51results about How to "Increase lattice defects" patented technology

The invention discloses a synthetic method for high-activity N-F co-doped bismuth vanadate visible light photocatalytic material prepared through the citric acid complexation sol-gel method and a preparation process. The method employs Bi(NO3)3.5H2O(97%) and NH4VO3(98.5%) as source materials, citric acid(99.5%) as a chelating agent, NH4F as N and F sources, and utilizes ammonium hydroxide to regulate the pH value, and dark blue sol is prepared, dried, calcined to obtain the N-F co-doped bismuth vanadate photocatalytic material. When the material is compared to bismuth vanadate without being doped, because of the synergistic effects of N and F, oxygen vacancies and V4+ with catalytic activity are increased N-F co-doped bismuth vanadate crystals, the band-gap energy is narrower and the photocatalytic activity is raised obviously in visible light. The method is advantaged by simple process, mild conditions and good repeatability. The photocatalytic material can be widely used in photocatalytic degradation of organic pollutants, and has wide application prospects in environmental governance.

The invention relates to preparation methods of lanthanum-doped cobalt nickel ferrite gas-sensitive powder and a gas sensor. The preparation method of the gas-sensitive powder comprises the following steps: (1) soluble cobalt salt, nickel salt, lanthanum salt and ferric salt are mixed and dispersed into ethylene glycol, and sodium acetate anhydrous is added and stirred to form reaction solution; and (2) the reaction solution is heated and reacted, then is cooled to room temperature after the reaction, and washed, centrifugated and dried. The preparation method of the gas sensor comprises the following steps: the gas-sensitive powder and terpilenol solution of ethyl cellulose are mixed and ground to form gas-sensitive slurry; and then the gas-sensitive slurry is uniformly coated to an Al2O3 ceramic tube with an Au electrode, conducted to gas drying and calcination, and installed on a testing base, and then the gas sensor is obtained after ageing. The preparation methods are simple, the requirement on the production equipment is low, the industrial production is easy, and the prepared gas-sensitive powder has good selectivity, good chemical stability and good sensitivity.

The invention belongs to the field of novel chemical materials and especially relates to a lanthanum cobaltate/attapulgite/reduced graphene oxide nano-structure composite material, a preparation method, and an application thereof. The preparation method includes the steps of: 1) preparing lanthanum cobaltate/attapulgite through a sol-gel process, adding the lanthanum cobaltate/attapulgite to deionized water and acidifying the liquid and regulating pH value to obtain a lanthanum cobaltate/attapulgite water solution carrying positive charges; 2) reducing graphite oxide with hydrazine hydrate to produce reduced graphene oxide carrying negative charges, and mixing the reduced graphene oxide with the lanthanum cobaltate/attapulgite water solution, stirring the mixture in water bath, performing a reaction, and drying a reaction product to obtain a perovskite/attapulgite/reduced graphene oxide composite material. With the composite material as a catalyst for performing photo-SCR denitration, conversion rate on NOx in a low-temperature zone (100-200 DEG C) can reach more than 95%.

The invention discloses a crystalline Li3OCl inorganic lithium ion conductor as well as a preparation method and an application thereof. The Li3OCl inorganic lithium ion conductor is Zn-doped Li3OCl,and the preparation method comprises the following steps: uniformly mixing lithium hydroxide, lithium oxide and lithium chloride in proportion, and melting above the eutectic point of lithium hydroxide, lithium oxide and lithium chloride to obtain a precursor; and mixing the precursor with metal zinc powder, and carrying out heat treatment at a temperature higher than the melting temperature of the precursor in a protective atmosphere to obtain the product Zn-doped Li3OCl. The Li3OCl inorganic lithium ion conductor provided by the invention has excellent lithium ion conductivity and environmental stability. The preparation method provided by the invention is short in preparation period, low in cost, high in process controllability and suitable for industrial application.

The invention belongs to the field of refractory materials, and particularly relates to a method for synthesizing aluminum-rich spinel through a low-temperature solid-phase reaction. The method specifically comprises the following steps: firstly, mixing 80-90 parts by weight of an aluminum oxide raw material, 10-20 parts by weight of a magnesium oxide raw material, 0.5-2 part by weight of magnesium aluminate spinel micro powder and 0.5-3 part by weight of an additive, and co-grinding the materials until the particle size of the raw materials is in a range of 5-20 microns; transferring the co-ground powder into a high-temperature kiln, heating to 1000-1500 DEG C, and calcining; and finally, keeping for 3-12 hours at the calcining temperature, and implementing naturally cooling or quickly air-cooling to room temperature to obtain the aluminum-rich spinel. A low-temperature synthesis process is adopted, the aluminum-rich spinel synthesized through low-temperature calcination is fine in grain and high in lattice defect degree, and meanwhile the prepared aluminum-rich spinel powder is high in activity. The prepared aluminum-rich spinel does not contain beta aluminum oxide or impurity phases such as free magnesium oxide, and the content of aluminum oxide in the aluminum-rich spinel reaches 80-90%. When the prepared aluminum-rich spinel powder is used in a corundum spinel castable, the aluminum-rich spinel powder has the advantages of high sintering strength and strong slag penetration resistance.

