24 results about "Transparent ceramics" patented technology

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.

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 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.

This method for producing a paramagnetic garnet-type transparent ceramic represented by formula (1) includes a step for adjusting a slurry containing a metal oxide powder raw material constituting formula (1) and a liquid medium, wherein the slurry has a median diameter D50 value of 250 nm to 1,500 nm in a particle size distribution at a concentration of 11±4 mass%, and a D95 value at a cumulative particle size distribution of 95% of 2,000 nm or less. In this method for producing a magneto-optical device, the paramagnetic garnet-type transparent ceramic is used as a Faraday rotator 110 to constitute an optical isolator 100.　(1): (Tb1-x-yRexScy)3(Al1-zScz)5O12 (in the formula, Re is Y and / or Lu, and 0≤x<0.45, 0<y<0.1, and 0<z<0.2

This invention belongs to the field of powder preparation technology, and relates to a hydrothermal synthesis method for sintering rod-shaped magnesium-aluminum spinel transparent ceramics. The method includes: dissolving Mg(NO3)2·6H2O, Al(NO3)3·9H2O, and a precipitant in water, and adding ammonia and ethylene glycol to form a mixed solution; transferring the mixed solution to a hydrothermal reactor for reaction to obtain rod-shaped MgAl2O4 powder; adding a composite sintering aid of CaF2 and Y3Al5O4 to the rod-shaped MgAl2O4 powder, ball milling and drying to obtain the powder to be sintered; pouring the powder to be sintered into an SPS graphite mold with radial constraint, compacting the powder, and then sintering it in an SPS sintering furnace to obtain the sintered ceramic; annealing and polishing the sintered ceramic to obtain a MgAl2O4 transparent ceramic sample. This invention achieves a synergistic improvement in the optical transmittance and mechanical properties of transparent ceramics.

This invention relates to a method for preparing high infrared transmittance MgAlON ceramics, belonging to the field of ceramic preparation. The method for preparing high infrared transmittance MgAlON ceramics involves ball milling and mixing 86.2-86.6 wt.% γ-Al₂O₃, 8.6 wt.% MgO, and 4.8-5.2 wt.% carbon black, followed by carbothermic reduction nitriding to synthesize pure-phase MgAlON powder with an O / N value of 9.5-12.0. CaCO₃ is added to the pure-phase MgAlON powder as a sintering aid, and after ball milling, a MgAlON / CaCO₃ mixed powder is obtained, which is then dry-pressed to prepare a green body. Finally, high infrared transmittance MgAlON ceramics are prepared using a pressureless sintering method. This method designs the composition of raw material powder and controls the degree of nitridation of MgAlON powder. Then, using this powder as raw material, MgAlON transparent ceramics are prepared by pressureless sintering under short holding time conditions. The raw materials are readily available and inexpensive. The MgAlON powder prepared has good sintering performance, and the MgAlON transparent ceramics have high infrared transmittance, good energy-saving effect, and high efficiency. It is not only low in cost, but also simple and easy to implement, making it suitable for industrial production.

This invention relates to a rapid pressureless sintering preparation method for broadband high-transmittance AlON ceramics, belonging to the field of transparent ceramic material preparation. The invention involves ball milling and mixing Y₂O₃ raw material powder and AlON raw material powder to obtain an AlON / Y₂O₃ mixed powder; then, the AlON / Y₂O₃ mixed powder is pressurized to obtain a green body; finally, the green body is pressureless sintered to obtain broadband high-transmittance AlON transparent ceramics. In the AlON / Y₂O₃ mixed powder, Y₂O₃ powder is uniformly distributed in the mixed powder in the form of single particles and clusters composed of 2-5 and 6-60 single particles, with the mass of the Y₂O₃ powder in the form of clusters of 6-60 single particles being 50%-80% of the total Y₂O₃ raw material powder. This invention is simple to operate, has a short pressureless sintering holding time, high efficiency, good energy-saving effect, and low cost. Furthermore, the prepared AlON ceramics exhibit high transmittance in both the visible and infrared bands, making it suitable for industrial production.

This invention discloses a transparent ceramic film with a gradient Y2O3 composition, its preparation method, and its applications. The gradient film is deposited on a sapphire substrate using a spin-coating process. The Y2O3 content varies gradually from the sapphire substrate to the film surface, with the Y2O3 content gradually increasing and the Al2O3 content gradually decreasing in the direction away from the substrate, making the composition of the outermost layer close to that of YAG ceramic. The preparation method includes: sequentially depositing sols of different contents onto a sapphire substrate using a spin-coating process; and subjecting the film to isostatic pressing and heat treatment to form the gradient transparent ceramic film structure. This film possesses the characteristics of a gradient composition, transparency, low stress, and high interfacial bonding strength. It can achieve a continuous and gradual change in the coefficient of thermal expansion, thereby effectively alleviating thermal stress at the interface. It has broad application prospects in heterogeneous material combinations requiring high transmission efficiency, such as laser gain media and precision optical devices.

