35results about How to "Weakened pinning" patented technology

The invention relates to a super-wear-resistant and super-amphiphobic coating as well as a preparation method and application thereof, belonging to the technical field of coating preparation. The preparation process comprises the following steps: mixing resin powder, hydrophobic powder and an auxiliary agent, then putting the obtained mixture into a twin-screw mixer for melting and extruding, and then tabletting and crushing; grinding the crushed the sheets, and sieving to obtain a powder coating; dispersing aqueous silica sol into an aqueous solution, adding ammonia water for carrying out alkalization treatment, then adding the solution into an ethanol solution, mixing uniformly and then adding a hydrophobic modifier, stirring and standing to obtain a nano-super-amphiphobic coating; electrostatically spraying the powder coating to obtain a primer coating, and then spraying the nano-super-amphiphobic coating onto the surface of the primer coating to obtain the super-wear-resistant and super-amphiphobic coating. According to the preparation method provided by the invention, a large roughness surface structure is prepared by means of an electrostatic powder spraying process; due to the introduction of the functional finish coating, the super-amphiphobic coating with ultra-high wear resistance and anti-icing performance can be obtained; the super-wear-resistant and super-amphiphobic coating can be applied to preparation of kitchen utensils and equipment, inner walls of refrigeration equipment or outer walls of outdoor facilities in cold areas.

The invention relates to a preparation method of a quincuncial pile network distribution ceramic/metal composite material, and belongs to the technical field of metal-based composite material. A plurality of grooves are formed in a metal mesh through pressing. Then, ceramic particles are filled in the grooves of the metal mesh, and a sand casting mould is prepared according to the shape of the quincuncial pile network distribution ceramic/metal composite material to be prepared. The metal mesh filled with the ceramic particles is arranged on the upper surface of the mould cavity of the sand casting mould. Then a smelt metal substrate is poured in the sand casting mould. After the metal substrate is cooled, the metal substrate is stripped from the sand casting mould, and then the product is obtained. The preparation method can be used for effectively solving the problem on manufacturing a prefabricated body of ceramic particles and ensuring the uniform distribution of the ceramic particles in the metal substrate. All recombination regions are not connected with one another, and also can play a role of macroscopical shadow effect so as to strengthen the abrasion resistance, so that the abrasion of the metal substrate can be avoided, and the falling problem of a surface composite material can be solved effectively.

The invention provides a method for improving coercive force of neodymium iron boron quick-quenching nanocrystalline magnetic powder. The method comprises the following steps that a, powder suspension liquid with low-melting-point alloy is prepared, and the weight ratio of the powder to a solvent is 1:1 to 1:10; b, the neodymium iron boron quick-quenching nanocrystalline magnetic powder prepared through a common method and the suspension liquid are mixed to be fully stirred, the powder in the suspension liquid evenly covers the particle periphery of the neodymium iron boron quick-quenching nanocrystalline magnetic powder, and the neodymium iron boron quick-quenching nanocrystalline magnetic powder is filtered out and dried in a vacuum manner; c, under the vacuum or atmosphere condition, heat treatment is carried out on the neodymium iron boron quick-quenching nanocrystalline magnetic powder treated in the step b, and the heat treatment is carried out for 5 minutes to 30 minutes at the temperature of 500 DEG C to 800 DEG C; and d, water quenching or oil quenching rapid cooling treatment is carried out on the neodymium iron boron quick-quenching nanocrystalline magnetic powder obtained after heat treatment. Through the method, the coercive force of the obtained magnetic powder is improved, and magnetizing becomes easy.

