Multilayer aluminium sheet for flux-free high temperature brazing in controlled atmosphere
SUBSTANCE: multi-layer sheet for flux-free high temperature brazing comprises an aluminium alloy core coated with intermediate layer of aluminium alloy, and solder of aluminium alloy applied on the intermediate layer. The core is made of 3XXX aluminium alloy containing, wt %: Mn<2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Mg≤2.5, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The intermediate layer is made of aluminium alloy containing, wt %: Mg 0.2-2.5, Mn <2.0, Cu≤1.2, Fe≤1.0, Si≤1.0, Ti≤0.2, Zn≤6, Sn≤0.1, In≤0.1, Zr, Cr, V and/or Sc in total ≤0.2, the rest is Al and unavoidable impurities. The solder is made of an aluminium alloy containing, wt %: Si 5-14, Mg<0.02, Bi 0.05-0.2, Fe≤0.8, Zn≤6, Sn≤0.1, In≤0.1, Cu≤0.3, Mn≤0.15, Sr≤0.05, the rest is Al and unavoidable impurities. The core material and the intermediate layer have higher melting point than the solder, and the intermediate layer is protective relative to the core. The total thickness of the cladding layer consisting of the intermediate layer and solder layer with respect to total sheet thickness is 3-30%. Soldering can be carried out in inert or reducing atmosphere without necessity of for applying the flux.
EFFECT: possibility for soldering complex designs with corrosion potential.
16 cl, 2 tbl
FIELD: metallurgy industry.
SUBSTANCE: invention relates to a brazing sheet of a laminated aluminium alloy and can be used in the manufacture of heat exchangers. The brazing sheet of the laminated aluminium alloy consisting of the material of the base layer, which on one or both sides has an intermediate layer composed of Al-Si brazing solder located between the base layer and a thin coating layer over the intermediate layer. And the material of the base layer and the coating layer has a higher melting point than the Al-Si brazing solder. The coating layer comprises, in weight %: Bi 0.01-1.00, Mg ≤ 0.05, Mn ≤ 1.0, Cu ≤ 1.2, Fe ≤ 1.0, Si ≤ 4.0, Ti ≤ 0.1, Zn ≤ 6, Sn ≤ 0.1, In ≤ 0.1, unavoidable impurities ≤0.05, Al - the rest.
EFFECT: brazing sheet can be soldered in an inert or reducing atmosphere without the need to use the flux that provides the strength of the brazed joint.
24 cl, 1 tbl, 7 ex
FIELD: power industry.
SUBSTANCE: sectional heating radiator includes supply and discharge aluminium headers for heat carrier passage and aluminium tubular sections as heat sinks; the new feature is that external and internal surfaces of heat sinks, as well as internal surfaces of supply and discharge headers are provided with coating from aluminium oxide, which is applied by plasma chemical method; at that, coating thickness of external surfaces of heat sinks is 5…10 mcm, and that of internal surfaces of headers is 20…100 mcm.
EFFECT: increasing radiation coefficient, which allows reducing the surface area of radiators, reducing the number of sections or heat carrier flow rate, reducing corrosion and erosion wear and improving ornamentality without any additional coating.
FIELD: power industry.
SUBSTANCE: plated element for heat exchanger includes core material and one or more layers of side material laminated on one of its sides or both of its sides. Multiple small grooves (B) which are periodic and arc-shaped in longitudinal direction of side material are formed on surface of side material (A). Grooves are spread to external peripheral edge of side material and have curvature radius of 800-1500 mm and period (D) of 1-8 mm in the above direction. Roughness of surface of side material (A) comprises 1-15 mcm as per the average at 10 roughness points (Rz). Side material is made by cutting the ingot into material of the specified thickness and alignment in horizontal position with longitudinal direction of the cut material. Centre of rotating disc device corresponds to ingot centre as to width. Occurrence of bad adhesion between material of core and side material is prevented due to controlling the state of surface and flatness of side material.
EFFECT: improving corrosion resistance of plated element and increasing the heat exchanger obtaining process efficiency.
8 cl, 7 dwg, 1 tbl, 14 ex
FIELD: heat exchange.
SUBSTANCE: cylindrical cooler comprises solid radiator made of an alloy with shape memory effect. The radiator is shaped into a cylinder. The cylinder is preliminary rolled with respect to the axis of rotation in the thermoplastic region by an angle close to the limit one. At a critical temperature, the cylinder is unrolled. The cylindrical shape of the radiator is recovered under the action of thermoelastic force. When the temperature of the cylinder exceeds the critical temperature, the cylinder cools and absorbs the excess of heat.
EFFECT: enhanced efficiency.
