67results about How to "Reduce pinhole rate" patented technology

The invention relates to a full-ferrite enamel steel for a heat exchanger. The full-ferrite enamel steel comprises the following chemical components in percentages by weight: less than or equal to 0.0050% of C, 0.10-0.50% of Mn, less than or equal to 0.010% of Si, less than or equal to 0.020% of P, 0.015-0.045% of S, less than or equal to 0.010% of Als, 0.010-0.055% of Nb, less than or equal to 0.0030% of B and 0.010-0.050% of O; the production method comprises the following steps of pretreating molten iron, smelting, refining and continuously casting by virtue of a converter; heating the cast blank; carrying out hot rolling; coiling and acid pickling; carrying out cold rolling; annealing; finishing for later use. The microstructure of the enamel steel disclosed by the invention is full ferrite, the grain size of ferrite reaches Grade 11, the main inclusions are long-wire-shaped MnS and granular Mn/Nb composite oxides, the precipitated phases are fine NbC/N and BN particles, Rel is 180-240MPa, the tensile strength is 280-360MPa, the elongation is 36-46%, the hydrogen permeation time of the steel plate is equal to or greater than 25min/mm<2>, no scute burst is caused after enamelling, enamel adhesion strength is greater than A1 level and the pinhole rate is less than 10/m<2>.

The invention discloses a poromeric fire-proof material and preparing method of refined aluminum, which comprises the following parts: 60-92 percent sintered compact calcium hexaluminate, 8-30 percent auxiliary material and 2.5-5.5 percent binder, wherein the auxiliary material is some or all of board-shaped corundum, electric melting white corundum, mild-clay, quartz, kyanite, chromium hemitrioxide green and zircon. The preparing method comprises the following steps: blending poromeric fire-proof material and binder completely; loading the material in the mould; placing the mould on the vibrating platform; pressurizing on the material at 10-20 ton; vibrating at 3-5 mm amplitude at 5-15 s; sintering at 1400-1700 deg.c.

The invention discloses a rare earth-containing aluminium alloy and a preparation method thereof, and belongs to the technical field of aluminium alloy preparation. The rare earth-containing aluminiumalloy is prepared from the following raw materials: titanium, zinc, iron, manganese, copper, carbon, chromium, boron, magnesium, molybdenum, tungsten, vanadium, rare earth elements, a refining agent,sodium pentafluorophenol, a grain refiner and aluminium; the rare earth-containing aluminium alloy is prepared by the steps of melting, refining, slagging-off, casting and the like. By adopting the process of the invention, the tensile strength, the ductility and the corrosion resistance of the aluminium alloy can be remarkably improved.

The invention provides a manufacture process of an automobile power battery enclosure, which comprises the following main steps of: (1) manufacturing aluminum alloy for the automobile power battery enclosure, wherein the aluminum alloy comprises the following components by weight percent: 0.10%<Si<0.60%, 0.40%<Fe<0.70%, 0.05%<Cu<0.20%, Mg<0.05%, 1.05%<Mn<1.25%, 0.15%<RE<0.40%, and 0.05<Ti<0.1, each of other elements is at most 0.05%, the total content of other elements is at most 0.15%, and the balance is aluminum; and (2) smelting the aluminum alloy proportioned by the step (1), casting the smelted aluminum alloy into a billet, and then sequentially carrying out four processes of homogenization, hot extrusion, heat treatment as well as punching and drawing on the billet to manufacture the automobile power battery enclosure. The automobile power battery enclosure manufactured through the process has excellent corrosion resistance, favorable high temperature creep property, and excellent punching-ironing processability and laser welding property, and is suitable for a square-shaped or box-shaped lithium ion battery case.

