14results about How to "Flawless" patented technology

The application discloses a surface-defect-free high-purity oxygen-free copper wire manufacturing method based on continuous extrusion, relates to the field of non-ferrous metal precision machining technology, and directly adopts an up-drawing continuous casting billet to extrude a target specification wire rod in one step through continuous extrusion, so that a plurality of drawing processes and at least one intermediate annealing process in a traditional process are completely omitted, a process flow is compressed by more than 60%, a production cycle is significantly shortened, equipment investment, labor cost and energy consumption loss are reduced, wire rod production efficiency is greatly improved, large-scale production cost is greatly reduced, and the application has a strong industrialization advantage; the continuous extrusion process introduces large plastic deformation, can strongly break original as-cast coarse grains, and simultaneously compacts and eliminates internal defects such as pores and shrinkage porosity generated in the up-drawing continuous casting process, and improves wire rod density. Compared with a traditional processing method, the wire rod prepared by the application avoids problems such as annealing oxidation, uneven structure and performance fluctuation, and the elongation of a finished product is greater than or equal to 40%.

This invention relates to a short-path remelting laser selective melting additive manufacturing process for high-temperature titanium alloys with small layer thicknesses, belonging to the field of laser additive manufacturing technology. Addressing the challenge of cracking in laser selective melting of high-temperature titanium alloys, this invention innovatively proposes a short-path remelting laser selective melting additive manufacturing process with small layer thicknesses. It overcomes the challenges of temperature and stress field control during the laser selective melting process of high-temperature titanium alloys, achieving precise control of the temperature gradient and residual stress, effectively eliminating the risk of cracking during additive manufacturing. The high-temperature titanium alloy formed by this process has a density ≥99.0%, is free of cracks and incomplete fusion defects, and has a yield strength ≥1000MPa and tensile strength ≥1100MPa in the deposited state. After heat treatment, the room temperature yield strength of the titanium alloy is ≥930MPa, the tensile strength is ≥1000MPa, and the elongation is ≥10%. This solves the technical problem of cracking in additive forming of high-temperature titanium alloy components with a thickness ratio ≥5, enabling the development of products exceeding 500mm in diameter. This process has promising application prospects in aerospace and other fields.

This invention relates to the field of polymer materials technology, specifically to a method for preparing and applying a rigid polyimide foam reinforced with aluminum honeycomb. The method for preparing the rigid polyimide foam reinforced with aluminum honeycomb provided by this invention includes steps such as surface pretreatment of the aluminum honeycomb core material and fixing the pretreated aluminum honeycomb core material into a molding die. The rigid polyimide foam material reinforced with aluminum honeycomb obtained by this invention not only possesses high specific strength and high specific stiffness, but also inherits the excellent properties of polyimide foam such as high temperature resistance, flame retardancy, low smoke, and thermal insulation. The introduction of the aluminum honeycomb skeleton also improves the material's impact resistance and dimensional stability, making it an ideal multifunctional integrated lightweight structural material with promising application prospects.

The present invention provides a 5-methyluridine producing strain and a construction method and application thereof, wherein the strain utilizes CRIPSR / Cas9 gene editing technology to produce E.coli On the UR12 genome, the artificial promoter P BBa_j23114 Replacement of uridylate kinase gene pyrH The natural promoter of umpH , umpG and no Gene, to ensure bacterial growth while enhancing the accumulation of 5-methyluridine; heterologous introduction and multiple copies of flavin-dependent thymidylate synthase gene thyX , overexpression of alkaline phosphatase gene phoA, Synergistically enhance the 5-methyluridine synthesis pathway; finally, overexpression of the serine hydroxymethyltransferase gene glyA, The supply of CH2-THF, the coenzyme of the key enzyme ThyX, is maintained, and the obtained strain has good genetic stability, high fermentation yield, and can stably produce 5-methyluridine.

The utility model discloses temperable three-silver low-emissivity coated glass with neutral color and low internal reflection. Comprising a glass substrate and a film layer, and the film layer is arranged on the surface of the glass substrate; the film layer sequentially comprises a first silicon nitride layer with the thickness of 20-30 nm, a second zinc oxide layer with the thickness of 10-15 nm, a third silver layer with the thickness of 5-10 nm, a fourth AZO layer with the thickness of 3-5 nm, a fifth silicon nitride layer with the thickness of 30-40 nm, a sixth zinc oxide layer with the thickness of 10-15 nm and a seventh silver layer with the thickness of 10-15 nm from the glass substrate to the outside. The coated glass can simultaneously meet the performance requirements of neutral transmission color, low indoor reflectivity and temperable property, and is suitable for large-scale popularization and application.