SUBSTANCE: invention relates to sheets from aluminium alloys for high temperature soldering, which can be used for the production of radiators. A sheet consists of a core made from an aluminium alloy and a clad material applied to at least one side of the core and made from an aluminium alloy with a lower potential than that of the core material; with that, the clad material represents the outermost layer of the sheet for high temperature soldering and is made from an aluminium alloy containing the following, wt %: 0.8 to 1.3 Mg, 0.5 to 1.5 Si, 1.0 to 2.0, preferably 1.4-1.8 Mn, ≤0.7 Fe, ≤0.1 Cu, and ≤4 Zn, ≤0.3 each of Zr, Ti, Ni, Hf, V, Cr, In, Sn, and ≤0.5 of the sum of Zr, Ti, Ni, Hf, V, Cr, In, Sn, and the rest are Al and inevitable impurities.
EFFECT: invention allows creating thin sheets from the aluminium alloy, which have high strength, good corrosion resistance and pressure processibility.
28 cl, 3 dwg, 7 tbl, 2 ex
SUBSTANCE: this process comprises casing of ingot from 6000-series aluminium alloy, it homogenisation, hot pressing at the rate of outflow of 3.0-30.0 m/min from heated container, heat treatment to solid solution by quenching in water, straightening after quenching by stretching and artificial ageing.
EFFECT: development of high-alloyed Al-Mg-Si system alloy with good mechanical, processing and antirust properties.
5 tbl, 3 dwg
SUBSTANCE: invention relates to an aluminium alloy for making substrates for offset printing plates. The aluminium alloy contains the following components in wt %: 0.2% ≤ Fe≤0.5%, 0.41% ≤ Mg ≤ 0.7%, 0.05% ≤ Si ≤ 0.25%, 0.31% ≤ Mn ≤0.6%, Cu ≤0.04%, Ti ≤ 0.05%, Zn ≤ 0.05%, Cr ≤ 0.01%, the balance - Al and inevitable impurities, each present in an amount of not more than 0.05%, and making up at most 0.15%, overall.
EFFECT: aluminium alloy and an aluminium strip made from an aluminium alloy which is suitable for making substrates for printing plates, having high fatigue resistance when bent across the direction of rotation and high thermal stability without reducing granulation capacity.
7 cl, 4 tbl, 2 dwg
SUBSTANCE: invention relates to the method for manufacturing of a strip, made of alloy of Al-Mg-Si, in which a bar for rolling is cast from alloy Al-Mg-Si, exposed to homogenisation, the bar for rolling heated to temperature of hot rolling, is exposed to hot rolling and then, if required, cold rolling to its final thickness, at the same time the hot strip has temperature of not more than 130°C directly at the outlet from the last stage of hot rolling, preferably the temperature of not higher than 100°C, afterwards the strip is wound at this or lower temperature.
EFFECT: method makes it possible to perform aluminium strips from alloy Al-Mg-Si, which have higher relative extension and accordingly higher extents of deformation when structural metal sheets are made.
15 cl, 5 tbl, 4 dwg
SUBSTANCE: composite material contains copper, manganese, zirconium, iron, silicon and boron, and has a structure consisting of solid aluminium solution and phases uniformly distributed in it at their further ratio in solid solution, wt %: 6-15 B4C, 2-6 Al15(Fe,Mn)3Si2, 2-6 Al20Cu2Mn3, 0.4-0.8 Al3Zr.
EFFECT: increasing heat resistance of material to heating processes at sufficient level of mechanical properties.
2 cl, 1 tbl, 5 ex
SUBSTANCE: magnesium-containing high-silica aluminium alloys intended for use as structural materials, including shapes, bars, sheets and forged pieces, are manufactured with the help of a technological process containing the following operations: ingot casting from the alloy by method of casting into a chill mould, preliminary heating of the ingot in order to disperse particles of eutectic phase of silicon, treatment in thermoplastic condition and thermal treatment in order to produce an item of final shape and with modified microstructure. Aluminium alloys contain, wt %: 0.2-2 of magnesium and 8-18 of silicon and have homogeneous and fine-grained microstructure, at the same time the aluminium matrix is homaxonic with the average size of grain, not exceeding 6 mcm, and particles of silicon and secondary phase are dispersed at the average size of particles not exceeding 5 mcm. Without addition of any modifiers they are produced with low costs by combination of casting into a chill mould with treatment in thermoplastic condition and thermal treatment.
EFFECT: high plasticity and relatively high strength.
8 cl, 13 dwg, 10 tbl, 1 ex
SUBSTANCE: aluminium alloy contains the following components: from 4.5 to 6.5 wt % magnesium, from 1.0 to 3.0% wt % silicon, from 0.3 to 1.0% wt % manganese, from 0.02 to 0.3% wt % chromium, from 0.02 to 0.2% wt % titanium, from 0.02 to 0.2 wt % zirconium, from 0.0050 to 1.6% wt % of one or more rare-earth metals, max. 0.2% iron, and the rest is aluminium.
