76results about How to "Single phase" patented technology

The invention relates to a preparation method of a lightweight graphite-based nano-magnetic metal composite material used for electromagnetic shielding, which belongs to the related field of electromagnetic shielding materials; the precursor solution of expanded graphite and magnetic metal is mixed and stirred evenly, and dried after evaporating the solvent. The obtained mixture is treated in a reducing atmosphere at 300°C-1000°C, passivated with ordinary nitrogen and cooled to room temperature to obtain a composite material of expanded graphite and magnetic nanometer metal, and the relative content of the two can be adjusted. The composite material is light in texture, has excellent electromagnetic properties, and can be pressed into various shapes required. The material has excellent electromagnetic shielding performance in the range of 300kHz-1.5GHz, reaching 70-105dB, and the addition of magnetic metal improves the electromagnetic shielding performance of the expanded graphite in the low-frequency band. The method is simple and efficient, suitable for mass preparation, and the obtained product is expected to be applied in aerospace, military, electronic and electrical products.

The invention discloses a method for synthesizing ferrous sulfide material, which adopts green vitriol and carbon powder as raw materials that are evenly mixed and then synthesized by high-temperature solid-phase reaction under the protection of inert gases to obtain the product of the invention. The obtained ferrous sulfide powder by adopting the method of the invention has high purity, single phase, simple preparation conditions and low cost, which can be synthesized in batch.

The invention provides a preparation method of lithium phosphate. The method comprises the following steps: (1) introducing carbon dioxide into water, adding industrial level lithium carbonate, further adding a precipitating agent, continuously introducing the carbon dioxide till the pH value of solution is 8-9, filtering and collecting lithium bicarbonate solution, wherein the raw material lithium carbonate is the industrial level lithium carbonate; (2) adding phosphoric acid into the lithium bicarbonate solution in the step (1) till the pH value of the solution is 6-6.5, heating to 65-70 DEG C, stirring, using ammonia water to regulate the pH value of the solution to 8-8.5, and then carrying out solid-liquid separation at the temperature of 90-95 DEG C, thus obtaining a lithium phosphate wet material; and (3) carrying out vacuum drying on the lithium phosphate wet material, thus obtaining the product. By utilizing the preparation method, the shortcomings of the traditional production process can be solved, the process is simple, the material phase is single, the preparation method ensures not to introduce a large number of other impurity elements, hydrochloric acid is not used during the process, special anti-corrosion treatment does not need to be carried out on reaction equipment, the environment is not influenced basically, and the yield of the process can be more than 97%.

The invention discloses a method for synthesizing a cobalt diselenide nanocrystal in a polyalcohol-base solution, which comprises the following steps: (1) weighing 0.25mmol of cobalt chloride, and dissolving in 10ml of triethylene glycol to obtain a cobalt precursor cation source solution; adding 40ml of triethylene glycol into a three-neck flask, adding selenium powder, and adding 0.1g of polyvinylpyrrolidone to obtain an anion source solution, wherein the Co/Se mol ratio is respectively 1:2, 1:1.9, 1:1.8, 1:1.7, 1:1.5 and 1:1; and (2) slowly heating the anion solution to 210-270 DEG C while quickly injecting the cation source solution, and reacting under reflux to synthesize the CoSe2 nanocrystal solution. The method has the advantages of mild reaction conditions, high safety, low toxicity, low cost, single and stable product phase and favorable repetitiveness, and is simple to operate; and the stoichiometric proportion and material feeding have favorable consistency.

The invention relates to a preparation method of submicron-level vanadium trioxide powder. The preparation method comprises 1, preparing an oxalic acid solution, 2, heating the oxalic acid solution, adding vanadium pentoxide powder into the oxalic acid solution, and carrying out a stirring reaction process until complete dissolution to obtain a vanadyl oxalate solution, 3, slowly adding ammonium hydroxide into the vanadyl oxalate solution and carrying out stirring for a reaction to obtain precipitates, 4, filtering the precipitates and carrying out drying to obtain a high-activity precursor and 5, roasting the high-activity precursor in an inert atmosphere to obtain submicron-level vanadium trioxide powder. The submicron-level vanadium trioxide powder has high product purity and a single phase, contains submicron-level spherical particles with the uniform sizes less than 1 microns and high particle surface activity and is conducive to further processing and use. The preparation method has simple processes, can be operated easily, has a low cost, is free of hydrogen or other reducing atmospheres, has high safety and a low three waste treating capacity and can be easily industrialized.

The invention discloses a preparation method of a high-entropy ceramic material with good light absorption performance, the preparation method comprises the following steps: taking any five of CuO, MnO2, Fe2O3, Cr2O3, Co3O4, TiO2, ZnO and MgO powder as raw materials, carrying out ball-milling mixing, drying and grinding, then carrying out high-temperature calcination in an air atmosphere, and then cooling and grinding to obtain high-entropy ceramic with a spinel structure. The high-entropy ceramic is prepared by combining a mechanical wet grinding method and a solid-phase synthesis method, metal elements can be sufficiently and uniformly mixed, the method has the advantages of simple preparation technology, high repeatability, high production efficiency, suitability for industrial production and the like, and the prepared high-entropy ceramic is single in phase, high in purity, small in particle size and uniform in element distribution, the material has high solar energy absorptivity and good thermal stability, and can ensure the photo-thermal conversion efficiency of a solar energy absorbing material as a solar energy absorbent.

