37 results about "Strontium fluoride" patented technology

The present invention relates to a device for optically measuring the temperatures of cryogenic fluids or of moving surfaces in such fluids by analyzing the decay in the luminescence of a doped crystal, the device comprising a light source for exciting said crystal, an optical fiber for transporting the light flux emitted by said source to the crystal and for returning to a detection assembly the luminescent light emitted by the crystal as a result, and a measurement probe past which the fluid or the moving surface moves, wherein the doped crystal is constituted by one of the crystals from the group comprising strontium fluoride doped with divalent ytterbium, SrF2:Yb2+; and calcium fluoride doped with divalent ytterbium, CaF2:Yb2+. In a preferred embodiment for measuring the temperatures of moving surfaces, the measurement probe includes a fiber for transmitting the light flux emitted by the light source plus at least one receiver fiber for returning the light emission given off by the doped crystal which is presented in the form of a crystal covering covering a determined location on the surface to be scanned, each of said fibers being surrounded by a metal capillary.

The invention discloses a two-phase stainless steel electrode, which comprises a core wire and a coating, wherein the coating is coated on the outer wall of the core wire and accounts for 0.4 to 0.5 percent of the total weight of the electrode. The core wire comprises the following components in percentage by weight: 0.005 to 0.030 percent of C, 0.01 to 0.20 percent of Si, 1.50 to 2.50 percent ofMn, 0 to 0.025 percent of P, 19.0 to 22.0 percent of Cr, 9.0 to 11.0 percent of Ni, 2.5 to 3.5 percent of Mo and the balance of Fe. The coating comprises the following components in percentage by weight: 8 to 20 percent of calcium carbonate, 2 to 15 percent of barium carbonate, 5 to 15 percent of calcium fluoride, 6 to 17 percent of strontium fluoride, 4 to 16 percent of barium fluoride, 9 to 18 percent of cryolite, 4 to 10 percent of rutile, 1 to 5 percent of titanium white, 2 to 8 percent of silicon dioxide, 3 to 9 percent of chromium powder, 1 to 1.5 percent of molybdenum powder, 0.1 to 4 percent of magnesium powder and 5 to 13 percent of iron powder. After the coating components are uniformly mixed, an adhesion agent is added into the mixture. The two-phase stainless steel electrode has high strength, high tenacity and intercrystalline corrosion resistance; and during welding, an electric arc is stable, splashing phenomena is reduced, a welding seam is well molded, slag is easy toremove, and the electrode has high operability.

The present invention relates to an optical element coated with a dense uniform fluoride film, further to a method of manufacturing such coated elements. The coating is a coating that co-evaporates to form a coating of L-H coating with a high ("H") refractive index fluoride material and a low ( "L") refractive index material (a coating of L and H materials co-deposited). Lanthanides (e.g., neodymium, lanthanum, dysprosium, yttrium and gadolinium, and combinations thereof) are preferred metal fluorides used as high refractive index materials, especially preferably lanthanum fluoride (LaF 3 and gadolinium fluoride (GdF 3 )。 Aluminium fluoride (AlF 3 and alkaline earth metal fluoride (calcium, magnesium, barium and strontium fluoride) is preferred low refractive index material, magnesium fluoride (MgF 2 ) is preferred alkaline earth metal fluoride.

The invention discloses a rare earth-doped fluorozirconate luminescent material and a preparation method thereof. The chemical composition of the material is Sr(1‐x)ZrF6:xRE3+, where RE=Eu, Tb, Ce or Dy, 0.5%≤x≤7.0%; its preparation method is as follows: solid strontium fluoride and rare earth oxide The stoichiometric ratio is accurately weighed and put into the lining of the reaction kettle, then the fluozirconic acid and deionized water are added, stirred, the mixture is put into the reaction kettle, and reacted at 120-220°C to obtain a well-crystallized micron rod-shaped luminescent material. The phonon energy of the material is low, the non-radiative relaxation rate of the luminescence center is low, and the luminescence efficiency is high. The material particles are dispersed and not agglomerated, which is conducive to the application of coated pipes. The material has a high degree of crystallinity, a stable matrix, and can be applied in a humid environment without hydrolysis. The material can be used in energy-saving lamps and high-pressure mercury lamps, and has simple preparation process and low equipment requirements.

