57 results about "Sr element" patented technology

The invention discloses a nitrogen oxide green fluorescent powder material; and the chemical general formula of the nitrogen oxide green fluorescent powder material is (Ba,A)(2-x)Siy(O,B)zN2+4y-2z:xEu, wherein 0<=x<1.0, 0<y<=1, 1<z<=2.0, A is Ca or Sr element, and B is F or Cl element. In the preparation method, two-step synthesis is adopted to prepare the nitrogen oxide green fluorescent powder and the method comprises the following steps: 1) synthesizing A2SiO4 which is the precursor of the nitrogen oxide green fluorescent powder; and 2) doping elements in the matrix structure provided by the precursor A2SiO4 to synthesize the nitrogen oxide green fluorescent powder material (Ba,A)(2-x)Siy(O,B)zN(2+4y-2z):xEu. By adopting the method, the brightness of the nitrogen oxide green fluorescent powder can be increased and the emission wavelength of the nitrogen oxide green fluorescent powder can be modulated; by adjusting the doping amount of each element, the color gamut of the nitrogen oxide green fluorescent powder can be broadened effectively; and the fluorescent powder can be used to satisfy the lighting demand and used in the white LED backlight with high color rendering index. The method is simple and practical, and is suitable for the large-scale industrial production.

The invention relates to red luminous silicon-oxygen nitride fluorescent material, preparation method and light emitting device using same. The general formula of the fluorescent material is MIuMIIv(Sil-alphaAalpha)wO deltaN(2/3(u+v)+4/3w-2/3delta): Eux, Ry, Dz, wherein MI is a Ca or Sr element; MII is selected from at least one element of Sr or Ca, Ba and Zn; A is selected from at least one element of Ge, Al, Ca and In; R is selected from at least one element of Nd, Dy, Ho, Tm, Ce, Er, Pr, Bi, Sm, Yb, Lu, Gd, Tb and Mn; D is selected from at least one ion of F-, Cl-, Br- and I-; and u, v, w, alpha, delta, x, y and z are molar coefficients. The fluorescent material capable of being excited by ultraviolet-blue-green light and emitting red light is prepared by adopting a normal pressure self-reduction synthesis method and applied to manufacture LED devices.

The invention discloses a compound processing method for simultaneously improving heat-conducting and mechanical properties of die casting aluminum alloy. The method comprises the steps of preparing and melting aluminum alloy first, adding Al-B intermediate alloy for B treatment, controlling the processing temperature between 700 and 730 DEG C, mixing until alloy components are uniform, standing and insulating, and controlling the weight percent of the B element to be 0.03 to 0.15% of the total weight of the alloy; adding Al-Sr and Al-Re intermediate alloy to melt for compound modification treatment, controlling the processing temperature between 680 and 720 DEG C, mixing until the alloy components are uniform, standing and insulating, and controlling the weight percent of the Sr element to be 0.03 to 0.2% of the total weight of the alloy; and performing refining and deslagging treatment, and discharging for cast forming after slagging off so as to obtain the compound aluminum alloy melt. The compound processing method has the advantages of simple and convenient process, easiness in implementation, easiness in control over the addition and obvious effect, and the heat-conducting and mechanical properties of the die casting aluminum alloy can be simultaneously improved and increased.

The invention discloses a die-casting aluminum alloy. The die-casting aluminum alloy comprises, by weight percentage composition, 6.0%-9.0% of Si, 0.5%-1.0% of Fe, 0.01%-0.1% of Zn, 0.01%-0.05% of Sr,0.001%-0.1% of Ni, 0.001%-0.1% of Ga and the balance Al and inevitable impurity elements. According to the die-casting aluminum alloy and the preparation method thereof, the content of Si is reasonably adjusted, Zn and Sr elements are added according to a certain proportion on the basis, and the content of Fe, Ni and Ga elements is controlled, so that the prepared die-casting aluminum alloy has the good mechanical property, heat-conducting property and relatively higher elongation.

