60 results about "Barium tetraborate" patented technology

A laser beam in the ultraviolet region is generated at high power for along period. A green laser beam generated by a laser oscillator comes incident into a resonator from behind a first curved mirror, and circulates there, reflected by each mirror. By passing a barium borate crystal, it causes a secondary harmonic (a laser beam in the ultraviolet region) to be generated, which is taken out of the resonator via a second curved mirror. The beam waist of the laser beam passing the barium borate crystal is set to 46 mum, about double the conventional thickness, by adjusting the distance between the first curved mirror and a second flat mirror. As a result, the power density of the laser beam in the barium borate crystal is reduced to ¼ of the value according to the related art, and it is made possible to avoid rapid degradation of the barium borate crystal by excessive squeezing of the laser beam.

The invention relates to a large-sized bismuth barium borate non-linear optic crystal, which belongs to the orthorhombic system with a space group equal to Pna21 and a molecular formula equal to BaBiBo4. The crystal is made from a mixed system of bismuth barium borate, fluxing agent Bi2O3 and BaB2O4, or BaO and Bi2O3; the nonlinear optical effect of the crystal is approximately five times of that of (KH2PO4) KDP; and the crystal is transparent within a wave band of between 200 and 3,000 nm, and has the large size with 1 to 100mmx1 to 100mmx1 to 100mm. The large-sized bismuth barium borate non-linear optic crystal has the advantages of quick making speed, simple operation, low cost, large-sized and transparent crystal made by the non-linear optic crystal, wide light-transmission wave band, ideal mechanical property, infrequent fragmentation, stable physicochemical properties, no deliquescence and easy processing and preservation; moreover, the non-linear optic crystal can be used to make non-linear optical devices such as a multiple frequency generator, an upper frequency converter or a lower frequency converter and an optical parametric oscillator.

Provided area deep ultraviolet non-linear optical crystal of barium borate hydrate, a preparation method therefor and the use thereof. The chemical formula of the crystal is Ba₂B_HO₂₂H₇, belonging to monoclinic system, with the space group thereof being P2₁, the crystal cell parameters thereof being a=6.7719(10) Å, b=21.1195(4) Å, c=6.8274(10) Å, β=119.3950(10)° , and the molecular weight thereof being 752.65. The non-linear optical crystal of borate is obtained by means of programmed cooling or natural cooling using a hydrothermal method. The crystal powder has a frequency-doubled effect of about 2 times that of KDP (KH₂PO₄) and an ultraviolet cut-off edge of below 175 nm and can be used as a deep ultraviolet non-linear optical crystal. The growth process of the crystal has advantages such as simple, a low cost, a low toxicity, a short growth cycle, stable physical and chemical properties, etc. The deep ultraviolet non-linear optical crystal of barium borate hydrate Ba₂B₁₁O₂₂H₇ is widely used in the preparation of non-linear optical devices such as frequency doubling generators, upper frequency converters, lower frequency converters, optical parametric oscillators etc.

The present invention relates to a compound chlorine barium borate, a chlorine barium borate nonlinear optical crystal, and a preparation method and uses of the chlorine barium borate nonlinear optical crystal. According to the present invention, the chemical formula of the compound is Ba7B3O11Cl, the molecular weight is 1205.26, and the compound is synthesized by adopting a solid phase reaction method; the chemical formula of the chlorine barium borate nonlinear optical crystal is Ba7B3O11Cl, the molecular weight is 1205.26, the crystal does not have the symmetry center and belongs to the hexagonal crystal system, the space group is P6[3]mc, and the cell parameters are as the follows: a is 11.2266 (17) angstrom, c is 7.214 (2) angstrom, Z is 2, and V is 787.4 (3) angstrom; the frequency doubling effect of the crystal powder achieves the 0.5 time of the KDP (KH2PO4); and the crystal has characteristics of large mechanical hardness, easy cutting, easy polish processing and easy preservation, and is widely applied in preparation of frequency doubling generators, frequency up-convertors, frequency down-convertors, or optical parameter oscillators and other nonlinear optical devices.

