285 results about "Transparent ceramics" patented technology

The invention discloses red fluorescent transparent ceramic for laser display and a preparation method of the red fluorescent transparent ceramic. The chemical formula of the transparent ceramic is (K0.99-yLiy) 2 (Si1-xMx) F6: 0.02 Mn < 4 + >, M = Ge or Ti, x is the mole percent of M doping, x is greater than or equal to 0.01 and less than or equal to 0.15, y is the mole percent of Li doping, and y is greater than or equal to 0.03 and less than or equal to 0.45; the preparation method comprises the following steps: preparing nanoscale fluoride powder by adopting a hydrothermal synthesis method, and then preparing the fluorescent transparent ceramic by adopting a hot pressed sintering method. Under the excitation of a blue light LD chip with the wavelength of 450 nm, the red light fluorescent ceramic material prepared by the invention realizes the emission of highlight narrow-band red light with the emission wavelength of about 630 nm, has the full width at half maximum of 20-30 nm, the transmittance of 74-78% and the chromaticity coordinate of about (0.682, 0.322), and can be used in the field of laser display.

A transparent ceramic material is manufactured by molding a source powder into a compact, the source powder comprising a rare earth oxide consisting of at least 40 mol % of terbium oxide and the balance of another rare earth oxide, and a sintering aid, sintering the compact at a temperature T (1,300° C.≤T≤1,650° C.) by heating from room temperature to T1 (1200° C.≤T1≤T) at a rate of at least 100° C. / h, and optionally heating from T1 at a rate of 1-95° C. / h, and HIP treating the sintered compact at 1,300-1,650° C. The ceramic material has improved diffuse transmittance in the visible region and functions as a magneto-optical part in a broad visible to NIR region.

The invention discloses a color-permeable colorful ceramic and a preparation process thereof, and belongs to the technical field of ceramic preparation processes, a transparent AlON ceramic body is formed by low-temperature diffusion bonding sintering, an adjustable structural color of 480-630 nm is realized through TiO2 / ZrO2 nanocrystalline spacing (180-220 nm), a Sm2O3 chemical color is superposed, delta E is less than or equal to 0.5, and the color is changed along with the angle and does not fade; after decoration firing of a finished product, embossment line patterns can be engraved inside and outside the ceramic body through femtosecond laser, due to the fact that the main body of the ceramic body is high in light transmittance, when light directly irradiates or enters the interior from the top as a bottle, halo of the embossment line patterns engraved inside and outside can be scattered on the surface, and the overall optical effect is improved; the ceramic is suitable for high-grade decorative ceramics such as bottles and ornaments.

The invention discloses an infrared band optical frequency conversion element and a converter and a laser using the infrared band optical frequency conversion element, nonlinear optical polycrystalline transparent ceramic is adopted, and a processing area and an unprocessed area which are periodically and regularly distributed are arranged in the nonlinear optical polycrystalline transparent ceramic in the light passing direction. The refractive indexes of the processing area and the unprocessed area are different, so that a phase grating with periodically distributed refractive indexes is formed; the processing area is used for providing phase differences among the fundamental frequency light, the signal light and the difference frequency light, and the processing area does not have a nonlinear optical effect. Difference frequency laser output of an infrared band can be realized, and optical frequency conversion is realized in nonlinear optical polycrystalline ceramic by adopting a periodic phase adding method.

It is described a process for producing transparent ceramic bodies with at least two zones having different garnet composition, in particular in which one of said zones has composition Y3AI5O12. The invention is especially useful for the production of transparent ceramic bodies having preset complex shapes and / or a controlled complex distribution of doping ions.

