89results about How to "Stable at high temperature" patented technology

The invention relates to a monolithic catalyst for catalytic combustion of propane, wherein a coating slurry prepared from an active component, a co-catalyst, pseudo bohemite and gamma-Al2O3 is coated on a monolithic carrier and then high-temperature calcination is performed to form the monolithic catalyst, the monolithic carrier is a cordierite honeycomb ceramic, the active component of the catalyst is Co3O4, and the co-catalyst is one or a plurality of materials selected from ZrO2, CeO2 and La2O3. According to the present invention, the catalyst is mainly used for the catalytic combustion of low-carbon chain alkanes, has characteristics of high thermal stability, low price and simple process, and is suitable for application in industrial production; and according to the preparation method, the Co3O4 powder catalyst is used to prepare the monolithic catalyst, such that the generation of the inert component CoAl2O4 is reduced, the reproduction of the activity of the powder catalyst is ensured, and a certain reference is provided for the preparation of the catalysts.

The invention provides a special-purpose welding rod for built-up welding of hot work die restoration. The special-purpose welding rod comprises a coating and a welding core. Nanometer chromium-nitride powder is added into alloy powder and a fine nitride interstitial phase is formed in deposited metal, so that the deposited metal has excellent toughness and crack-resistant performances. Meanwhile, yttrium oxide is added into the alloy powder, so that the deposited metal can be purified, occluded foreign substances can be spheroidized, formation of the nitride strengthening phase can be promoted, and the anti-fatigue performance of the deposited metal is improved. When the welding rod is used for restoring the hot work die, the obtained deposited metal has the excellent high-temperature anti-oxidation performance, wear-resistant performance, cleanliness and anti-fatigue performance.

The invention provides a scintillation crystal magnesium tantalum oxide. The chemical formula of the crystal is Mg4Ta2O9, the crystal belongs to a hexagonal crystal system and has an ilmenite structure, the scintillation light yield is 16000 photons/M eV, the decay time is 5 [mu]s, and the energy resolution is 6.2%. The invention also provides a use of the Mg4Ta2O9 as a scintillation crystal material, and a preparation method of the Mg4Ta2O9. The preparation method comprises the following steps: MgO and Ta2O5 which are used as initial powders are uniformly mixed according to a molar ratio of 4.04:1, and are processed to form a raw material rod, the raw material rod is pre-sintered to obtain a pure-phase, dense and uniform polycrystalline rod, and the colorless and transparent rod-shaped crystal having a size of phi 4 mm * L 62 mm grows by adopting an optical floating zone technology. The method has the advantages of stable melting zone, simplicity in operation, effectiveness in inhibition of the volatilization of MgO, and maintenance of uniform composition and stable crystal quality.

The invention provides a metal powder cored wire specially used for hot-working die repair. The metal powder cored wire comprises a wire pipe wall and powder wrapped by the wire pipe wall. The powder is composed of, by mass, 4-8 parts of electrolytic manganese, 2-6 parts of 45# silicon iron, 1-4 parts of ferrotitanium, 20-35 parts of chromium metal, 20-30 parts of high-carbon ferro-chrome, 0-5 parts of graphite, 2-6 parts of ferrovanadium, 12-18 parts of ferromolybdenum, 2-4 parts of tungsten powder, 4-8 parts of nickel powder, 1-2 parts of nanometer chromium nitride powder, 2-6 parts of yttrium oxide powder, 1-2 parts of potassium feldspar and 1-4 parts of sodium fluosilicate. The nanometer chromium nitride powder is added, fine nitride interstitial phases are formed in deposited metal, and therefore the deposited metal has good toughness and anti-cracking capacity; yttrium oxide is added to the alloy powder, the deposited metal is purified, inclusions are nodulized, a nitride strengthening phase is promoted to be formed, and the anti-fatigue performance of the deposited metal is improved. A hot-working die is repaired through a gas metal arc welding technology in which the metal powder cored wire is combined with full-argon gas shielding. The obtained deposited metal has excellent high-temperature oxidation performance, abrasion resistance and cleanliness and good anti-fatigue performance.

The invention provides laser cladding alloy powder for repairing and remanufacturing a hot-working die. In order to solve the problem that nickel-based or cobalt-based thermal spraying powder is expensive, iron-based alloy powder is adopted in the invention. While the iron-based alloy is formed through replacing pure iron with waste steel, the reutilization of the waste is realized. However, as the impurity content in the waste steel is high, the removal of phosphorous, carbon and sulphur is required in the refining process so as to obtain molten steel of which the components and temperature are qualified. The traditional method usually removes the impurities through slagging in the form of furnace slag, but has the problems of high heat energy requirement, large metal losses and serious splashing. In order to solve the problems, a traditional slag former is replaced by yttrium oxide, and waste steel impurities and glomeration inclusions are removed through the purifying functions of rare-earth elements. Meanwhile, deposited metal is endowed with excellent anti-fatigue performance.

