52results about How to "Raise the phase transition temperature" patented technology

The invention belongs to the field of material science and engineering and relates to a special flux-cored wire for carrying out preheating-free and heat treatment-free surfacing repair and reproducing on shaft and gear parts. The special flux-cored wire comprises the following chemical compositions in percentage by weight: 5 to 10 percent of fluorite, 20 to 40 percent of high-carbon ferrochrome, 5 to 10 percent of high carbon ferromanganese, 5 to 10 percent of ferrosilicon, 5 to 10 percent of ferromolybdenum, 10 to 15 percent of rare earth oxide, 15 to 20 percent of metallic nickel, 2 to 5 percent of ferrovanadium, 2 to 5 percent of ferrocolumbium, 2 to 5 percent of ferrotitanium, 0.1 to 0.5 percent of graphite, 5 to 15 percent of iron powder, 0.5 to 2 percent of nitride and 1 to 3 percent of aluminum magnesium alloy. A sheath of the special flux-cored wire is a low-carbon steel strip. The special flux-cored wire can be suitable for open arc welding or submerged arc welding. The series flux-core wire for surfacing can carry out surfacing repair and reproducing on the shaft and gear parts under the conditions that preheating is free before surfacing and heat treatment is free after surfacing. The surfacing metal has high crack resistance. The performance of the repaired parts is equal to or even superior to that of the original parts. The special flux-cored wire is convenient to use on site. The hardness range is between HRC20 and HRC45. The service life of the repaired parts is about 3 times longer than that of the original parts.

The invention belongs to the field of thin film solar cells and relates to a perovskite-based inverted thin film solar cell and a preparation method thereof. The inverted thin film solar cell is based on an inverted planar structure, uses a FAPbI3 perovskite system as a light absorption layer, and is prepared by a solution method under a low temperature condition. The inverted thin film solar cell uses the novel FAPbI3 perovskite system as the light absorption layer. Compared with a conventional MAPbI3 perovskite system, the FAPbI3 perovskite system has a wider absorption range, higher phase inversion temperature, and better stability, prevents a high-temperature sintering defect in a conventional inverted structure, and may greatly decrease cost in industrialized production. The preparation method of theinverted thin film solar cell is simple, low in cost, good in repeatability, achieves a low-cost reel-to-reel mode, and has potential application value in the future industrialized production.

The invention relates to a vessel plug material used in intervene treatment. Wherein, said material is temperature-sensitive nanometer gel system based on polymer N-isopropyl acrylamide (PNIPAAm), which comprises polymer N-isopropyl acrylamide nanometer gel and dispersed medium, while the gel mass percentages is 3-20% and the particle diameter of temperature-sensitive nanometer gel is 50-1000nm. The inventive temperature-sensitive nanometer gel system also can contain developer, soluble antineoplastic. The invention can control the polymer monomer kinds and ratios, the crosslinker amount and the density of temperature-sensitive nanometer gel, to control the sol-gel transformation temperature of said system, and the inventive product has better external flow property and high sol-gel transformation speed, to be used to treat vessel plug, etc.

The invention relates to a manufacturing method of a medium-carbon CrMo steel wire rod free of annealing and drawing, and belongs to the field of wire rod production. Raw materials are prepared and smelted according to chemical compositions, and KR hot metal pretreatment, converter smelting, LF and RH refining, steel blank machining, warm supply or heat supply, steel blank heating and cogging, middle blank surface clearing, reheating, high-pressure water descaling, rolling control and temperature control, cooling control and wire rod forming are carried out in sequence. Rolling comprises roughrolling, medium finish rolling and reducing and sizing. In the medium finish rolling process, in the later period, rolled parts are subjected to water cooling to be below phase change temperature, and the compression ratio of the last two passes is set to be larger than or equal to 35%; coils are slowly cooled online; and the roller speed is constant, a heat preservation cover is closed for heatpreservation, and the rolled parts are discharged out of the cover to be subjected to air cooling to room temperature. The wire rod needs no annealing before drawing, large-draft drawing can be directly carried out, the production cost is reduced, and energy saving and environment protection are achieved.