The present application relates to the technical field of transparent ceramic preparation, and specifically discloses a preparation method of YAG nano transparent ceramic. The preparation method comprises the following steps: S1, extruding YAG nano powder to obtain a green body; S2, high pressure treatment is performed on the green body, and the pressure of the high pressure treatment is greater than or equal to 2 GPa. The present application innovatively introduces a high pressure treatment process, and high-density nano transparent ceramic can be obtained at room temperature (~ 20 DEG C). In addition, the present application also relates to the application of the ceramic prepared by the preparation method. The transparent ceramic prepared by the preparation method has good transparent performance and high mechanical performance, and is a wave-transparent material suitable for optical lens materials, transparent armor, scintillators and laser gain media.

The utility model discloses a health environmental protection type outer wall brick relates to outer wall brick field, including wall brick body, the wall brick body top is connected with the anti -aging structure, the surface of alumina column has the transparent ceramic coating that smears, the wall brick body top is seted up with the water -repellent groove, the wall brick body side is provided with the clamping mechanism of improving wall brick practicality, and the clamping mechanism includes the connecting block no. of symmetry connection in the both sides of wall brick body, the connecting block no. bottom is fixed with two insert blocks. This health environmental protection type outer wall brick, when wall brick outer wall receives light, light is through transparent ceramic coating and shines to the mirror surface of the top end of alumina column that is inclined and is not the same in direction, will reflect light, reduces the heat accumulation of wall brick body, and transparent ceramic coating can protect the antifouling and anticorrosive of alumina column, and PTFE spacer is pasted wall brick side, and the wall brick is stably protected by the characteristics such as insulation, corrosion -resistant, non -water absorption, and two water -repellent grooves can be quickly discharged with the inclined plane rainwater, and multiple protection prolongs the life of wall brick, and indirectly improves environmental protection.

This invention provides a rare-earth-doped potassium sodium niobate transparent ceramic, its preparation method, and its application. Its chemical composition is: (K 0.5 Na 0.5 ) （1‑x‑y） Eu x Y y Nb （1‑z） Ta z O3, where 0 < x < 0.1, 0 < y < 0.01, 0 < z < 0.02. The rare-earth-doped potassium sodium niobate transparent ceramic of the present invention exhibits high light transmittance and light-changing properties; with the introduction of Y and Ta, the crystal structure and microstructure of the material are changed, increasing the vacancy-related defects of the material, while inhibiting the grain growth of the material, thereby simultaneously improving the light transmittance and light-changing rate of the ceramic. Its light transmittance can reach more than 70%, and the light-changing rate can reach up to 37.58%.

An Er:YAG nanocrystal glass composite optical fiber and a preparation and application thereof, the Er:YAG nanocrystal glass composite optical fiber sequentially comprises a core, a cladding and a protective sleeve from inside to outside, wherein the core material is 2-6 mol% Er 3+ :YAG transparent ceramic, the light transmittance in the near-infrared region reaches 80% or more; the cladding material is high-purity quartz glass, the purity is 99.9% or more; the protective sleeve material is acrylic resin paint; the preparation method does not need post-treatment, is based on a melt core method, and by introducing a rear feeding process, element mutual diffusion between the core and the cladding is effectively inhibited, so that the Er 3+ :YAG nanocrystal structure can still be reserved in the core during the high-temperature drawing process; the existence of the nanocrystal causes splitting of the Er 3+ energy level, so that a super-wide gain spectrum is obtained, and the Er:YAG nanocrystal glass composite optical fiber is applied to a wideband tunable laser.

This invention discloses a method for preparing yttrium-magnesium oxide (YMO) multiphase transparent ceramics using non-aqueous gel casting, belonging to the field of ceramic preparation technology. To overcome the problems associated with water-based gel casting, this invention provides a method for preparing YMO multiphase transparent ceramics using non-aqueous gel casting, comprising: ball milling Y2O3, MgO, a dispersant, and a non-aqueous solvent; then adding epoxy resin and a curing agent and ball milling again; the resulting ceramic slurry is defoamed, cured, and dried; then subjected to debinding, sintering densification, cooling, hot isostatic pressing, annealing, and polishing to obtain the YMO multiphase transparent ceramic. This invention overcomes the difficulties in preparing large-size Y2O3-MgO nano-multiphase infrared transparent ceramics and the problem of component inhomogeneity by designing a non-aqueous solvent system and selecting a suitable gel system, and can produce complex-shaped / large-size, uniformly composed YMO nano-multiphase ceramics.

This invention discloses a composite transparent ceramic and its preparation method, belonging to the field of ceramic materials technology. To address the problems of poor uniformity, thermal shock resistance, and mechanical properties in existing yttrium-magnesium multiphase transparent ceramics, this invention provides a composite transparent ceramic and its preparation method, comprising: preparing Y₂O₃-MgO nanoparticles into multiphase transparent ceramic powder; obtaining a yttrium-magnesium multiphase layer through molding and sintering; then covering the yttrium-magnesium multiphase layer with zirconium oxide, etc., and through the bonding effect between zirconium oxide and the yttrium-magnesium multiphase layer, combined with molding, sintering, and polishing, to obtain the composite transparent ceramic. This invention adds a composite layer of materials such as zirconium oxide to the surface of the yttrium-magnesium multiphase transparent ceramic, ensuring the stability of the composite structure and significantly improving the thermal shock resistance and flexural strength of the composite transparent ceramic.

