166 results about "Transparent ceramics" patented technology

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.

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 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 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 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 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 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.

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 invention provides a preparation method of low-scattering magnesium aluminate spinel transparent ceramic, which comprises the following steps: powder purification and dispersion: carrying out acid pickling and impurity removal on magnesium aluminate spinel raw powder, and carrying out centrifugal separation to obtain wet powder; the wet powder, grinding balls and deionized water are mixed and subjected to ball milling, and ceramic slurry containing the grinding balls is obtained; freeze drying and morphology modification: performing freeze drying on the ceramic slurry to obtain fluffy powder; the fluffy powder and the grinding balls are subjected to vibration screening, the powder morphology is modified, the grinding balls are separated, and modified powder with improved fluidity is obtained; dynamic pressure forming: filling a sheath with the modified powder, and applying fluctuation type dynamic pressure under a cold isostatic pressing condition to obtain a biscuit; the dynamic pressure promotes particle rearrangement until the density of the biscuit is saturated by alternately switching high pressure and low pressure and circularly applying pressure; and densification treatment: sequentially carrying out vacuum sintering and hot isostatic pressing treatment on the biscuit to obtain the low-scattering transparent ceramic.

The invention relates to a preparation method of NaLnS2 transparent ceramic powder with high infrared light transmittance, which comprises the following steps: by taking rare earth polysulfide LnS2 powder as a raw material and sodium fluoride or sodium sulfide as an additive, mixing the raw material and the additive to prepare a precursor of the NaLnS2 ceramic powder, putting the prepared precursor powder into an improved ball milling tank, and carrying out ball milling to obtain the NaLnS2 transparent ceramic powder with high infrared light transmittance. And carrying out mechanochemical reaction in a protective gas environment, and after ball milling is finished, separating out powder to obtain the NaLnS2 transparent ceramic powder. The problem that the NaLnS2 transparent ceramic powder is easy to oxidize due to high-temperature vulcanization is solved, and the prepared NaLnS2 transparent ceramic powder is low in oxygen content and small in particle size.

The invention belongs to the technical field of multi-component garnet-based transparent ceramics, and discloses a novel multi-component garnet-based transparent ceramic for near-infrared laser. The chemical formula of the multi-component garnet-based transparent ceramic material is RE: LuxY (3-x) Al5O12. Commercial powder is adopted as a reaction raw material, an additional complex powder synthesis procedure is not needed, the difficulty and cost of raw material pretreatment are reduced, key steps such as ball milling, forming and sintering are integrated into a coherent integrated process through a high-temperature solid-phase reaction sintering method, conversion and intervention of intermediate links are reduced, and the preparation method is suitable for industrial production. Compared with the prior art, the method has the advantages that the whole technological process is simpler and clearer, standardized operation and parameter regulation and control are easy, the preparation period is greatly shortened, the production efficiency is improved, meanwhile, in the forming stage, through the mode of combining dry pressing and cold isostatic pressing, different mold designs can be flexibly adapted, preparation of large-size samples is achieved, and the regulation and control performance on the shapes of the samples is higher.

The application discloses a preparation method of high-transmittance Ce:YAG transparent ceramic, and the method comprises the following steps: taking tetraethyl orthosilicate and Al2O3 as raw materials, adding them into an ethanol solution, stirring uniformly at room temperature, heating to obtain a core-shell structure precursor, and washing and drying to obtain a core-shell structure oxide Al2O3@Si; taking Al2O3, Y2O3 and CeO2 as raw material powders, taking each raw material according to the stoichiometric ratio of corresponding elements in a chemical formula (Y 1‑x Ce x )3Al5O 12 Sintering aids, anhydrous ethanol, a dispersant, the core-shell structure oxide and the raw material powders are put into a ball mill tank to obtain a mixed slurry; the mixed slurry is sequentially subjected to drying, sieving, calcining, dry pressing, plastic packaging, sintering, annealing and polishing to obtain the transparent ceramic. The method can fill the grain boundary pores and accelerate the particle rearrangement, improve the sintering activity of the ceramic powder, thereby improving the density of the ceramic, and further improving the transmittance of the ceramic.

