47results about How to "Crystal phase stability" patented technology

The present invention provides a method for preparing zirconia ceramic products. The raw material includes 84-97% of monoclinic zirconia, 0-15% of yttrium oxide, and 0-3% of magnesium oxide. The raw material is pulverized to a particle size of no more than 20 microns. Isostatic pressing or hot die casting is used. The isostatic pressing green body or hot die casting green body after de-waxing is cleaned, and loaded into a high-temperature furnace for calcination, wherein the calcination temperature is 1600-1700 DEG C, and the temperature is kept for 3-6 h to obtain the product. The present invention uses the simplest process to obtain indicators surpassing that of the zirconia products produced by conventional processes. The pre-high-temperature stabilization is not needed, therefore the energy can be saved by about 50%. The chemical composition of the products and crystalline phase composition are highly consistent. The quality stability of the products is high. Other impurities will not be brought during the preparation process. The production cost is low, is 50% of conventional craft products, and 30% of novel fine ceramic products.

The invention belongs to the technical field of high polymer materials, and especially, relates to a scratch-resistant flame-retardant PP modified material. The scratch-resistant flame-retardant PP modified material is composed of the following components in parts by mass: 35 to 60 parts of block co-polypropylene, 10 to 20 parts of random co-polypropylene, 3 to 8 parts of a scratch-resistant additive, 1 to 5 parts of a toughening modifier, 2 to 7 parts of a halogen-free flame retardant, 1 to 2 parts of a flame-retardant synergist, 1 to 3 parts of a lubricant and 1 to 2 parts of an antioxidant,wherein the scratch-resistant additive is nano aluminum oxide and polypropylene grafted high-molecular-weight polyorganosiloxane, and the toughening modifier is an acrylic acid-polysiloxane rubber-methyl methacrylate multipolymer and/or an acrylic acid-ethylene propylene rubber-methyl methacrylate multipolymer. Compared with the prior art, the PP modified material disclosed by the invention has scratch resistance, and the toughness and flame retardancy of the PP modified material are correspondingly improved.

The invention discloses a fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder, and a preparation method thereof, and belongs to the technical field of luminescent material. Thepreparation method is used for solving a problem in the prior art that the fluorescent brightness of BaSi<2>O<2>N<2>:Eu<2+> nitrogen oxide is low. The chemical formula of the fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder is (Ba<1-x-y-z-m>M<x>R<y>A<z>)O*0.5SiO<2>*0.5Si<3>N<4>:mEu<2+>, wherein 0.01<=m<=0.05, 0<=x<=0.2, 0.005<=y<=0.2, 0.5<=y/z<=1, 0<x+y+z<0.5, R is used for representing at least one element selected from La, Y, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Pr, and Mn, M is used for representing at least one element selected from Ca, Sr, and Mg, A is used for representing at least one element selected from K, Na, and Li. The fluorescent brightness of the fluorescence-enhanced silicon-based nitrogen oxide cyan fluorescent powder is high, and the excitation peak value is stabilized at 490 to 500nm under blue light excitation.

The invention provides a method for preparing a Hap-PAM biological gradient compound coating. The method comprises the following steps of: preparing aqueous solution of acrylamide and suspension of hydroxyapatite isopropyl alcohol respectively from hydroxyapatite, acrylamide monomers, isopropyl alcohol and the like serving as raw materials in a certain concentration ratio, performing DC electrodeposition processing on a carbon/carbon matrix in the aqueous solution of acrylamide for some time, and placing the carbon/carbon matrix in the suspension of hydroxyapatite for hydrothermal electrophoretic polymerization; and preparing the Hap-PAM gradient compound coating which has the advantages of uniform and compact surface, complete crystal orientation and close bonding of the coating and the matrix at different deposition temperatures and voltages. Due to the advantages, particularly higher bonding force, the Hap-PAM biological gradient compound coating has a quite good development prospect in clinical application.

