2802results about How to "Not easily oxidized" patented technology

A method of assembling an airtight LED light bulb has the steps of: connecting a stem device with an LED device, drying the LED device, connecting the stem device with a bulb envelope, extracting air in the bulb envelope via a pipe, filling the bulb envelope with nitrogen or inert gas via the pipe, sealing an opening of the pipe which is located outside the bulb envelope to make the bulb envelope completely airtight and connecting a cap with the bulb envelope. Because the bulb envelope is airtight, moisture in the environment can not damage the LED device, and the steps of extracting air in the bulb envelope via the pipe and filling the bulb envelope with nitrogen or inert gas via the pipe are feasible. Consequently, the LED device will not easily be oxidized or dampened, so the lifespan of the airtight LED light bulb can be prolonged.

A depression is formed from a first surface of a semiconductor substrate on which is formed an integrated circuit. An insulating layer is provided on the inner surface of the depression. A first conductive portion is provided on the inside of the insulating layer. A second conductive portion is formed on the inside of the insulating layer and over the first conductive portion, of a different material from the first conductive portion. The first conductive portion is exposed from a second surface of the semiconductor substrate opposite to the first surface.

The invention relates to a high polymer-based graphene composite material with positive resistance temperature coefficient, and a preparation method of the material. The composite material comprises a base body and conductive filler; the content of conductive material is 0.01-10wt%; all components are mixed uniformly and are formed through mold-pressing or extrusion/injection molding; and the formed material is irradiated after being dried, so that the high polymer-based graphene composite material with positive resistance temperature coefficient can be obtained. Compared with the prior art, the graphene composite material and the preparation method have the advantages that the manufacturing process is simple, less influence is caused to the performance of base material, oxidation is unlikely to occur, the resistivity is more stable, the circulation stability of the material is better, and NTC (Negative Temperature Coefficient) effect is not generated easily.

The invention discloses a magnetic gold nanoparticle composite material, and a preparation method and application thereof. The preparation method comprises the following steps: synthesizing ferroferric oxide magnetic microspheres, adding tetraethoxyl silicon to implement hydrolysis and polymerization on the magnetic microsphere surfaces, adding N-(2-aminoethyl)-3-aminopropyltrimethoxysilane to obtain surface-modified double-amino-group Fe3O4/SiO2 magnetic microspheres, and compounding the surface-modified double-amino-group magnetic microspheres with gold nanoparticles. The chelation action of the double amino groups is utilized to adsorb the gold nanoparticles more firmly; and the material combines the surface selectivity of the gold nanoparticles and the superparamagnetism of the magnetic nanoparticles, can extract benzopyrene in water, and can implement quick and efficient separation.

The invention discloses a method for preparing a heavy rare earth hydride nano-particle doped sintered NdFeB permanent magnet, which belongs to the technical field of magnetic materials. The prior preparation method improves the coercive force and the temperature stability of magnets by adding heavy rare earth elements, namely terbium or dysprosium into master alloy, but the method can cause the residual magnetism of the magnets, the reduction of magnetic energy product and the increase of manufacturing cost. The method adopts heavy rare earth terbium hydride and dysprosium hydride nano-powder doping technology to prepare the sintered NdFeB permanent magnet with high coercive force and excellent magnetic property. The method comprises the following steps: preparing NdFeB powder by a rapidly solidified flake process and a hydrogen decrepitation process; preparing the terbium hydride or the dysprosium hydride nano-powder by physical vapor deposition technology; mixing the two powders, and performing magnetic field orientation and press forming; and performing dehydrogenation treatment, sintering and heat treatment on a green compact at different temperatures, and obtaining the sintered magnet. The coercive force of the magnet prepared by the method is higher than that of the prior sintered magnet with the same ingredients; and compared with the sintered magnet with the equivalent coercive force, the proportion of the terbium and dysprosium needed by the magnet prepared by the method is remarkably reduced.

The invention discloses a preparation method of magnetic/gold nano particles. The preparation method comprises the following steps: firstly adopting a co-precipitation method to prepare the magnetic Fe3O4 nano particles; polymerizing the dopamine in-situ on the surfaces of the magnetic particles to obtain Fe3O4 nano particles modified by the poly dopamine; introducing polyphenol and amino groups to the surfaces of the Fe3O4 nano particles; absorbing the nano gold seeds on the surfaces of the modified magnetic particles through the static action; adopting the nano gold which is absorbed on the surfaces of the magnetic particles as the seed, adopting the polyphenol on the surfaces of the magnetic particles as a reducing agent, gradually adding the chloroauric acid liquid to gradually produce the gold layers on the surfaces of the magnetic particles to obtain the core-shell magnetic/gold nano particles. The nano particles have good water dispersion and strong magnetic respond performance. The diameters of the nano particles are 30-100 nanometers, the saturation magnetization is 30.1-38.7emu/g, and the nano particles are superparamagnetic. The nano particles have wide application prospect on the fields of targeted drug controlled release, thermal therapy, separation of protein and enzyme, etc.