The invention provides a technology for accelerating a solid solution speed of indissolvable delta ferrite in a martensite heat-resistant steel ingot in a structure after high-temperature long-time solid solution and refining austenite grains; and the technology for generating a lot of lattice defects in delta ferrite by using lower-temperature (below steel austenite grain roughening temperature) austenitizing and deformation accelerates the solid solution speed of the delta ferrite in the martensite heat-resistant steel ingot after high-temperature long-time solid solution, and meanwhile, obtains fine austenite grains. The martensite heat-resistant steel ingot is cooled to reach the room temperature after high-temperature solid solution of 1180-1200 DEG C by 8-10 h, and then, are heated for austenitizing of 1000-1050 DEG C; and the compression deformation of above 60% is performed, so that the solid solution speed of the delta ferrite is accelerated, and meanwhile, the fine austenite grains are obtained. The technology has the following advantages: the solid solution speed of the indissolvable delta ferrite in the martensite heat-resistant steel ingot in the structure after high-temperature long-time solid solution can be greatly accelerated; meanwhile, the austenite grains are refined; and the steps are simple.

The invention relates to a lanthanum-yttrium-codoped nano-titanium dioxide gas-sensitive material as well as a preparation method and an application thereof. The material is prepared by the steps of: by taking nano-titanium dioxide as a matrix and the amount of titanium substances as a base number, doping 0.1-0.8 mol% of lanthanum and 0.1-0.8 mol% of yttrium, dripping ethanol solution of tetrabutyl titanate into the ethanol solution of lanthanum nitrate and yttrium nitrate by utilizing a sol-gel method to prepare sol, and drying, grinding and roasting the sol. The grain diameter of the obtained lanthanum-yttrium-codoped nano-titanium dioxide is 35-70 nm. The invention further provides the preparation method of the material. The obtained gas-sensitive material is used for producing gas-sensitive sensors for detecting o-chlorophenol, is high in sensitivity, good in selectivity and short in response time and is beneficial for realizing fast detection of the o-chlorophenol.

The invention provides a carbonized fiber paperboard loaded Mo2C/NC catalyst as well as a preparation method and application thereof. The method for preparing the carbonized fiber paperboard loaded Mo2C/NC catalyst comprises the following steps: dissolving a molybdenum source and a nitrogen source in a solvent to obtain an impregnation liquid, impregnating afiber paperboard with the impregnation liquid, and then drying and carbonizing the fiber paperboard impregnated with the impregnation liquid to obtain a carbonized fiber paperboard loaded molybdenum carbide catalyst. According to the methodfor preparing thecarbonized fiber paperboard loaded Mo2C/NC catalyst, the fiber paperboard is used as a substrate (carbon source); dipping of the molybdenum source and thenitrogen source on the fiberpaperboard is carried out; after high-temperature carbonization, Mo2C nanosheets are formed on the fiber paperboard in situ and dispersed in a nitrogen-doped carbon matrix to form a nano composite structure; by doping nitrogen, the dispersity of molybdenum carbide on a carbon material is improved, the fiber paperboard has good conductivity after being carbonized, electron transfer between the catalyst and an electrode is promoted, the catalyst has high electro-catalytic performance, and the fiber paperboard is wide in source and low in price.

The invention relates to an electric arc spraying method. The electric arc spraying method comprises the following steps that S1, construction preparation is conducted; S2, pretreatment is conducted on the surface to be sprayed, specifically, sand blasting treatment is conducted on the surface of a workpiece through pneumatically-controlled sand blasting equipment, and the roughness of the workpiece reaches 90-120 microns; S3, pretreatment is conducted on a metal wire, specifically, the metal wire is cleaned through a rust remover, straightened through a straightening machine after being cleaned and dried, and polished after being straightened, so that the surface of the metal wire is smooth; S4, electric arc spraying is conducted; S5, coating hole sealing is conducted; and S6, coating inspection is conducted, specifically, the appearance surface obtained after spraying is inspected. According to the electric arc spraying method, the metal wire is cleaned, dried, straightened and polished before spraying, so that the outer surface of the workpiece obtained after spraying is smooth, a coating is uniform, flat and compact, the coating and a base body are well combined, bubbling, cracking, pitted surfaces and peeling are avoided, and accordingly the corrosion resistance and structural strength of the workpiece are improved.