The invention discloses a low-voltage apparatus electrical contact material and a preparation method thereof. The preparation method is characterized in that nano-diamond and an aqueous solution of Ce3<+> cerium salt are uniformly mixed into a precursor by ultrasonic wave; the precursor is dried for 4h at the temperature of 90-100 DEC G, is loaded in a porcelain crucible, and is roasted for 1-2h under the temperature of 600-850 DEG C in a vacuum sintering furnace; a roasted product is smashed by a ball mill or a jet mill; after a wetting agent is added into and mixed with the smashed product, the mixed product and copper tungsten alloy powder are added into and uniformly mixed in a three-dimensional blender mixer in proportion; the mixed product is added into a mold for hot press molding and is sintered for 1.5-4h in the vacuum sintering furnace with the temperature of 1000 DEG C. The low-voltage apparatus electrical contact material has the advantages that the electrical contact material contains the nano-diamond, the dispersion strengthening function is realized, and the super-strong hardness and the wear-resisting property are realized; the diamond is super-strong in heat-conducting property, the surface temperature can be reduced, and the fusion welding and the electric ablation are resisted; the diamond is covered by cerium oxide, the electron work function is lower, the movement of an electric arc is dispersed, and the concentrated ablation on the contact material by the electric arc is reduced; the cost is greatly reduced as copper replaces silver.

This invention relates to a method for stabilizing, under high temperature, anatase phase nanometer titanium oxide (TO) or tetragonal phase nanometer zirconium oxide (ZO). The substantive feature is that: the obove-mentioned TO or ZO is treated, under particular temperature, by impregnation in solution containing lanthanum nitrate as stabilizator, and then being dried, sintered to obtain the final product powder. This invention is characterized by: (1), very low content of stabilizator in said powders, calculated as lanthanum oxide, being respectively 3% and 0.3% of the single layer dispersion on the TO and ZO; (2), this inventive products can be stabilized under at least 900deg.C; (3) said lanthanum oxide dispersed on the TO and ZO can effectively eliminate the growth of the particles of the TO and ZO, and eliminate agglutination, and decrease in the specific surface area.

The invention relates to a production technology for a nickel-hydrogen battery electrode material, and particularly discloses a preparation method for a hydrogen storage alloy material; the preparation method comprises the following steps of: a, measuring raw materials according to a proportion; b, sequentially inputting the raw materials into a smelting furnace with argon gas protection accordingto the feeding order of yttrium, lnthanum, cerium, manganese, samarium and nickel; c. removing moisture in the materials; d, removing low boiling point volatiles; e. fully melting the raw materials;f, repeatedly crushing and melting; g, inputting a product into the smelting furnace, wherein the temperature is raised to 850-920 DEG C, the temperature is kept for 5-10min, and then the temperatureis cooled to the normal temperature at a rate of 20-50 DEG C / min. The advantages are as follows: 1) solving the problem of Mg volatilization during alloy smelting; 2) greatly reducing the effect ofimpurities on the alloy; 3) making the internal crystal phase of the alloy more stable and increasing the number of cycles of the alloy; 4) improving the capacity of the alloy hydrogen storage material; expanding the applicable temperature of the alloy hydrogen storage material; reducing the hydrogen absorption and desorption pressure, and 5) making the alloy crystal phase more uniform.

The invention discloses a method for preparing high-purity alpha-Al2O3 by means of waste activated aluminium oxide. According to the method, after the waste activated aluminium oxide and alpha-Al2O3 seed crystal powder are mixed, the mixture enters a rotary kiln preheating tower for drying and preheating first, the preheated and mixed material enters a reaction area of a rotary kiln to complete acalcination process, the calcinated material is unloaded into a cooler for cooling, and the cooled material is screened to obtain the alpha-Al2O3. According to the method, the waste activated aluminium oxide (gamma-type activated aluminium oxide) which contains organic anthraquinone, impurities including inorganic base and the like in a process of producing hydrogen peroxide (hydrogen peroxide) through an anthraquinone method is used for preparing a high-purity alpha-Al2O3 material through a solid phase method, so that resourceful utilization of the waste activated aluminium oxide is achieved,the problems are solved that the recovery and utilization rate of the waste aluminium oxide generated in the existing hydrogen peroxide production process is low, the treatment mode is unreasonable,and resources are waste.