The invention discloses a spray-formed 7xxx series aluminum alloy containing a rare earth element Er and a preparation method thereof. The spray-formed 7xxx series aluminum alloy containing the rare earth element Er comprises the following specific components in percent by weight: 0.3-0.8% of Er, 3.0-12.0% of Zn, 1.0-4.0% of Mg, 1.5-3.5% of Cu and the balanced of Al. The preparation method comprises the following steps: preparing all elements according to the proportion of the design components of the alloy, melting, casting to prefabricate ingots, re-melting, refining, spraying forming, performing hot extrusion to prepare aluminum alloy tube materials or bar materials, and performing solid solution and aging treatment to obtain aluminum alloy products with excellent strength and elongation. According to the prepared high-strength spray-formed 7xxx series aluminum alloy, due to the added rare earth element Er, on one hand, a melt body is purified, and impurities of solid solution of the alloy are reduced, so that the structure is optimized; on the other hand, grains can be refined, strengthening phases are separated out, the strength of the alloy is improved, the tensile strength of the alloy is 680MPa, and the elongation can be up to 15%.

The invention belongs to the technical field of aluminum alloy production processes, and relates to a high-conductivity 6 series aluminum alloy and a production process therefor. The high-conductivity6 series aluminum alloy is prepared from the following element components in percentage by weight: 0.55%-0.60% of Si, 0.10%-0.15% of Fe, 0.05%-0.08% of Cu, 0.01%-0.02% of Mn, 0.60%-0.65% of Mg, 0.01%-0.02% of Cr, not greater than 0.01% of Ti, 0.05%-0.08% of Zn, not greater than 0.01% of V, 0.15%-0.18% of Gd, 0.015%-0.02% of B, not greater than 0.03% of single impurities, not greater than 0.10% ofimpurities and the balance Al; by improving a formula and the process, the tension strength of the aluminum alloy reaches 250 Mpa, the yield strength reaches 210 Mpa, the percentage elongation afterfracture reaches 16.7%, and the conductivity Gamma is equal to 32.52 MS/m; and the hardness HB is equal to 65, so that the mechanical property and the conductivity of the 6 series aluminum alloy are obviously improved.

The invention discloses an overhead heat-resistance aluminum alloy conductor material and a preparation method thereof, and relates to the technical field of aluminum alloy conductor materials. The overhead heat-resistance aluminum alloy conductor material comprises the following elements in percentage by mass: 0.10-0.45% of zirconium, 0.01-0.10% of yttrium, 0.01-0.10% of scandium, 0.3-1.0% of lanthanum and cerium, 0.05-0.18% of iron, silicon not more than 0.05%, nickel not more than 0.05, magnesium not more than 0.02, zinc not more than 0.04, boron not more than 0.01, and the balance of aluminum and inevitable impurities. The preparation method comprises the following steps: foundry returns, aluminum ingots and Al-Fe intermediate alloy blanks are put in a smelting furnace, are heated for melting, and are transferred into an insulation furnace; then, Al-Zr, Al-Sc, Al-Y and Al-RE intermediate alloys are added for refining and deslagging to prepare fine alloy melts; a continuous casting and continuous rolling process is adopted to firstly pour the fine alloy melts as aluminum alloy castings; and the aluminum alloy castings are leaded into a rolling mill to roll aluminum alloy rods with needed specifications. The aluminum alloy conductor material is high in electric conductivity and excellent in high-temperature resistance; and the preparation method needs no heat treatment, saves the energy consumption, and reduces the production cost.

A thermal treatment process of aluminum foil stock comprises the steps of: carrying out high-temperature homogenizing annealing when an original plate blank is rolled into be 2.0-4.0mm in thickness, wherein the high-temperature homogenizing annealing is realized by three steps: adopting segmented time annealing under the condition being 540-560 DEG C, rolling continuously after the high-temperature homogenizing annealing according to annealing time with different specifications; carrying out intermediate annealing by one time when the aluminum foil stock is rolled to be 0.50-0.70mm in thickness, carrying out annealing treatment by five steps, and determining the temperature time according to specification requirements of a product. The pinhole degree of the aluminum foil produced by using the process disclosed by the invention is smaller than 300/m<2>; the rate of finished products is greater than or equal to 90%; the strength of 0.006mm aluminum foil is 70-90MP, and the surface quality and the metallic luster are uniform.

The invention discloses a preparing method for a rare earth aluminum alloy material good in corrosion-resisting performance and belongs to the technical field of preparing of aluminum alloys. The rareearth aluminum alloy material comprises the following raw materials including aluminum, copper, vanadium, manganese, tin, chromium, rare earth elements, titanium carbide, tungsten carbide, tungsten silicide, tungsten, a refeining agent and a grain refining agent. The rare earth aluminum alloy material is prepared through the steps of melting, refining, drossing, casting and the like. By the adoption of the technology, the corrosion-resisting performance of the rare earth aluminum alloy material can be obviously improved.

