30results about How to "Overcome oxidation" patented technology

The invention discloses a single-beam-laser multidimensional speed measuring system of a high-speed rarefied gas flow field. The single-beam-laser multidimensional speed measuring system comprises a high-speed rarefied gas wind tunnel (1), a laser light source module (2), a laser beam shaping module (3), a high-voltage arc discharge module (4), a fluorescent signal collecting and recording module (5), a data processing module (6) and a time sequence synchronous control module (7). The invention further provides an application method of the system.

The invention discloses a modified high-speed steel roller and a preparation method thereof. The modified high-speed steel roller is formed by adopting a centrifugal composite casting method and has a roller outer layer of high-speed steel and a roller inner layer of ductile iron or high-strength cast iron. The preparation method comprises the following steps of: forming the roller outer layer on a centrifugal casting machine; then, filling a static roller core with melted iron; and casting into a high-speed steel composite roller. The roller outer layer of the high-speed steel roller is prepared from raw materials in percentage by weight: 60-65 percent of M2 high-speed waste steel (W6Mo5Cr4V2), 1.0-1.4 percent of metal aluminum, 5.0-5.5 percent of boron iron, 9.2-9.4 percent of carbon ferrochrome iron, 0.2-0.4 percent of titanium iron, 1.0-1.2 percent of nickel-magnesium alloy and 18-23 percent of waste steel Q235. The roller can be produced by utilizing an electric furnace, has high hardness, simple and convenient process, low production cost and favorable wear resistance without adding noble iron alloy or quenching treatment and can have favorable economic benefits by popularization and use.

A preparation method of MgB2 superconducting material, weighing Mg powder and B powder according to the molar ratio Mg:B=1:2, and simultaneously weighing an organic acid whose mass is 5%-30% of the total mass of Mg powder and B powder Or organic acid salt, dissolve in 5-50mL acetone or ethanol, mix the obtained solution with Mg powder and B powder, ball mill for 1-10 hours, and then dry in a vacuum oven. Press the obtained powder into tablets to obtain MgB2 superconducting block material; or put the powder into a metal tube or a metal composite tube, and after sealing, perform swaging, drawing and rolling in sequence with a deformation rate of 5% to obtain a MgB2 superconducting wire strip material; put the obtained superconducting block or wire strip in a vacuum furnace, under the protection of vacuum or argon atmosphere, heat treatment temperature is 650°C-950°C, keep warm for 0.5-2 hours, and finally make MgB2 superconducting material. The MgB2 superconducting material prepared by the invention effectively overcomes the problems of oxidation and spontaneous combustion of the refined magnesium powder after high-energy ball milling, and at the same time significantly improves the superconducting performance of the MgB2 superconducting material due to the introduction of dopants.

The invention provides a preparation method for a TiO2/SiO2-Ag-SiO2 nanocomposite film. The method comprises the steps of: injecting Ag ions and then forming Ag nanoparticles in a quartz glass substrate; and then depositing a TiO2 film on the surface of a silica substrate by virtue of direct-current reactive magnetron sputtering so as to obtain the TiO2/SiO2-Ag-SiO2 composite film. The Ag nanoparticles prepared by the method provided by the invention are inlaid in quartz glass, thus greatly overcoming the problem that the Ag nanoparticles are oxidized. Via the nanocomposite structure prepared by the method provided by the invention, the absorption of titanium dioxide to an ultraviolet ray part is greatly improved, so that the photocatalytic efficiency is improved. The preparation method can be widely applied to the field of optoelectronics.

A squid ink polyose is prepared proportionally from the ink sac of squid, food-class lipase and food-class papain through proportional mixing, enzyme hydrolyzing, filtering, depositing in edible alcohol or chemical-purity acetone, dissolving deposit in deionized water, recovering alcohol or acetone, drying the deposit, and pulverizing. It has high stability.

The invention discloses a welding method for CO2 gas shielded welding, which selects a flux-cored wire with a deoxidizing agent component for welding, and comprises: before welding, removing moisture in the CO2 gas and cleaning impurities on a workpiece; and in the welding process, selecting reasonable welding conditions, current, voltage, electric arc and wire extending length, and controlling temperature and humidity of operating environment, wherein workpieces of which the thickness is less than 6mm are provided with I-shaped bevels; and workpieces of which the thickness is more than 6mm are provided with bevels between 40.5 and 41.5 DEG. The method solves the problems that the oxidability of the CO2 gas shielded welding and the size of air holes and bevels influence material using amount, the formation of weld of the CO2 gas shielded welding is poor, and the like by the prior welding method.

