47results about How to "Precise Control of Chemical Composition" patented technology

The invention discloses a nano loaded titanium-based electric catalytic film comprising a conductive microporous separating titanium film matrix and a catalytic coating. Furthermore, the invention also discloses a preparation method of the nano loaded titanium-based electric catalytic film, which comprises the following steps of: (1) preprocessing the titanium film matrix by sand blasting, alkali washing, and acid etching: soaking the matrix after sand blasting in an NaOH solution for 0.5 to 2h, then processing for 1 to 2h in an oxalic acid solution with the mass percent concentration of 10 percent after washing to a neutral state, washing with water and drying at 100 to 120 DEG C; and (2) preparing and loading a catalytic coating: preparing the catalytic coating by adopting a sol-gel method, a thermal decomposition method, an electrodeposition method or a chemical vapor deposition method and loading at the surface of the titanium film matrix and in a hole. Furthermore, the invention also discloses a film reactor comprising the nano loaded titanium-based electric catalytic film. According to the nano loaded titanium-based electric catalytic film, the defects on material strength, range limitation of working voltage, catalytic oxidation efficacy and the like in the prior art are solved.

The invention discloses a preparation method of a BMN dielectric film, comprising the steps of: (1) preparing a citric acid water solution of niobium; (2) adding glycol into the water solution, and conducting heating and stirring; (3) preparing a glycol solution of magnesium and bismuth; (4) adding the prepared glycol solution of magnesium and bismuth into the solution obtained in step (2), thus obtaining a bismuth-magnesium-niobium sol; (5) adding ethanol into the bismuth-magnesium-niobium sol, and carrying out heating and stirring so as to obtain a bismuth-magnesium-niobium precursor solution; (6) coating a substrate with the precursor solution uniformly and drying the substrate; (7) subjecting a dried film to a heat treatment at a temperature of 500-800DEG C for 10min; (8) repeating step (6) and (7) so as to prepare a multilayered film; (9) conducting a heat treatment to the multilayer film at a temperature of 550-800DEG C for 0.5-2h, thus obtaining a BMN dielectric film with a cubic pyrochlore structure. With accurately controlled chemical components and high density, the BMN dielectric film provided in the invention has no crack and pin hole as well as other defects. Characterized by simple process and low cost, the film of the invention as a microwave dielectric adjustable material boasts good application prospects.

The invention provides a method of preparing an In-enriched light absorption layer for a CuInSe2 thin-film solar battery, belonging to the preparation of CuInSe2 semiconductor thin films. The method adopts coating-sintering process, and uses Cu-In alloy, Cu-In alloy and Se powder as raw material. The method comprises mixing Cu-In alloy, Cu-In alloy and Se powder with a molar ratio of 1:(1.1-1.25):2:(2-2.2), ball milling the mixture for 36-72 hr to form a black precursor slurry; coating the slurry on a molybdenum foil substrate or a titanium foil substrate to form a precursor thin-film, and drying at low temperature; densifying the precursor thin-film by exerting 10-300 MPa pressure, and subjecting the precursor thin-film to heat treatment under H2 atmosphere, N2 atmosphere or vacuum. The method can accurately control the chemical composition in the precursor thin-film, can ensure the preparation of the In-enriched CuInSe2 semiconductor thin-film solar battery, and is more suitable for forming the absorption layer with uniform composition, compact structure, and flat surface. And, the sintering process is performed under innoxious atmosphere, so as to be safe and practice in operation.

A preparation method for a copper-zinc-tin-sulfur nano powder material belongs to the technical field of inorganic chemical materials. The preparation method comprises the following steps of: selecting alkanolamine or polyalcohol as solvent and dissolving a compound containing Cu, Zn and Sn with the mol ratio of Cu to Zn to Sn being 2:1:1 into the solvent; then dissolving a simple substance S of which the molar weight is two times that of Cu into another alkanolamine or polyalcohol solvent; and mixing two liquid systems, stirring under the protection of inert gas, heating to 200-280DEG C, carrying out reflowing reaction for 4-10 hours and cooling to room temperature and taking black powder on a lower layer for centrifugal separating, washing and drying to obtain copper-zinc-tin-sulfur compound nano powder. The preparation method disclosed by the invention can be used for preparing the copper-zinc-tin-sulfur compound nano powder material with the advantages of nanoscale, uniformity in size, favorable dispersity and high phase purity and has the characteristics of high efficiency, high yield, low cost, favorable repeatability, simpleness in operation and easiness in control. The copper-zinc-tin-sulfur compound nano powder material prepared by the preparation method disclosed by the invention can be used for preparing slurry of a solar battery absorbing layer.