A wiring board includes a pad exposed from an opening portion of an outermost insulating layer. The pad includes: a first metal layer a surface of which is exposed from the wiring board; a second metal layer provided on the first metal layer and formed of a material effective in preventing a metal contained in a via inside the board from diffusing into the first metal layer; and a third metal layer provided between the second metal layer and the via, and formed of a material harder to be oxidized than that of the second metal layer. The thickness of the third metal layer is relatively thick, and is preferably selected to be three times or greater than a thickness of the second metal layer. A side surface of the third metal layer and a surface of the third metal layer to which the via is to be connected are roughed.

The present invention is one kind of nutrient reinforcing agent for artificial fry raising of marine animal, and relates to the recipe and preparation process of micro algae bait nutrient reinforcing agent. The microalgae bait nutrient reinforcing agent consists of several kinds of micro algae containing different nutritious components and has grain size of 5-20 microns. It contains great amount of DHA, ARA and natural astaxanthin, and can raise the immunity and survival rate of raised marine animal. It can meet the requirement of hatched fries of fishes, shrimps and shells in feed. For example, when the microalgae bait nutrient reinforcing agent is used in raising turbot, it can raise the survival rate and lower the albinism rate greatly.

The invention discloses a preparation method of a nitrogen-doped porous carbon nano sheet composite material. The preparation method comprises the steps of performing high-temperature carbonization treatment on a mixture which consists of melamine and adjacent phenanthroline iron and serves as a precursor in a tubular furnace under an inert gas environment, and then removing dissolved iron compounds from an acidic solution to obtain a porous carbon nano sheet layer with carbon-coated iron carbide nano particles. The preparation method has the advantages that the technology is simple, the raw materials are cheap, and operation is easy to implement; in the prepared composite material, iron carbide is uniformly dispersed in the carbon nano sheet layer, so that the composite material is high in specific surface area and pore volume; iron carbide nano particles are completely coated by graphitized carbon, so that oxidization and corrosion are hardly caused; the composite material is stable in acidic electrolyte, and the battery activity can be effectively improved; when used as an electrocatalyst, the composite material is relatively high in electrocatalysis efficiency; the preparation method has an important value and significance in the field of preparation of doped carbon nano composite materials and electrocatalysis of proton membrane fuel batteries.

The invention relates to a method for preparing semi aromatic copolymer nylon, belonging to the technical field of preparation materials for high temperature resistant nylon with high strength and high stability. According to the method, nylon salt is firstly synthesized, then semi aromatic copolymer nylon prepolymer is mainly synthesized at lower temperature and lower pressure, the semi aromatic copolymer nylon prepolymer is prevented from yellowing due to oxidization at high temperature in discharging so as to affect the quality, due to the requirement of lower pressure, the requirement on preparation equipment is lowered, and the production cost is greatly lowered.

The invention discloses a preparing method for green synthesis of nanoscale zero-valent iron through water hyacinth extraction liquid and application. Water hyacinth stem and leaf extraction liquid serves as a reduction agent to reduce iron ions or ferrous ions to the zero-valent iron, a chromium pollution water green repairing material-green synthesis nanoscale zero-valent iron particles are obtained through preparing. The synthesis method is low in synthesis cost, small in energy consumption, simple in process, and free of a special device, the used reduction agent is the water hyacinth stem and leaf extraction liquid, wastes are utilized, and the synthesized particles are easily agglomerated and have the beneficial effects of being good in flowability, large in specific surface area, high in stability and the like. The repairing material prepared through the method is suitable for repairing the chromium pollution water and is high in repairing efficiency.

The invention discloses a tin-zinc series lead-free alloy soldering paste and a manufacturing method thereof. According to the weight percentage, the tin-zinc series lead-free alloy soldering paste consists of 85 to 90 percent of solder alloy powder as well as 10 to 15 percent of scaling powder; wherein, the solder alloy powder consists of 8 to10 percent of zinc, 0.005 to 1.0 percent of rare earth element, 0.001 to 0.1 percent of aluminum as well as tin according to the weight percentage; the total amount of each component is 100 percent; wherein, the scaling powder consists of 15 to 60 percent of modified rosin, 3 to 20 percent of activator, 1 to 10 percent of paste forming agents, 2 to 10 percent of thixotropic agents, 0.1 to 3 percent of azimino-benzene, 0.1 to 8 percent of trichloride isocyanuric acid as well as organic solvent according to the weight percentage; the total amount of each component is 100 percent. The solder alloy powder and the scaling powder are respectively prepared and then mixed uniformly for preparing the tin-zinc series lead-free soldering paste. The lead-free soldering paste has excellent wettability, is hard to be oxidized, has good welding performance and is suitable for an SMT technique flow.