The invention discloses a method for synthesizing a nickel diselenide nanocrystal in a polyalcohol-base solution, which comprises the following steps: (1) weighing 0.25mmol of nickel nitrate hexahydrate, and dissolving in 10ml of triethylene glycol to obtain a nickel precursor cation source solution; adding 40ml of triethylene glycol into a three-neck round-bottom flask, adding selenium powder, and adding 0.1g of polyvinylpyrrolidone to obtain an anion source solution, wherein the Ni/Se mol ratio is respectively 1:2, 1:1.9, 1:1.8 and 1:1.7; and (2) slowly heating the anion solution to 210-270 DEG C while quickly injecting the cation source solution, and reacting under reflux to synthesize the NiSe2 nanocrystal solution. The method has the advantages mild whole reaction conditions, high safety, low toxicity, low cost, single and stable product phase and favorable repetitiveness, and is simple to operate, and the stoichiometric proportion and material feeding have favorable consistency.

The invention discloses a simple preparation method of an aluminate electron-emission substance for a hot cathode, and belongs to the technical field of preparation of the electron-emission materialsfor the hot cathodes. The preparation method comprises the following steps: taking Ba(NO3)2, Ca(NO3)2.4H2O and Al(NO3)3.9H2O as raw materials and taking EDTA (Ethylene Diamine Tetraacetic Acid) as a complexing agent to prepare precursor powder of salt by a sol-gel method; roasting the precursor powder to obtain final aluminate, wherein after the cathode is fully activated, the pulse emission current density under 950 DEG C b can reach 100A/cm<2> or above and emission slope reaches 1.4 or above. The aluminate prepared by the method has the advantages of simple preparation process, uniform components, single phase, low melting point, good emission performance and the like and is expected to be used in the fields such as microwave vacuum electronic devices.

The invention discloses a corrosion-resistant high-strength neutron shielding alloy material which is composed of the following elements including, by mass, 49%-51% of Hf and the balance Zr and inevitable impurities. The invention also provides a preparation method of the corrosion-resistant high-strength neutron shielding alloy material. The method comprises the following steps of mixing sponge zirconium and sponge hafnium, conducting pressing and vacuum consumable electrode smelting to obtain an alloy cast ingot, sequentially machining and chamfering the alloy cast ingot, carrying out three-heating-number forging to obtain a forged alloy ingot, carrying out heat treatment on the forged alloy ingot, and cooling to obtain the alloy material. According to the corrosion-resistant high-strength neutron shielding alloy material and the preparation method, the Zr serves as a matrix, the Hf serves as a main alloy element, the alloy material is prepared through vacuum consumable electrode smelting and three-heating-number forging, and the prepared alloy material is single in phase and uniform in structure, has excellent neutron shielding performance and strength and meanwhile has extremely high corrosion resistance and machinable performance.

The invention provides solid solution type (Ti, Mo, Ta, Me) (C, N) nanopowder and a preparing method thereof, and relates to the technical field of composite materials. The preparing method comprises the following steps that oxide of each element serves as a raw material, and carbon black serves as a reducing agent and a carbonization agent; then water or alcohol serve as a ball-milling medium, and a slurry is obtained after ball-milling for 1-4h under the condition of 200-300 r/min; a mixture is obtained after the slurry is dried and granulated; finally, the mixture is transferred to a vacuum reaction device, and the final reaction temperature is raised to 1350-1500 DEG C by a programmed temperature raising system; and the solid solution type nanopowder is obtained after reacting in an N2 atmosphere for 2.5-4h. The obtained solid solution type nanopowder is a single phase with the particle size of 150-300 nm. Through regulating for various parameters and controlling for the process, solid solution of an obtained product is complete, the particle size reaches the nano level, the production cost is low, the process is simple, and the solid solution type (Ti, Mo, Ta, Me) (C, N) nanopowder and the preparing method thereof are suitable for industrialized scale production.

The invention discloses a garnet type solid solution magnetic dielectric functional medium ceramic material and a preparation method thereof. garnet type ferrite ceramic Y3Fe5O12 and garnet type microwave dielectric ceramic Ca3LiMgV3O12 are used as the raw materials, the raw material ratio of ferrite-microwave dielectric ceramic is adjusted to synthesize a solid solution at one time, and a seriesof magnetic dielectric functional medium ceramic materials with magnetic properties, excellent dielectric properties and microwave properties can be obtained, and the specific structural expression general formula is: xY3Fe5O12-(1-x)Ca3LiMgV3O12, wherein x is greater than or equal to 0.01 and smaller than or equal to 0.99. Moreover, the ceramic material provided by the invention has a sintering temperature of 1000-1450DEG C, and has the characteristics of simple chemical composition and preparation process, and single phase.