The invention discloses a preparation method of a deformed high-temperature alloy ingot. The method adopts the preparation process of raw material pretreatment, vacuum induction smelting, hot-fittingannealing, electroslag remelting, hot-fitting annealing, vacuum self-consumption and hot-fitting annealing; the cleanliness of a smelting furnace material is improved through the raw material pretreatment; electrodes with uniform components can be obtained through vacuum induction smelting; the impurities can be further reduced by electroslag remelting, so that a cast ingot is compact in structureso as to obtain an electrode ingot with more excellent quality; and vacuum self-consumption remelting further enables an alloy cast-state dendritic crystal tissues to be refined and the tissues to behomogenized so as to realize a good feeding effect, and the metallurgical defects of severe segregation, looseness, shrinkage and the like are avoided. According to the method, hot-fitting annealingafter smelting in each step is carried out, so that cracks of the electrode or the re-molten ingot in the cooling process can be prevented, and finally a high-quality cast ingot with good surface quality, no crack defect, fine cast dendritic structure, low segregation and low stress is obtained, the percent of pass of the cast ingot is improved, and the high-quality cast ingot has remarkable economic benefits.

The invention relates to a rare earth doped Bi2Te3 based thermoelectric film material which is prepared by the steps of: adding rare earth elements during vacuum melting to obtain a Bi2-xTe3REx block thermoelectric material, wherein RE represents the rare earth elements, x is equal to 0.002-0.01, and the doped rare earth elements are light rare earth elements of La and Ce; and grinding the molten material into powder particles of 200-300 mu m to be used as a raw material of a flash evaporation method. The film is prepared by adopting the flash evaporation method, and the deposited film is annealed to obtain the rare earth doped Bi2-xTe3REx thermoelectric film material. The thermoelectric property of the rare earth doped Bi2-xTe3REx thermoelectric film material is superior to an undoped Bi2Te3 based thermoelectric film material, a doping principle is that the rare earth elements have properties similar to alkaline earth, and when the rare earth elements are added, a Bi position is easily replaced to be used as donor doping, which improves carrier concentration, thus the thermoelectric property of the Bi2Te3 based film material is improved.

The invention provides a preparation method of a Cu-In-Ga-Se-S nano powder material, belonging to the technical field of inorganic chemical materials. The preparation method comprises the following steps: based on alkanolamine with a boiling point large than or equal to 180 DEG C as a solvent, dissolving Cu, In and Ga compounds into the alkanolamine in a mole ratio of Cu: (In+Ga) of 1: (1-1.5); then dissolving Se and S in the alkanolamine, wherein the sum of molar weights of Se and S is twice as heavy as molar weight of Cu; and subsequently, mixing two solutions, stirring under the protective condition of inert gas, heating to 200-280 DEG C for refluxing, maintaining the reaction for 4-10 hours and then stopping heating and stirring, cooling to room temperature, centrifuging, washing and drying the black powder on the lower layer, so as to obtain the Cu-In-Ga-Se-S nano powder material. By using the preparation method in the invention, the Cu-In-Ga-Se-S nano powder material which is in a nano grade and has uniform scale, good dispersibility and high phase purity can be prepared, the whole preparation process is high in efficiency and low in cost, and operation is simple and is easy to control. The Cu-In-Ga-Se-S nano powder material prepared by the method in the invention can be used in a solar battery as an absorption layer material.

The invention discloses a method of producing a wind power casting from blast furnace molten iron, which belongs to the technical field of casting. The method comprises the following steps: 1) adding melted iron obtained in the process of melting in a blast furnace into an arc furnace, heating the melted iron and adjusting components in the melted iron; 2) pouring the melted iron in a ladle when the temperature of and the components in the melted iron meet requirements, and carrying out desulphurization and spheroidization on the melted iron with a nodulizer; 3) adding an inoculant into the melted iron that has undergone desulphurization and spheroidization for inoculation; 4) carrying out micro-alloying on the melted iron; 5) after treatment in the previous steps, pouring the melted iron into a casting mold with casting temperature being controlled at 1300 to 1340 DEG C, and carrying out slow cooling so as to obtain the wind power casting with performance meeting requirements. The advantages of the invention are as follows: process flow is substantially shortened, production efficiency is improved, and cost is saved; the invention is of important significance to energy conservation and consumption reduction.

The invention discloses a preparation method for a large-specification manganese-containing high-entropy alloy cast ingot. The preparation method for the large-specification manganese-containing high-entropy alloy cast ingot comprises the following steps: weighing the weights of Fe, Cr, Ni and Mn according to the content of 25at.% of Fe, Cr, Ni and Mn elements in a Fe-Cr-Ni-Mn high-entropy alloy,and adding Fe, Cr, Ni and Mn into a crucible; then carrying out primary argon-filled vacuum induction smelting to obtain a primary cast ingot of the high-entropy alloy, then carrying out argon-filledconsumable electro-arc smelting twice, and finally carrying out vacuum heat treatment to obtain the large-specification manganese-containing high-entropy alloy cast ingot. In the aspect of preparationfor the high-entropy alloy, the alloy cast ingot is obtained by carrying out the primary argon-filled vacuum induction smelting, then carrying out the argon-filled consumable electro-arc smelting twice, and then carrying out the vacuum heat treatment; and the method is simple and practicable in a process for preparing a high-entropy material, high in efficiency, low in requirement on equipment, and low in cost. The high-entropy alloy cast ingot prepared by the preparation method is accurate in component and high in uniformity, and provides an excellent blank for the subsequent hot-processingprocedure.