The invention discloses a quartz fiber with an yttrium oxide coating and a preparation method of the quartz fiber, and belongs to the field of preparation of wave-transparent ceramics. Aiming at the problem that the performance of the existing quartz fiber is reduced at a high temperature, the invention provides the preparation method of the quartz fiber with the yttrium oxide coating, which comprises the following steps: impregnating the quartz fiber by using yttrium oxide sol, and drying and sintering the impregnated quartz fiber to obtain the quartz fiber coated with the yttrium oxide coating on the surface; the preparation process of the yttrium oxide sol comprises the following steps: sequentially adding a coordination agent and a stabilizer into a yttrium nitrate solution, stirring and dissolving to form a mixed solution, adding a pH regulator to adjust the pH value of the mixed solution to 7-8, heating to a target temperature, and cooling to obtain the yttrium oxide sol. The yttrium oxide coating covers the surface of the quartz fiber, so that the high-temperature sintering resistance of the quartz fiber can be greatly improved; the preparation process of the yttrium oxide sol is simple in technology and low in cost, the prepared yttrium oxide sol is good in stability and can be better attached to the surface of the quartz fiber, and the dipping effect is improved.

The invention relates to a high-etching-resistance yttrium-magnesium complex-phase transparent ceramic and a preparation method and application thereof.The preparation method comprises the following steps that magnesium oxide and yttrium oxide are mixed according to a preset proportion to obtain a base material, yttrium-containing fluoride is added to serve as a sintering aid, the adding mass of the yttrium-containing fluoride accounts for 1-10% of the mass of the base material, and the base material is sintered to obtain the high-etching-resistance yttrium-magnesium complex-phase transparent ceramic; forming a multiphase ceramic green body; and sintering the multiphase ceramic green body in an inert oxygen-free atmosphere to obtain the yttrium-magnesium multiphase transparent ceramic with high etching resistance, the etching depth of the yttrium-magnesium multiphase transparent ceramic with high etching resistance is 300 to 500 nm / h. Compared with the prior art, the yttrium-containing fluoride is adopted as the sintering aid, a stable protective fluorinated layer is formed on the surface of the ceramic, the etching resistance of the ceramic is improved, meanwhile, the risk of decomposition and impurity introduction in an etching environment is avoided, and the high-etching-resistance yttrium-magnesium complex-phase transparent ceramic is particularly suitable for etching equipment in semiconductor manufacturing.

The invention discloses a Joule heat heating-based YAG transparent ceramic rapid welding method, and belongs to the technical field of welding. According to the method, a Joule heat ultra-fast high-temperature heating method is utilized, and a glass solder is adopted for connecting YAG transparent ceramics, so that a joint with high strength and high light transmittance is obtained. The method specifically comprises the following steps: carrying out grinding and polishing treatment on the YAG ceramic surface; the preparation method comprises the following steps: weighing oxide raw materials according to the composition of the glass material, uniformly mixing, and preparing glass powder by adopting a melting-water quenching method; preparing the glass powder into slurry, and uniformly coating the surface of the transparent YAG ceramic with the slurry; and placing in an ultra-fast high-temperature sintering furnace for connection. According to the Joule heat ultra-fast high-temperature connection YAG transparent ceramic, connection is completed within one minute through the fast heating and cooling process, a connector with high strength and high light transmittance is obtained, and the production efficiency is greatly improved.

The invention discloses a near-net-shape preparation process of high-light-transmittance large-size magnesium aluminate spinel ceramic, and belongs to the technical field of preparation of high-performance transparent ceramic. The process comprises the following steps: firstly, mixing magnesium aluminate spinel raw material powder with a lithium-free composite sintering aid according to a mass ratio, wherein the composite sintering aid consists of magnesium fluoride, ytterbium fluoride and ytterbium oxide according to a molar ratio; performing cold isostatic pressing on the mixed powder to prepare a preformed blank, crushing, and performing high-low pressure circulation pressurization near-net forming. The obtained green body is firstly subjected to hot pressing and presintering, then placed in a fluorine-containing atmosphere to be treated and finally subjected to hot isostatic pressing sintering, and a finished product is obtained through aftertreatment. According to the technology, the bottleneck of large-size component preparation is successfully overcome, net forming of the magnesium aluminate spinel ceramic with the diagonal size larger than 400 mm is achieved, the light transmittance of a finished product in the wavelength range of 400 nm to 800 nm exceeds 93%, the breaking strength reaches 194 MPa or above, and meanwhile the raw material cost and equipment dependence are remarkably reduced.