The invention discloses a preparation method of a high-performance nano W0.4Mo0.6O3 photocatalyst. The preparation method comprises the following steps: uniformly mixing a C6H12O6.H2O aqueous solution, a Na2WO4.2H2O aqueous solution and a Na2MoO4.2H2O aqueous solution to obtain a solution mixture, adding a polyoxyethylene alcohol ether aqueous solution into the solution mixture, uniformly stirring, regulating the pH value to 1-2, performing hydrothermal reaction at 120-180 DEG C for 5-15 hours, performing aftertreatment to obtain powder, and removing carbon from the powder, thereby obtaining the high-performance nano W0.4Mo0.6O3 photocatalyst. The nano W0.4Mo0.6O3 photocatalyst has a nano granule structure, and has large specific surface area, so that the contact area between the photocatalyst and organic dye is enlarged, and photo-catalytic reaction is facilitated. The preparation method is simple and convenient, and is easy to implement.

The invention provides a hard-shaft heavy-load silicon single crystal lifting device, which comprises a support structure; a single crystal bearing outer hard shaft, wherein a single crystal claw is mounted at the bottom of the single crystal bearing outer hard shaft; a seed crystal bearing inner hard shaft, wherein a seed crystal chuck is mounted at the bottom of the seed crystal bearing inner hard shaft; a rotary driving device used for driving the single crystal bearing outer hard shaft to rotate; an outer hard shaft lifting device used for driving the single crystal bearing outer hard shaft to lift; and an inner hard shaft lifting device used for driving the seed crystal bearing inner hard shaft to lift. Synchronous rotating motion of the inner hard shaft and the outer hard shaft, independent lifting motion of the outer hard shaft and independent lifting motion of the inner hard shaft are achieved; the device has high strength and rigidity, can bear single crystals with the weightof 500 Kg or above, makes up the defect of insufficient bearing capacity of the flexible shaft lifting device, avoids the phenomena of flexible shaft swinging and simple pendulum resonance in the flexible shaft lifting device, and can overcome crystal disturbance caused by thermal field symmetry deviation, airflow excitation acting force symmetry deviation and the like.

The invention discloses a method for improving the gelling activity of ardealite. The method comprises the following steps: (1) ageing phosphogypsum with water to obtain aged phosphogypsum; (2) carrying out wet grinding on the aged phosphogypsum to obtain wet-ground phosphogypsum; (3) roasting the wet-ground phosphogypsum, and cooling to obtain roasted phosphogypsum; and (4) respectively carryingout two-stage dump leaching on the roasted ardealite by using a medicament 1 and a medicament 2 to obtain the ardealite with improved gelling activity. The method has the advantages that the process is simple, the cost is low, the gelling activity of the phosphogypsum can be greatly improved, a building material prepared from the treated phosphogypsum is high in strength and strong in water leaching resistance, the doping amount can be larger than 70%, and a way is provided for large-scale use and comprehensive utilization of the phosphogypsum.

The invention discloses fireproof inorganic quartz stone and a preparation method thereof. According to the preparation method, the raw materials are lightly sintered and sintered, so that a part of physical and chemical reactions of the raw materials can be completed, cremation of ore is realized, lattice defects are increased, sintering is promoted effectively, therefore, the preparation efficiency can be effectively improved; a double-sided hot-pressing mode is adopted for extrusion molding to obtain a green body, so that the green body is compact in structure, high in strength and small indrying and firing shrinkage, the size is easy to control, the layer density phenomenon of the green body can be effectively reduced, the total porosity of the green body is reduced, the fireproof performance can be effectively improved, and the using efficiency is increased; a plurality of times of extrusion is adopted, and extrusion time is prolonged, so that gas in the green body can be effectively and smoothly exhausted, the elasticity of the green body can be effectively improved, the strength of the green body can be effectively improved, the green body can be effectively prevented fromcracking, and the preparation efficiency of the green body can be effectively improved.

The invention relates to a preparation method of a ferrous sulfide/attapulgite composite and belongs to the field of utilization of nonmetal mineral materials. The preparation method comprises the steps as follows: a certain amount of ferric nitrate, thioacetamide and attapulgite are weighed and added to deionized water for ultrasonic treatment and stirring, a mixed liquid is transferred to a reaction kettle to react at the temperature of 160-220 DEG C, water washing and alcohol washing are performed after the reaction, drying is performed, and the ferrous sulfide/attapulgite composite can beobtained. The prepared ferrous sulfide/attapulgite composite is uniform in loading and good in dispersity, experimental raw materials are easy to obtain, no complicated equipment is required, and theferrous sulfide/attapulgite composite has a good low-temperature conversion effect on nitrogen oxide under the assistance of light.