120 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 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 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.

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.

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.

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 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 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.

This invention discloses a non-stoichiometric long afterglow transparent ceramic and its preparation method. The general chemical formula of the ceramic is: (RE 1‑x Ce x )3(Al 1‑y Cr y )2Ga 3+z O 12 RE is selected from Lu, Y, and Gd, and the values ​​of x, y, and z are in the range of: 0.001≤x≤0.005, 0.0005≤y≤0.02, and 0.01≤z≤0.15. This ceramic is prepared by vacuum sintering combined with hot isostatic pressing (HIP). Using garnet as the matrix, this invention employs matrix control methods and ion co-doping techniques to prepare a ceramic with a transmittance of 78–85%. The afterglow time is increased by 720–1080 minutes compared to Ce-doped long-afterglow transparent ceramics, by 180–300 minutes compared to ceramics without HIP sintering, and by 180–480 minutes compared to stoichiometric ceramics.

The invention discloses a vacuum arc-extinguishing chamber monitoring window brazing process based on transparent ceramic YAG and a vacuum arc-extinguishing chamber monitoring window, and the vacuum arc-extinguishing chamber monitoring window brazing process comprises the following steps: arranging a circular groove on the outer surface of aluminum oxide ceramic as a connecting surface of a monitoring hole and YAG, designing the connecting surface into a step-shaped structure, and cleaning the surface of the monitoring hole of an aluminum oxide ceramic shell and the brazing surface of the YAG; uniformly stirring molybdenum, manganese and titanium metal powder and the mixed solution, coating the surface of the monitoring hole and the brazing surface of the YAG with the mixed solution, and then performing sintering treatment to form a transition layer; and after a layer of nickel is electroplated on the transition layer, the Kovar ring is used as an intermediate metal piece, and the surface of the monitoring hole, the Kovar ring and the brazing surface of the YAG are sequentially brazed together, so that the monitoring window of the vacuum arc-extinguishing chamber is obtained. According to the method, materials and structures used in the brazing process are comprehensively optimized, so that generated thermal stress is low, the risk of brazing failure is greatly reduced, the rate of finished products is increased, and meanwhile the process complexity and cost are reduced.

The application belongs to the technical field of transparent ceramic material preparation, and particularly relates to a kind of transparent ceramic material and its preparation method. The transparent ceramic is prepared by first oscillating sintering the transparent ceramic powder, then heat treating and polishing, and finally forging by oscillation. The transparent ceramic is prepared by oscillating pre-sintering + heat treatment + dynamic sintering forging DSF, which successfully applies dynamic sintering forging to the preparation of transparent ceramic, directly improves the transmittance and strength of transparent ceramic, and further expands the application field and application environment of transparent ceramic.

1. A method for producing a transparent ceramic body having at least two regions with different garnet compositions, in particular one of the regions being YAlO 12 The present invention is particularly useful for producing transparent ceramic bodies having a predetermined complex shape and / or a controlled complex distribution of doping ions.

A transparent ceramic for a magneto-optical element of the present invention includes: a paramagnetic garnet-type composite oxide represented by Formula (1) and containing terbium, lutetium, and aluminum; and 100 to 1,000 mass ppm of Si as a sintering aid,         (Tb1-xLux)3Al5O12 ...     (1) wherein 0.05 ≤ x ≤ 0.45. A magneto-optical element of the present invention is an optical isolator that includes the transparent ceramic for a magneto-optical element as a Faraday rotator 110 and a polarizer 120 and an analyzer 130 before and after the Faraday rotator on an optical axis 102 and that is usable in a wavelength range of 0.9 to 1.1 µm.

The invention discloses a preparation method for improving quantum efficiency of YAG transparent ceramic, which comprises the following steps: weighing Y (3-x) RexAl (5-delta) M (delta) O12 (wherein Re is a rare earth element, x is 0.03-0.09, delta is 0.01 and 0.03, and M is Ba or Ti) according to a stoichiometric ratio, dissolving in a nitrate solution, dropwise adding ammonia water to generate a metal hydroxide / bicarbonate coprecipitate, drying, calcining, and carrying out cold isostatic pressing to obtain the YAG transparent ceramic. The high-quantum-efficiency YAG transparent ceramic is prepared by combining segmented oxygen control and a high-pressure hot isostatic pressing process. According to the invention, rare earth Re is uniformly doped through a coprecipitation method, and Ba / Ticharge compensation is assisted, so that the formation of non-radiation cross relaxation and a defect capture center is effectively inhibited, and the internal quantum efficiency reaches 93% or more and is close to the single crystal level; the preparation process comprises coprecipitation, segmented oxygen control and high-pressure hot isostatic pressing processes, complicated equipment transformation is not needed, all key parameters including doping concentration, oxygen partial pressure, heat preservation time and the like can be accurately adjusted, and the preparation method is suitable for large-scale production, application and popularization.