The preparation process of dispersed polymer liquid-crystal material includes the main steps of: mixing the substrate material and liquid crystal material in the weight ratio of 0.25-1 in a containerthrough stirring, painting the mixture between two conductive glass plates with coated indium tin oxide film, applying DC voltage of 45-65 V across the glass plates to cure the mixture as dispersed polymer liquid crystal material. The dispersed polymer liquid crystal material thus prepared has high phase transferring temperature and high stability. The preparation process is simple, environment friendly, short in preparation period and suitable for industrial production.

The invention discloses a gadolinium compound with dual functions of a magnetic refrigeration function and a ferroelectric function. The chemical formula of the gadolinium compound is shown as follows: [Gd3(HL)(H2L)(NO3)4].C2H5OH, wherein H4L is N, N, N', N'-tetrahydroxyethyl-ethylene diamine; the EtOH is ethanol; and the gadolinium compound has three Gd atoms with different coordination environments, so that an isosceles triangle structure is formed. The preparation method for the gadolinium compound comprises the following steps of: using hexahydrate gadolinium nitrate as metal salt; using H4L as ligand; using LiOH alkali substance to regulate the pH of the mixed solution to 7; and stirring and baking the mixed solution, and separating out the solid and washing the separated solid to obtain the gadolinium compound. The invention has the advantages that the gadolinium compound has excellent magnetic refrigeration and excellent ferroelectric properties, and so that the gadolinium compound has a giant potential value in low-temperature magnetic refrigeration and solid apparatuses such as a ferroelectric memory and the like.

The invention relates to a high-temperature phase-transitional temperature-sensitive fire-extinguishing gel and a preparation method thereof. Through the physical crosslinking between polyacid with a hydrophilic backbone structure and polyamine with a hydrophobic backbone structure, the fire-extinguishing gel is in a soluble state at a low temperature and in a gel state at a high temperature. The fire-extinguishing agent is a low-viscosity aqueous solution at normal temperature; the viscosity is gradually increased as the temperature rises, and then the aquagel is formed and adhered on the surface of burning objects, thus the effect of fire-extinguishing is achieved and the fire behavior is blocked from spreading; after the temperature of the gel is lowered to a certain temperature, the gel is returned to the state of liquid, the residue can be cleaned by using water for flushing, thereby being efficient and environment-friendly. The fire-extinguishing agent provided by the invention has low viscosity, can be spouted by using the traditional squirt gun; meanwhile, other elements, such as fire-proofing agent, flame retardant, and the like, can be added to improve the fire-extinguishing performance of the fire-extinguishing agent.

The invention relates to an optical transparent light-colored polymer and a preparation method thereof, in particular to an optical transparent light-colored high temperature-resisting shape memory polymer and a preparation method thereof, and aims to solve the problems, in the prior art, that an optical transparent shape memory polymer is relatively low in phase inversion temperature and existing transparent polyimide is difficult to generate a shape memory effect due to relatively small thickness, so that the use requirement of a photoelectronic device cannot be met in a high temperature environment. The optical transparent light-colored high temperature-resisting shape memory polymer is prepared from 1,3-Bis(3-aminophenoxy)benzene and 4,4'- Bisphenol A dianhydride as reactive monomers, and has the structural formula shown in the specification. The preparation method comprises the following steps: firstly, dissolving 1,3-Bis(3-aminophenoxy)benzene; secondly, preparing a sol-gel polyamide acid; thirdly, removing residual bubbles; fourthly, performing thermal imidization; fifthly, stripping to obtain the optical transparent light-colored high temperature-resisting shape memory polymer. Through the invention, the optical transparent light-colored high temperature-resisting shape memory polymer can be obtained.