The invention belongs to the technical field of transparent ceramics and electronic packaging materials, and particularly relates to a low-thermal-expansion-coefficient transparent glass ceramic and a preparation method thereof. The base glass is prepared from the following components in percentage by mass: 60 to 65 percent of SiO2, 20 to 25 percent of Al2O3 and 4 to 10 percent of Li2O, the mass ratio of Li2O to Al2O3 is 0.22 to 0.3, the mass ratio of Li2O to SiO2 is 0.08 to 0.1, and the mass ratio of Al2O3 to SiO2 is 0.33 to 0.5; 2%-5% of a sintering aid B2O3; the nucleating agent at least comprises ZrO2, and the proportion of the components in the total raw materials is as follows: 1%-5% of ZrO2, 0%-3% of ZnO, 0%-3% of TiO2, 0%-1% of P2O5, 0%-4% of Al2TiO5 and 0%-3% of (BaO + CaO + SrO); the Al2TiO5 and the TiO2 are not used at the same time; the doping substance is a mixture of La2O3 and CeO2 and accounts for 0.5%-1% in total; and the clarifying agent is a mixture of SnO2 and CaF2 and accounts for 0.5%-1% in total. The preparation method comprises the steps of raw material melting and water quenching, grinding and sieving, granulation forming, sintering by a three-step sintering method, ion exchange treatment and the like, and finally the transparent glass ceramic with low thermal expansion coefficient, high light transmittance and high bending strength can be obtained.

The invention belongs to the technical field of transparent ceramics, and discloses a high-entropy transparent ceramic and a preparation method and application thereof. The molecular formula of the high-entropy transparent ceramic is (LuxYySczYbmErn) 2O3, x is more than or equal to 0.05 and less than or equal to 0.6, y is more than or equal to 0.05 and less than or equal to 0.6, z is more than or equal to 0.05 and less than or equal to 0.6, m is more than or equal to 0.05 and less than or equal to 0.6, n is more than or equal to 0.05 and less than or equal to 0.6, and x + y + z + m + n is equal to 1, Lu2O3 powder, Y2O3 powder, Sc2O3 powder, Yb2O3 powder, Er2O3 powder and ZrO2 powder are subjected to ball milling and mixing, calcined and molded at 800-1200 DEG C to prepare a biscuit, and the biscuit is subjected to pressureless sintering at 1600-1800 DEG C in vacuum, annealed and polished to prepare the high The relative density of the ceramic is 99.5% or above, the transmittance at 1000 nm is 76% or above, and the ceramic has good optical, mechanical, corrosion-resistant and radiation-resistant performance and can be applied to the field of nuclear energy window material preparation.

The invention belongs to the technical field of functional ceramics, and particularly discloses a method for preparing rare earth doped garnet transparent ceramics through tape casting, which comprises the following steps: taking rare earth doped garnet powder, Karlan gum and a dispersing agent, adding water, and carrying out wet ball milling to prepare ceramic slurry; defoaming the ceramic slurry, and carrying out tape casting to prepare a ceramic biscuit; and discharging glue from the ceramic biscuit, and sintering in a vacuum environment. According to the invention, rare earth doped garnet powder is used as a main raw material, a certain amount of a Karlan gum organic monomer and a dispersant are added to prepare ceramic slurry, and tape casting is adopted to prepare the transparent ceramic. The rare earth doped garnet powder is cured in a network molecular structure by utilizing a network macromolecular structure of the Karlan gum, and dissolved matters in a solvent cannot migrate along with directional movement of the solvent in a drying process, so that the uniformity of components and structures of a green body is ensured, and the transparent ceramic with high transparency, high density and good uniformity is prepared.

