104results about How to "Change crystal structure" patented technology

The invention belongs to the technical field of carbide ceramics, and concretely relates to a high-entropy boron-containing carbide ultrahigh temperature ceramic powder and a preparation method thereof. The molecular formula of the ceramic powder is XCyBz, wherein X is at least two of Zr, Ti, Hf, V, Nb, Ta, Cr, Mo and W, y is equal to or more than 0.6 and less 1.0, z is more than 0 and equal to orless than 0.4, and y + z = 1. The ceramic powder has a single phase face-centered cubic structure. The preparation method comprises the following steps: carrying out ball-milling mixing on at least two metal powders and C powder, carrying out pressureless plasma sintering and crushing to obtain carbide powder, mixing the carbide powder with B2O3 powder and a carbon source, and then performing high temperature sintering and crushing to obtain the ceramic powder. The ceramic powder is a single-phase solid solution, has the face-centered cubic structure, and contains the boron element, so the ceramic powder integrates the high temperature resistance of carbides and the oxidation resistance of borides, and can be used to prepare an ablation and oxidation resistant high-entropy boron-containing carbide ultrahigh temperature ceramic block or composite material.

The invention discloses a multifunctional filter material for circulating water treatment, which is prepared from 1 to 10 weight percent of nano tourmaline powder, 55 to 80 weight percent of coarse tourmaline powder, 1 to 15 weight percent of kieselguhr, 1 to 15 weight percent of sepiolite powder, 1 to 15 weight percent of scallop powder, 1 to 10 weight percent of sodium bicarbonate and 0.5 to 1 weight percent of silver-carried zeolite powder. A preparation method comprises the following steps of: stirring and mixing raw materials uniformly, injecting the uniformly mixed powder into a turntable machine, and rotating the powder for 15 to 30 minutes with controlled humidity of 15 to 50 percent and rotational speed of 20 to 200 revolutions per minute by using attapulgite of 0.1 to 1 millimeter as a core; and finally sintering the powder for 4 to 8 hours at the temperature of between 400 and 600 DEG C in a muffle furnace to form a ceramic filter material with the diameter of 1 to 10 millimeters. The filter material can effectively remove Ca2+ and Mg2+ from the water and achieve the effects of inhibiting scales, preventing corrosion and removing biological sludge.

The invention provides a packaging polyolefin processing agent composition which is a mixture of nano silicon dioxide and ethylene-vinyl acetate copolymer, wherein the mass of the nano silicon dioxide accounts for 10-40% of the total mass of the processing agent composition, and the mass of the ethylene-vinyl acetate copolymer accounts for 60-90% of the total mass of the processing agent composition. The invention also provides packaging polyolefin modified by the processing agent composition. The modification of the nano silicon dioxide has greater influences on the mechanical property, the crystallization property, the polarity, the printing property, the composite property, the residue of organic solvent, and other indexes of the polypropylene. A result shows that after the polypropylene soft packaging material is subjected to nano modification, the toughness of the polypropylene soft packaging material is greatly enhanced; meanwhile, the polarity, the printing ink adhesive force and the peel strength of the material are improved; the adsorption of the modified polypropylene on toluene is greatly reduced. After nano modification, the using performance of the polypropylene used as the soft packaging material can be greatly improved.

The invention relates to a preparation method of an element doped manganese dioxide electrode material for a supercapacitor; the preparation method is characterized in that the high-energy ball milling method is adopted to mix any one of Al, Ti, Ni and Fe with manganese atoms in manganese dioxide according to the ratio of 0.05: 0.95 and then the mixture is placed in a high-energy ball milling tank, a ball milling medium is selected from agate balls with the different diameters, ratio of grinding media to material is 20:1, ethanol is added for preventing the agglomeration, the ball milling speed is 250 turns/minute, the ball milling time is controlled to be 15 hours; products are taken out after the ball milling tank is cooled to the room temperature, the drying at the constant temperature of 80 DEG C is carried out in a drying box for 48 hours; the powder after the drying is ground in an agate mortar to obtain the element doped manganese dioxide supercapacitor electrode material prepared by ball milling. The preparation method has low cost and simple preparation technology, the obtained element doped manganese dioxide electrode material has uniform distribution, high specific capacitance and good cycle stability; the preparation method can be applied in occasions which need power supply with neutral electrolyte, high stability and high power density.