The invention discloses a composite refinement and modification method for improving mechanical performance of an aluminium alloy. The method comprises steps as follows: an alloy A356.2 is smelted and refined for 3-5 min; then an Al-2Sc intermediate alloy and an Al-10Sr intermediate alloy are sequentially added to an alloy liquid, wherein the mass percentage of Sc ranges from 0.02%-0.08%, the mass percentage of Sr ranges from 0.02%-0.03%, and the mass ratio of Sc to Sr ranges from 2:1 to 4:1; after the temperature is kept for 8-12 min, argon is introduced for refinement again for 3-5 min; and after the mixture is left to stand for 5-10 min, the refined and modified aluminium alloy A356.2 is obtained. With the method, traces of rare earth Sc and Sr elements are added to the aluminium alloy A356.2, and the ratio of Sc to Sr is reasonably designed, so that grains in the aluminium alloy A356.2 are remarkably reduced, and the relatively good refinement effect is realized. The tensile strength is up to 208.39 MPa and is 4% higher than that of an alloy treated with a traditional refinement and modification agent, and the ductility is up to 9.87% and is 26.2% higher than that of the alloy treated with the traditional refinement and modification agent.

The invention relates to an oxynitride green emitting phosphor material containing AL element and a preparation method thereof. The preparation method adopts two steps to synthesize oxynitride green emitting phosphor, wherein in the first step, a precursor A2SiO4 of the oxynitride green emitting phosphor containing the AL element is synthesized, wherein A is one of Ca, Ba or Sr element; and in the second step, the AL element is doped in a substrate structure provided by the precursor, and the emission wavelength of the oxynitride green emitting phosphor as shown in Al-x(Si, Al) yOzN2/3+4/3y-2/3z: xEu is modulated by adjusting the proportion of Si and Al elements so that the emission peak of the product is between 520nm and 540nm. In the method, an Al element-doping mode is used to reduce the synthesis temperature of the oxynitride green emitting phosphor. The invention particularly relates to a method for modulating the emission wavelength of the oxynitride green emitting phosphor, and the method is simple and practicable, and is applicable to large-scale industrial production.

The invention relates to a method for improving the structural stability of a BaCo0.7Fe0.2Nb0.1O3-Delta oxygen permeation membrane material, which belongs to the technical field of oxygen permeation membranes. The method is characterized in that Sr element is doped into the BaCo0.7Fe0.2Nb0.1O3-Delta base material with a perovskite structure, and the obtained oxygen permeation membrane material has a chemical formula of Ba1-xSrxCo0.7Fe0.2Nb0.1O3-Delta, wherein x is equal to 0.05-0.4. The oxygen permeation membrane material provided by the method remarkably improves the phase structure stability of the BaCo0.7Fe0.2Nb0.1O3-Delta base material under the condition of high temperature and low oxygen partial pressure, and the improved oxygen permeation membrane material can be applied within wider oxygen partial pressure range and under larger oxygen concentration gradient.

The invention relates to a preparation method of an epitaxial lanthanum strontium cobalt oxide film based on radio-frequency reactive sputtering. A radio-frequency reactive magnetron sputtering technology is adopted, and factors such as sputtering power, sputtering air pressure, the flow ratio of argon to oxygen and the temperature of a substrate are taken into comprehensive consideration in the sputtering process. According to the method, the importance of post-annealing is specially emphasized, sufficient oxygen is needed in the preparation process of La(1-x)SrxCoO3 film to avoid influence on the related physical characteristics of the film caused by forming of an oxygen vacancy, the defects such as the oxygen vacancy can be overcome by the post-annealing, and the surface of the film can be smoother. The preparation method of the epitaxial La(1-x)SrxCoO3 film has the advantages of compatibility with conventional industrial production, convenience in doping, simplicity in regulation of the concentration of a doped Sr element, simplicity in selection of a target material, higher utilization rate of the target material and the like, and is widely applicable to the preparation of related spintronics devices.

The invention discloses a method for separating a heating element of Sr and a metallic element of Ba from high-level wastes, comprising the following steps: (1) the concentration of nitric acid in a nitrate solution containing the heating element of Sr and the metallic element of Ba is adjusted to 0.5 to 4 mol/L; (2) after adjusting the concentration of nitric acid, the nitrate solution flows through a chromatographic column filled with a sorbent; the heating element of Sr is adsorbed by the filled sorbent while the metallic element of Ba flows out; (3) chromatographic column adsorbing the heating element of Sr is washed by deionized water and the heating element of Sr is washed out in a form of nitrate. The method of the invention has the advantages of good separation effect, strong preferential adsorption of the sorbent and being capable of separating the heating element of Sr and the metallic element of Ba from the high-level wastes thoroughly.