This invention relates to the field of polymer materials technology, and discloses a high-elasticity rubber-plastic insulated cable composite material and its preparation method. The high-elasticity rubber-plastic insulation material comprises, by weight, 40-50 parts of EPDM rubber, 20-25 parts of polyolefin elastomer, 30-35 parts of modified calcined kaolin, 3-5 parts of composite antioxidant, 2-3 parts of silane coupling agent, and 1.5-2 parts of vulcanizing agent. During preparation, EPDM rubber and polyolefin elastomer are kneaded for 5-8 minutes, then modified calcined kaolin and silane coupling agent are added and kneaded for another 8-12 minutes, followed by the addition of composite antioxidant and vulcanizing agent and kneading for 3-5 minutes. Finally, the mixture is vulcanized in stages. The first stage vulcanization temperature is 155-160℃, and the second stage vulcanization temperature is 165-170℃. The insulating material prepared by this invention has excellent elasticity, outstanding resistance to flexural fatigue, stable insulation performance, high volume resistivity, excellent aging resistance, and tight interfacial bonding. It is suitable for use in high-voltage cable insulation layers, effectively extending the service life and stability of the cable.

This invention discloses a bimetallic metallurgical composite pipe blank for oil and gas transportation and its preparation method, relating to the technical field of bimetallic metallurgical composite pipe blank preparation. The preparation method includes the following steps: using a low-carbon low-alloy steel outer base pipe with a specific chemical composition and a stainless steel / corrosion-resistant alloy inner liner pipe, after roughening treatment, chemical nickel plating on the inner surface of the outer base pipe, assembly, and hot isostatic pressing treatment with specific process parameters, a metallurgical bonding interface is formed between the low-carbon low-alloy steel outer base pipe and the stainless steel / corrosion-resistant alloy inner liner pipe, which is composed of atomic interdiffusion of the outer base pipe, the nickel layer, and the inner liner pipe. This interface has a high bonding strength of not less than 300 MPa, and is uniform, dense, and defect-free, without continuous oxide films and brittle intermetallic compound layers.

The invention discloses R-T-Si alloy particles, R-T-Si secondary alloy particles and a preparation method and application of the R-T-Si alloy particles and the R-T-Si secondary alloy particles. In the R-T-Si alloy particles, the atomic ratio of the R to the'T and Si 'is (1-1.1): (13-15.5); the atomic ratio of the T to the Si is (4.4-30): 1; wherein R is one or more of rare earth metal elements; t is one or more of iron, manganese, cobalt, nickel, copper, titanium, vanadium and chromium; the average particle size of the R-T-Si alloy particles ranges from 10 micrometers to 1000 micrometers. The R-T-Si alloy particles have the advantages of being high in sphericity degree, smooth in surface and free of obvious defects, and have good magnetocaloric performance when being applied to the field of solid refrigeration.

This invention relates to a polyurethane wet-process resin, its preparation method, and its applications. The raw materials for preparing the polyurethane wet-process resin, by weight, include 216-325 parts of polyester polyol, 65-101 parts of isocyanate, 17-27 parts of chain extender, and 480-722 parts of solvent. The polyester polyol includes adipic acid-1,4-butanediol-ethylene glycol polyester polyol, adipic acid-ethylene glycol polyester polyol, and adipic acid-neopentyl glycol polyester polyol. This invention optimizes the polyurethane molecular chain structure by compounding polyester polyols with different structures, enabling the wet-process resin to possess high peel strength, excellent washability, and superior hand feel. Simultaneously, it maintains good filler compatibility and coating leveling properties under high filler conditions, resulting in excellent processing performance. Wet-process base coats and synthetic leathers prepared using this resin exhibit good film-forming stability, uniform and dense cell structure, good hand feel, and excellent mechanical properties, making them suitable for industrial mass production.

