90 results about "Devitrification" patented technology

The utility model relates to the technical field of melting furnaces, in particular to a furnace bottom structure for an infrared optical glass melting furnace, which comprises a supporting plate part, a first heat insulation round brick, a furnace bottom supporting plate and a second heat insulation round brick, the first heat insulation layer is arranged between the first heat insulation round bricks and the bottom plate; the crucible fixing part comprises a second heat-insulating round brick nested on one side, deviating from the bottom plate, of the first heat-insulating round brick, a crucible support nested on one side, deviating from the bottom plate, of the second heat-insulating round brick, and a crucible claw group arranged on one side, deviating from the bottom plate, of the crucible support; and the eccentric opening penetrates through the crucible fixing part and the supporting plate part and is deviated from the center line of the furnace bottom structure. According to the utility model, the eccentric opening is formed in the furnace bottom structure, so that the straight channel pouring design of the vertical furnace is realized, the performance of a poured plastic solution is uniform and controllable, devitrification is not generated, and the yield of products is improved.

The utility model discloses a crystallization device for producing O-methyl-N-methyl-N-nitroisourea, and relates to chemical equipment. A devitrification device for producing O-methyl-N-methyl-N-nitroisourea comprises a devitrification barrel, a main body of the devitrification barrel is of a barrel-shaped structure with a one-way opening in the top end, a bottom plate is fixedly connected to the bottom end face of the devitrification barrel, a main body of the bottom plate is of a rectangular structure, through holes are formed in the bottom plate, the through holes are installing holes, the number of the installing holes is four, and the installing holes are communicated with the bottom plate. The four mounting holes are formed in the four corners of the interior of the bottom plate correspondingly, a temperature detector is fixedly connected to the interior of the crystallization barrel, and a main body of the temperature detector is an industrial temperature sensor. According to the utility model, the purpose of quickly and stably taking out the crystallized substance can be realized, the labor intensity can be reduced, and the crystallization efficiency can be improved.

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 present invention provides an optical glass comprising, by weight, 1-12% SiO2, 5-18% B2O3, 40-60% La2O3, 4-20% Y2O3, 1-12% ZrO2, 4-20% Nb2O5, and 4-18% TiO2. Through rational component design, the present invention can produce optical glass with excellent devitrification resistance at a low raw material cost.

The invention relates to the technical field of electronic glass, in particular to heat-resistant stable alkali-free boroaluminosilicate glass with high crystallization margin and a preparation method of the alkali-free boroaluminosilicate glass. The alkali-free boroaluminosilicate glass with heat resistance, stability and high crystallization margin is prepared from the following raw materials in percentage by mole: 68.54 to 72.82 percent of SiO2, 11.84 to 13.5 percent of Al2O3, less than or equal to 2.23 percent of B2O3, 4.72 to 6.6 percent of MgO, 4.65 to 5.8 percent of CaO, 0.8 to 1.5 percent of SrO, 3.2 to 3.79 percent of BaO and 0.1 percent of SnO2, the ratio of SiO2 to Al2O3 is 81.63 to 84.66 percent, and the ratio of (MgO + CaO + SrO + BaO) to Al2O3 is 1.15 to 1.30. The alkali-free boroaluminosilicate glass obtained in the invention has a high strain point and crystallization margin, and also has high heat-resistant stability and devitrification resistance.

The present invention discloses a perovskite quantum dot glass with enhanced luminescence capability, a preparation method thereof, and an application thereof, and belongs to the field of perovskite quantum dot glass display technology. The present invention regulates the network structure of borosilicate glass by adding ZrO2, so that the perovskite quantum precursor glass gradually changes from self-crystallization to transparency and finally to devitrification, the network structure of the glass matrix is ​​ordered, the surface defects at the interface between the perovskite quantum dots and the glass matrix are passivated, and the radiation recombination probability is increased, thereby obtaining a perovskite quantum dot glass with significantly improved photoluminescence performance. The perovskite quantum dot glass has a green light emission wavelength of 527nm, a full width at half maximum (FWHM) of 25.8nm, an internal quantum dot efficiency of 93.1%, and a brightness of 375cd / m ‑2 The maximum green light brightness under the excitation of the blue light (450nm) plate can reach 2647cd / m ‑2 When this perovskite quantum dot glass is used as an LED backlight module in LCD display, it can achieve a color gamut area of ​​118% of the NTSC standard, which is 1.73 times the color gamut of commercial displays, achieving a wide color gamut display effect.

