103results about How to "Reduce the formation temperature" patented technology

The present invention relates to a preparation method of titanium-containing double perovskite type methane combustion catalyst. The process is characterized in that a certain amount of butyl titanate is added into ethanol to produce white sediment; concentrated nitric acid is added until the sediment is totally dissolved and transparent solution is obtained; lanthanum nitrate and magnesium nitrate are weighed and dissolved in the deionized water and a certain amount of dextrose is added, thus completely forming composition solution; then gel is formed by constant-temperature stirring and evaporation; the gel obtained is dried and sintered at the temperature of 500 DEG C, 800 DEG C and 1,100 DEG C in the air for three hours to obtain the catalyst La2MgTiO6. The present invention is characterized in that the Sol-Gel Preparation Method with the dextrose as the complexing agent is adopted and the single-phase double layer perovskite type composite oxide catalyst is prepared at lower temperature. The preparation method is simple and low in cost. The catalyst used in methane catalytic combustion reaction has the characteristics of low initiation temperature and low whole transformation temperature.

The invention discloses spherical ferrate having a hollow structure and a preparation method thereof. The ferrate MFe2O4 is of a hollow-structured spherical particle formed by self-assembling of nanocrystals having a particle size of 10-50nm, wherein M is Co, Ni or Zn, the diameter of the particle is 0.1-1mu m, and the thickness of a shell layer is 30-200nm. The spherical ferrate can be used as a negative electrode material of a lithium ion battery.

The invention relates to an alterant of an iron-rich phase in secondary aluminum and an alteration method. The alterant is composed of a [Mn] agent and a [B] agent. The alteration method includes the steps that part of secondary aluminum is heated to form a melt, then the [Mn] agent is added, the remaining secondary aluminum is added after the [Mn] agent melts, the [B] agent is added, refining is carried out after the [B] agent melts, pouring is carried out after standing is carried out for a period of time, and the secondary aluminum obtained after alteration treatment is obtained. According to the alterant and the alteration method, the Fe element in the iron-rich phase can be replaced through the [Mn] agent, the advantage growth orientation of the iron-rich phase is changed, and therefore a needle-like beta-Fe phase is eliminated; meanwhile, the forming temperature of the iron-rich phase can be reduced through B in the [B] agent, the growth time of a primary iron-rich phase is shortened, the growth space of the primary iron-rich phase is reduced, the B can also serve as a surface-active element, and is absorbed to the surface of the iron-rich phase in the initial phase of formation of the iron-rich phase, and growth of the iron-rich phase is restrained, so that through the combined action of the [Mn] agent and the [B] agent, existence of the needle-like iron-rich phase and the primary iron-rich phase can be completely eliminated, the uniform Chinese character type iron-rich phase is obtained; and in addition, the adding amount of the Mn can be greatly reduced, and the mechanical performance and the machining performance of the secondary aluminum can be greatly improved.

The invention relates to a method for improving the structure and performance of a T92 steel welding joint. By means of a test on deposited metal and the welding joint, the weldability of heat-resistant steel of T/92 steel ferrite is analyzed, the mechanical property of the three kinds of deposited metal different in component and the welding joint is analyzed, comparative study is carried out on the weldability and the weldability of imported welding wires, the influence mechanism of the nickel content and different postweld heat treatment processes and cooling speeds on the structure and the mechanical property of the T/P92 ferrite heat-resistant steel welding joint is analyzed, and control over the preheating temperature, heat input, interlayer temperature and postweld heat treatment process of the T92 steel welding joint and the nickel content are obtained.

The invention provides a green pellet prepared from ferrous raw materials, an adhesive and an additive, wherein the diacidic alkalinity of the green pellet is 0.2-0.4, the ferrous raw materials comprise at least 80 weight percent of hematite and/or sulphuric acid residue. Compared with the prior art, when the pellet is roasted, because the pellet comprises partial CaO, the CaO reacts with Fe2O3 togenerate a calcium ferrite system compound, the roasting temperature of the hematite pellet in a rotary kiln can be reduced to 1280-1330 DEG C, and a ring forming problem cause by overhigh roasting temperature is avoided, therefore, the high-intensity pellet ore can be prepared, and the continuous production can be ensured.