EFFECT: alloy has high strength properties and is intended for use in die casting and related methods.
8 cl, 1 tbl
SUBSTANCE: aluminium-based alloy contains the following, wt %: zinc - 6.35 - 8.0, magnesium - 0.5 - 2.5, copper - 0.8 -1.3, iron - 0.02 - 0.25, silicon - 0.01 - 0.20, zirconium - 0.07 - 0.20, manganese - 0.001 - 0.1, chrome - 0.001 - 0.05, titanium - 0.01 - 0.10, boron - 0.0002 -0.008, beryllium - 0.0001 - 0.05, at least one element from potassium, sodium, calcium group in quantity of 0.0001 - 0.01 each, aluminium is the rest; at total content of zinc, magnesium, copper within 8.5-11.0, and that of zirconium, manganese and chrome - within 0.1-0.35. Method involves loading and melting of charge components, flux treatment of molten metal, molten metal purification, further vacuum treatment of molten metal in mixer and casting of ingots; boron is added to molten metal in the form of Al-Ti-Be alloy which is distributed at least one hour before molten metal pouring to mixer along the whole surface area of mixer bottom; at that, mixer is pre-heated to temperature which is by 15-30°C more than molten metal temperature, and vacuum treatment of molten metal in mixer is performed at temperature of 695-720°C, during 45-90 minutes.
EFFECT: invention allows obtaining high-strength aluminium alloys with absence of primary intermetallic compounds, decreased content in them of non-metallic inclusions and dissolved gases, with stable properties and optimum size of grain on basis of standard furnace and process equipment.
2 cl, 3 tbl
SUBSTANCE: Invention relates to metallurgy and may be sued in producing strained semi-finished products from thermally non-hardenable welded aluminium-based alloys used as structural and semiconductor material, primarily, in aerospace and nuclear engineering. Aluminium-base alloy comprises the following components in wt %: magnesium - 1.8-2.4, scandium - 0.2-0.4, zirconium - 0,1-0.2, cerium - 0.0001-0.005, iron - 0.01-0.15, silicon - 0.01-0.1, aluminium making the rest. Note here that iron-to-silicon content ratio may not be less than unity.
EFFECT: higher strength and conductivity, hence, reduced weight.
2 tbl, 1 ex
SUBSTANCE: invention refers to deformed thermally hardened high-tensile aluminium alloys Al-Zn-Mg-Cu designed for fabrication of all kinds of deformed semi-finished products, including thin sheets used in aircraft and machine engineering and other branches of industry. Deformed alloy on base of aluminium and an item out of it contain the following components, wt %: zinc 2.5-4.0, magnesium 4.1-6.5, copper 0.2-1.0, iron to 0.25, silicon to 0.15, scandium 0.005-0.3, zirconium 0.005-0.25, nickel and/or cobalt to 0.1, titanium to 0.15, boron and/or carbon to 0.05, at least one element out of group: hafnium to 0.15, molybdenum to 0.15, cerium to 0.15, manganese to 0.5, chromium to 0.28, yttrium to 0.15, vanadium to 0.15, niobium to 0.15, aluminium and unavoidable impurities - the rest, also ratio of Mg contents to Zn contents is more or equal to 1.1.
EFFECT: production of alloy and items out of it possessing raised strength properties at simultaneous increased wear-resistance, reduced rate of crack growth, increased durability of welded connections and reduced density, which results in increased resource and reliability of items operation and in reduced weight of structures.
3 cl, 2 tbl, 1 ex
SUBSTANCE: invention relates to method of production of the multi-layer material for high temperature brazing, and can be used, for example, to manufacture heat exchange sheets. The method ensures core layer out of first aluminium alloy containing in wt %: 0.5-2.0% Mn, < 1.0% Mg, < 0.2% Si, < 0.3% Ti, < 0.3% Cr, < 0.3% Zr, < 0.2% Cu, < 3% Zn, < 0.2% In, < 0.1% Sn, and < 0.7% (Fe+Ni), Al rest and <0.05% each of inevitable admixtures; assurance of the barrier layer out of second aluminium alloy containing in wt %: < 0.2% Mn+Cr, < 1.0% Mg, 1.6-5% Si, < 0.3% Ti, < 0.2% Zr, < 0.2% Cu, < 3% Zn, < 0.2% In, < 0.1% Sn and < 1.5% (Fe+Ni), Al rest, and < 0.05% each of inevitable admixtures; joint rolling of layers; heat treatment at temperature from 300 to 550°C for time period necessary to balance content of Si to 0.4-1% both in core layer, and in barrier layer; rolling of the multi-layer material to final thickness with compression degree from 8 to 33%.
EFFECT: invention increases strength properties, especially creeping and fatigue strength, and corrosion resistance of the multi-layer material.
24 cl, 7 dwg, 4 tbl, 3 ex