The invention is suitable for the technical field of ceramic materials, and relates to lanthanum calcium sulfide transparent ceramic powder and a preparation method thereof. Comprising the following steps: weighing nitrate containing La and Ca according to a certain molar ratio, respectively dissolving into deionized water, and uniformly mixing to obtain a solution A; adding a citric acid solution into the solution A, adjusting the pH value with ammonia water, and stirring to obtain a mixed solution; the mixed solution is heated and stirred for a period of time, white transparent sol is formed through hydrolysis and polymerization reaction, and then the sol is placed in a drying box to be dehydrated into dry gel; heating the dried gel at high temperature to obtain lanthanum calcium sulfide precursor powder; and putting the lanthanum-calcium sulfide precursor powder into a tubular furnace, and vulcanizing in a sulfur-containing atmosphere to obtain the lanthanum-calcium sulfide powder. The method has the beneficial effects that the operation steps are simple, and the production cost and the production difficulty are effectively reduced. And gel organic components are removed by means of spontaneous combustion treatment, and the raw material proportion and reaction conditions are accurately controlled, so that the powder purity is greatly improved. In the hydrolysis and polymerization reaction, citric acid complexation is utilized and reaction conditions are strictly controlled, so that the particle size of the powder is uniform, the dispersity is good, and the transparency, the mechanical property and the optical property of the transparent ceramic are improved. Besides, by adjusting parameters such as raw material proportion, solution pH value, reaction temperature and time and the like, the performance of the powder is flexibly regulated and controlled, and diversified requirements on the performance of the lanthanum calcium sulfide ceramic powder in different application scenes are met.

The invention discloses preparation and application of YAG transparent ceramic suspension for plasma spraying, Y2O3 powder with high purity of 99.99% is selected to be prepared into slurry, the slurry is ball-milled, centrifuged, dried and sieved to obtain Y2O3 powder, the obtained Y2O3 powder and Al2O3 powder with high purity of 99.99% are weighed according to a stoichiometric ratio of Y3Al5O12 to prepare mixed slurry, spray granulation, calcination, dry grinding and sieving are carried out, and the YAG transparent ceramic suspension for plasma spraying is obtained. And the obtained powder is prepared into suspension liquid for plasma spraying. The YAG transparent ceramic serves as a plasma spraying coating, is high in hardness and can effectively resist scraping and abrasion of external objects, the abrasion resistance of the surfaces of the coated objects is enhanced, and the service life is prolonged. The supersonic plasma spraying technology is adopted, preparation of the YAG transparent ceramic coating which is high in density, low in porosity, uniform in structure and high in hardness is achieved, and physical and chemical reactions occurring in the long-term service process of the Y2O3 coating material are avoided.

The invention discloses a method for preparing high-transparency yttrium iron garnet ceramic by combining a chemical synthesis way with pressureless sintering. The method comprises the following steps: synthesizing submicron alpha-iron oxide powder; forming the powder; and carrying out pressureless sintering in an oxygen atmosphere. The YIG transparent ceramic prepared in the invention has very high transmittance (the highest transmittance is 40% at 1.5 m) in an infrared band, and the YIG transparent ceramic with high optical quality (the transmittance is as high as 75% at 1.5 m) can be obtained by combining oxygen hot isostatic pressing sintering. And the preparation process is simple, the synthesis conditions are easy to control, the material synthesis period is short, energy and cost are saved, and the requirements of industrial production are met.