The invention discloses an egg-milk powder essence composition and a preparation method thereof. The egg-milk powder essence composition comprises the following components in parts by weight: 35-50 parts of enzymatic hydrolysate, 35-44 parts of maltodextrin, 4-6 parts of starch sodium octenylsuccinate, 1-3 parts of glucose powder, 0.2-0.4 part of sodium alginate, 0.1-0.3 part of sodium carboxymethylcellulose, 4-6 parts of an egg-milk essence base and 1.5-3.5 parts of palm oil, wherein the enzymatic hydrolysate is mainly prepared by the step of carrying out heating and enzymolysis on raw materials, wherein milk and egg pulp are used as the raw materials, and protease and phospholipase are used as catalysts. According to the egg-milk powder essence composition, flavors of the milk, egg white and egg yolk are naturally and realistically integrated; meanwhile, the egg-milk powder essence composition has excellent high temperature resistance and can be used for directly perfuming baking foods, candies, milk products and leisure foods so as to enable the baking foods, candies, milk products and leisure foods to have the egg-milk flavor.

The covalent layer-by-layer self-assembling process for constructing polymer film on planar substrate includes the first reaction of the substrate of surface aminated quartz or silicon chip and polymer with side radical containing epoxy group to form one layer of nanometer superthin film on the substrate by means of covalent bond; the subsequent reaction to polymer with side radical containing amino group to form one other layer of nanometer superthin film; and repeating the reaction with these two kinds of polymer solution to form superthin polymer film in multilayer structure, with each of the layers possessing thickness capable of being regulated in subnanometer level. The present invention has the features of simple technological process, adjustable film thickness, easy functionalizing, acid, base and organic solvent resistance of the film, high stability, etc. and is expected to find application in electronics, medicine, chemical and other fields.

The invention discloses pure crystalline acne-removing amino acid face cleansing cream and a preparation method thereof. The mild easy-to-spread-and-use pure crystalline acne-removing amino acid face cleansing cream is prepared from the following raw materials by mass: 1) 15-40% of a surfactant which is a mixture of two or more than two of an anionic surfactant, a zwitterionic surfactant and a nonionic surfactant, 2) 5-30% of a moisturizing agent, 3) 1-8% of a conditioner, 4) 1-15% of an anti acne composition, 5) 0.1-0.5% of flavor and 6) balance of deionized water. The product has the advantages of stable quality, easy spreading and use, weak acidity, mildness and strong cleaning power. After the pure crystalline acne-removing amino acid face cleansing cream is used, face is clean, not dry and not tight, and the use feeling after use of the product is greatly improved.

The embodiment of the invention discloses an environment-friendly nano antifouling algicide and a preparation method thereof. The environment-friendly nano antifouling algicide is prepared from the following raw materials by mass percent: 5 to 10 percent of water-based nano silver dispersoid size, 10 to 20 percent of 4,5-dichloro-N-octyl-4-isothiazoline-3-one, 5 to 10 percent of 2-octyl-4-isothiazoline-3-one, 5 to 10 percent of benzimidazole, 3 to 5 percent of emulsifier, 5 to 8 percent of antifreeze, 1 to 3 percent of penetrant, 1 to 3 percent of amine neutralizer, 1 to 3 percent of thickener, 5 to 10 percent of solubilizing stabilizer, 5 to 10 percent of synergist, 5 to 8 percent of ethanol and 20 to 30 percent of deionized water. The environment-friendly nano antifouling algicide and the preparation method thereof disclosed by the invention have the characteristics of low manufacturing cost, low toxicity, safety for water source and environment, and are of great significance for saving energy, protecting the environment and creating a harmonious relationship between human and nature.

The invention relates to the technical field of humidity regulation, more particularly to a domestic waste gasification device and a process. The domestic waste gasification device comprises a gasification furnace; a material inlet is arranged at that top of the gasification furnace, an ash-slag outlet is arranged at the bottom of the gasification furnace, a gasification gas outlet is arranged atthe side wall of the gasification furnace, and domestic garbage enters a drying zone, a pyrolysis zone, a reduction zone and an oxidation zone in turn for treatment, so that the obtained ash-slag is discharged through the ash-slag outlet and the obtained gasification gas is discharged through the gasification gas outlet; a fire grate is arranged at the junction of the oxidation zone and the ash-slag zone, a backdraft device for drying and filtering the gas is communicated between the drying zone and the ash-slag zone, the backdraft device is provided with a backdraft suction port communicatingwith the drying zone and a backdraft air outlet communicating with the ash-slag zone, the backdraft air outlet is arranged below the grate, and an igniter is arranged besides the side of the backdraft air outlet. The invention extracts the mixed gas at the top of the gasification furnace, dries and removes water vapor, thereby facilitating the continuous gasification reaction of the gasificationfurnace; the gasified gas after filtration and purification is ignited and then enters the furnace to effectively avoid the deflagration phenomenon.