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 glass for a liquid flash capillary array as well as a preparation method and application of the glass. The glass comprises the following components by mole percent: 80-85% of SiO2; 0.5% to 4% of Al2O3; 4.5 to 8% of B2O3; the sum of the contents of K2O and Na2O is 2-8%; the sum of the PbO content and the CdO content is 1-2%; 1.5%-4% of ZrO2; the sum of the contents of the KFH2 and the K2SiF6 is 1 to 4 percent; 0.2% to 0.5% of BaF2; and 0.5%-1% of CeO2. The technical problem to be solved is how to provide glass with low refractive index, high softening point, good devitrification resistance, good pressure resistance and radiation resistance, so that the glass can be used for preparing the liquid flash capillary tube array.

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.

To provide a glass which enables suppression of deformation such as warpage of a glass substrate, is excellent in moldability, is low in a burden on a manufacturing facility, is low in a crystal growth rate, and is further excellent in productivity and quality.SOLUTION: An alkali-free glass contains 50 to 80% SiO2, 8 to 20% Al2O3, 0.1% or more B2O3, 1% or more SrO, 1% or more BaO, 0 to 0.2% Li2O+Na2O+K2O, and 0 to 1% P2O5, wherein [MgO] / [CaO] is 1.5 or less, a value of Formula (B) is 710 to 800, a value of Formula (E) is 3.00 to 5.50. The alkali-free glass has a Young's modulus of 83 GPa or more, a strain point of 690°C or higher, T4 of 1,400°C or lower, T2 of 1,800°C or lower, an internal devitrification temperature of 1,320°C or lower, a ηd of 104.4dPa s or more, a ηc of 104.2dPa s or more, a crystal growth rate of 100 μm / hr or less, a density of 2.8 g / cm3 or less, and an average thermal expansion coefficient of 30×10-7 / °C to 45×10-7 / °C.SELECTED DRAWING: None

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.

The invention discloses an ammonium nitrate solution devitrification point testing device and method.The device comprises a water bath box and a sample cup, a supporting assembly is arranged at one end of the water bath box, a testing assembly is arranged in the supporting assembly, the supporting assembly comprises a clamping ring, and the outer wall of the bottom of the water bath box is fixedly sleeved with the clamping ring; and the outer wall of the water bath box is movably sleeved with an annular rotating plate. The temperature sensed by the infrared temperature sensing probe and the conductivity sensed by the detection electrode are displayed through the digital display, the conductivity suddenly changes along with gradual reduction of the temperature when the temperature reaches the crystallization point temperature, the system automatically records and stores the temperature at the moment, namely the temperature of the crystallization point of the ammonium nitrate solution, and if the temperature difference between the environment temperature and the solution temperature is small, the temperature is not changed. The temperature of the solution is slowly reduced, warm water can be input into the water bath box, the temperature in the sample cup is changed by controlling the cooling speed of the warm water in the water bath box, the temperature is controlled to be slowly reduced, and the data of the crystallization point of the ammonium nitrate solution is accurately detected.

To provide a glass plate for an information recording medium.SOLUTION: The glass plate for an information recording medium according to the present invention has a Young's modulus of at least 94 GPa, a specific gravity of 2.8 at a maximum, and a glass transit temperature of at least 700°C. The glass plate for an information recording medium includes a glass composition containing MgO in a concentration of 15-30 mol%. ΔT, which is a temperature obtained by subtracting a devitrification temperature from a liquid phase temperature (T2), is at least 20°C, the specific modulus is at least 36 MNm / kg, and the thickness is 1 mm at a maximum.SELECTED DRAWING: Figure 1

The invention relates to the technical field of optical functional materials, in particular to transparent biphase glass ceramics for rare earth induction associated crystallization, a preparation method and application. According to the preparation method, SiO2, ZnF2 and KF are taken as matrix glass raw materials, rare earth and transition metal ions are taken as optical activity doping ions, precursor glass is prepared through melting, and the transparent biphase glass ceramic is obtained through annealing, heat treatment and associated devitrification. The transparent dual-phase glass ceramic prepared by the invention contains KYb3F10 nanocrystals and KZnF3 nanocrystals, and compared with glass ceramic containing K2SiF6 and ZnF2 nanocrystals, the bandwidth luminous efficiency of the transparent dual-phase glass ceramic is improved by more than 100 times; the method provides good reference for preparation of two-phase glass ceramics of more different systems, and has important application prospects in the fields of broadband optical fiber amplifiers and tunable optical fiber lasers.