The invention discloses an infrared transparent ceramic material with a wide transmission wave band and a preparation method of the infrared transparent ceramic material, and belongs to the field of inorganic ceramic materials. The chemical formula of the infrared transparent ceramic material is (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O, and x is more than 0 and less than 4%; 0 < y < 30%; re is one of Zn < 2 + >, Mn < 2 + > and Ni < 2 + >; the preparation method of the infrared transparent ceramic material comprises the following steps: firstly, preparing primary Y2O3-(Mg1-yRey) O powder; placing the powder and a binder in a ball milling tank, adding a solution of a compound of Re < 2 + > with the molar percentage of x, and carrying out ball milling to obtain slurry; drying, crushing, sieving and calcining the slurry to obtain (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O powder; the preparation method comprises the following steps: performing equiaxial bidirectional pressure forming on Y2O3 nano powder, then adding (Y < 1-x >, Re < x >) 2O3-(Mg < 1-y > Re < y >) O powder for forming, and then adding Y2O3 nano powder for forming to obtain a ceramic biscuit with a composite structure; and performing double-sided laser sintering on the ceramic biscuit, removing Y2O3 on the upper surface layer and the lower surface layer, and performing double-sided polishing treatment to obtain the infrared transparent ceramic material. The biscuit composite structure design and the laser sintering technology are adopted, the oxygen vacancy defect generated by traditional sintering can be effectively avoided, therefore, an air annealing technology is not needed, and meanwhile the problems that the valence state of Re < 2 + > is unstable and oxidation is prone to occurring are effectively avoided. The densification of the multiphase ceramic is realized in an extremely short time by laser sintering, the grain size is effectively inhibited, the grain scattering is avoided, and the near-infrared transmittance of the ceramic is improved.

The invention belongs to the technical field of new materials, and discloses a composite material, a preparation method thereof and automobile glass, the composite material is a curved surface, and comprises a composite matrix, a glass plate and an organic back plate from bottom to top in sequence; wherein the composite matrix comprises a plurality of transparent ceramics and a glass matrix, and the plurality of transparent ceramics are spliced and laid in the glass matrix to form a structure that the glass is filled with the transparent ceramics. According to the invention, glass is taken as a matrix, a plurality of transparent ceramics are taken as filling bodies to form a composite matrix structure of partitioned transparent ceramic filled glass, and the composite matrix structure is compounded with a glass plate and an organic back plate, so that the composite material of the curved transparent ceramic filled glass with high safety, light weight, large size (1000mm * 1800mm) is obtained, the light transmittance is 64.2-81.2%, and the bending strength reaches 168.4-213.7 MPa.

The invention is suitable for the technical field of ceramic materials, and relates to lanthanum calcium sulfide transparent ceramic powder with wide spectrum transmittance and a preparation method of the lanthanum calcium sulfide transparent ceramic powder. The preparation method specifically comprises the following steps: weighing nitrate containing La and Ca according to a specific molar ratio, respectively dissolving the nitrate containing La and Ca into deionized water, and fully mixing to obtain a solution A; adding a thiourea solution into the solution A, and stirring to obtain a mixed solution; heating and continuously stirring the mixed solution, and carrying out hydrolysis and polymerization reaction to form white sol; then, the sol is placed in a drying oven to be subjected to dehydration treatment until the sol is converted into dry gel; and heating the dried gel at high temperature to obtain lanthanum calcium sulfide precursor powder. And putting the lanthanum-calcium sulfide precursor powder into an atmosphere furnace, and carrying out vulcanization reaction in a sulfur-containing atmosphere to prepare the lanthanum-calcium sulfide powder. The preparation method has the advantages that the operation process is simple, the prepared powder is uniform in particle size, high in purity and excellent in dispersity, and the optical performance of the transparent ceramic can be improved.