A kind of composite glass-ceramic for high-power LED with concave-convex surface and its preparation method, the composite glass-ceramic includes transparent ceramic and glass layer formed by glass powder coated on transparent ceramic;The chemical formula of transparent ceramic is Y 3‑x Al5O 12 : xCe 3+ ; glass powder is low melting point glass powder of MgO-Al2O3-SiO2-B2O3-RO system, wherein, R is one or more of Ca, Sr, Ba, Zn. Preparation method: YAG: Ce transparent ceramic is prepared by vacuum sintering method;Glass melting method is used to prepare precursor glass powder, and precursor glass powder is obtained after ball milling, then it is mixed with glue, and precursor glass powder is coated on transparent ceramic by silk screen printing technology, and composite glass-ceramic is obtained after sintering. The method can improve the extraction efficiency of transparent ceramic and improve the emission color;The composite glass-ceramic prepared can have the characteristics of high luminous efficiency and high color rendering index.

The invention relates to the technical field of ceramic materials, in particular to calcium lanthanum sulfide transparent ceramic powder and a preparation method and application thereof.The preparation method comprises the following steps that CaS powder and La2S3 powder are placed in a sealed quartz container, the raw materials are mixed to be uniform in an ultrasonic rotation mode, high-temperature swing sintering is conducted in a vacuum state, then slow cooling is conducted to the room temperature, and the calcium lanthanum sulfide transparent ceramic powder is obtained. And grinding to obtain the CaLa2S4 powder. According to the preparation method of the CaLa2S4 powder, the problem of sulfur loss can be avoided in a limited mode, toxic and dangerous gas of hydrogen sulfide or carbon disulfide is not used, the preparation method is safe, efficient, easy to operate, low in raw material cost and suitable for industrial batch production, and further development of the infrared transparent ceramic application technology is expected to be promoted.

The invention relates to a moldable nanocomposite for producing a transparent article made of a ceramic material, the moldable nanocomposite according to the invention comprising: an organic binder; a powder of a ceramic material dispersed in the organic binder, the powder comprising particles having a diameter in the range of 5 nm to 700 nm, and / or a precursor of a ceramic material dispersed in the organic binder, the precursor being at least one metal-containing compound; and a phase former dispersed in the organic binder, the phase former being solid or viscous at room temperature and forming an internal phase in the organic binder, wherein the combined content of the powder and the precursor of the ceramic material in the moldable nanocomposite is at least 5 parts by volume based on 100 parts by volume of the organic binder, and wherein the moldable nanocomposite does not contain any low-viscosity solvent. Furthermore, the invention relates to a method for producing a transparent article made of a ceramic material, the method according to the invention making use of a moldable nanocomposite according to the invention.

This invention discloses a transparent ceramic fiber and its preparation method. The preparation method includes: ball milling and mixing ceramic powder, photosensitive resin, dispersant, and initiator in a mass ratio of 81-84:13-16.5:0.8-4.2:0.3-0.8 to obtain a mixture; roller milling the mixture to obtain a ceramic slurry; extruding the ceramic slurry in a preheated extrusion device and curing it by passing it through a light source; and sintering the resulting shaped fiber filaments after debinding to obtain the transparent ceramic fiber. This invention enables the continuous extrusion preparation of ceramic fibers with high aspect ratio and low defects. The fiber length is controllable, with high roundness and controllable thickness, and the prepared diameter is ≤200μm. Through photocuring technology, the fiber surface is uniformly cured, which can improve the uniformity, density, and mechanical properties of the fiber. The fiber shape is self-rounded by surface tension, and the obtained fiber does not require post-processing such as polishing curved surfaces. The process is simple and has industrialization prospects.