The invention discloses a preparation method of thermal shock resistant Nd: LuAG laser transparent ceramic. The preparation method comprises the following specific steps: weighing lutetium nitrate, aluminum nitrate and neodymium nitrate according to Lu3-xNdxAl5O12, and obtaining nano precursor powder by adopting a solvothermal method; carrying out two-step pre-sintering to form oxide powder with a sub-grain structure; and adding a thermal shock slow-release agent for main sintering, carrying out hot isostatic pressing treatment on the ceramic body after main sintering, and finally annealing in air to obtain the Nd: LuAG transparent ceramic with the density being greater than or equal to 99.9% and the thermal shock resistance temperature difference delta T being greater than or equal to 400 DEG C. The ceramics are particularly suitable for high repetition frequency laser systems.

To provide transparent ceramics that are truly transparent, have few scattering sources from visible to the near-infrared range, and are resistant to laser damage, and to provide a magnetic optical device using the same.SOLUTION: Transparent ceramics are cylindrical in shape having a surface roughness Ra of 1 nm or less on both optical surfaces, with a sample length of 20 mm. When the optical surface of the sample is placed on a black background and an image of the optical surface is acquired using 256-level grayscale, assuming that a grayscale value of the background portion is defined as GB, a highest grayscale value is defined as GH, and a grayscale average value of the central region covering 20*80% of the diameter of the optical surface is defined as GT, the following equation (1) is satisfied: (GT-GB) / (GH-GB)×100≤30%. A magneto-optical device is a light isolator that includes the above transparent ceramic as a Faraday rotator 110.SELECTED DRAWING: Figure 1

The application provides a preparation method of LiAl5O8 powder and LiAlON transparent ceramic and belongs to the technical field of transparent ceramic materials. After slurry is prepared, the preparation method is freezing drying first to obtain loose mixed material without large-particle hard agglomeration, then low-temperature solid-phase reaction is carried out, and the material is rotated and mixed every 30 minutes during the heat preservation process to realize uniform heat treatment of the material. In the application, the preparation method of the LiAl5O8 powder is a low-temperature solid-phase reaction method, and the reaction condition is simple, the cost is low, and the efficiency is high. The prepared LiAl5O8 powder is single-phase, the particle is small, the distribution is uniform, there is no large-particle agglomeration, the reaction activity is high, the dispersibility is good, and the subsequent high-energy ball milling is not needed for refinement, so the prepared LiAl5O8 powder can be directly applied to the preparation of the LiAlON transparent ceramic, and the optical transmittance of the transparent ceramic is improved.

The application belongs to the field of ceramics and relates to a preparation method of transparent ceramic profiles based on laser sintering 3D printing MgAl2O4 powder, which comprises the following steps: synthesizing MgAl2O4 powder; pickling the MgAl2O4 powder; repeatedly centrifuging and washing the MgAl2O4 powder; drying, calcining, grinding and sieving the obtained precipitate to obtain pretreated MgAl2O4 powder; heating polyurethane hot melt adhesive and soluble starch to fully dissolve them, then adding ammonium citrate and deionized water to mix them, and then adding the pretreated MgAl2O4 powder to mix them, and stirring and reacting at 50-70 DEG C; spray drying to obtain granulated MgAl2O4 powder; mixing the granulated MgAl2O4 powder, ethylenediamine, zinc stearate and ABS resin and placing them in a particle grinder to grind; adding N,N-dimethylformamide to continue grinding; spray drying to obtain modified granulated MgAl2O4 powder; and using the modified granulated MgAl2O4 powder as raw material to obtain transparent ceramic profiles through laser sintering 3D printing. The method improves the machining precision and yield of transparent ceramic profiles with high precision, special shapes and complex structures, and improves the comprehensive performance of the transparent ceramic profiles.

The present invention relates to a method for rapidly pressureless sintering to prepare high-transparency AlON ceramics by adding nano-Y2O3, belonging to the field of preparation of transparent ceramic materials. A method for rapidly pressureless sintering to prepare high-transparency AlON ceramics by adding nano-Y2O3. The nano-Y2O3 powder with a high specific surface area is added as a sintering aid to the pure-phase AlON powder, and the raw materials are mixed by ball milling. The mixed powder is prepared into AlON transparent ceramics with high transparency in a wide wavelength band by pressureless sintering. Among them, the nano-Y2O3 powder with a high specific surface area is obtained by calcining yttrium acetate powder after nodular graphite in air. This method only uses a general ball milling method to achieve uniform mixing of raw materials. The sintering uses pressureless sintering technology, with easy availability of equipment and easy implementation of technology. The heat preservation time in the sintering process is short, with good energy-saving effect, high efficiency, low preparation cost, and easy industrialization.