The preparation method comprises the following steps: performing by adopting a dry pressing process, compacting by adopting a cold isostatic pressing process to prepare a curved-surface transparent ceramic biscuit, sintering at high temperature, performing CNC (Computer Numerical Control) precision machining, and polishing and grinding the surface to obtain curved-surface transparent ceramic; fixing the curved-surface transparent ceramic with the opening facing upwards, overlapping at least two layers of cut plain glass on the curved-surface transparent ceramic in sequence, spraying silicon dioxide between every two layers of glass and on the surface of the ceramic, and heating and softening in a bending furnace to be tightly attached to the surface of the curved-surface transparent ceramic; sequentially laminating the organic plate, the plurality of layers of plain glass and the curved transparent ceramic from top to bottom according to the adhesive sheets between the layers, sleeving the laminated sheets with a vacuum rubber ring, carrying out cold air pumping, transferring the laminated sheets into a high-pressure kettle, pressurizing and heating, exhausting and reducing pressure, and taking out the transparent ceramic composite FH material, so as to obtain the transparent ceramic composite FH material. And cutting off redundant films around to obtain the curved-surface transparent protective ceramic composite protective material for the vehicle.

The invention discloses a method for preparing YAG transparent ceramic by two-step sintering, which comprises the following steps: 1) weighing yttrium oxide powder and aluminum oxide powder according to a stoichiometric ratio, mixing, and carrying out solid-phase reaction to synthesize YAG powder; 2) performing dry grinding and wet grinding on the obtained YAG powder to obtain mixed slurry; 3) drying the obtained mixed slurry to obtain powder, and performing compression molding and cold isostatic pressing to obtain a ceramic biscuit; and 4) pre-sintering the obtained ceramic biscuit in an oxygen-containing atmosphere, embedding the pre-sintered ceramic with oxide particles, and carrying out hot isostatic pressing sintering to prepare the YAG transparent ceramic. On the basis of obtaining the YAG transparent ceramic with high optical quality, a microstructure with a fine grain size can be obtained, and good mechanical properties are considered; the preparation method is simple, the equipment cost and energy consumption are low, the traditional annealing step can be omitted, and a new thought can be provided for preparation of the high-performance YAG transparent ceramic.

The invention relates to the technical field of ceramic materials, in particular to high-purity yttrium oxide transparent ceramic and a preparation method thereof. The preparation method comprises the following steps: ball-milling yttrium oxide powder, a sintering aid and a solvent in a ball-milling device containing a ball-milling medium; stirring the ball-milled slurry by adopting a double-layer four-inclined-blade type stirring rod with a magnetic adsorption effect; sequentially drying and sieving the stirred slurry; and finally, calcining, forming, sintering, annealing and processing to obtain the yttrium oxide transparent ceramic. The double-layer four-inclined-blade type stirring rod with the magnetic adsorption effect is used for stirring the ball-milled slurry, so that the occurrence of impurity iron points in the yttrium oxide ceramic finished product is effectively avoided, and the yttrium oxide transparent ceramic with high optical quality is obtained. Meanwhile, an axial flow type fluid field can be formed to the maximum extent through the double-layer four-inclined-blade type, the shearing, crushing and dispersing effects are achieved, the ball milling time can be shortened, and the production efficiency can be improved.

The present invention provides: a transparent ceramic for magneto-optical elements, the transparent ceramic having practical transparency applicable to high power, such as a high thermal conductivity as compared with conventional ones, even as a composite oxide that contains a rare earth element having a large ionic radius; and a magneto-optical device.　This transparent ceramic for magneto-optical elements contains a sintered body of a composite oxide represented by formula (1), and the average ionic radius of the rare earth element in the composite oxide satisfies formula (2). Formula (1): (Tb1-x-yR1xR2y)3Al5O12 (In the formula, R1 is Y or Lu, R2 is Gd or La, 0 < x ≤ 0.4, 0 < y ≤ 0.4, and 0.05 ≤ x + y ≤ 0.45.)　Formula (2): (average ionic radius) = (1-x-y)DTb + xDR1 + yDR2 < 104.2 (In the formula, DTb is the ionic radius in the 8-coordination site of Tb3+, DR1 is the ionic radius in the 8-coordination site of R13+, and DR2 is the ionic radius in the 8-coordination site of R23+.) This magneto-optical device is an optical isolator which comprises the above-described transparent ceramic as a Faraday rotator 110.