The invention relates to a metal surface nanometer powder permeating method based on laser induction shock waves. The method comprises the following steps that base materials are pretreated; a machining surface is covered with an absorbing layer; a base metal surface is covered with the absorbing layer; a restraining layer is exerted on the base metal surface; pre-impact life-extension treatment is carried out on the base metal surface on which the restraining layer is exerted; impact life extension is carried out on the base metal surface subjected to the impact life extension treatment; and base metal materials are subjected to aftertreatment. In the process of covering the machining surface with the absorbing layer, in a clean room, a thin plate is taken, and an opening with the needed size and shape is shorn out in the middle; the thin plate is attached to the surface of the absorbing layer, and the middle of the thin plate is evenly coated with nanometer particles; and the rest is removed thoroughly, and a particle coating layer with the thickness equal to that of the thin plate is formed on the surface of the absorbing layer. According to the metal surface nanometer powder permeating method, a crystal structure, orientation distribution and metal surface elementary components on the base metal surface are obviously changed, the hardness, the fatigue life, the abrasion resistance and the corrosion resistance of the metal surface are effectively improved, operation is simple, and cost is low.

The invention discloses a composite metamorphic agent and a composite metamorphic method of a regenerative cast aluminum alloy, and relates to the technical field of metamorphism of cast aluminum alloys. The composite metamorphic agent is used for composite metamorphism of the regenerative cast aluminum alloy, and comprises a Mn agent, an Al-B intermediate alloy, and an Al-Sr intermediate alloy, wherein the Mn agent is an Al-Mn intermediate alloy or a Mn additive, and the appending proportion of the Mn agent is 30%-60% of the Fe content in the regenerative cast aluminum alloy; the additive amount of a B agent in the Al-B intermediate alloy is 0.01-0.05% of the melt mass of the regenerative cast aluminum alloy, and the additive amount of Sr in the Al-Sr intermediate alloy is 0.01-0.05% of the melt mass. According to the composite metamorphic agent, the purpose of synchronously refining three phases of alpha-Al, eutectic silicon, and an iron-rich phase can be achieved, thus the elongation of the alloy can be increased, and the composite metamorphic agent is especially suitable for composite metamorphism of a regenerative aluminum-silicon alloy with the high iron content.

The invention belongs to the technical field of metal material surface treatment, and particularly relates to a method for enabling a metal surface to penetrate nano powder by laser-induced impact. The method comprises the following steps: coating on the surface of an absorption layer to form a nano particle coating layer, and covering the nano particle coating layer on a working end surface of a target material; applying a restraint layer on the absorption layer; enabling a to-be-treated substrate metal surface to face towards a laser beam, firstly carrying out pre-penetration treatment and then carrying out penetration treatment on the to-be-treated substrate metal surface; and enabling the substrate metal surface obtained by cleaning to penetrate into nano particles, thereby improving the hardness of the substrate metal surface. The method is simple in operation process, and is a metal surface treatment technology which is low in cost, efficient and green. According to the method, element components of the metal substrate surface are improved, the elements of the metal surface are re-distributed, and lattice distortion, dislocation and grain refinement are caused, so that the strength and the hardness of the metal surface are improved, and thus, the abrasion-resistance of a metal component is improved and a fatigue life of the metal component is prolonged.

A gas sensor element which may be employed in measuring the concentration of gas such O₂, NOx, or CO. The gas sensor element consists of an electrochemical cell made up of a solid electrolyte body formed by a partially stabilized zirconia and a pair of electrodes disposed on the solid electrolyte body. The electrochemical cell is subjected to an aging treatment in which the dc current is applied to the electrodes at a given voltage to enhance the activation of the electrochemical cell.

The object of the present invention is to provide a method of producing an n-type group-13 nitride semiconductor which enables resistance of the n-type group-13 nitride semiconductor to be changed, as well as, a method of producing a laser using the above method to produce a current confinement structure. There is provided a method of producing an n-type group-13 nitride semiconductor, including: preparing an n-type group-13 nitride semiconductor; and irradiating the n-type group-13 nitride semiconductor with light having a wavelength of 350 nm or more to 370 nm or less so as not to change a crystal structure of the n-type group-13 nitride semiconductor before and after the light irradiation, thereby increasing resistance of the n-type group-13 nitride semiconductor.