This invention relates to a low-temperature rapid preparation method for high infrared transmittance MgAlON transparent ceramics, belonging to the field of ceramic preparation. The method first designs the chemical composition of MgAlON based on the Al2O3-AlN-MgO phase diagram. Then, using 76-77 wt.% γ-Al2O3, 13-14 wt.% AlN, and 9-9.6 wt.% MgAl2O4 as raw materials, pure phase MgAlON powder is synthesized via a high-temperature solid-state method. A sintering aid is added, and the powder is ball-milled and dried to obtain a MgAlON / sintering aid mixed powder. The powder is then dry-pressed to prepare a green body. Subsequently, the green body is heated to 1780-1900℃ at a rate of 10-40℃ / min under a nitrogen atmosphere and held for 30-180 min to obtain MgAlON transparent ceramics. This method features controllable chemical composition, simple sintering equipment, low sintering temperature, short holding time, and high infrared transmittance of the prepared MgAlON ceramics. It has good energy-saving effect, high efficiency, low cost, and is suitable for the preparation of large-size and complex-shaped samples, making it easy to industrialize.

Optically transparent ceramic glass materials comprising a glassy phase containing a crystalline tungsten bronze phase comprising nanoparticles and having the formula MxWO, where M includes at least one H, Li, Na, K, Rb, Cs, Ca, Sr, Ba, Zn, Cu, Ag, Sn, Cd, In, Tl, Pb, Bi, Th, La, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb, Lu and U, and where 0 < x < 1; aluminosilicate and zinc-bismuth-borate glasses comprising at least one of Sm2O3, Pr2O3, and Er2O3 are also provided.

The paramagnetic garnet-type transparent ceramic a sintered object of a composite oxide represented by formula (1), (Tb1-x-yYxScy)3(Al1-zScz)5O12 (0.05≤x<0.4, 0≤y<0.004, 0.6≤1−x−y<0.95, 0≤z<0.004, and 0.001<y+z<0.005), which contains SiO2 as a sintering aid in an amount larger than 0 mass % but not larger than 0.1 mass %, and having an average sinter-grain diameter of 5 μm or larger. The transparent ceramic has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,064 nm and has a total light transmittance of 84.0% or greater and a forward scatter of 0.5% or less at an optical path length of 25 mm and a wavelength of 1,300 nm. In the formula (1).

A paramagnetic garnet-type transparent ceramic that exhibits a high laser damage threshold, said ceramic being a sintered body of a Tb-containing rare earth-aluminum garnet represented by formula (1), and being characterized in that the average sintered grain size is 10-40 μm, and the insertion loss at a wavelength of 1,064 nm in the optically effective region along the length direction of a 20 mm-long sample is 0.05 dB or less.(T⁢b1-x-y⁢Yx⁢S⁢cy)3⁢(Al1-z⁢Scz)5⁢O12(1)(In⁢ the⁢ formula,0≤x<0.45,0≤y<0.08,0≤z<0.2,and 0.001<y+z<0.2.)

This invention discloses a method for preparing magnesium-aluminate spinel transparent ceramics by hot-pressing sintering based on mold isolation technology, belonging to the field of transparent ceramics technology. The method involves setting an isolation layer between a graphite mold and a ceramic blank; wherein the isolation layer includes a graphite paper substrate and a homogeneous isolation layer disposed on one side of the graphite paper substrate, the homogeneous isolation layer being made of the same material as the ceramic blank. The isolation layer of this invention effectively blocks the diffusion of carbon-active substances released from the graphite matrix under high temperature and pressure into the ceramic blank, thereby significantly reducing the penetration and residue of carbon impurities inside the ceramic. This method achieves physical isolation by addressing the contamination propagation path, effectively suppressing carbon contamination in transparent ceramics at a lower cost without significantly altering the existing main process, and helps improve the optical uniformity, transmittance, and long-term reliability of the product.

Aluminum oxynitride (AlON) powder, a synthesis method thereof by direct nitridation under high pressure and use thereof, which belongs to the field of ceramic powder are presented. In the method, pure-phase AlON powder is synthesized by direct nitridation under high pressure with aluminum powder and alumina powder as starting materials. The powder has a spherical-like morphology, with a particle size ranging from 5 μm to 15 μm. The powder has good dispersibility and uniformity, and higher sintering activity. AlON transparent ceramic (1.2 mm thick) prepared from the AlON powder has a linear transmittance of more than 84%. The batch yield is on kilogram-scale; therefore, the method is suitable for large-scale production of the AlON powder.