushing and fine grinding process, less impurity introduction, mild conditions in the pickling and impurity removal process, less pollution, fine granularity in the ultrafine grinding and grading process, narrow interval, high feeding speed in the spheroidizing process, high spheroidizing rate and the like are achieved.

The invention provides optical glass, a preparation method thereof and an optical element. The optical glass comprises the following components in percentage by mole of oxides: 42-55.5% of SiO2; 12 to 20 percent of TiO2; 5 to 15 percent of Na2O; 0.5 to 5 percent of K2O; 6 to 14 percent of CaO; 2 to 8 percent of SrO; 2 to 10.5 percent of Li2O; 0 to 5 percent of Al2O3; 0 to 5 percent of MgO; 0 to 5 percent of Y2O3; the refractive index of the optical glass ranges from 1.62 to 1.72, and the abbe number of the optical glass ranges from 30 to 38. The optical glass provided by the invention has the characteristics of low transformation temperature, excellent devitrification resistance, chemical stability and weather resistance and small specific gravity. Therefore, the optical glass provided by the invention is easy to produce by precise mould pressing, has excellent chemical stability, and can meet the requirements of modern novel photoelectric products.

1. A method for making a multi-core optical fiber preform, the method comprising: bonding a preform assembly to form a multi-core optical fiber preform; the preform assembly comprising a plurality of core canes, each core cane disposed within an axial bore of a sleeve; each core cane comprising a core section of alkali-doped silica glass, the silica glass having a maximum alkali concentration of about 0.10% to about 10% by weight; the core section of each core cane being surrounded by a sleeve along the height of the core cane and by covers disposed on first and second axial ends of the core section, the covers comprising silica glass having a chlorine concentration of about 0.05% or less by weight.

The present invention relates to the technical field of electronic glass, and specifically relates to an alkali-free boroaluminosilicate glass having good thermal stability and a high crystallization margin, and a preparation method therefor. The alkali-free boroaluminosilicate glass having good thermal stability and a high crystallization margin comprises, in mole percent, the following raw materials: 68.54%–72.82% SiO2, 11.84%–13.5% Al2O3, ≤ 2.23% B2O3, 4.72%–6.6% MgO, 4.65%–5.8% CaO, 0.8%–1.5% SrO, 3.2%–3.79% BaO, and 0.1% SnO2, where SiO2 + Al2O3 is 81.63%–84.66%, and (MgO + CaO + SrO + BaO) / Al2O3 is 1.15-1.30. The alkali-free boroaluminosilicate glass obtained in the present application has a high strain point and a high crystallization margin, and achieves both high thermal stability and high devitrification resistance.

To provide a glass that can suppress the deformation of a glass substrate, is excellent in moldability, and has a low burden on manufacturing equipment.SOLUTION: Provided is an alkali-free glass in which thermal expansion coefficient, Young's modulus, strain point, temperature T4 at which viscosity is 104 dPa s, glass surface devitrification temperature, and temperature T2 at which viscosity is 102 dPa s are within specified range, and contained amount of SiO2, Al2O3, B2O3, MgO, CaO, SrO, and BaO, MgO+CaO+SrO+BaO, and MgO / CaO are within specified range.SELECTED DRAWING: None

An object of the present application is to provide a glass which can suppress deformation of a glass substrate, is excellent in moldability, and has a low burden on manufacturing equipment. The alkali-free glass of the present application has a coefficient of thermal expansion, a Young's modulus, a strain point, a viscosity of 10 4 dPa s at a temperature T4, a glass surface devitrification temperature, and a viscosity of 10 2 dPa s at a temperature T2 within a prescribed range, and a content of SiO2, Al2O3, B2O3, MgO, CaO, SrO, and BaO, MgO+CaO+SrO+BaO, and MgO / CaO within prescribed ranges.

An object of the present invention is to provide a glass capable of suppressing deformation such as warpage of a glass substrate, having excellent formability, imposing a low burden on production equipment, and facilitating production of a large and thin glass substrate.SOLUTION: The glass of the present invention has a density, a Young's modulus, a strain point, a temperature T4 at which the glass viscosity becomes 104 dPa·s, a glass surface devitrification temperature (Tc), and a thermal expansion coefficient within predetermined ranges, and the contents of at least one alkali metal oxide selected from the group consisting of SiO2, Al2O3, Li2O, Na2O, and K2O, and P2O5 are within predetermined ranges.SELECTED DRAWING: None

Provided is a glass for coating a semiconductor element, which has little environmental burden and is not susceptible to devitrification in a melting step. This glass for coating a semiconductor element is characterized by containing, in mol%, 40 to 75% of (SiO2 + ZnO), 0 to 20% of B2O3, 5 to 15% of Al2O3, and 8 to 22% of (MgO + CaO) as a glass composition, with Al2O3 / (SiO2 + ZnO) in a molar ratio of 0.2 or less, and containing substantially no lead component.

Manufacturing can be facilitated while deflection is suppressed. A glass (10) has a Young's modulus of 95 GPa or more, a coefficient of linear thermal expansion of 5.5 ppm / ° C. or less, and a devitrification suppression parameter value represented by Formula (1) of 6.0 or more.

The present invention relates to a glass which can be easily manufactured while suppressing deflection, and which has a Young's modulus of 95 GPa or more, a coefficient of linear thermal expansion of 5.5 ppm / DEG C or less, and a devitrification suppression parameter value (A) represented by formula (1) of 6.0 or more. In formula (1), N is the number of oxides contained in an amount of 0.5% or more of the oxides contained in the glass when expressed by mol% on the basis of oxides, R is a gas constant, and [RxOy] is the content of an oxide RxOy contained in the glass when expressed by mol% on the basis of oxides.