A probe or an electrical connector comprises a substrate with a surface having a plurality of electrical contact locations. A shaped elongated electrical conductor has a first end coupled to one of the electrical contact locations and a second end thereof which projects away from the electrical contact location and through an aperture in a sheet of material. The sheet is disposed to be spaced apart from the surface of the substrate. At the second end of the elongated electrical conductor there is a tip structure, which is larger than the aperture in the sheet of material. The tip structure has a pointed portion thereof. The tip structure is disposed against contact locations of a contact surface. The electronic structure is moved towards the contact surface permitting the tip structure to penetrate into the surface of the electrical contact location thereon and to move, wipe, or vibrate across the surface thereof as the shaped elongated electrical conductor flexes as a result of being compressed by the movement of the electronic structure toward the contact surface.

The invention discloses an internal-combustion engine variable geometry turbocharger nozzle ring component, comprising forks(1), a mounting plate(2) and a blade(3), wherein the side surface of the mounting plate(2) is provided with a plurality of groups of blades(3) which are evenly spaced and arranged on the same circumference and are in the same direction, each group of blades which consists of at least three blades(3) and can be mutually opened and folded simultaneously; the other side of the mounting plate is provided with forks(1) which are connected with corresponding blades; because the blades are the three dimensional curved surface, air inlet passages for blades are continuously changed, the air input of the turbocharger is also continuously changed according to the working condition of the engine, thereby the engine can get proper amount of pressurized air under all conditions, which makes that the engine always runs under a reasonable condition, thereby realizing that the turbocharger increases the output power of the engine by 30 to 100 percent, reducing the emission of harmful gas by more than 10 percent, realizing that the fume emission reaches the emission standard of the European IV, lowering oil consumption by 5 to 10 percent and improving the economical efficiency of the automobile.

The invention discloses coated type nanoscale zero-valent iron as well as a preparation method and an application thereof. The coated type nanoscale zero-valent iron comprises nanoscale zero-valent iron and sodium alginate, wherein the nanoscale zero-valent iron is coated with sodium alginate, and a mass ratio of sodium alginate to the nanoscale zero-valent iron is (0.1-0.4):1. The preparation method of the coated type nanoscale zero-valent iron comprises the step that the nanoscale zero-valent iron and a sodium alginate solution are mixed and subjected to ultrasonic treatment, and the coated type nanoscale zero-valent iron is obtained. The coated type nanoscale zero-valent iron can be used for treating sediment with heavy metal pollution, is simple and convenient to operate, good in stabilizing effect, good in mobility, low in repair cost, clean and pollution-free, has no toxic and harmful effects on the environment and has broad application prospect in the technical field of treatment of heavy metal pollution of the sediment.

A powder metal steel alloy composition for high wear and temperature applications is made by water atomizing a molten steel alloy composition containing C in an amount of at least 3.0 wt %; at least one carbide-forming alloy element selected from the group consisting of: Cr, V, Mo or W; an O content less than about 0.5 wt %, and the balance comprising essentially Fe apart from incidental impurities. The high carbon content reduces the solubility of oxygen in the melt and thus lowers the oxygen content to a level below which would cause the carbide-forming element(s) to oxidixe during water atomization. The alloy elements are thus not tied up as oxides and are available to rapidly and readily form carbides in a subsequent sintering stage. The carbon, present in excess, is also available for diffusing into one or more other admixed powders that may be added to the prealloyed powder during sintering to control microstructure and properties of the final part.

The invention relates to a preparation method of an anionic aqueous polyurethane dispersoid for fabric coating and decoration. The preparation method is operated according to the following steps that: (a) polyether polyol, polyester polyol and diisocyanate are subjected to polymerization reaction for 2 to 4 hours at 70 to 90 DEG C under the effect of catalysts; (b) acetone solvents and diamine hydrophilic chain extenders containing picolinic acid structures are added for taking reaction for 5 to 30 minutes at 40 to 65 DEG C, and polyurethane prepolymers are prepared; (c) the temperature is lowered to 20 to 40 DEG C, low-molecular-weight chain extenders and water are added and are emulsified through being stirred at high speed; (d) the acetone solvents are removed through reduced pressure distillation, and the anionic aqueous polyurethane dispersoid for fabric coating and decoration is obtained. Because diamine containing the picolinic acid structures is used as hydrophilic chain extenders, the regular pyridine ring structure is contained, the crystallization performance and the initial bonding intensity can be improved, meanwhile, a pyridine ring is an electron deficiency system, the color deepening caused by oxidation cannot easily occur, and the product has the yellowing resistance performance.