34 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 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.

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.

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.

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.

Disclosed in the present invention is a multi-crystal nucleus transparent glass-ceramic and a preparation method therefor, said preparation method comprising the following steps: during glass production, adding a plurality of types of nucleation agents, and after processing, acquiring a mother glass having certain outer dimensions; and placing the mother glass obtained in S2 under a temperature of T1 and heating for 1h-6h to perform annealing treatment, after the annealing treatment is complete, placing under a temperature of T2 and heating 1h-6h to perform nucleation treatment, and after nucleation treatment is complete, placing under a temperature of T3 and heating 0-3h to perform crystallization treatment. T1<T2. The present invention produces a glass-ceramic containing multiple types of crystal nuclei and having crystal phases of lithium disilicate and petalite. The multiple crystal nuclei reduces the nucleation and crystallization energies required for devitrification, thus being able to reduce thermal treatment temperature and time, and adjust the ratio of crystals. The glass-ceramic prepared by means of the present preparation method features an increased damage resistance, good fracture toughness, and a broad application range.

To provide an inexpensive optical glass having a low specific gravity to a refractive index and high devitrification resistance in spite of being a high refractive index (nd) glass.SOLUTION: In which SiO2, B2O3, La2O3, and TiO2 are essential components, in mass% on an oxides basis, SiO2 components are more than 0% and 15.0% or less, B2O3 components are more than 0% and 15.0% or less, La2O3 components are 20.0 to 40.0%, TiO2 components are 20.0 to 40.0%, and the sum of the contents of RO components (in the formula, R is one or more selected from the group consisting of Mg, Ca, Sr, Ba, and Zn) is more than 0% and 18.0% or less.SELECTED DRAWING: Figure 1

We provide technology to suppress devitrification of molten glass. [Solution] The manufacturing method involves, before performing the repair, upstream of the location where the pre-repair will be performed, using a viscosity of 1.0 × 10 4 The method involves lowering the temperature of the molten glass from a temperature higher than the temperature corresponding to dPa·s to a temperature lower than that. The manufacturing method also involves changing the molten glass held in the melting furnace from a first glass to a second glass before lowering the temperature of the molten glass. The first glass has a viscosity of 1.0 × 10⁻⁶ 4 dPa·s ~1.0 × 10 7 The maximum crystal growth rate in the temperature range corresponding to dPa·s is 50 μm / hr or more. The second glass has a viscosity of 1.0 × 10 4 dPa·s ~1.0 × 10 7 The maximum crystal growth rate in the temperature range corresponding to dPa·s is 40 μm / hr or less.

An alkali-free glass includes, in mol % in terms of oxides: SiO2: 63-75%; Al2O3: 10-16%; B2O3: larger than 0.5% and 5% or smaller; MgO: 0.1-15%; CaO: 0.1-12%; SrO: 0-8%; and BaO: 0-6%. [MgO] / [CaO] is larger than 1.5. 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.

To provide an optical glass having a high refractive index, low dispersibility and devitrification resistance at a high level and capable of stably producing a large-sized glass gob.SOLUTION: A Si4 + content of 5% or more and 20% or less, a B3 + content of 0% or more and 5% or less, a Al3 + content of 18% or more and 35% or less, a total content of La3 +, Y3 +, and Gd3 + of 15% or more and 50% or less, a Zr4 + content of 2% or more and 15% or less, a Ta5 + content of 8% or more and 30% or less, and a Gd3 + content of 0% or more and 10% or less, in terms of mol% of cations.SELECTED DRAWING: Figure 1

The invention discloses a clean skin substrate preparation method based on throttling expansion induced cooling devitrification multiphase jet flow, and belongs to the technical field of aviation maintenance. The method comprises: firstly planning a nozzle scanning path; then the mechanical arm and the nozzle assembly are adjusted to initial positions; thirdly, compressed gas is introduced into the self-rotating nozzle assembly, the saturated salt solution is sucked in, the compressed gas is throttled and expanded through a Laval nozzle to generate low temperature, the salt solution is induced to be cooled, crystals are separated out, and gas-liquid-crystal three-phase jet flow is formed; and finally, the spray head is driven to move along the track, and the three-phase jet flow is used for cleaning the outer side coaming, the front edge lip and the silencing plate of the aircraft air inlet channel. According to the method, the crystals separated out in situ by cooling are used as the abrasive medium, no residue exists after cleaning, the problems of abrasive embedding, thermal damage and chemical damage in a traditional method are thoroughly avoided, the clean skin base body can be efficiently and controllably prepared, and an innovative solution is provided for maintenance and preparation of the clean skin base body of the aircraft air inlet channel.

Provided is an optical glass having excellent light transmittance characteristics and devitrification resistance in the visible region, and having high refractive index characteristics. The optical glass provided by the invention is characterized by comprising the following components in percentage by mass: 3 to 18 percent of SiO2, 5 to 11.5 percent of B2O3, 0 to 7 percent of Al2O3, 0 to 11 percent of CaO, less than 1 percent of ZnO, 7 to 20 percent of TiO2, 3 to 38 percent of Nb2O5, 27 to 49.8 percent of La2O3, 6 to 14 percent of Gd2O3, 0 to 5 percent of Y2O3, less than 6 percent of Ta2O5 and less than 0.6 percent of WO3, and the ratio of B2O3 to SiO2 is 1 to 2 in percentage by mass.

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

The present invention provides: a halide glass which does not undergo devitrification even if a rare earth element is introduced; an optical element; and an optical device.　The halide glass contains, in terms of cation%, 11-60% of Al, 0.1-20% of Sc, a total of 10-88.7% of Mg, Ca, Sr, and Ba, and 0.01-20% of Ln (Ln is at least one selected from among Cr, Ce, Nd, Yb, Er, Pr, Sm, Eu, Tb, Dy, Ho, and Tm), while containing 70-100% of F in terms of anion%.