The invention belongs to the technical field of oxygen carriers, and discloses a perovskite type composite metal oxide oxygen carrier and a preparation method and application thereof. The perovskite type composite metal oxide oxygen carrier is of a perovskite structure, the general formula of the oxygen carrier is La<1-x>Ce<x>FeO<3>, and x is greater than 0 and less than or equal to 1. A sol-gel method is adopted in the preparation method, and the preparation method comprises the following steps: firstly, taking lanthanum nitrate, cerium nitrate and ferric nitrate as precursors, and preparinga solution from the precursors and a complexing agent; then evaporating to remove water, and converting an obtained transparent sol into a viscous gel; and aging and roasting to obtain the composite metal oxide oxygen carrier with a perovskite structure. When the perovskite type composite metal oxide oxygen carrier is chemical-looping methane reforming reaction, methane can be partially oxidized with high activity and high selectivity to prepare synthesis gas; meanwhile, the oxygen carrier is reduced to be in a low valence state, the reduced oxygen carrier can react with carbon dioxide or water vapor to be oxidized to be in a high valence state, lattice oxygen is obtained again, cyclic regeneration of the oxygen carrier is achieved, and meanwhile carbon dioxide is converted into carbon monoxide or the water vapor is converted into hydrogen gas.

The invention discloses a method for synthesizing an SAPO-35 molecular sieve by a two-mode agent, which is characterized in that the method comprises the steps of mixing aluminum source, phosphorus source, silicon source and an organic template to glue at the temperature of room temperature to 100 DEG C and preparing into the reaction mixture with the molar ratio components of a1R1+a2R2: Al2O3: bP2O5: cSiO2: dH2O, wherein R1 and R2 are the organic templates, the value of a1 is 0.5-1.8, the value of a2 is 0.1-1.0, the value of b is 0.5-1.5, the value of c is 0.05-2.5, and the value of d is 10-150; the reaction mixture undergoes hydrothermal crystallization for 0.5-500 hours at the temperature of 150-250 DEG C and the crystallization product is recovered. The R1 is hexamethylene imine, and the R2 is any of cyclohexane, piperidine, tropine, diethylamine and triethylamine. The method provided by the invention can synthesize the high-crystallinity SAPO-35 molecular sieve in a relatively wide silica content range. The SAPO-35 molecular sieve synthesized by the method of the invention is applicable to the hydrocarbon conversion technology. Applied to the olefin preparation reaction by methanol dehydration, the molecular sieve has very low alkane selectivity and high product yield of ethylene and propylene.

The invention provides high-wear-resistance regenerative aluminum alloy and a preparation method and application thereof, and relates to the technical field of aluminum alloy. The high-wear-resistanceregenerative aluminum alloy mainly comprises the following components: 7.0-12.0% of Si, 1.2-5.0% of Fe, 0.5-1.5% of Mn, 0.1-0.4% of Mg, 0.03-0.06% of B, 0.05-0.30% of RE, 0.01-0.06% of Sr, 0-0.15% ofimpurity elements and the balance of Al. The preparation method of the high-wear-resistance regenerative aluminum alloy comprises the following steps: melting waste aluminum materials; adjusting components of molten aluminum according to the requirements for the components; then adding intermediate alloy such as Al-B, Al-Sr and Al-RE according to the ratio; and refining and standing, and then pouring into ingots or tundish. By a composite modification technology, regenerated aluminum which contains an iron-rich phase with high volume fraction is prepared, and the wear resistance of the alloyis greatly improved. The high-wear-resistance regenerative aluminum alloy has the advantages of simple process, low cost and the like.

The invention belongs to the field of porous material synthesis and application, and particularly relates to a preparation method of a naphthalimide-based metal organic framework film, and an application of the naphthalimide-based metal organic framework film in hydrazine hydrate detection. The naphthalimide-based metal organic framework film is prepared from a ligand containing a naphthalimido group, zinc nitrate hexahydrate, N,N-dimethylformamide, water, ethanol and an FTO glass coated with nanometer zinc oxide in a disposable scintillation bottle by a hydrothermal technology. The prepared film has a good recognition effect on hydrazine hydrate steam. The method has the advantages of novelty, uniqueness, simple experimental steps are simple, avoiding of a complex post-treatment process,and obtaining of the required film through a one-step reaction, and the prepared film provides a good application prospect for the material in the fields of ion recognition and the like.