The invention discloses an 800 MPa level hot-rolled threaded steel bar and a production method. The high-strength threaded steel bar is composed of following elements including, by weight percent (%),0.15%-0.25% of C, 1.00%-3.00% of Si+Mn, 0.01%-0.04% of Nb, 0.01%-0.20% of Ti, 0.50%-1.50% of Mo+Cr, 0.001%-0.01% of B, 0.01%-0.20% of Cu and the balance Fe and inevitable impurities. Through adding of Nb, Mo, Cr and B, the bainite forming temperature is reduced, and forming of granular bainite good in tenacity is promoted; the high-temperature heating and low-temperature initial rolling combinedtechnology is adopted, Nb plays an effective solid solution role, dispersed Nb (C and N) nanoscale precipitation is formed in the subsequent rolling and cooling process, and the precipitation strengthening effect is good. A threaded steel microscopic structure produced through the above components and technology is ferrite + bainite, and the lower yield strength is larger than or equal to 800 MPa.

The invention relates to the field of cell freezing liquids, and concretely relates to a cell cryopreservation liquid containing antifreeze proteins. AFP134 proteins are added to the cell cryopreservation liquid in order to effectively improve the cell recovery rate; and the cell cryopreservation liquid contains no DMSO, so the influences of the DMSO on the cytotoxicity are reduced.

The invention discloses a 99BeO ceramic metallizing slurry and a preparation method thereof, belonging to the technical field of electronic material. The 99BeO ceramic metallizing slurry consists of 60-70% of metallizing raw material by mass and 30%-40% of organic adhesive. The metallizing raw material consists of 70-90% of metal W by mass and 10-30% of multi-element metal oxide active agent by mass. The multi-element metal oxide active agent consists of MgO, Al2O3, SiO2 and more than one oxides containing Sm, Nd, Pr or Tb. The preparation method comprises the steps: at first, preparing the multi-element metal oxide active agent with raw materials like MgO, Al2O3, SiO2, etc. by ball milling; then mixing the multi-element metal oxide active agent with metal tungsten powder, followed by ball milling and drying so as to obtain the metallizing raw material; and finally mixing the metallizing raw material with the organic adhesive, followed by vibration milling so as to obtain the metallizing slurry. When the metallizing slurry provided by the method is used to metallize the surface of 99 beryllium oxide ceramic, the sintering temperature of metallization can be lowered, and the metallized layer on the surface of beryllium oxide ceramic devices has higher tensile strength and thermal conductivity; and simultaneously, the preparation method thereof is simple in process, low in cost, excellent in repeatability and suitable for industrial production.

A synthetic method of an aluminium zinc phosphate nanocrystal adopts a direct synthetic method of low-heating solid-state chemical reaction, uses zinc salt powder, aluminium salt powder, and phosphate powder as raw materials, and comprises the following steps: adding a template, mixing and grinding under a condition with room temperature and normal pressure, allowing the reaction mixture to standat a temperature from room temperature to 90 DEG C, washing the reaction mixture with water to remove by products of soluble inorganic salts, filtering, drying the filter cake at 100 DEG C to obtain a product of a zinc phosphate nanocrystal with a microcrystal particle size of 35 nm. Compared with the prior art, the aluminium zinc phosphate product obtained by the method of the invention has better corrosion inhibition performance than traditional zinc phosphate or aluminium phosphate products, and is a antirust material with excellent performance. Additionally, the method has the advantages of no solvent required, mild reaction conditions, easy control, simple process, extensive raw material sources, etc.