The invention discloses a preparation method of a rare-earth-doped modified nano titanium oxide photocatalyst capable of degrading methyl orange organic dye. In the preparation method of the rare-earth-doped modified nano titanium oxide photocatalyst capable of degrading methyl orange organic dye, a sol-gel method is used to introduce a rare earth ion into a TiO2 lattice so as to introduce new charges into the lattice, further form defects or change the lattice type, affect the movement state of photogenerated electron-hole pairs, adjust the distribution state of the photogenerated electron-hole pairs or change the energy band of TiO2, and finally lead to a change in the photocatalytic activity of TiO2. An obtained rare-earth-doped modified nano-TiO2 powder has uniform particles, has a crystal grain size in a range of 10 to 35 nm. The photocatalytic performance is obviously improved after doping, and the absorption spectrum is shifted to the visible light. Doping of the rare earth ioncan inhibit the transformation of a TiO2 anatase phase to a rutile phase and increase the phase transition temperature. Also, the growth of nanocrystals is inhibited, and effect of refining crystal grains is exerted.

The invention discloses a quaternary relaxation piezoelectric single crystal material and a growing method thereof. The chemical formula of the single crystal material is xPb(Mg1/3Nb2/3)O3-yPb(In1/2Nb1/2)O3-zBiAlO3-(1-x-y-z)PbTiO3, wherein x is more than 0 and less than 1; y is more than 0 and less than 1; z is more than 0 and less than 1; x+y+z is less than 1. The growing method comprises the following steps: weighing the oxide raw materials except lead and presintering the oxide raw materials under high temperature; mixing the presintered materials with the oxide of lead and briquetting the mixture; then carrying out insulation at 500-1250 DEG C for 3-20 hours, continuously raising the temperature to 1340-1410 DEG C, carrying out insulation for 3-15 hours to melt all the starting materials and cooling at a speed of 0.1-1.2mm/h to gradually carry out crystallization, wherein the interface temperature gradient is 20-100 DEG C/cm; after growth is completed, cooling the crystals to the room temperature at a speed of 10-300 DEG C/h. The method can be adopted to grow piezoelectric crystals with different orientations, shapes and dimensions according to the requirements, has the advantages of simple process equipment, convenience in operation, productivity with one furnace and the like and is suitable for large-scale industrial growth or production of crystals.

The invention relates to the technical field of hydrogel composite materials, and discloses the phosphate type epoxy resin-nano clay hydrogel and a preparation method thereof. The phosphate type epoxyresin-nano clay hydrogel comprise the following formula raw materials of hydrogenated bisphenol A, epoxy chloropropane, an alkalizing agent, 1-naphthyl phosphate, an esterification catalyst, the ultrapure water, an end-capping reagent, a functional additive, an initiator and 8-11 parts of nano clay. The preparation method of the phosphate type epoxy resin-nano clay hydrogel comprises the following steps of adding the 1-naphthyl phosphate,carrying out the esterification reaction on the phosphate group and the hydroxyl of the epoxy resin to generate the phosphate-generating epoxy resin, whereinthe phosphate ester contains a large amount of hydrophilic hydroxyl-OH, so that the epoxy resin has better hydrophilicity, and the water absorption property and the water retention property of the hydrogel are improved. Meanwhile, the -OH groups and the ether bonds in the epoxy resin form the hydrogen bonds with high chemical energy, so that the chemical stability of the epoxy resin is better, the phase transition temperature of the hydrogel is greatly increased, and the thermal stability of the hydrogel material is enhanced.