The invention relates to a method for preparing indium niobium co-doped titanium dioxide powder through a co-precipitation method. The method comprises the following steps: (1) preparing a solution, weighting InCl3.4H2O and NbCl and respectively dissolving in absolute ethyl alcohol, thereby obtaining an InCl3 solution and a NbCl5 solution; (2) weighting TiCl4 and dissolving in absolute ethyl alcohol, thereby obtaining a TiCl4 absolute ethyl alcohol solution; (3) dropwise adding the InCl3 solution into the NbCl5 solution, thereby obtaining a mixed solution A; (4) dropwise adding the TiCl4 absolute ethyl alcohol solution into the mixed solution A, thereby obtaining a mixed solution B; (5) using ammonium hydroxide for adjusting pH of the mixed solution B till pH is more than or equal to 11, thereby forming a suspension; (6) performing suction filtration on the suspension, drying the obtained precipitate, grinding and sieving, thereby obtaining precursor powder; (7) roasting the precursor powder prepared in the step (6) at 1100-1200 DEG C, thereby obtaining the indium niobium co-doped titanium dioxide powder.

The invention discloses a manufacturing method for an airspace engine combustion chamber inner wall blank. The manufacturing method comprises the steps that S1, Cu, Cr and Zr materials are weighed; S2, the materials obtained in the step S1 is subjected to vacuum induction melting, and an alloy solution is obtained; S3, the alloy solution obtained in the step S2 is poured to obtain an alloy cast ingot; S4, the alloy cast ingot obtained in the step S3 is subjected to forging, upsetting, drawing-out and punching treatment, and a combustion chamber inner wall blank is obtained; S5, the combustion chamber inner wall blank obtained in the step S4 is subjected to solid heat melting treatment; S6, the combustion chamber inner wall blank treated in the step S5 is subjected to upsetting and secondary chambering treatment; S7, the treated combustion chamber inner wall blank is subjected to rough turning, aging heat treatment, performance detection and finish turning treatment, and the combustion chamber inner wall blank is obtained; and S8, size detection and appearance detection are conducted on the combustion chamber inner wall blank obtained in the step S7, and packaging is conducted. The manufacturing method for the airspace engine combustion chamber inner wall blank is reasonable in process design, the obtained combustion chamber inner wall blank can meet the high-strength and high-heat-dissipation requirements of an airspace engine combustion chamber, and the manufacturing method is suitable for large-scale popularization.

The invention discloses a process for smelting a special alloy steel. The process comprises a primary smelting process and a refining process, wherein, the primary smelting process is completed in an atmosphere state, the refining process is completed in a vacuum induction furnace. The invention can greatly shorten the smelting period, improve the production efficiency, have low demand for the quality of the smelting base material, use little or not use pure metal raw materials in the primary smelting process, simplify the processing technology and reduce the production cost. At the same time, the process can precisely control chemical compositions, which creates a good condition for obtaining the stable performance and giving full play to the role of alloy elements, can obviously improve the property of alloy and adjust the refining time, temperature and vacuum degree in a wide range, which creates a favorable thermodynamics condition and a favorable kinetics condition for metallurgical reaction.

The invention discloses a smelting method of weathering resistant steel for direct-reading spectrum standard. The smelting method of the weathering resistant steel for the direct-reading spectrum standard adopts a vacuum induction furnace for smelting, and comprises processes of charging, vacuum heating, degassing, deoxidation, alloying and tapping, and the processes are as follows: (1) charging: charging pure iron, chromium metal and electrolytic nickel into a crucible of the vacuum induction furnace; (2) vacuum heating: vacuumizing, and electrifying for heating until the steel and iron materials in the crucible are melted down; (3) degassing: carrying out high-vacuum degassing for 40-80 minutes under the pressure of less than or equal to 1 Pa; (4) deoxidation and alloying: argon is filled to 35000-40000 Pa, and nickel-magnesium alloy is added for deoxidation and desulfurization; after deoxidation is completed, power is cut off for cooling, and when the temperature reaches 1530-1550 DEG C, carbon powder, electrolytic manganese, ferrophosphorus, industrial silicon and the like are added for alloying; and (5) tapping: after the components of molten steel are detected to be qualified, when the temperature is raised to 20-30 DEG C above liquidus temperature of the weathering resistant steel, electrified tapping is carried out at a constant speed, and an ingot mold is a water-cooled copper ingot mold. According to the smelting method of the weathering resistant steel for the direct-reading spectrum standard, relative standard deviation SD% of cast ingot obtained through the method is smaller than or equal to 2%, and accuracy and uniformity are effectively improved.