The invention discloses a low infrared absorption coefficient Y2O3 transparent ceramic and a preparation method thereof, and the preparation method comprises the following steps: carrying out dry pressing molding on Y2O3 powder, and carrying out cold isostatic pressing treatment to obtain a ceramic biscuit; the ceramic biscuit is subjected to glue discharging at the temperature of 600-1250 DEG C; carrying out vacuum heat treatment on the biscuit subjected to glue removal under the conditions that the vacuum degree is less than or equal to 10 Pa and the temperature is 400-1550 DEG C so as to remove residual hydroxyl; pre-burning the sample subjected to vacuum heat treatment in air or oxygen; and carrying out hot isostatic pressing sintering on the pre-sintered sample to realize ceramic densification so as to obtain the Y2O3 transparent ceramic. By adopting the preparation method disclosed by the invention, an expensive high-vacuum sintering furnace does not need to be arranged, and pre-sintering of the Y2O3 transparent ceramic can be completed by using a simple atmosphere sintering furnace, so that the Y2O3 transparent ceramic with high optical quality is obtained.

The invention discloses a manganese-doped aluminum-rich magnesium aluminate spinel transparent ceramic phosphor which is of a single-phase magnesium aluminate spinel structure, and the stoichiometric formula is Mg (1-x-y) Al (2 + 2x) / 3O4: yMn, x is greater than or equal to 0.004 and less than or equal to 0.1; the preparation method comprises the following steps: firstly, preparing Mg1-x-yAl2 + 2x / 3O4: yMn single-phase ceramic powder by adopting a high-temperature solid-phase reaction, and then carrying out dry-pressing molding, pressureless pre-sintering and hot isostatic pressing treatment to obtain the high-temperature-resistant magnesium alloy. The transparent ceramic phosphor is of a block structure and has the advantages of being high in optical quality, narrow in half-peak width emission, high in thermal stability, high in thermal conductivity and the like. The high-power white-light LED packaging material can effectively replace a traditional mode of packaging powder through organic glue, is beneficial to solving the problems of heat dissipation and light efficiency conversion, is expected to improve the stability of an LED device, solves the problems of fluorescence performance reduction and the like caused by aging of plastic packaging glue in the using process of a high-power white-light LED, and is suitable for popularization and application.

A method for connecting AlON transparent ceramics and alumina ceramics with green and low-cost glass, and relates to a method for connecting AlON transparent ceramics and alumina ceramics. The present invention is to solve the technical problem that the existing AlON transparent ceramics and Al2O3 ceramics have high brazing temperatures. The present invention uses Bi2O3‑B2O3‑CaO glass as an intermediate layer for connecting dissimilar ceramics, and adopts direct brazing under air to achieve the connection of AlON and Al2O3 dissimilar ceramics, wherein the lead-free glass solder has good fluidity and excellent wetting performance with the parent materials on both sides, and at the same time, the connection layer has few defects and high reliability. The thermal expansion coefficient of the low-temperature lead-free glass solder provided by the present invention is very close to that of AlON ceramics and Al2O3 ceramics. The maximum shear strength of the obtained joint at room temperature is about 31MPa.

The present invention discloses an application of transparent ceramics as a multidimensional optical storage medium and a processing device thereof. The present invention selects transparent ceramics as an optical storage medium, utilizes a focused femtosecond polarized laser to irradiate the transparent ceramics, generates a standing wave field at the focus through interaction, thereby generating nanometer-scale structural points on the surface and / or inside the transparent ceramics as information recording points. According to the technical solution provided by the present invention, based on the interaction mechanism between inorganic transparent ceramics and ultrashort and ultraintense lasers, by changing the output pulse parameters and polarization direction of Gaussian femtosecond lasers, Gaussian femtosecond lasers are used to generate nanometer-scale microstructures to realize multidimensional optical information storage of recording points, thereby realizing multidimensional writing, providing a method for realizing long-term ultra-high-density optical storage, and solving the problem that current organic and organic-inorganic composite optical storage medium materials cannot realize long-term high-density information storage and high-speed reading.