The invention belongs to the technical field of MCM-56 molecular sieve synthesis, and specifically discloses a method for synthesizing an MCM-56 molecular sieve by HMI (hexamethylene imine)/PI (piperidine) composite templates. According to the invention, HMI and PI are taken as the composite template, solid silica gel is selected as a silicon source, and the MCM-56 molecular sieve is synthesized under dynamic hydrothermal crystallization conditions. The dynamic hydrothermal crystallization method is realized by the manner of heating in an oil bath and magnetically stirring the reaction material. The method is simple in operation, mild in condition, and reduces the synthesis cost of the MCM-56 molecular sieve. The crystal phase of the synthesized MCM-56 molecular sieve is stable, and the synthesized MCM-56 molecular sieve is not subjected to phase transformation to form an MCM-49 molecular sieve with the prolongation of crystallization time, which enriches the species of templates for synthesizing the MCM-56 molecular sieve and provides a new method for synthesizing the MCM-56 molecular sieve.

The invention belongs to the photovoltaic field, and specifically discloses a high-stability perovskite solar cell and a preparation method therefor. The solar cell sequentially comprises a conductiveglass layer, a compact electron transmission layer, a perovskite light absorption layer, a hole transmission layer and a counter electrode layer from the bottom to the top. According to the invention, DPSI (3-(decyldimethylammonium)-propanesulfonic acid inner salt) and PbCl2 are added into the light absorption layer of the perovskite cell, and under the synergistic cooperation of the two additives, a device with high open-circuit voltage is obtained. Through element regulation and control and additive defect passivation, the key problem that perovskite commercialization is hindered due to lowstability is solved, and meanwhile, the problem that the photoelectric conversion efficiency of a binary perovskite solar cell is relatively low relative to a ternary perovskite cell is also solved.

The invention discloses black alumina ceramic and a preparation method thereof. The preparation method comprises the steps: 1) taking, by mass, 4%-6% of diboron trioxide, 13%-15% of silicon dioxide, 55%-59% of bismuth trioxide, 0.5%-2% of manganese dioxide, 16%-19% of copper oxide, 0.8%-1.5% of tungsten trioxide, 1%-1.5% of antimony trioxide and 0.8%-2% of germanium dioxide, and mixing to obtain amixture, 2) heating and melting the mixture at 950-1100 DEG C, performing water quenching, and drying the water-quenched material to obtain black granules, 3) taking 43-55% by mass of black granules,1-5% by mass of calcined kaolin, 0.5-1% by mass of titanium dioxide and 43-55% by mass of distilled water, and carrying out ball milling to obtain black slurry, and 4) immersing the alumina ceramic in the black slurry, taking out, drying, heating at 830-850 DEG C, and cooling to obtain the black alumina ceramic.

The invention discloses a silicon nitride-based ceramic welding sealing component and a preparation method thereof, and relates to the technical field of metallized ceramic processing. The invention discloses a silicon nitride-based ceramic welding sealing component which comprises a silicon nitride ceramic matrix and a metallization layer, the silicon nitride ceramic matrix is prepared from modified silicon nitride, mullite fiber, aluminum nitride, calcium oxide, titanium oxide, a binder and a dispersing agent through the steps of modified silicon nitride preparation, mixing, granulation, primary sintering, secondary sintering and the like; raw materials of the metallization layer comprise copper powder, tungsten powder, copper oxide, yttrium oxide, zinc oxide and an organic binding agent. The invention further discloses a preparation method of the silicon nitride-based ceramic welding sealing component composed of the metallization layer and the silicon nitride ceramic matrix. According to the silicon nitride-based ceramic welding sealing component, the density of the silicon nitride ceramic matrix is improved, the silicon nitride-based ceramic welding sealing component has excellent strength, hardness and fracture toughness, the tensile strength of the sealing component is improved, and the silicon nitride-based ceramic welding sealing component has excellent high-temperature resistance.