The invention discloses a preparation method of a water-based nano magnetic fluid. The method comprises the following steps of: dissolving ferrous salt and ferric salt in an acidic solution to preparea ferric salt mixed solution, and marking the ferric salt mixed solution as a feed liquid A; dissolving an alkali source in deionized water to prepare alkali liquor, and marking the alkali liquor asfeed liquid B; under the reaction condition of introducing inert gas N2, mixing the feed liquid B with the feed liquid A, heating the mixed solution in a water bath, and performing stirring to carry out a full reaction; adding a surfactant, heating an obtained mixed solution in a water bath, performing stirring, generating black precipitated nano ferroferric oxide particles after finishing the reaction, continuously introducing N2, and cooling to room temperature; collecting the black precipitates, and carrying out centrifugal washing by using a mixed solution of an organic solvent and water;and dispersing the precipitates in deionized water, removing the organic solvent, and carrying out ultrasonic dispersion to obtain the water-based nano magnetic fluid. The water-based magnetic fluid product is uniform in size, and the average particle size of the product is 5-25 nm; the water-based magnetic fluid product is good in dispersion, single in phase and good in stability; and stable dispersion of the product for more than or equal to 6 months can be realized after the product is modified.

The invention provides a microwave-assisted method for compounding gangue and acetylene sludge into a xonotlite fiber. The method comprises the following steps: (1) mixing acetylene sludge with water, thereby preparing a calcium pulp; (2) alkalizing, calcining and activating gangue, uniformly mixing the activated product with water and then filtering, thereby obtaining a refined siliceous solution; (3) uniformly mixing the calcium pulp, the refined siliceous solution and a sodium hydroxide solution and performing microwave heating synthetic reaction; (4) after completing reacting, filtering a mixed slurry, thereby obtaining a filter cake and aqueous alkali; (5) washing the filter cake and drying, thereby obtaining the xonotlite fiber, and then recycling the filter cake washing effluent and the aqueous alkali into the sodium hydroxide solution. Compared with the existing compounding method, the method has the advantages of low reaction temperature, short time, simple process and mild condition; the obtained xonotlite fiber is high in purity; the phase is single and impurity-free; the degree of crystallinity is high; the performance can fully meet and even exceed the standard for light calcium silicate thermal insulation materials.

The invention provides a preparation method of a dispersed fluffy MB6 nano low-heat-transfer powder material. The preparation method comprises the following steps: step 1, grinding metal M cations and a boron source to obtain an MB6 precursor; 2, the MB6 precursor is loaded into a rotary furnace to be calcined, hydrogen and nitrogen mixed gas is introduced into the rotary furnace, the temperature is increased to 850-1200 DEG C, heat preservation is conducted for 30-450 min, and a head product is obtained after cooling; and step 3, removing impurities from the primary product to obtain the dispersed and fluffy MB6 nano low-heat-transfer powder material. The powder material disclosed by the invention is loose and fluffy in powder, small in particle size, relatively low in required temperature, low in energy consumption, low in cost of required raw materials, simple in batch preparation and suitable for large-scale industrial production.

The invention belongs to the technical field of metastable crystal materials and particularly relates to p-CuSe2 (pyrite CuSe2) and a preparation method thereof. According to the preparation method ofp-CuSe2, CuCl is used as a Cu source, triethylene glycol is used as a solvent and a reducing agent, CuCl and triethylene glycol are mixed, and a cationic precursor solution is obtained. Glucose is used as an auxiliary reducing agent and matched with triethylene glycol, Se powder is reduced to Se2<2-> under the action of polyvinylpyrrolidone, an anionic precursor solution is obtained, auxiliary reducing agents with higher toxicity are avoided, the glucose has proper reducibility and cannot produce Se<2-> and other impure phases due to too high reducibility, and product purity can be improved.The cationic precursor solution and the anionic precursor solution are mixed to be subjected to a replacement reaction, and the p-CuSe2 with single and stable phase is obtained.

The invention discloses an application and a preparation method for a molybdenum-based low temperature sintering microwave dielectric ceramic material, and belongs to the technical field of electronic ceramics and manufacturing techniques thereof. According to the preparation method, a composition expression of the ceramic material is (1-x)Bi2O3-(x)Ln2O3-MoO3, wherein the Ln is equal to La or Nd, and each x is equal to or greater than 0.001 and equal to or smaller than 0.3; the ceramic material can be prepared into a ceramic by sintering at the temperature range of 800-1000 DEG C, has excellent microwave dielectric properties, and can be used as a microwave dielectric material. The ceramic material has the following advantages: 1, adjustable dielectric constant (Epsilonr is equal to or greater than 21 and equal to or smaller than 31); 2, high quality factor (Qf is equal to 20, 300-32, 300 GHz); 3, low sintering temperature (800-1000 DEG C); 4, simple preparation technology; 5, wide application range.