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.

The invention relates to a melt crystallization purification method of beta-methylnaphthalene, and relates to the field of beta-methylnaphthalene purification, and the melt crystallization purification method comprises the following steps: sequentially carrying out first cooling crystallization, second cooling crystallization, third cooling crystallization, sweating operation, melting, recrystallization and devitrification on molten beta-methylnaphthalene to obtain beta-methylnaphthalene with the purity of more than or equal to 99.8%, wherein the second cooling crystallization is assisted by first microbubble treatment. According to the method provided by the invention, by virtue of a specific cooling crystallization process, the uniformity of crystal growth is ensured, the risk that a crystal layer is too thin or too thick in the prior art is avoided, the separation efficiency of the crystal is improved, efficient separation and extraction of high-purity beta-methylnaphthalene are realized, and the purity of the obtained beta-methylnaphthalene is greater than or equal to 99.8%.

The invention discloses environment-friendly glass with a high refractive index and an application of the environment-friendly glass. The environment-friendly glass with the high refractive index is prepared from the following oxides in percentage by mass: 27.0 to 35.0 wt.% of B2O3, 42.0 to 48.0 wt.% of La2O3, 4.0 to 10.0 wt.% of Nb2O5, 6.0 to 12.0 wt.% of Gd2O3, 0.5 to 4.0 wt.% of Y2O3, 0.1 to 4.0 wt.% of SiO2, 0.5 to 5.0 wt.% of ZnO, 0 to 5.0 wt.% of TiO2 and 0 to 5.0 wt.% of Ta2O5. The environment-friendly high-refractive-index glass has the following advantages that the environment-friendly high-refractive-index glass does not contain any one of heavy metal oxides such as As2O3, Sb2O3, BaO, PbO, Tl2O, CdO, BeO and V2O5 harmful to the environment, the refractive index is larger than or equal to 1.76, the devitrification resistance, the chemical stability and the mechanical strength are excellent, and the invention further provides application of the environment-friendly high-refractive-index glass to wearable AR equipment.

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.

Systems of reducing devitrification within a chemical vapor deposition system can include a susceptor support ring that is configured to be positioned between a gas inlet and a gas outlet of a chamber passage. An example system can also include a getter support comprising a support base and one or more recesses therein. Each of the one or more recesses can be arranged to receive corresponding one or more support elements that are configured to support the getter plate. At least a portion of the getter support may include a coating comprising silicon carbide (SiC) having a thickness of at least about 50 microns. The getter support may be arranged to be disposed a maximum distance of between about 1 mm and about 10 mm from the susceptor support ring.

Provided is a glass production method that can suppress devitrification of glass and increase the productivity of the glass. A glass production method according to the present invention includes the steps of: pouring a melt 11 obtained by melting a raw material of a glass 18 into a mold 13; and cooling the melt 11 to obtain the glass 18, wherein the mold 13 has a bottom surface 14a and a side surface 15a and, in the step of cooling the melt 11, the mold 13 is cooled from a direction of the bottom surface 14a.

Provided are: a glass for pharmaceutical containers, which has excellent chemical durability, transparency and devitrification resistance; and a glass tube for pharmaceutical containers, which is obtained therefrom. This glass for pharmaceutical containers is characterized by containing, as a glass composition, 65%-80% of SiO2, 1%-10% of Al2O3, 5%-20% of B2O3, more than 0% but not more than 0.1% of MoO3, 0-10% of MgO + CaO + SrO + BaO, and 1%-20% of Li2O + Na2O + K2O.

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 present invention provides a glass material that maintains desired optical properties and is less likely to exhibit defects such as crystallization or devitrification products. The glass material of the present invention is characterized in that the refractive index is 1.8 or more, and the content of Al2O3 is more than 0 and 500 ppm or less.

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.