The invention provides a rust proof coating for machinery equipment and a preparation method thereof. The coating contains the following components by weight: 30-45 parts of coal tar, 8-14 parts of maleic anhydride, 3-6 parts of modified phenolic resin, 10-20 parts of barium borate, 8-15 parts of molybdenum dioxide, 7-14 parts of aluminum tripolyphosphate, 1-3 parts of diatomite, 1-3 parts of kaolin, 1-3 parts of light calcium carbonate, 4-8 parts of propylene glycol, 0.6-1.1 parts of lead naphthenate, and 15-30 parts of deionized water. The coating provided by the invention has excellent rust resistance and wear resistance, hardly peels or blisters, has little environmental pollution, and can effectively protect the mechanical equipment, and prolong the service life of mechanical equipment.

The invention discloses a preparation method of barium metaborate nano-powder. The preparation method comprises the following steps of: A, weighing barium hydroxide and boric acid in a molar ratio of 1:2, uniformly mixing the barium hydroxide and the boric acid at room temperature, grinding the mixture from a solid state to a wet state and then from the wet state to a viscous state, and then continuously grinding the mixture for 1 to 1.5 hours; and B, baking and/or air-drying and/or roasting a product obtained in the step A to obtain low-temperature phase barium metaborate nano-powder with different crystalline state. In the preparation method, a low-temperature solid-state reaction method is adopted, the barium hydroxide and the boric acid are taken as raw materials, barium metaborate is prepared by grinding and one-step reaction; without solvent, surfactant, precipitating agent or operation steps such as suction filtration, vacuum drying, centrifugal separation and the like, complete conversion of the raw materials into products is directly realized, and the method has low energy consumption and low cost, is environment-free, and accords with requirements of green chemistry.

The invention relates to a strontium-doped barium borate ultraviolet double-refraction crystal and a preparation method thereof. The crystal has a molecular formula of Ba1-xSrxB2O4 (x=0.001- 0.23) and belongs to a trigonal system. The cell parameters of the space group R3c and Ba0.9Sr0.1B2O4 are within the transmission range of 190 to 3500 nm, the transmission rate of ultraviolet band reaches 90%, and the double refraction rate of the wavelength 533nm is: ne=1.5379, n0=1.6619, and the crystal can be used as ultraviolet double refraction crystal. The crystal is grown by using pulling method. The crystal can be widely used for Glan-Taylor and Glan-laser polarizers, especially for high-power ultraviolet polarizers.

The invention discloses hydroxyalkylamide-cured outdoor type flame retardant powder coating which is prepared from the following components in parts by mass: 65 parts of outdoor polyester resin, 4 parts of a hydroxyalkylamide curing agent, 2 parts of a smooth degassing agent, 2 parts of a leveling agent, 5-10 parts of a compound flame retardant and 17-22 parts of pigments and fillers, wherein the compound flame retardant is prepared from the following raw materials in parts by weight: 5 parts of aluminum hydroxide, 5 parts of magnesium hydroxide, 16 parts of zinc borate, 32 parts of barium borate, 6 parts of antimony trioxide and 36 parts of diatom mud. The powder coating provided by the invention adopts the self-made compound flame retardant, so that the obtained coating has low thermal conductivity, can reduce the speed of heat transfer to a protected substrate, can also effectively isolate oxygen, increases heat absorption capacity, has excellent flame retardancy, and does not affect coating leveling, weather resistance, impact resistance and other properties.