This invention relates to a not expanding material used at minus 140 to 700 deg, belongs to non-metal material region. The invention takes PbO, TiO2, Bi2O3, Fe2O3 and ZnO as precursor, utilize high temperature solid phase method to prepare ( 1 - X - Y) PbTiO3 - xBiFeO3 - yBi ( Zn1 / 2Ti1 / 2) O3 powder body, require the X is not less than 0.0 and not greater than 0.2, and Y is not less than 0.0 and not greater than 0.4; accordingly weigh the PbO, TiO2, Bi2O3, Fe2O3, and ZnO, then ball mill in ethanol solution for 1 to 48 hours for intensive mixing, drying and squashing to make sheet, calcining at 700 to 1300 deg for 1 to 24 hours, the offspring after calcining ball mill at ethanol solution for 1 to 48 hours, then drying again and squashing for sheet, calcining at 800 to 1300 deg for 1 to 48 hours, cooling, the finished product after grinding is zero expanding material PbTiO3 - BiFeO3 - Bi ( Zn1 / 2Ti1 / 2) O3.

The invention relates to the field of powder metallurgy, in particular to a preparation method of a high-temperature-softening-resistant high-strength high-conductivity copper-based composite material molded part, which comprises the steps of precursor powder preparation, nano molybdenum carbide-copper composite powder preparation, green body forming and combined densification. Nano molybdenum carbide particle reinforced copper-based composite powder is prepared through a co-precipitation-co-reduction-selective carbonization process, a composite material blank is prepared through a cold isostatic pressing forming process, and a copper-based composite material forming part with high strength, high conductivity, high wear resistance and high softening temperature is obtained after high-temperature sintering and deformation machining combined densification. The nanoscale molybdenum carbide particles in the copper-based composite material are stable at high temperature, can hinder dislocation movement at room temperature and high temperature, are remarkable in dispersion strengthening effect, have small influences on the electric conduction and heat conduction performance of the material and are excellent in comprehensive performance, and the copper-based composite material has important application prospects in the fields of heat dissipation grooves, electric resistance welding electrodes, nuclear reactor high-temperature-resistant high-heat-conduction components and the like.

The invention provides a preparation method of sodium nitroprusside injection. The preparation method comprises the following steps: (1) accurately weighing sodium nitroprusside according to a mass volume ratio of each 50g of sodium nitroprusside: added water for injection enabling a solution to reach 100mL, adding the water for injection to the sodium nitroprusside so as to dissolve the sodium nitroprusside into a 20%-30% concentrated solution, adding 0.1-0.2% of activated carbon, stirring for 15-25 minutes, and carrying out coarse filtration so as to remove carbon; (2) supplementing the water for injection, and then carrying out refined filtration by using a filtering membrane; and (3) respectively filling the solution subjected to refined filtration into sterile penicillin bottles, partially stoppering, putting in freeze-drying equipment, and carrying out freeze-drying according to a freeze-drying curve. The preparation method has the advantages that proper temperature, pressure and heating rate are adopted in a preparation process, the intense moisture absorption of an inner loose structure of the product is avoided, the product is prevented from absorbing moisture again after being dried, the occurrence of the shrunk product is reduced, and the percent of pass is increased; and additives for improving surface activity do not need to be added, the risk caused by impurity introduction is reduced, and the production efficiency is improved.

The invention relates to a compact forsterite fire-resistant raw material and a preparation method of the compact forsterite fire-resistant raw material. The technical scheme of the invention is as follows: the preparation method comprises the following steps of: mixing 69wt%-85wt% of talcum powder, 13wt%-30wt% of fine powder of magnesian raw material, and 0.2wt%-2wt% of an additive to prepare a mixed material; then adding 1wt%-10wt% of a bonding agent relative to the mixed material, and ball-milling the mixed material and the bonding agent in a ball mill for 1-3 hours to prepare a ball-milled material; then adding 3wt%-10wt% of water relative to the ball-milled material in the ball-milled material, stirring for 10-30min, forming a blank body by pressing and drying; and finally calcining the dried blank body at 1350-1650 DEG C, keeping the temperature for 1-3 hours, and then obtaining the compact forsterite fire-resistant raw material. The compact forsterite fire-resistant raw material disclosed by the invention has the characteristics of being low-cost in production and easy to sinter, and the prepared compact forsterite fire-resistant raw material has large volume density, low porosity and stable high temperature property.