The invention discloses a composition of an oversized model area fluorphosphate optical fiber and a preparation method thereof. The composition of the oversized model area fluorphosphate optical fiber mainly comprises an optical fiber core part and an optical fiber cladding part. The formula comprises aluminium metaphosphate, calcium metaphosphate, lithium fluoride, barium fluoride, magnesium fluoride, strontium fluoride, zirconium fluoride, lanthanum fluoride, yttrium fluoride and rare earth oxides. The composition has the structure of gain guidance-refractive index anti-guidance, the diameter of the fibre core of the gain guidance-refractive index anti-guidance optical fiber is far more than the diameter (4-10 mu m) of the fibre core of the common monomode optical fiber, and the mode field area can be above ten thousands square microns. The core diameter is 100-500 mu m; the cladding is composed of multicomponent glass, and the cladding diameter is about 250-650 mu m; and the difference delta n between the fiber core and the cladding is less than 0.05-0.28% and solves the problem that the mode field diameter is more than 100 mu m and the problem of monomode transmission characteristics.

The invention discloses a method for preparing a strontium fluoride or rare-earth doped strontium fluoride film by adopting electrolytic deposition. The method comprises the following steps of: 1) cleaning an ITO conductive glass twice or thrice by using acetone, then cleaning the ITO conductive glass in an ultrasonic cleaner for 10 to 30 minutes by using deionized water, activating the ITO conductive glass for 10 to 30 seconds in 10 percent nitric acid solution, and cleaning the ITO conductive glass by using the deionized water for later use; 2) adding sodium ascorbate and ammonium fluoride solution into compound solution of 0.01 to 0.5mol / L ethylene diamine tetraacetic acid and strontium ions, and adjusting the pH value to be between 6 and 9 to obtain electrolyte for later use; and 3) placing the ITO conductive glass serving as a working electrode, a platinum electrode serving as a counter electrode and a calomel electrode serving as a reference electrode into the electrolyte to perform electrolytic deposition so as to obtain the strontium fluoride film at an anode deposition potential of 0.8V to 1.4V relative to the calomel electrode. The method has the advantages of simple equipment, low cost and normal-pressure low temperature, is suitable for scientific research, and is expected to realize large-scale industrialized production.

The invention relates to a neodymium-doped strontium fluoride laser transparent ceramic. According to the invention, neodymium ions and a strontium fluoride matrix undergo a chemical reaction to form a displacement solid solution, and hot-pressing sintering, post-treatment and other operations are carried out so as to obtain the laser transparent ceramic with a density approximate to 99.8%. A preparation method for the laser transparent ceramic comprises the following steps: preparing Nd<3+>: SrF2 nanometer powder by using an azeotropic distillation process and then carrying out azeotropic distillation with n-butanol as an entrainer to maximally remove moisture in gel, wherein obtained powder is not prone to agglomeration, has uniform particle size distribution, and has a grain size of 15 to 30 nm; and preparing the laser transparent ceramic by using vacuum hot-pressing sintering technology with LiF as a sintering aid. The prepared laser transparent ceramic has maximum transmittance of 85.83% in visible and near-infrared wave bands and has strong absorption peaks at 576 nm, 735 nm and 796 nm. The preparation method is simple, suitable for large-scale production and low in cost; and the prepared laser transparent ceramic has good optical homogeneity.

A strontium fluoride ball and its production are disclosed. The procedure includes preparing ammonium fluoride solution with concentration 5.0-38g / L, preparing strontium nitrate solution with concentration 4.5-105g / L, adding ammonium fluoride solution into strontium nitrate solution in proportion=2:1, precipitating out deposits with ultrasonic 6-30mins, centrifugal separating out deposits, washing by water and alcohol, and vacuum drying at room temperature to obtain white powdery SrF2 nanometer ball.

The invention discloses a manufacturing method of anti-impact soft no-woven cloth. The method comprises the steps that 1, fiber adhesive dipping is conducted, and hot-pressing is conducted on single-fiber layers; 2, hot-pressing is conducted on two-layer composite fiber layers; 3, hot-pressing is conducted on two-layer composite fiber layers with two to four rolls to prepare the anti-impact soft no-woven cloth with four to eight composite fiber layers, wherein adhesives used in the method comprises ethylene vinyl acetate copolymers, waterborne polyurethane resin, terpene resin, polyethylene glycol, o-methoxyhydroquinone and strontium fluoride. According to the manufacturing method of the anti-impact soft no-woven cloth, the adhesives are improved, a multi-component composite formula is adopted, the bonding strength and the bonding density of the adhesives on fibers are effectively improved, and the tenacity and the anti-impact property of the no-woven cloth are improved; freezing and unfreezing are conducted on the fibers which are dipped in the adhesives, the internal stress and the surface tension of the adhesives are effectively decreased, and hot-pressed composite fiber layers have higher strength and anti-impact capacity.