A nitric oxide sensor and method is disclosed. The sensor is based on sum-frequency mixing of a tunable, 395-nm external cavity diode laser with a 532-nm diode-pumped intracavity-frequency-doubled Nd:YAG laser in a beta-barium-borate crystal. The output from the BBO crystal is ultraviolet radiation at 227 nm and is split using a 50—50 beam splitter. Half of the radiation is directed into a reference photomultiplier tube, and the other half of the UV radiation is directed through the medium of interest and then directed into a signal photomultiplier tube. The output from the photomultiplier tubes is compared and the difference utilized to indicate the level of nitric oxide by absorption-based spectrosocpic techniques.

The invention discloses a preparation method of nano barium borate sol and application thereof in polyester flame retardance. The nano barium borate sol is prepared from barium hydroxide and boric acid through neutralizing reaction in a mixed solution of water and C2-C4 diol, wherein the highest concentration can reach 25% by weight, and the particle size is 5-80nm. The colloidal particles are dispersed uniformly, have good stability and do not form second agglomeration after long-time standing. The nano barium borate sol can be directly added into a polyester reaction system independently or after being compounded with other flame retardants, and a flame-retardant copolyester nano composite material is prepared through an in-situ polymerization way. Through the invention, the problems that the subsequence processing is difficult and the mechanical properties of materials are deteriorated seriously since an inorganic flame retardant with large powder particles is added for polyester flame retardance are solved. The preparation method disclosed by the invention has the advantages of low cost, simple process, easiness in realizing industrial production, high processability of the prepared material and the like, and brings obvious social and economic benefits.

The invention discloses an aqueous heat-insulation heat-preservation fireproof material. The aqueous heat-insulation heat-preservation fireproof material is prepared from the following components in percentage by weight: 8 to 20 percent of nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and a nano silicon oxide cake material with an ultrahigh specific surface area according to a proportion of 0.5:(1-5):1, 3 to 15 percent of glass micro-beads, 4 to 10 percent of nano titanium oxide, 1 to 8 percent of potassium titanate, 1 to 8 percent of titanium pyrophosphate, 1 to 3 percent of aluminum hydroxide, 1 to 3 percent of zinc borate, 1 to 3 percent of barium borate, 1 to 3 percent of calcium sodium metasilicate, 1 to 10 percent of aluminum silicate, 20 to 28 percent of acrylic hybrid emulsion, 1.5 to 3 percent of other assistants, and the balance of water. According to the aqueous heat-insulation heat-preservation fireproof material disclosed by the invention, the nano silicon oxide composite material obtained by compounding structurally-controlled nano silicon oxide powder and the nano silicon oxide cake material with the ultrahigh specific surface area as a core material, and by the components and corresponding optimized improvement of the proportions, the product has a good heat-flow stagnation function; and the heat conduction coefficient of the product is not more than 0.03W/(m.K), and the waterproof performance reaches A level.

The invention belongs to the field of ceramic production and particularly relates to a ground-glaze-free low-temperature transmutation zirconium white glaze formula, a preparation method and a use method thereof. The ground-glaze-free low-temperature transmutation zirconium white glaze formula includes feldspar powder, boric acid, barium borate, limestone, zinc oxide, lead oxide, lead silicate and bentonite. The glaze is low in cost, is convenient to use, is low in sintering temperature and has a unique artistic feel. Glaze surface produced by sintering the ground-glaze-free low-temperature transmutation zirconium white glaze has a zirconium white dark light bottom color, wherein irregular black spots are uniformly distributed on the glaze surface. The size and distribution density of the black spots are changed according to the model of a ceramic product and glaze thickness. The glaze surface has a stone-like appearance and a slight flowing-tendency effect, thereby achieving unique artistic effects. Porcelain produced with the glaze is increased in grade and market price and is high in economic value. The glaze can be produced in large scale, can be popularized quickly and is simple in use, thereby achieving strong market competitiveness.