The invention discloses a rare earth aluminum alloy, and belongs to the technical field of aluminum alloy preparing. The rare earth aluminum alloy comprises the following raw materials of aluminum, copper, vanadium, manganese, tin, chromium, a rare earth element, titanium carbide, tungsten carbide, tungsten silicide, tungsten, a refining agent and a grain refiner; and the rare earth aluminum alloyis prepared through the steps of fusion, refining, drossing, casting and the like. By means of the process, the strength of extension, the elongation at break and the corrosion resistance of the rareearth aluminum alloy can be obviously improved.

The invention discloses a zinc-aluminum-magnesium alloy wire containing rare earth, and a preparation method and application thereof. The zinc-aluminum-magnesium alloy wire is prepared from the following components: 15 to 40 percent of aluminum, 0.2 to 4.0 percent of magnesium, 0.02 to 0.2 percent of rare earth elements, i.e. cerium and erbium, not larger than 0.025 percent of impurities, and the balance of zinc, wherein the mass ratio of the two rare earth elements i.e. Ce to Er is 3:7 or 7:3. According to the zinc-aluminum-magnesium alloy wire containing the rare earth provided by the invention, the rare earth elements such as the cerium and the erbium are added, so that the corrosion resistance is improved, meanwhile, the zinc-aluminum-magnesium alloy wire has the advantages of high strength, high hardness, low price and the like, and can replace a traditional zinc wire so as to be used for the fields such as spraying anticorrosion engineering, and a zinc-aluminum-magnesium alloy heat coating has an excellent adhesive force, favorable physical and mechanical properties and a corrosion resisting property. The average annual corrosion rate of the zinc-aluminum-magnesium alloy heat coating is larger than the average annual corrosion rates of a heat spraying zinc coating, a zinc aluminum alloy coating, a zinc aluminum pseudo alloy coating and the like, and an anodic protection effect of the zinc-aluminum-magnesium alloy heat coating is remarkably improved compared with the anodic protection effects of aluminum and other aluminum alloy heat spraying metal layers; the whole wire material processing and manufacturing process is simple and convenient, and the cost is lower.

The invention discloses a preparation method for a black low-matte polyimide film. The method comprises the following steps: 1) uniformly dispersing matting powder in an aprotic polar solvent, addinga polyamide acid resin solution into the obtained mixed liquid, heating the obtained material to 80-140 DEG C, and then performing shearing dispersion to obtain a dispersion liquid A, wherein the usage amount of the matting powder is 5-10 times the solid content of the polyamide acid resin solution used in the step; 2) uniformly dispersing carbon black in the aprotic polar solvent to obtain a dispersion liquid B; and 3) adding diamine and dianhydride into the aprotic polar solvent for polycondensation so as to obtain a polyamide acid resin solution, adding the dispersion liquid A and the dispersion liquid B into the polyamide acid resin solution, performing uniform mixing, and then successively carrying out defoaming, tape casting, drawing and thermal imidization so as to obtain the blacklow-matte polyimide film. The film prepared by using the method of the invention has excellent tensile strength and electrical strength, low pinhole ratio and gloss, and more ideal overall performance.

The invention discloses a preparation method of chromium-alloy foamed metal. The preparation method is characterized by the following steps of: selecting materials; chemically degreasing; washing in hot water; washing in cold water; leaching nanometer graphite chromium powder mixed conductive glue; electrically coating a nanometer Al2O3 and nickel composite depositing layer; washing in cold water; drying in air; oxidizing and reducing; leaching ammonium chloride and chromium; and diffusing at high temperature and the like to prepare the chromium-alloy foamed metal product. The preparation method of the chromium-alloy foamed metal has the advantages of being scientific and reasonable, easy to operate, small in raw material consumption, low in cost, free of pollution and the like. The chromium-alloy foamed metal prepared by the preparation method disclosed by the invention is large in thickness and pore diameter range, has a structure the same as that of the polyurethane foam, a large specific surface area, large specific strength, a stable gold-phase structure, good heat resistance and good corrosion resistance and is extensive in application field.