The invention discloses a raw material composition capable of being used for preparing MCMB. The composition is a suspension formed by coal tar pitch extracts after dispersed on dimethicone, and the coal tar pitch extracts are insoluble substances obtained by coal tar pitch powder after dissolution and impurity removal by n-hexane or toluene. The preparation method of the raw material composition includes filling the coal tar pitch powder into a Soxhlet extractor, performing repeated extracting, dissolving and impurity removing to obtain the insoluble substances through n-hexane or toluene; and then drying and grinding, and subjecting the substances to ultrasonic dispersion on the dimethicone. The method for preparing the MCMB anode material through the raw material composition includes heating the raw material composition to subject the material to a thermal condensation reaction to form micron-sized spherulite; and then subjecting the solid-liquid mixed phase after the thermal condensation to centrifugation, n-hexane extraction, repeated scrubbing and drying sequentially to obtain the MCMB anode material. The material and the methods are simple in process steps, low in cost and capable of being used for preparing high-quality MCMB.

Different from the scheme that an organic material layer is separately used as a sacrificial layer of an MEMS (Micro-Electro-Mechanical-System) device, the invention adopts the following scheme that after the organic material layer is patterned, a covering layer with the decomposition temperature higher than that of the organic material layer covers the surface of the patterned organic material layer, so that a subsequent deposited structural material layer is isolated from the organic material layer to play a role of preventing a machine cavity from being polluted due to the decomposition and escape of the organic material layer in the high-temperature deposition process. In addition, the covering layer provides a larger material selection range for the organic material layer. Based on the sacrificial layer, the invention also provides the MEMS device comprising the sacrificial layer and a manufacturing method of the MEMS device.

The atomic-layer pulse deposition preparation method for high-density nano-Ru crystal comprises: heat growing SiO2 layer or film with high dielectric constant on the Si surface, depositing 2-5nm Ru film with atomic-layer pulse deposition, and fast annealing at high temperature. This invention is compatible to CMOS technique, and operates simply.

The invention discloses preparation and application of a whisker-shaped ceramic membrane with low cost and high permeability, and belongs to the technical field of preparation of high-permeability membranes. According to the method, tungsten oxide is added to form thewhisker-shaped ceramic membrane; the ceramic membranehas lower mullite forming temperature, and the sintering cost is greatly reduced; higher porosity, higher mechanical strength and better mechanical strength are achieved, and the permeability is improved; and the surface is rougher, so that the wettability of the membrane is effectively enhanced, and the membrane has higher oil pollution resistance in the oil-water separation process. In the preparation process, a phase inversion method or an extrusion molding method is adopted, so that hollow fibrous, tubular or hollow flat-plate-shaped and large-size tubular or flat-plate-shaped whisker structure mullite ceramic membranes can be respectively obtained, and can be used for large-scale industrial application. The whisker-shaped mullite ceramic membrane shows stable high permeation flux and high oil retention rate for oil-water separation (such as high-concentration and high-acid-base environments and complex oily wastewater), and has a wide application prospect.

The invention discloses a method and system for reducing reduction degradation of vanadium-titanium magnet pellets. The method for reducing reduction degradation of the vanadium-titanium magnet pellets includes the following steps that firstly, vanadium-titanium magnetite is ground to be fine, and vanadium-titanium magnetite powder is obtained; secondly, the vanadium-titanium magnetite powder is mixed with bentonite, and a mixture is obtained; thirdly, the mixture is pelletized, and green pellets are obtained, wherein a boric acid water solution is added in the pelletizing process to serve as water for pellet pelletizing; and fourthly, the green pellets are roasted, and the vanadium-titanium magnet pellets are obtained. The invention further discloses a system implementing the method, and the system includes a fine grinding device, a material mixing device, a pelletizing device and a roasting device. According to the method and the device, in the pelletizing process, the boric acid water solution is evenly sprayed into the green pellets, the reduction degradation rate of the vanadium-titanium magnet pellets is effectively reduced, and the metallurgical performance in the pellet smelting reduction process is improved.