The present invention discloses a preparation method and uses of a barium borate Yt crystal. Compared to the technology in existence, the monocrystal barium borate Yt in accordance with the present invention is characterized by its high luminescence intensity and light-emitting efficiency, sensitive responses and the like. Furthermore, in accordance with the present invention, said process can be used for getting barium borate Yt single crystal at conditions of air atmosphere and about 1019 DEG C, with mild experiment conditions and short reaction time; and the crystal obtained through the method possesses is characterized by its excellent quality, low material cost, simple equipment, being easy to extend. Said barium borate Yt crystal exhibits some characteristics such as high efficiency and quick-speed, when used for X-ray exploration.

The invention relates to a preparation method and application of a barium-cesium borate nonlinear optical crystal. The chemical formula of the crystal is CsBaB9O15, the molecular weight is 607.54, thecrystal belongs to a monoclinic system, the space group is Cc3; cell parameters are that a=6.4918(4) angstroms, b=11.4075(6) angstroms, c=17.2571(9) angstroms, beta=92.375(3), Z is equal to 4, and Vis equal to 1276.88 (12) angstrom<-3>. A Bridgman-Stockbarger method is adopted to grow the large-size cesium barium borate crystal, a powder frequency multiplication test method is adopted to measurethe phase matching ability of the CsBaB9O15 crystal, the powder frequency multiplication effect is 3KDP, and the ultraviolet absorption edge is close to 175 nm; the CsBaB9O15 crystal is a harmonic generator capable of realizing the quadruplicated frequency and the quintuplicated frequency of Nd:YAG(1064nm). In addition, the CsBaB9O15 crystal is colorless and transparent, does not deliquesce in the air, is stable in chemical performance, can be widely applied to various nonlinear optical fields, and can develop nonlinear optical application of an ultraviolet band.

An optical resonator fabricated from a uniaxial birefringent crystal, such as beta barium borate. The crystal is cut with the optical axis not perpendicular to a face of the cut crystal. In some cases the optical axis lies in the plane of the cut crystal face. An incident (input) electromagnetic signal (which can range from the infrared through the visible to the ultraviolet) is applied to the resonator. An output signal is recovered which has a frequency that is an integer multiple of the frequency of the input signal. In some cases a prism is used to evanescently couple the input and the output signals to the resonator.

The invention relates to a compound barium yttrium borate, a barium yttrium borate nonlinear optical crystal and a preparation method and application thereof, wherein the chemical formulas of the compound and the crystal are BaYBO4, the crystal belongs to a hexagonal system, the space group cell parameter Z is 3, the molecular weight is 301.06, and the frequency-doubled effect of the crystal is about 3 times that of KDP (KH2PO4). The compound yttrium barium borate is synthesized by adopting a solid-phase reaction method, the yttrium barium borate nonlinear optical crystal grows by adopting a high-temperature melting method or a pulling method, the crystal preparation method is simple and low in cost, and the prepared crystal is high in mechanical hardness and easy to cut, polish, process and store. The barium yttrium borate crystal obtained by the method is applied as a nonlinear optical frequency doubling device.

The invention relates to a cesium barium borate nonlinear optical crystal, and a preparation method and application thereof. The crystal has a chemical formula of CsBa<3>B<11>O<20> and a molecular weight of 983.84, and belongs to an orthogonal system; the space group of the crystal is Cmc2<1>; and the cell parameters of the crystal are as follows: a is equal to 19.011(7) angstroms, b is equal to 10.837(4) angstroms, c is equal to 8.578(3) angstroms, Z is equal to 4, V is equal to 1767.4(11) angstroms, and Moh's hardness is 4-5. The crystal is prepared by using a flux method. The cesium bariumborate nonlinear optical crystal obtained by using the method is applied to preparation of nonlinear optical devices. The crystal has a large size which is at least at a centimeter level, and has theadvantages of high preparation speed, simple operation, low cost, large size, wide light transmission band, good mechanical properties, difficult fragmentation, stable physicochemical properties, easyprocessing and the like.