The invention relates to an irradiation cross-linking EPDM (Ethylene-Propylene-Diene Monomer) insulating eraser and a preparation method thereof. The irradiation cross-linking EPDM insulating eraser comprises ingredients in parts by weight: 80-20 parts of EPDM A, 20-80 parts of EPDM B, 2-5 parts of sensitizer, 1-3 parts of anti-sticking agent, 1-3 parts of release agent, 1-3 parts of lubricating auxiliaries, 5-10 parts of active agent, 1-3 parts of antioxidant, 5-10 parts of plasticizer, 50-60 parts of reinforcing agent, and 50-70 parts of filling agent. According to the irradiation cross-linking EPDM insulating eraser and the preparation method thereof, by adopting a new sulfuration mode, namely irradiation cross-linking mode, the problems that the existing direct steam pipeline sulfuration mode causes the oxidation of a copper wire, water of a cable and surface pollution to the cable and the like can be thoroughly avoided.

The invention relates to a preparation method for rose fruit or rose seed oil, which comprises the main procedures: sorting and removing coarse rose fruit, crushing the rose fruit, removing husks, then breaking rose seeds into particles and heating the particles in a frying pan up to 40 DEG C to 60 DEG C to separate out the rose oil through one to three levels of squeezing, as well as separating out ester gum and phospholipid from the rose oil; and maintaining the purity of the rose oil through filtration, storage and purification.

The invention relates to a method for improving the compressive strength of alkali pellets prepared with limestone. The method comprises the following steps of: grinding the limestone into superfine particle size of less than 3 microns, adding the limestone powder of superfine particles into pellet concentrate powder with the particle size of less than 74 microns, adding water, and mixing uniformly in a mixer, wherein an adhesive is not used in proportioning; and pelletizing the uniform mixture, and roasting the screened fresh pellets. The roasting process comprises drying, preheating, roasting, soaking and cooling; and oxygen enrichment is performed in the preheating and roasting processes, the oxygen content in the preheating process is kept between 12 and 15 percent, and the oxygen content in the roasting process is kept between 10 and 12 percent. The problem that the compressive strength of the alkali pellets prepared with the limestone obviously declines is effectively solved through the measures of grinding of the limestone, oxygen enrichment in the roasting process and the like.

The invention discloses a conductive paste for an electronic component such as a single-layer or multi-layer capacitor, a varistor, a surge absorbing element and the like. The conductive paste comprises conductive metal powder, glass, resin, a solvent and a chemical additive. Through the mode, when the conductive paste for the electronic component is sintered in the air, copper is used for replacing part of silver metal, so that the problem of copper oxidation is solved, the sintering temperature can be reduced, energy is saved, the production cost and the manufacturing difficulty are reduced, the manufacturing time is shortened, and the working efficiency is improved.

The invention relates to a diethyl ether purification method. The method comprises the following steps: adding a free radical scavenger and a hydroperoxide decomposer into diethyl ether or adding a mixed solution of the free radical scavenger and the hydroperoxide decomposer into diethyl ether to purify the diethyl ether, and then purifying the purified diethyl ether mixed solution after a full reaction by adopting any one of a liquid separation extraction method, a filtering method or a re-evaporation method to obtain purified diethyl ether. The invention also discloses a method for improvingthe purity of the nitrogen-containing organic matter by using diethyl ether, and an application thereof. The diethyl ether used in the method is purified by using the purification method. The purified diethyl ether is used for cleaning the nitrogen-containing organic matter, so active free radicals and peroxydiethyl ether contained in the diethyl ether are removed, and generation of halogen elementary substances in the nitrogen-containing organic halide is effectively reduced, thereby the high-purity nitrogen-containing organic matter is obtained. The methods have the characteristics of simplicity, feasibility, low cost and the like.

The invention provides a filling method for a cadmium column used for water nitrate determination and relates to determination of nitrate in water.A syringe piston is dismantled, and a syringe is filled with cadmium particles; the syringe sucks in a hydrochloric acid solution to be washed, oxide layers on the surfaces of the cadmium particles are removed, the acid solution is removed, and the syringe sucks in ultrapure water to be washed to be neutral; the syringe sucks in a copper sulfate solution for shaking soaking, the waste solution is removed, ultrapure water is used for shaking washing till no colloidal copper is contained, and the syringe sucks in ultrapure water which seals the cadmium particles; glass fibers are stuffed into the bottom of a reduction column, a connector is installed, and the whole reduction column is immersed in a water container to be filled with water; a syringe needle is taken down, a syringe nipple and the upper portion of the reduction column are connected, the syringe nipple is immersed in water downwards, the head of the syringe is beaten, the syringe piston is pushed to make the cadmium particles enter the reduction column, glass fibers are stuffed into the upper portion of the reduction column, and the connector is installed; the cadmium column is activated according to the method in GB17378.4-2007, the reduction rate of the cadmium column is determined, and then filling of the cadmium column is completed.