This invention discloses a YAG-based composite laser ceramic and its preparation method. The composite laser ceramic has a five-layer structure from top to bottom: a microstructured concave YAG transparent ceramic, an Nd:YAG transparent ceramic, a YAG transparent ceramic I, a Ce,Nd:YAG transparent ceramic, and a YAG transparent ceramic II. The microstructured concave YAG transparent ceramic is used to reduce the temperature gradient and compensate for the thermal lensing effect; the Nd:YAG transparent ceramic is used to collect the energy emitted by the microstructured concave YAG transparent ceramic and to transfer the energy; the Ce,Nd:YAG transparent ceramic is used for laser energy transfer; and the YAG transparent ceramic I and YAG transparent ceramic II are used to reduce the ceramic thermal lensing effect. It is prepared using thermal bonding technology. The composite laser ceramic of this invention emits bright yellow light near 1064 nm when excited by a laser with a pump source of 808 nm. Furthermore, the composite laser ceramic has a light-to-light conversion efficiency of 19.85% and a laser threshold of 410 mW.

The invention discloses a lutetium-calcium-magnesium-aluminum-silicon garnet transparent ceramic material and application thereof in a white-light LED (light-emitting diode). The method comprises the following steps: (1) fusing SiO2, Al2O3, Lu2O3, CaO, MgO and raw materials doped with luminous ions to obtain glass liquid; (2) molding, cooling and annealing the molten glass to obtain a glass precursor; 3) performing heat treatment on the glass precursor to obtain the lutetium calcium magnesium aluminum silicon garnet ceramic; and luminous ions are more than one of Ce, Er, Nd and Cr. The method is simple, the prepared ceramic is good in luminescent property, high in heat conductivity and high in hardness, and the preparation method is simple and low in cost. The method can be used for preparing transparent ceramics with large sizes and various shapes, and is low in cost and easy for industrial production. The ceramic emits bright yellow light under the excitation of 450nm blue light, and the yellow light and the blue light are combined to generate strong white light, so that the ceramic can be used for preparing a white light LED (light-emitting diode).

The present invention relates to a method for manufacturing a transparent ceramic three-dimensional structure using 3D printing and, specifically, to a method for manufacturing a transparent ceramic three-dimensional structure using 3D printing, the method comprising the steps of: preparing transparent ceramic particles; supplying a 3D printing slurry containing the transparent ceramic particles and a photocurable resin onto a 3D device plate and then irradiating same with light to form a printing layer, and forming a three-dimensional printing structure by repeating the process of forming the printing layer; sintering the three-dimensional printing structure; and polishing the surface of the sintered structure, wherein the maximum diameter of the transparent ceramic particles is less than or equal to the thickness of the printing layer, and the surface polishing step is a chemical-mechanical composite polishing step.

The invention relates to a laser modification method of transparent ceramic and the transparent ceramic obtained by the method, and the method combines laser pretreatment (LPP) and laser shock peening (LSP) to improve the laser damage resistance (LIDT) and mechanical stability of the transparent ceramic. The technical scheme comprises step-by-step surface and deep layer laser treatment, LPP is executed preferentially to eliminate surface microdefects and improve optical transmittance and damage threshold, and then the mechanical damage resistance of the interior of the material is enhanced through the LSP technology under the condition that the laser energy density is kept lower than the safety threshold. Through strict LIDT and mechanical property tests, technological parameters are fed back and adjusted, and the performance of the transparent ceramic is comprehensively improved. The process is suitable for high-performance optical elements and laser systems requiring high optical transparency and excellent mechanical properties. The innovation not only obviously prolongs the service life of the material, but also reduces the maintenance cost, and has wide application prospects.