The invention relates to a beta-hydroxyalkyl amide synthesis process, which comprises the steps of inputting diethanol amine and silica into a reaction kettle, adding a multi-component composite catalyst into the reaction kettle, introducing argon gas for three times for gas replacement, extracting gas in the reaction kettle until the pressure reaches negative pressure, stirring and dripping dimethyl adipate into the reaction kettle, heating for two times and constantly stirring and introducing argon gas at the same time, and obtaining the finished product beta-hydroxyalkyl amide after the product cools down naturally. The beta-hydroxyalkyl amide synthesis process has the advantages of reasonable process, reliable performance and the like; under the catalytic action of the multi-component composite catalyst, ammonolysis of dimethyl adipate is realized through diethanol amine, ,and the beta-hydroxyalkyl amide is obtained, besides, sodium carbonate can accelerate the reaction, and sodium sulfite and sodium citrate have efficacy of xanthochromia resistance. The structure of the reaction kettle body for beta-hydroxyalkyl amide synthesis is reasonable, and temperature control and stirring effect are good; as reaction is performed under segmented temperature in the reaction kettle, mass production requirement can be satisfied.

The invention relates to the field of oil field workover and discloses a workover fluid tackifier and a preparation method of same. The invention solves the technical problem that when xanthan gum is employed as the tackifier in the prior art, the anti-high-temperature capability is poor. The workover fluid tackifier includes, by weight, 95.1-98.05 parts of water, 0.3-0.5 parts of xanthan gum, 1-3 parts of potassium formate, 0.05-0.2 parts of thiourea, 0.1-0.2 parts of a sterilizing agent and 0.5-1 part of an olefin monomer polymer. The workover fluid tackifier is enhanced in high-temperature stability of the xanthan gum.

The invention relates to an MPP pipe for electric power engineering and a production process thereof, and belongs to the technical field of pipes. The MPP pipe comprises the following raw materials: modified PP resin, modified hyperbranched polysiloxane, an antioxidant, a solubilizer, a nucleating agent, a filler, a coupling agent and a master batch. The modified hyperbranched polysiloxane has the characteristics of high branched structure, low melting point, low viscosity and easiness in processing, molecules of the modified hyperbranched polysiloxane consist of hard chains and soft chains, and a long chain segment consisting of an azobenzene chain and a benzamide chain is a crystalline phase at low temperature, so that expansion and extension of cracks in a modified PP resin base material can be prevented, and the low-temperature impact resistance of the MPP pipe is further improved; and a molecular chain of the modified hyperbranched polysiloxane contains a benzotriazole structure, and the benzotriazole structure is connected into hyperbranched polysiloxane molecules in a chemical bond mode, so that the weather resistance and the stability of the weather resistance of the MPP pipe are improved.

The invention relates to a method for preparing diesel by hydrogenating anthracene oil. The method comprises the following steps: reacting anthracene oil in hydrogenation reaction region containing a first catalyst; allowing the product oil obtained in the hydrogenation reaction region to enter a hydrocracking reaction region containing a second catalyst to react to prepare a diesel component finished product. The method has the advantages that hydrofining catalysts can realize hydrodesulfurization, hydrodenitrification and hydrodeoxygenation of coal tar and can improve activity, so that aromatic hydrocarbon is saturated and subjected to ring opening; an aid potassium is added into the catalysts, so easy-to-coke substances of the coal tar can be inhibited from coking and blocking reactors and the stability of the catalysts is improved; the acidity of a carrier is effectively controlled by adjusting the adding ratio of titanium dioxide and cerium dioxide of the carrier, so that hydrocracking activity and selectivity are improved; the titanium dioxide has strong adsorption capability on sulfur, so desulfuration is promoted; the cerium dioxide has high melting point, so the stability of the carrier is improved and the service life of the catalysts is prolonged.

The invention discloses a manufacturing method of low-grade non-oriented electrical steel. The method comprises the following steps of during steelmaking, increasing the content of an aluminum element in a plate blank of the low-grade non-oriented electrical steel by 0.08 to 0.12 weight percent; during the hot-rolled plate blank heating, controlling the tapping temperature of the plate blank to be 1150-1200 DEG C; and during hot rolling and rough rolling, controlling the rough rolling RT2 temperature of the plate blank to be 1000 to 1050 DEG C. According to the method, the phase transition temperature of the low-grade non-oriented electrical steel is increased by increasing the aluminum content; and the low-grade non-oriented electrical steel is enabled not to generate rolling force fluctuation due to rolling of a phase transition region in the finish rolling process by combining the tapping temperature control and the rough rolling RT2 temperature control of the plate blank, so that the finish rolling process is stabilized, and the size and plate shape precision of a low-grade non-oriented electrical steel plate coil after finish rolling are improved.