The invention discloses a martensitic steel strip and a manufacturing method thereof. The martensitic steel strip is prepared from the components in percentage by weight: 0.16-0.26% of C, 0.1-0.5% ofSi, 0.4-1.7% of Mn, less than or equal to 0.02% of P, less than or equal to 0.007% of S, 0.004-0.010% of N, less than 0.001% of Als, 0.001-0.006% of B, 0.007-0.020% of total oxygen [O]< T>, and the balance of Fe and inevitable impurities; the conditions that Mn/S is greater than 250, and one or two of 0.01-0.08% of Nb or 0.1-0.4% of Mo are included need to be met at the same time. Nb, Mo and B elements are selectively added; the alkalinity of slag, the type and melting point of inclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled in the smelting process. According to the martensitic steel strip and the manufacturing method thereof, the yield strength of the martensitic steel strip is 700-1200 MPa, tensile strength is 1000-1800 MPa, elongation is 3-12%, the martensitic steel strip can be widely applied to the field of high-strength automobile steel, and a wide space is provided for the automobile industry in the aspects of light weight, energy consumption reduction and fuel economy improvement.

The invention discloses a thin-gauge riffled plate/strip and a manufacturing method thereof. Microalloy elements such as B are selectively added into steel; the alkalinity of slag, the type and melting point of inclusions in the steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled in the smelting process; then, double-roller thin-strip continuous casting is carried out to cast strip steel with the thickness of 1.5-3 mm, and the strip steel directly enters a lower closed chamber with a non-oxidizing atmosphere after being discharged out of crystallization rollers and enters an online rolling mill under the closed condition to be subjected to hot rolling; and the rolled strip steel is cooled by adopting a gas atomization cooling mode,and the gas atomization cooling mode can effectively reduce the thickness of surface scale of the strip steel, improve the temperature uniformity of the strip steel and improve the surface quality ofthe strip steel. A finally produced steel coil can be directly used as a hot-rolled riffled plate/strip, can also be used as a finished riffled plate/strip after being trimmed and leveled, and can bewidely applied to the fields of buildings, machine manufacturing, automobiles, bridges, traffic, shipbuilding and the like.

The invention discloses boron-containing high-reaming steel and a production method thereof. The steel comprises the following chemical components of, in percentage by weight, 0.01%-0.05% of C, 0.2%-0.6% of Si, 0.8%-1.5% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S, less than or equal to 0.008% of N, less than 0.001% of Als, less than or equal to 0.0050% of Ca, 0.001%-0.006% of B, 0.007%-0.020% of total oxygen [O]T, Mn/S is large than 250 and the balance Fe and inevitable impurities. According to the steel, microalloy elements such as B are selectively added intothe steel; in a smelting process, the alkalinity of slag, a type and a melting point of an inclusion in steel, a content of free oxygen in molten steel and a content of acid-soluble aluminum Als are controlled; then, double-roller thin strip continuous casting is carried out to cast a cast strip with a thickness of 1.5-3 mm, and the cast strip directly enters a lower closed chamber with a non-oxidizing atmosphere and enters an online rolling mill for hot rolling under the closed condition; and after rolling, strip steel is cooled in a gas atomization cooling mode, and a produced steel coil canbe directly used as a hot rolled plate and can also be used after being subjected to acid pickling and leveling.

The invention relates to a thin hot-rolled steel plate/strip for sulfuric acid dew point corrosion resistance and a production method thereof. Residual Sn, Cu and other elements in scrap steel are used fully to smelt molten steel, and Cr, Ti, Sb and other microalloy elements and B element are selectively added into the steel. The production method comprises the steps of: in a smelting process, controlling the alkalinity of slag, the type and melting point of inclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als; and then casting a cast strip through double-roller thin strip continuous casting, feeding the cast strip into an on-line rolling mill for hot rolling under a closed condition, cooling strip steel in a gas atomization cooling mode after rolling, and finally conducting coiling. The steel disclosed by the invention can be widely applied to the field of products with sulfuric acid dew point corrosion resistance requirements inuse environments such as tobacco baking equipment, air preheater heat exchange elements, conveying pipelines, flues, chimney manufacturing structural parts, boiler preheaters and economizer equipmentin industries of petroleum, chemical engineering, electric power, metallurgy and the like.