This invention discloses an infrared optical frequency conversion element and a converter and laser using the same. It employs a nonlinear optical polycrystalline transparent ceramic. The nonlinear optical polycrystalline transparent ceramic has periodically distributed processed and unprocessed regions along the light transmission direction. The processed and unprocessed regions have different refractive indices, forming a phase grating with a periodically distributed refractive index. The processed regions provide the phase difference between the fundamental frequency light, signal light, and difference frequency light, and these processed regions do not exhibit nonlinear optical effects. This invention enables difference frequency laser output in the infrared band by adding a periodic phase method to the nonlinear optical polycrystalline ceramic to achieve optical frequency conversion.

The application discloses a kind of curved surface transparent protective ceramic composite protective material and its preparation method, comprising: using dry pressing process preforming, then using cold isostatic pressing process compaction preparation curved surface transparent ceramic body, CNC precision machining after high-temperature sintering, surface polishing, obtain curved surface transparent ceramic;With curved surface ceramic opening upwards fixed, cut good at least two layers of plane glass is placed in sequence on the curved surface transparent ceramic, between each layer of glass and ceramic surface spray silicon dioxide, in oven heating softening closely adhered to the surface of the curved surface transparent ceramic;From top to bottom in order according to organic plate, the multilayer plane glass and the curved surface transparent ceramic each layer between film is glued, the glued vacuum rubber ring is covered and is carried out cold air extraction, is transferred to autoclave after pressurizing and heating, exhaust decompression, remove transparent ceramic composite FH material, cut off surrounding excess film and obtain the vehicle curved surface transparent protective ceramic composite protective material.

This invention discloses a spray / spray-enhanced industrial photocatalytic reactor and its method. The reactor includes a light-transmitting and pressure-resistant reaction chamber, a spray / spray unit, a lighting unit, a gas-liquid separation unit, and a pressure control unit. By atomizing the liquid to be reacted into microdroplet clusters and / or forming a thin liquid film, the equivalent optical path of the liquid phase is significantly shortened, improving light penetration and photon utilization. Simultaneously, combined with pressure control structures such as back pressure valves and pressure stabilizing tanks, and gas-liquid separation / demisting structures, controllable pressure and low pressure drop are achieved under continuous operation. The reaction chamber material is not limited to quartz glass, but can also be borosilicate glass, tempered glass, transparent ceramics, or sapphire, etc.; the light source is not limited to LEDs, but can also be xenon lamps, halogen lamps, mercury lamps, lasers, or sunlight simulators, etc. The system can operate in a cyclic or multi-stage series, suitable for the scale-up and integration of various industrial photocatalytic processes.

The invention provides a preparation method of magnesium aluminate spinel nano infrared transparent ceramics, and relates to the technical field of infrared transparent ceramics. The magnesium aluminate spinel nano infrared transparent ceramic is prepared by preparing MgAl2O4 nano powder from magnesium acetate tetrahydrate and nano aluminum oxide powder as raw materials and then carrying out spray granulation, isostatic pressing molding, pre-sintering, hot isostatic pressing sintering, annealing, polishing and other processes, has the characteristics of high density and high light transmittance, and has the average transmittance of more than 85% in infrared 3-5 [mu] m.

The invention discloses a device and a method for improving optical and mechanical properties of transparent ceramic based on laser annealing. The device comprises a multi-wavelength composite laser, an optical fiber coupling system, an optical adjusting assembly, a sample control platform, a sensing monitoring system and a central controller, the multi-wavelength composite laser comprises an ultraviolet laser and a near-infrared laser; the optical adjusting assembly comprises a concave lens, a filter I, a filter II and an attenuator which are arranged in sequence, and a ceramic sample to be processed is arranged on the five-axis servo system; the central controller is connected with the composite laser, the five-axis servo system and the sensing monitoring system. By introducing the multi-wavelength composite laser annealing technology and the real-time monitoring feedback adjusting system, the optical performance and mechanical strength of the transparent ceramic can be remarkably improved, and the method is particularly suitable for manufacturing high-power laser devices, optical elements and protective materials.