The present invention relates to a method for preparing barium chloroborate whiskers. The method comprises the following steps: (1) mixing a barium-containing compound, a boron-containing compound and a fluxing agent uniformly and then grinding to a particle size of less than 60 meshes to obtain a mixture; (2) The mixture is placed in a high-temperature furnace, heated to a temperature of 690-750°C at a heating rate of 5-10°C/min, heated at a constant temperature for 4-15 hours, and then cooled to room temperature naturally to obtain a sintered product; (3) the The sintered product is put into deionized water, soaked for 2-6 hours, filtered, washed and dried in sequence to obtain white powdery barium chloroborate crystal whiskers. The invention has simple process and low cost, and the obtained barium chloroborate crystal whisker has high purity and complete crystal structure.

The invention discloses a device for improving spot quality of non-linear crystal frequency-conversion laser. The device comprises a non-linear crystal unit and a walk-off compensation crystal unit, wherein the non-linear crystal unit comprises a non-linear crystal which is composed of beta-barium borate crystals or caesium lithium borate; the walk-off compensation crystal unit comprises an uniaixal crystal which is composed of yttrium vanadate crystals or alpha-barium borate crystals. The device for improving the spot quality of the non-linear crystal frequency-conversion laser performs compensating and shaping treatment on laser spots frequency-converted by the non-linear crystal through the walk-off compensation crystal to obtain round laser spots under the premise of not losing the optical power of converting laser, thereby improving the spot quality. Meanwhile, the device for improving the spot quality of the non-linear crystal frequency-conversion laser is simple in operation, significant in effects, low in cost and capable of solving the technical problem of quality reduction of output laser spots.

The invention belongs to the technical field of ultrafast laser, and discloses a broadband optical parametric amplification method and device based on a cascaded crystal. The broadband optical parametric amplification method comprises the following steps: dividing the initial femtosecond laser into two beams, wherein the weaker beam passes through a pre-amplification stage to generate broadband seed light of a near-infrared band; the stronger beam acts as pumping light. The pumping light adjusts the time delay through a time delay line to be synchronous with the seed light in a time domain, and the pumping light and the seed light are combined by a dichroic mirror and are input into the cascade crystal together for optical parametric amplification. The cascade crystal comprises three II-type phase-matched barium borate crystals, the thicknesses and the phase matching angles of the three II-type phase-matched barium borate crystals are different, and the three II-type phase-matched barium borate crystals are used for amplifying different wave bands of the seed light. Through the amplification of the cascaded crystal, a broadband idler frequency spectrum can be efficiently obtained in a middle infrared band, and then the broadband idler frequency spectrum is compressed by a pulse compressor to finally obtain an ultrashort idler frequency light pulse with a period magnitude and astable carrier envelope phase.

The present invention discloses a flame-resistant stretching-resistant polyethylene-based electric cable material and a preparation method thereof, wherein the flame-resistant stretching-resistant polyethylene-based electric cable material comprises 14-24 parts of polyethylene, 15-28 parts of a styrene-acrylonitrile copolymer, 3-7 parts of polyphthalamide, 4-10 parts of polyamideimide, 3-9 parts of T151A polyisobutenyl succimide, 6-13 parts of a cis-polybutadiene rubber, 4-8 parts of a KH-792 silane coupling agent, 3-7 parts of tetrabromobisphenol A, 2-6 parts of barium borate, 3-5 parts of molybdenum trioxide, 4-10 parts of barium chloride, and 2-7 parts of magnesium sulfate. The preparation method comprises: stirring in a high speed stirring machine, carrying out extrusion granulation through a twin-screw extruder, plasticizing on an open mill, discharging the sheet, and cooling to obtain the electric cable material. The prepared electric cable material of the present invention has characteristics of high flame resistant strength and high tensile strength.

A combination of phosphors formulated to coat the inside of a fluorescent lamp to emit light having a spectral distribution to enhance effective pupil lumen comprising effective amounts of strontium boride, yttrium oxide, barium yttrium, europium, terbium, barium borate and calcium having a peak luminescence in the scotopic range.