The invention discloses high-corrosion-resistance steel and a manufacturing method thereof. The high-corrosion-resistance steel is prepared from the chemical components in percentage by weight: 0.02-0.06% of C, 0.1-0.5% of Si, 0.4-1.7% of Mn, less than or equal to 0.02 % of P, 4.0-6.0% of Cr, 1.0-3.0% of Ni, less than or equal to 0.007% of S, 0.004-0.010 % of N, less than 0.001% of Als, 0.001-0.006% of B, greater than 250 of Mn/S, 0.007-0.020% of total oxygen [O]<T>, and the balance of Fe and inevitable impurities. Alloying elements such as Cr and Ni and an element B are selectively added intoplain carbon steel; the alkalinity of slag, the type and melting point of inclusions in steel, the content of free oxygen in molten steel and the content of acid-soluble aluminum Als are controlled in the smelting process; double-roller thin strip continuous casting is adopted for casting a cast strip, the cast strip directly enters a lower closed chamber with a non-oxidizing atmosphere and enters an online rolling mill for hot rolling under a closed condition, and strip steel is cooled in a gas atomization cooling mode after rolling.

The invention discloses a method for obtaining a GH4169 alloy ultra-fine grain forging. The method includes the following steps that (1), a GH4169 forging stock is subjected to solution treatment andaging treatment in sequence, and a uniform structure with a certain quantity of delta phases is obtained; (2), the forging stock obtained after solution treatment and aging treatment is subjected to forging deformation, the deformation temperature is controlled with 950 DEG C-1,010 DEG C, the strain rate is not smaller than 0.05s<-1>, and the equivalent strain is not smaller than 0.35; (3), the obtained forging is subjected to aging treatment again, the aging temperature is controlled within 880 DEG C-920 DEG C, and the aging time is 9 h-24 h; and (4), the forging is subjected to recrystallization heat treatment in a continuous cooling manner, the cooling initial temperature is controlled within 990 DEG C-1,030 DEG C, the cooling rate is 1 DEG C/min-3 DEG C/min, and the cooling final temperature is controlled within 950 DEG C-990 DEG C. By means of the method, the GH4169 alloy ultra-fine grain forging can be obtained, and an effective way is provided for manufacturing high-quality forgings.

The invention discloses an ultrasonic-enhanced magnetic powder core compression molding method and a compressed powder magnetic core. The invention discloses an ultrasonic enhanced magnetic powder core compression molding method which comprises the following steps: placing soft magnetic powder (coated) in ultrasonic compression molding equipment, setting the ultrasonic frequency to be 15-60kHz and the vibration amplitude to be 70-90%, and simultaneously starting a pneumatic system to pressurize, wherein the pressure is 0.3-0.9 MPa, the compression time is 0.1-10s and the dwell time is 3-5s, and completing the compression molding of a magnetic powder core. The method/process has the advantages of being small in required pressure, short in completion time, high in powder forming density, simple and efficient. The invention further discloses the magnetic powder core prepared by the ultrasonic enhanced magnetic powder core compression molding method, the magnetic powder core has high saturation flux density, low iron loss and high initial magnetic conductivity, and the magnetic conductivity of the magnetic powder core shows good high-frequency stability.

The invention discloses a multilayer composite structure rare earth barium copper oxygen superconducting film and a preparation method thereof. The preparation method comprises the steps that REBa1+xCuO7-y films and metal layers are alternately deposited on a substrate; a formed superconducting film is expressed as (REBa1+xCuO7-y/M)n, wherein RE is a rare earth element and M represents a metal layer; x is between 0.5 and 1, and y is greater than 0 and less than 0.5; REBa1+xCuO7-y is coated with a chemical solution; a precursor used by the coating of the chemical solution contains the salt of rare earth metal, barium and copper; each metal layer is subjected to physical vapor deposition; and heat treatment is carried out to acquire the multilayer composite structure rare earth barium copperoxygen superconducting film. The preparation method provided by the invention can be used to acquire the superconducting film of high quality and high critical current density.