The invention discloses a high-performance environment-friendly hexagonal permanent magnetic ferrite material, and belongs to the technical field of material preparation. A main formula of the permanent magnetic ferrite material is as the follows: 1.3-6.3 mol% of BaCO3, 78.3-87.2 mol% of Fe2O3, 1.2-6.2 mol% of CaCO3, 0.8-6.2 mol% of La2O3, 0.3-1.1 mol% of ZnO, 0.4-1.2 mol% of MnO and 0.8-7.2 mol%of Co2O3. Based on 100 wt% of the main formula, a dopant consists of the following components based on oxides: 0.2-0.6 wt% of SiO2, 0.5-1.5 wt% of CaCO3, 0.2-0.5 wt% of H3BO3, 0.2-1.2 wt% of Bi2O3, 0.1-1.0 wt% of La2O3 and 0.1-0.5 wt% of an isobutene-maleic anhydride copolymer (ISOBAM). According to the permanent magnetic ferrite material disclosed by the invention, Sr element in the main formulais completely replaced, and meanwhile, high B<r>, high H<cj> content and high (BH)<max> are achieved.

The invention discloses a Sr-containing heat-resisting casting magnesium alloy. The magnesium alloy is characterized by comprising the following components in percentage by mass: 3.5 to 5.5 percent of Sn, 1 to 3 percent of Si, 0.5 to 3 percent of Sr and the balance of Mg and impurities. Sn and Si elements are added in a combination manner to generate Mg2Sn and Mg2Si high-temperature strengthening phases; a Sr element is added to refine the Mg2Si phase; simultaneously, a thermal stabilization phase MgSnSr of which the heat resistance is higher than that of Mg2Sn is formed. Compared with the conventional heat-resisting casting magnesium alloy, the Sr-containing heat-resisting casting magnesium alloy has excellent room temperature and high-temperature performance and low production cost, and can be widely applied to production of automobiles, electronics and space flight and aviation parts.

The invention discloses a method for preparing a beta-tricalcium phosphate crystal material under a low temperature condition, and belongs to the technical field of biomaterials. The method comprises the following steps: preparing amorphous calcium carbonate doped with different contents of Mg and amorphous apatite doped with different contents of Mg and Sr through a rapid precipitation technology, and converting the Mg-containing calcite and the amorphous apatite containing Mg and Sr into Mg-doped or Mg and Sr codoped beta-TCP crystal material through using a hydrothermal synthesis technology. Compared with present high temperature calcining or solid phase reaction methods for preparing the beta-TCP crystal material, the method disclosed in the invention has the advantages of low reaction temperature, production cost reduction, and solving of the problem of preparation of beta-TCP crystal nanomaterial through a high temperature reaction. Mg and Sr element doping also can improve the bioactivity of the beta-TCP material, is in favor of promoting bone restoration, and has great values in the fields of bone restoration and bone transplantation.

The invention belongs to the technical field of luminescence and display, relating to blue and yellow luminescent materials in a novel rare earth double primary colour luminescent material for converting white light by utilizing a violet light LED (light-emitting diode). The structural formulas of blue phosphor powder and yellow phosphor powder are MxN(4-x-y)Si3O8Cl4: Ry and WxS(4-x-y)Si3O8Cl4: Yy. Tz, wherein N is Sr element when M is Mg, and the phosphor powder is blue when R is Eu element. When W is Ca, S is Sr element and Y is Eu element, and the phosphor powder is yellow when T is Mn element. Materials are respectively weighed according to mass percent, after fully grinding and evenly mixing, calcining at a high temperature is carried out, a mixture is taken out after cooling is carried out, grinding is carried out, then high temperature calcining is carried out, and a sample is cooled and taken out to be ground, thus a power crystal emitting bright blue light or yellow light under the excitation of violet light is obtained. The blue phosphor powder and the yellow phosphor powder are mixed in a certain proportion to realize white light phosphor powder with different colour temperatures.

The invention discloses bismuth-based leadless piezoelectric ceramic and a piezoelectric actuator with application of the material thereof, relates to the technical field of electronic ceramics and components, and specifically provides a new leadless piezoelectric ceramic material which can replace traditional lead-based piezoelectric ceramic and is used in related fields of piezoelectric actuator application. The material provided by the invention mainly contains Bi, Ti, Na and Sr elements and a small amount of other elements, and has more excellent field-induced strain performance than PZT ceramic in the applied electric field of a traditional driver. The piezoelectric actuator based on the material can be widely applied in industrial areas of piezoelectric oil atomizers, piezoelectric precision platforms and the like.