This invention relates to a salt spray resistant and anti-aging curing coating and its preparation method, belonging to the field of coating technology. The coating includes modified epoxy resin, ternary nanocomposite filler, composite light stabilizer, hydrophobic eutectic solvent, polysiloxane-modified aromatic amine curing agent, and bio-based polyurethane curing agent. The modified epoxy resin is prepared by reacting bisphenol F epoxy resin, KH-560 silane coupling agent, and tetrabutylammonium bromide, followed by the addition of bi-terminated epoxy silicone oil, 3,3'-dithiodipropionic acid, and p-toluenesulfonic acid, and then by adding pentaerythritol phosphate and antioxidant 1010. The polysiloxane-modified aromatic amine curing agent is prepared by reacting m-phenylenediamine as a matrix, KH-560 silane coupling agent, diphenylsilanediol, and dibutyltin dilaurate. The bio-based polyurethane curing agent is prepared by reacting castor oil-modified polyol, isophorone diisocyanate, dibutyltin dilaurate, dimethylolpropionic acid, and trimethylolpropane.

The invention provides a preparation method of a high-gradient porous metal film. The prepared high-gradient porous metal film is composed of a porous metal outer film, a transition bonding layer and an internal supporting metal film tube. Through a mold forming process, sol coating and isostatic pressing treatment, a porous metal outer film blank is prepared from metal powder with a small particle size, and then an internal supporting metal film tube prepared from metal powder with a large particle size is put into a mold of the porous metal outer film blank; a cavity is formed between the outer wall of the internal supporting metal film tube and the inner wall of the porous metal outer film blank, then the cavity is filled with a transition bonding layer composed of two kinds of metal powder or metal powder coating slurry with different particle sizes, and the high-gradient porous metal film is prepared after high-temperature heat treatment. The method is simple in process, high in yield, smooth and uniform in film layer surface, high in filtering precision, high in mechanical strength and suitable for industrial application.

The present invention provides a thermal control coating and its application, belonging to the technical field of coatings. The thermal control coating of the present invention comprises the following components in mass percentage: 15-30% resin, 0.5-3% dispersant, 0.5-3% defoamer, 0.5-3% directional arrangement auxiliary agent, 10-40% lamellar wide bandgap filler, 10-40% granular wide bandgap filler and the remainder of solvent; the lamellar wide bandgap filler comprises a lamellar wide bandgap material and a coating layer wrapping the lamellar wide bandgap material. The present invention coats a high refractive index coating layer on the surface of the lamellar wide bandgap material, utilizes the lamellar wide bandgap filler and the granular wide bandgap filler as a reflective medium, combines the particle size of the granular wide bandgap filler, the thickness, diameter and diameter / thickness of the lamellar wide bandgap material, and can produce a thermal control coating with high solar reflectivity under the conditions of low pigment-to-base ratio and thin coating.

This application belongs to the field of high-purity quartz glass preparation technology, and more specifically, relates to a method for preparing a low-hydroxyl synthetic quartz glass masterbatch. This application employs a six-stage integrated composite process, including a powder pre-shrinking homogenization stage, a low-temperature gradient pre-fabrication stage, a medium-temperature gradient equalization and calibration stage, a medium- and high-temperature gradient convergence and cancellation stage, a post-treatment stage, and a final high-temperature transparent sintering stage. Through thermal shrinkage homogenization combined with subsequent chlorine gradient pre-fabrication, equalization, and cancellation in a multi-step manner, the optical defects caused by the chlorine gradient in existing synthetic quartz glass masterbatches are solved, achieving the preparation of a low-hydroxyl, highly uniform, and highly dense transparent synthetic quartz glass masterbatch.

The invention belongs to the technical field of 3D printing manufacturing, discloses a method for additive manufacturing of stainless steel through a metal ceramic matrix, and aims at solving the problem that a traditional metal ceramic matrix composite material possibly has the defects in the aspects of hardness, abrasion resistance and corrosion resistance. Treating again to obtain turbid liquid; mixing the cooled turbid liquid after the reaction with an ethanol intercalation solvent for reaction, and performing ultrasonic treatment to obtain an intercalation solution; putting diethanol amine and the intercalation solution into a high-pressure reaction kettle for treatment, and finally performing suction filtration, water washing and drying to obtain nitrogen-doped graphene; titanium carbide, sulfonylated silicon carbide and nitrogen-doped graphene are put into a mixing machine according to different proportions to be premixed, composite powder is obtained and used for the additive stainless steel manufacturing process, a metal ceramic matrix additive manufacturing stainless steel method is adopted, the prepared 3D finished product is accurate in size, the quality of the finished product is improved, the surface is smooth and flawless, and the product quality is improved. And the hardness and the wear resistance are improved.