35results about How to "Weakened pinning" patented technology

The invention discloses a method for improving the superelasticity of β-titanium alloy, which includes: selecting a bulk β-titanium alloy with shape memory effect as a sample, and determining the martensitic phase transformation favorable amount according to the martensitic phase transformation strain amount of the sample. Orientation; electropolishing the sample; marking the surface of the treated sample; testing and analyzing the treated sample to obtain the grain orientation distribution map of the sample; The trace mark and the grain orientation distribution map of the sample can be used to determine the position of the grain that is conducive to the martensitic transformation; the inside of the grain that is conducive to the martensitic transformation is processed to obtain a micron-sized cylindrical sample. The size of the sample decreases, the size of the martensite decreases, and the martensite is difficult to form and easy to reverse phase transformation, resulting in superelasticity. At the same time, the size of the sample is reduced, the strength of the material is improved, the opening time of the dislocation is delayed, and the pinning effect of the dislocation on the reverse martensitic transformation is reduced, thereby improving the superelasticity of the β-titanium alloy.

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 discloses high-strength, thin-gauge and high-corrosion-resistance steel and a manufacturing method thereof. The high-strength, thin-gauge and high-corrosion-resistance steel comprises, 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, 0.007-0.020% of total oxygen [O]T and the balance Fe and inevitable impurities, meanwhile, the high-strength, thin-gauge and high-corrosion-resistance steel contains one or twoof 0.01-0.08% of Nb and 0.01-0.08% of V, and the Mn / S ratio is greater than 250. According to the manufacturing method, the microalloy elements such as Nb / V and the B element are selectively added into steel, and 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 adopted for casting a cast strip, and the cast strip enters an online rolling mill under the closed condition to be subjected to hot rolling; and after rolling, a gas atomization cooling mode is adopted for cooling the strip steel.

The invention belongs to the technical field of metallurgy, and particularly relates to a preparation method of high-magnetic-induction and low-iron-loss thin-gauge non-oriented silicon steel on the basis of thin-strip continuous casting. Molten steel is prepared from, by mass, smaller than or equal to 0.005% of C, 2.6%-3.2% of Si, 0.005%-0.3% of Mn, 0.1%-0.5% of Al, 0.005%-0.05% of P, smaller than or equal to 0.003% of S, smaller than or equal to 0.003% of N, smaller than or equal to 0.003% of O and the balance Fe and unavoidable impurities, and the thickness of the non-oriented silicon steel ranges from 0.10 mm to 0.20 mm. The preparation method of the non-oriented silicon steel comprises the steps of smelting, thin-strip continuous casting, acid pickling, warm rolling, two-stage cold rolling, finished product annealing and coating treatment. According to the preparation method of the high-magnetic-induction and low-iron-loss thin-gauge non-oriented silicon steel on the basis of thin-strip continuous casting, on the basis of a double-roller thin-strip continuous casting, a conventional cast blank reheating and hot rolling process is eliminated, beneficial {100} and {110}<001> texture in annealed plates is improved by controlling the columnar crystal proportion in cast strips and warm-rolled and cold-rolled reduction, the plate shape and texture uniformity are improved, and the magnetic property is improved. The preparation method is short in technological process and low in energy consumption, and the product is high in magnetic induction and low in iron loss.

A super-abrasion-resistant super-amphiphobic coating and its preparation method and application belong to the technical field of coating preparation. The preparation process is as follows: mix the resin powder, hydrophobic powder and additives, put them into a twin-screw mixer to melt, extrude, press and crush the flakes, grind and sieve the crushed flakes to obtain a powder coating, and disperse the water-based silica sol in In the aqueous solution, add ammonia water for alkali treatment, then add the above solution into the ethanol solution, mix well and then add the hydrophobic modifier, after stirring and standing still, the nano-super amphiphobic coating is obtained, and the powder coating is electrostatically sprayed to obtain the bottom paint coating, and then spray the nano-super amphiphobic coating on the surface of the primer coating to obtain a super wear-resistant super amphiphobic coating. The present invention prepares a surface structure with a large roughness through an electrostatic powder spraying process, and the introduction of a functional topcoat coating can obtain a super-amphiphobic coating with both ultra-high wear resistance and anti-icing performance, which can be applied to the preparation of kitchen equipment, The inner wall of refrigeration equipment or the outer wall of outdoor facilities in cold areas.

The invention relates to an automobile beam steel plate with tensile strength of 750MPa grade and heavy gauge, and a preparation method of the automobile beam steel plate. The steel plate comprises, by mass, 0.03 to 0.12% of C, 0.05 to 0.60% of Si, 0.2 to 1.0% of Cr, 1.0 to 2.5% of Mn, not greater than 0.015% of S, not greater than 0.025% of P, 0.015 to 0.045% of Als, 0.07 to 0.15% of Ti, 0.02 to0.08% of Nb, and the balance being Fe and impurities that are unavoidable during smelting. During preparation, a steel billet adopting the above chemical composition proportion is subjected to reasonable process design, so as to prevent the pickling preparation process from replacing the original process, reduce the thickness of the scale, and obtain the scale complex structure of Fe3O4, FeO and eutectoid Fe3O4 coexisting with alpha-Fe, so that the surface quality of the steel plate is significantly improved, and the requirements of the use of pickling-free direct stamping or roll forming andeliminate the pickling process can be met, production efficiency is improved, environmental pollution is reduced and production cost is reduced.

The invention relates to a low carbon cold-rolled steel sheet for a LED lead frame and a production method thereof, and mainly solves the technical problems that the low carbon cold-rolled steel sheet for the LED lead frame in prior art has nonuniform hardness, high surface roughness and bad aging-resistance. The production method comprises the following steps: smelting according to components, molten iron desulphurization, complex top-bottom blowing converter smelting, argon blowing from bottom of a ladle, protective casting with argon blowing in whole course, heating in a slab heating furnace, rough rolling, finish rolling, reeling for obtaining a hot-rolled steel coil, uncoiling, pickling, cold rolling, annealing in a vertical type continuous annealing furnace, flattening, and reeling for obtaining a finished product with a thickness of 0.4-0.5mm; the finishing temperature of the finish rolling is 860-900 DEG C, the reeling temperature of the hot rolling is 620-660 DEG C, the cold rolling reduction is 75-85%, the temperature scope of a soaking zone of the vertical type continuous annealing furnace for a band steel in hard rolled state after cold rolling is 710-730 DEG C, the soaking time for the band steel in the vertical type continuous annealing furnace is 105-120 s, and temper elongation is 1.0-1.4%. The low carbon cold-rolled steel sheet is mainly used for the LED lead frame.

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.