The invention relates to a preparation method for a low-temperature-resistant seed coating agent material, belonging to the technical field of agricultural materials. According to the invention, cholesterol and lecithin are used as wall materials for wrapping of a paraffin material, so a microcapsule particle is prepared; prepared paraffin condenses and releases a great amount of heat when encountering with cold, so the low-temperature resistance of the seed coating agent material is effectively improved; meanwhile, since the surface layer of a prepared seed coating agent has a gel with a hydrophilic structure, the seed coating agent can effectively bond with interior moisture in the epidermal cells of seeds, so partial dehydration of the cells before freezing of the seeds is avoided, thephase transition temperature of cell membranes is improved, and the low-temperature resistance of the seed coating agent material is effectively improved; and an internal structure with the hydrophobic structure is adopted to effectively prevent water from sufficiently penetrating the surface of the seed coating agent, so the internal structure serves as a protective layer to effectively protect internal seed coats from damage by ice crystals formed by freezing and reduce damage to seed coats caused by a low temperature environment, and thus, the low-temperature resistance of the seed coatingagent is effectively improved.

The invention provides a copper silicon alloy sputtering target material and a copper silicon alloy recording layer. The copper silicon alloy sputtering target material and the copper silicon alloy recording layer both consist of CuaSibMc alloy, wherein M is nickel, chromium, molybdenum or titanium, a is 0.55-0.93, b is 0.05-0.25, c is 0.02-0.20, and the sum of a, b and c is 1. The copper silicon alloy recording layer contains copper, silicon, nickel, chromium, molybdenum or titanium with appropriate contents, so that a phase transition temperature is higher than 150 DEG C and is lower than 500 DEG C, and when being applied to optical recording media, the copper silicon alloy recording layer can obtain favorable recording quality, favorable stability and higher programming speed.

The invention discloses a high-damping high-thermal-conductivity gold alloy for bonding wires in electronic fields and a technic thereof. The alloy comprises the following components of, in percentageby weight, 20.0-25.0wt.% of Mn, 4.0-5.0wt.% of Fe, 1.0-2.0wt.% of Ni, 0.4-0.6wt.% of Ge, 0.1-0.2wt.% of Sc, 0.2-0.4wt.% of Ru, 2.0-3.0wt.% of Sn, 0.1-0.2wt.% of Be and the balance Au. The gold alloyprovides a solution which is different from that of a traditional material for gold alloy bonding wires which work in electronic devices with obvious vibration, so that the current situation that existing gold bonding wires do not have damping performance can be effectively overcome. It is predicted that implementation and industrialization of the gold alloy not only can effectively avoid fatiguedamage to the gold bonding wires caused by vibration, but also can obtain great social benefits and economic benefits.

The invention discloses a fabric with bidirectional temperature adjusting performance and a preparation method thereof. The method comprises the following steps: (1) mixing PEG compound, a cross-linking agent and a catalyst and evenly stirring to obtain a temperature adjusting work solution; (2) utilizing a twice-soaking twice-rolling mode to mix and dip dye the temperature adjusting work solutionand fiber fabric according to a material-liquid ratio of (0.5 to 1) to (0.8 to 1.5), wherein each time of dip dyeing is for 3 to 5h; (3) pre-drying a product obtained in the step (2) for 30 to 40minunder the condition of 50 to 60 DEG C and then continuing drying for 4 to 8 min under 130 to 150 DEG C to obtain the fabric with the bidirectional temperature adjusting performance. The prepared fabric disclosed by the invention has the excellent bidirectional temperature adjusting performance and greatly improves clothes comfortableness and environmental temperature adaptability.