The invention discloses a thermistor material and a preparation method and application thereof. The chemical general formula of the thermistor material is LaxSr1-xCoyFe1-yO3, wherein 0.5 < x< 1, and 0 < y< 1. Four kinds of metal elements and O form a La-Sr-Co-Fe-O system. Theratio of the sum of the mole number of two elements La and Sr to the sum of the mole number of two elements Co and Fe is 1:1,0.5< x< 1, and the proportion of the element La in the thermistor material is higher than the proportion of the element Sr in the thermistor material. A test proves that the thermistor material has good crystallinity, a B value is low, and the resistivity is smaller. The thermistor material can be applied to the temperature attenuation compensation ofspecific occasions such as low temperature, high frequency and high power.

The invention provides an electrostriction material and a preparation method thereof. The invention provides the electrostriction material having the advantages of good pressure resistant performance, large deformation and low consumption by using Sr element or La element to partially replace Pb in PMN and simultaneously doping Sc2O3 and adding Cr2O3 or Bi2O3, and using a low-cost production line and optimized technological conditions. The electrostriction material can be widely applied in the fields of aerospace, precision optics, precision finishing and so on with large-deformation driving and positioning.

The invention discloses a BNT-BST-KNN anti-ferroelectric energy-storage ceramic and a preparation method thereof, which belong to the technical field of functional ceramic. A molecular formula is (1-x)Bi1/2Na1/2TiO3 xBa1/2Sr1/2TiO3-0.05KNaNbO3, wherein x is 0.01, 0.03, 0.05 or 0.07. The BNT-BST-KNN anti-ferroelectric energy-storage ceramic solves the problems that La<3+>-doped electroceramic reduces the electric field hysteresis and increases the phase-transition electric field of a material, and the anti-ferroelectric phase of B site Zr<2+> element-doped electroceramic is unstable; the added Sr element is helpful for enlarging a stable area of the tetragonal anti-ferroelectric phase, and the electricity performance of the BNT-BST-KNN anti-ferroelectric energy-storage ceramic can be changed by doping BaSrTiO3 and KNaNbO3.

The invention discloses a formula and manufacturing method of a high-performance A356 aluminum alloy, and relates to the technical field of aluminum alloy production. The formula includes the following components in percentage by mass: 6.8-7.4% of Si, 0.30-0.35% of Mg, 0.10-0.15% Ti, 0.02-0.030% of Sr, less than or equal to 0.10% of Fe, less than 0.003% of Ca, less than 0.03% of Zn, less than 0.05% of Mn, less than 0.008% of Ni, less than 0.002% of P, less than 0.05% of Cu, and the balance Al. According to the formula and the manufacturing method, Ti and Sr elements are added in a reasonable proportioning mode, and the elements of Fe, Ca, Zn, Mn, Ni, P and Cu are each controlled on a reasonable low content level, so that the formula of the A356 aluminum alloy and the formula of the manufacturing method have stable and reasonable component distribution ratio, the structure is uniform, the strength and the toughness are remarkably improved, and the market development needs are well met.

The invention discloses a preparation of Co-base porous ceramic with an adjustable and controllable pore structure. The Co-base porous ceramic is prepared from La2O3, Co3O4 and SrCO3, and is prepared by the following steps of: calculating required raw materials at a mol ratio of (1-x):x:1 of La:Sr:Co, wherein x ranges from 0 to 1; weighing and mixing the raw materials, grinding the raw materials to obtain mixed powder, and tableting the mixed powder; pre-sintering obtained tablets to obtain pre-sintered ceramic; cooling the pre-sintered ceramic to room temperature and grinding; and tableting the ceramic and sintering for the second time, so as to obtain the La(1-x)SrxCoO3 porous ceramic. The obtained La(1-x)SrxCoO3 porous ceramic material is 14-19% in porosity, 4.5-6.5g/cm<3> in density and 75-90% in relative density. The method is simple and easy to implement, and low in cost; and the preparation method of the perovskite type Co-base porous ceramic which is adjustable and controllable in pore structure and uniform in distribution, by changing the doping amount of a Sr element, can achieve control on the pore structure and the porosity.