The invention discloses a method for preparing phosphinic acid modified aluminum hydroxide flame retardant agents, which is characterized by comprising the following steps that: the aluminum hydroxide is taken, the organic solvent glacial acetic acid is taken according to the proportion being 10 to 15 times of the mass of the aluminum hydroxide, and the organic phosphinic acid is taken according to the mol ratio of the aluminum hydroxide to the organic phosphinic acid of 1/1.0 to 2.0; the aluminum hydroxide is dispersed in the organic solvent glacial acetic acid, the organic phosphinic acid is added into the aluminum hydroxide dispersing liquid during stirring, the reaction is carried out for 24 to 36h at the room temperature to 80 DEG C after the nitrogen gas is introduced for 10 to 30 minutes, and reacted materials are obtained; and the reacted materials are filtered while being hot, solid materials are washed and dried, and the phosphinic acid modified aluminum hydroxide flame retardant agents are prepared. When the method is adopted, the prepared phosphinic acid modified aluminum hydroxide flame retardant agents have better heat stability and hydrophobicity and are used in epoxy resin composite materials, the mechanical performance and the like of the composite materials are obviously improved, and the flame retardant performance is good.

The invention discloses a preparation method of temperature-resistant iron oxide yellow. The preparation method comprises the following steps: 1. adding iron oxide yellow, zinc oxide, aluminum hydroxide and basic carbonate into a mixing machine according to the mass ratio of 70:(20-40):(1.5-3.5):(0.5-2.0), mixing for 0.5-2 hours, uniformly pulverizing the mixture in a jet mill, and mixing in the mixing machine for 0.5-2 hours until all the substances are mixed thoroughly and uniformly; and 2. calcining the mixture obtained in the step 1 at 700-1000 DEG C for 2-6 hours, and mixing in the mixing machine for 10-20 minutes, thereby obtaining the temperature-resistant zinc iron yellow product. The temperature-resistant zinc iron yellow produced by the method has the advantages of high staining power and bright color. Other metal ions are doped to change the original crystal structure of common ferrite yellow, so that the temperature resistance can reach 250-280 DEG C.

The invention discloses a preparation method for a monolithic chromium oxide catalyst. The preparation method comprises the following steps: preparing a monolithic catalyst provided with a chromium oxide coating by adopting an impregnation method: weighing a chrome precursor and dissolving the chrome precursor in deionized water, stirring the solution at normal temperature, pouring the chrome precursor on a cordierite honeycomb ceramic carrier after the chrome precursor is dissolved uniformly, after the cordierite honeycomb ceramic carrier is impregnated repeatedly, drying at 100 DEG C, and roasting for 4 hours at 300 DEG C to obtain the monolithic catalyst provided with the chromium oxide coating; preparing the monolithic chromium oxide catalyst by an alkaline liquid processing method: soaking the monolithic catalyst provided with the chromium oxide coating prepared by the step (1) in an alkaline liquid in an excessive impregnating way, wherein the PH of the alkaline liquid is 8 to 10, soaking the monolithic catalyst provided with the chromium oxide coating, roasting the monolithic catalyst provided with the chromium oxide coating for 2 to 6 hours after being dried for 12 hours, thereby obtaining the alkaline liquid surface processed monolithic chromium oxide catalyst. The catalytic oxidation of a NO reaction at normal temperature is realized; NO can be eliminated at the normal temperature; the engineering application is realized. The catalyst disclosed by the invention has a good application prospect because raw materials are easily available and the process is simple.

The invention relates to an industrial pure lead product, in particular to industrial pure lead with liquid oxidation resistance and application thereof. A main method is to add certain antioxidative microelements (selected from one or a compound of Zn, Ag, Cu, Al, Ge and Sn) in the common industrial pure lead so as to improve the antioxidant capacity of the surface of liquid lead at atmosphere pressure. The industrial pure lead product with the liquid oxidation resistance can be widely applied to preparing alloys taking Pb as a main raw material, such as Sn-Pb solder, grids of lead-acid accumulators, lead base Babbitt and the like, can reduce the surface oxidation and slag forming quantity of the alloys in industrial smelting, and achieves the aim of reducing lead loss caused by oxidation in the alloy smelting process.