The invention discloses a heat-resistant regeneration die-cast aluminum alloy and a preparation method thereof, and belongs to the field of regeneration die-cast aluminum alloy preparation. The invention provides the heat-resistant regeneration die-cast aluminum alloy capable of reducing the preparation cost and the preparation method of the heat-resistant regeneration die-cast aluminum alloy. Chemical components of the heat-resistant regeneration die-cast aluminum alloy include 10.0%-12.0% of Si, 0.50%-0.75% of Ni, 0.95%-1.35% of Mg, 0.9%-1.4% of Fe, 0.20%-0.30% of Mn, 0.08%-0.12% of Cr, 0.015%-0.03% of B, smaller than or equal to 0.15% of an impurity element and the balance Al. The preparation method includes the steps that smelting is conducted; sampling is conducted to adjust the alloycomponents; refining is conducted after low-melting-point alloy addition; slag removal is conducted; and casting is conducted. According to the heat-resistant regeneration die-cast aluminum alloy andthe preparation method, Ni and Cu are replaced with the low-cost impurity element Fe, and the alloy cost is effectively reduced; and by means of the compound modification technology of the Mn, the Cr, the B and the like, the size of the iron-rich phase is refined, and the high-temperature strength of the alloy is ensured.

The invention belongs to the field of chemistry and particularly relates to a preparation method for expanded graphite. The method comprises the following steps: taking sulfate, phosphate or nitrate as an electrolyte solution, taking a simulated spent fuel ball as an anode, and taking an inert electrode as a cathode; performing electrolysis under a condition that the current is 25-70 A. Collected graphite particles have the specific surface area being 20-50 m<2>/g and the expansion volume of 20-70 mL/g. Due to the adoption of electrochemical intercalation and oxidation coupling methods, graphite oxide containing various free radical groups is easily formed under the action of high current, and graphite particles are refined, so that the formation temperature of the expanded graphite is reduced, energy resources are saved, the breakage rate of a simulated fuel core is reduced, reutilization of a large amount of matrix graphite is improved, and disposal space of high-level wastes is reduced.

The invention relates to a preparation method of an MAX-phase coating. The preparation method comprises the following steps: providing a substrate; depositing an M-A-X coating on the surface of the substrate by combining a cathode arc ion plating method with a magnetron sputtering method, wherein an M source is provided by a cathode arc target, M in the M source stands for a transition metal element, an A source is provided by a magnetron sputtering target, A in the A source stands for an Al element or a Si element, an X source is provided by a reaction gas, and X in the X source stands for aC element or a N element; and carrying out annealing treatment on the substrate with the deposited M-A-X coating, so as to obtain the MAX-phase coating. According to the preparation method provided bythe invention, an M-element-rich coating and an A-element-rich coating are alternately formed by combining the cathode arc ion plating method with the magnetron sputtering method; M atoms in the M-element-rich coating are of a close-packed hexagonal structure; C atoms or N atoms are dissolved in the close-packed hexagonal structure; the prepared MAX-phase coating has a similar crystal structure with a conventional MAX-phase coating; and consequently, the MAX phase forming temperature can be lowered during the annealing process, and then the damage to the substrate can be reduced.

The invention discloses a method for preparing anorthite toughened ceramic by utilizing desulfurized gypsum. The method comprises the following steps of: uniformly mixing 5wt%-30wt% of desulfurized gypsum and 70wt%-95wt% of ceramic blank in a wet-process ball milling manner, wherein the desulfurized gypsum is calcium sulfate type flue gas desulfurization waste residue; grinding and drying the slurry, and preparing the ceramic green blank by dry-pressing and forming; sintering the ceramic green blank in a kiln, controlling the sintering temperature at 1180 -1260 DEG C, and preserving the heat for 30-90 minutes to prepare the anorthite toughened ceramic. The ceramic test sample which is prepared from the method disclosed by the invention adopts anorthite and mullite as the principal crystalline phase, and adopts cristobalite as the secondary crystalline phase, so that the crystalline phase structure is matched with the thermal expansion coefficient of the feldspathic glass which is used as the binding phase better, and therefore, the micro cracks generated in a ceramic sintering process can be reduced, and the impact strength of the ceramic product is improved. Besides, the method can be used for achieving the purposes of utilizing the waste, saving the ceramic production energy consumption and improving the product performance.