The invention relates to a multi-element zinc-aluminum alloy wire. The multi-element zinc-aluminum alloy wire comprises, by weight percent, 15%-69% of Al, 0.2-3% of Si, 0.1-5% of Mg, 0.01-0.8% of Ce, 0.01-0.2% of Pr, 0.01-0.2% of Nd, not more than 1% of added microelements, and the balance of Zn, wherein the three rare earth elements have a total amount of 0.03-0.92%. The zinc-aluminum alloy wirehas a resistivity of 2.0-6.0 Mu omega/cm, a specific gravity of 3.18-5.69g/cm<3>, and an elongation of 10-25%. The multi-element zinc-aluminum alloy wire is widely applicable to ships, power towers, large storage tanks, underground pipelines and facilities such as tunnel frames, and has broad application prospect.

The invention discloses a device and a method for depositing an oxide film through an atom layer deposition technology. The method comprises the following steps: controlling a third solenoid valve toconduct, and closing after controlling a first solenoid valve to conduct for first preset time length; conducting after controlling the first solenoid valve to close for second preset time length; closing after controlling the first solenoid valve to conduct for the first preset time length; conducting a second solenoid valve after controlling the first solenoid valve to close for the second preset time length; closing after controlling the second solenoid valve to conduct for third preset time length; conducting after controlling the second solenoid valve to close for the second preset time length; closing after controlling the second solenoid valve to conduct for the third preset time length, thereby completing preparation of one layer of oxides, and repeating the preparation process forone layer of the oxides by many times to obtain the oxide film. The method for depositing the oxide film is used for continuously introducing a first precursor into the device for depositing the oxide film twice, and continuously introducing a second precursor twice after adopting nitrogen gas purging, so that a pinhole rate of the deposited oxide film is reduced.

The invention relates to a multi-element zinc-aluminum alloy wire. The multi-element zinc-aluminum alloy wire comprises, by weight percent, 15%-69% of Al, 0.2-3% of Si, 0.1-5% of Mg, 0.01-0.7% of Ce, 0.01-0.2% of Nd, not more than 1% of added microelements, and the balance of Zn, wherein the two rare earth elements have a total amount of 0.02-0.76%. The zinc-aluminum alloy wire has a resistivity of 2.0-6.0 Mu omega/cm, a specific gravity of 3.18-5.69g/cm<3>, and an elongation of 10-25%. The multi-element zinc-aluminum alloy wire is widely applicable to ships, power towers, large storage tanks, underground pipelines and facilities such as tunnel frames, and has broad application prospect.

The invention relates to an a multielement aluminum titanium alloy wire, which comprises the following components in weight percentage: 94-97% of Al; 0.05-1% of V; 2-5% of Ti; 0.01-0.7% of La, and 0.01-0.2% of Pr, wherein the total amount of the two rare-earth elements is 0.02-0.76%, the total amount of trace additional elements is not greater than 1%, the resistivity of the aluminum titanium alloy wire is 2.0-6.0 muomega*cm, the specific weight of the aluminum titanium alloy wire is 2.60-2.75g/cm<3>, and the percentage elongation of the aluminum titanium alloy wire is 10-25%.

The invention discloses rare-earth modified aluminum alloy materials and an application thereof, and belongs to the technical field of aluminum alloy preparation. The rare-earth modified aluminum alloy materials comprise, by mass, 1200-1850 parts of aluminum, 12-19 parts of copper, 5-8 parts of vanadium, 2-6 parts of manganese, 4-8 parts of tin, 1-3 parts of chromium, 20-38 parts of rare earth elements, 10-15 parts of titanium carbide, 8-12 parts of tungsten carbide, 7-9 parts of tungsten silicide, 3-5 parts of tungsten, 15-20 parts of refining agents, and 26-35 parts of grain refiners. The rare-earth modified aluminum alloy materials are prepared through the steps of melting, refining, slagging off, casting and the like. The rare-earth modified aluminum alloy materials are applied to aluminum alloy cables so that the tensile strength, the elongation at break and the corrosion resistance can be remarkably improved.