The application discloses a near-net forming preparation process of high-transmittance large-size magnesium-aluminum spinel ceramics, and belongs to the technical field of preparation of high-performance transparent ceramics. The process is characterized by the following steps: firstly, magnesium-aluminum spinel raw material powder is mixed with lithium-free composite sintering additives according to a mass ratio; the composite sintering additives are composed of magnesium fluoride, ytterbium fluoride and ytterbium oxide in a molar ratio; the mixed powder is cold isostatic pressed into a preform; after being crushed, the preform is subjected to high-low pressure cycle pressing near-net forming; the obtained blank is first hot-pressed and pre-sintered, then is treated in a fluorine-containing atmosphere, and finally is subjected to hot isostatic pressing sintering; and finally, the finished product is obtained through post-processing. The process successfully overcomes the bottleneck in the preparation of large-size components, realizes the net forming of the magnesium-aluminum spinel ceramic with a diagonal size greater than 400 mm, the transmittance of the finished product is more than 93% in the wavelength range of 400 nm to 800 nm, the bending strength is more than 194 MPa, and the raw material cost and equipment dependence are significantly reduced.

The invention relates to the technical field of ceramic powder preparation, and discloses high-dispersity AlON powder and a synthesis method thereof and a preparation method of AlON transparent ceramic, and the preparation method comprises the following steps: (1) powder mixing: taking gamma-Al2O3 and a solid carbon source as raw materials, and carrying out ball-milling mixing on the raw materials, an auxiliary agent, a dispersing agent and absolute ethyl alcohol to obtain mixed slurry; (2) drying and sieving: drying, grinding and sieving the mixed slurry to obtain mixed powder; (3) charging and air pressure sintering: charging the mixed powder into a perforated boron nitride crucible, and performing air pressure sintering on the mixed powder in an air pressure sintering furnace to obtain high-dispersity AlON powder; and (4) carbon removal. The AlON powder synthesized by the synthesis method disclosed by the invention is of a nearly spherical single-crystal structure and has good high dispersity.

The invention discloses an up-conversion luminescent transparent ceramic material and a preparation method and application thereof, and relates to the technical field of up-conversion luminescent materials.The preparation method comprises the steps that an aluminum oxide ceramic substrate is coated with layered rare earth hydroxide doped with rare earth ions, interface reaction is conducted through calcination, and the luminescent transparent ceramic material is obtained; according to the preparation method, not only can the time consumption be reduced, but also the requirements on equipment are reduced; the obtained transparent ceramic luminescent material is nontoxic and harmless to a human body, has the advantages of good mechanical strength, wear resistance and the like, and can be applied to the fields of lasers, temperature sensors, illumination and the like.

The invention discloses a transparent ceramic target material for heat dissipation of a vehicle-mounted OLED (Organic Light Emitting Diode) and a preparation method of the transparent ceramic target material, and belongs to the technical field of ceramic target materials. The preparation method comprises the following steps: firstly, enabling aluminum powder to generate AIN nano powder under the action of nitrogen, then dispersing the AIN nano powder into a solvent, sequentially adding gallium nitrate, zinc nitrate and acetylacetone, and treating after reaction to obtain AlN-coated GZO nano powder; gallium nitrate and zinc nitrate are dispersed in a solvent, a complexing agent and magnesium nitrate hexahydrate are added for dispersion, polyethylene glycol is added for a reaction, GZO-MgO composite sol is obtained, AlN-coated GZO nanopowder and the GZO-MgO composite sol are mixed, yttrium nitrate, tin tetrachloride, a binder and an ammonium polyacrylate aqueous solution are added, the mixture is stirred uniformly, and the GZO-MgO nanopowder is obtained. After the pH value is adjusted, ball milling, degassing treatment and sintering are conducted, and the transparent ceramic target material for vehicle-mounted OLED heat dissipation is obtained. The ceramic target material provided by the invention has the characteristics of high light transmittance, high electric conductivity and high heat conductivity, and can effectively prolong the service life of an OLED device.