866 results about "Artificial aging" patented technology

The invention relates to a high temperature resistant anticorrosion coating based on graphene and a preparation method thereof. The high temperature anticorrosion coating comprises the following components by the mass percentage: 5-60% of epoxy resin, 3-30% of polyphenylene sulfide resin, 3-30% of amino resin, 1-10% of a pigment, 1-20% of graphene, 3-50% of n-butyl alcohol, 0.1-0.3% of a defoaming agent, 0.1-10% of polyhydroxy acid sodium salt, 0.1-5% of benzenedicarboxylic acid dibutyl ester, 0.5-1.0% of bentonite, and 0.2-0.5% of a leveling agent. Compared with the prior art, the prepared coating has the advantages of quite excellent waterproof and anticorrosion performance, high temperature resistance, weather resistance, alkali resistance, impact resistance, artificial aging resistance and the like, and the preparation method has the advantages of good controllability, simple operation, low production cost, and easy industrialized production.

A 7XXX series aluminum alloy having reduced quench sensitivity suitable for use in aerospace structural components, such as integral wing spars, ribs, extrusions and forgings comprises, in weight %: 6 to 10 Zn, 1.3 to 1.9 Mg, 1.4 to 2.2 Cu, wherein Mg<=Cu+0.3, one or more of 0 to 0.4 Zr, up to 0.4 Sc, up to 0.2 Hf, up to 0.4 Cr, up to 1.0 Mn and the balance Al plus incidental additions including Si, Fe, Ti and the like plus impurities. By controlling the Mg content to 1.3 to 1.7 wt. %, limiting Mg<=Cu+0.3 and 6.5<=Zn<=8.5, the alloy provides significantly improved combined strength and fracture toughness in heavy gauges. For example, in a six-inch thick plate there is provided a combination of about 75 ksi quarter-plane tensile yield strength (L) with a fracture toughness (L-T) of about 33 ksi{square root}in which progresses by artificial aging/tempering to a combined strength and fracture toughness of about 67 ksi tensile yield strength (L) and a fracture toughness (L-T) of about 40 ksi{square root}in. The alloy product possesses equally attractive combinations of strength and fracture toughness when intentionally quenched slowly following solution heat treatment so as to lessen dimensional distortion, particularly in shapes of varying cross section.

The invention discloses a magnesium alloy and a method for preparing the same. The weight percentage compositions of the magnesium alloy as follows: 7 to11 percent by weight of Gd, 2 to 5 percent by weight of Y, 0.3 to 0.6 percent by weight of Zr, 0 to 1.0 percent by weight of Zn, the balance Mg and incidental impurity elements. The method for preparing the alloy comprises alloy melting, refining, casting, solid solution, extrusion deformation and two artificial aging methods, to produce heat resistant magnesium alloy extruded bar with high strength and high toughness. The tensile properties of the magnesium alloy at room temperature manufactured by adopting direct artificial aging is: tensile strength sigma b is between 450 and 480 MPa, sigma 0.2 is between 390 and 425 MPa, delta 5 is between 3 and 5 percent; when test specimen is heated to 250 DEG C for 10 min, the tensile strength sigma b is more than or equal to 300 MPa. The tensile properties of the magnesium alloy at room temperature manufactured by adopting dual artificial aging is: tensile strength sigma b is between 380 and 395 MPa, sigma 0.2 is between 280 and 290 MPa, delta 5 is between 15 and 21 percent; when test specimen is heated to 250 DEG C for 10 min, the tensile strength sigma b is more than or equal to 260 MPa. The invention produces the heat resistant magnesium alloy of high strength and high toughness with the density of no more than 1.93g/cm3, which can satisfy the demands of density, strength and toughness, and heat resistance of metal materials in specific fields.

The invention discloses an extruding processing technology of an aluminium alloy tubing with large diameter. The method comprises steps of a. proportioning, b. casting, c. uniformization, d. surface treatment on casting rod, e. casting rod heating, f. extrution, g. on-line quenching, h. stretching, i. artificial aging and j. straightening, etc. Strict control on each parameter can solve problems of extruding production of tubing with large diameter, eliminate disadvantages of long production period, low production efficiency, high energy consumption, huge environmental pollution and expensiveauxiliary equipment of rolling and drawing, save cost, simplify arrangement of auxiliary equipment and further reduce failure rate of an apparatus. The energy consumption of the present invention is merely 1/4 that of rolling and drawing, and water consumption is 1/ 8 that of a steam jet pump set; therefore, the invention brings obvious economic effects.

The invention discloses aluminum alloy and an aluminum alloy extruded profile machining method. The aluminum alloy comprises, by weight, 0.6-1.4% of Si, 0.7-1.3% of Mg, 0.1-1% of Cu, 0.1-1% of Mn, 0.01-0.15% of Ti, 0-0.2% of Zr, 0-0.5% of Cr, 0-0.4% of Fe, 0-0.25% of Zn and the balance Al. The aluminum alloy also meets the requirements that the weight percentage range of Mg+Si+Cu is 1.4-3.7%, themole ratio of Mg to Si is 0.7-1.5, and the weight percentage range of Mn+Cr+Zr is 0.1-1.5%. The machining method comprises the steps that (1) a cast ingot of the alloy is subjected to homogenization treatment; (2) the cast ingot is extruded into aluminum profile; (3) extrusion production is conducted; (4) on-line quenching is conducted; (5) tension leveling is conducted; and (6) artificial aging is adopted. According to the aluminum alloy and the aluminum alloy extruded profile machining method, the technology is simple, and the production cost is low.

The invention relates to preparing of aluminum alloy sectional bars, in particular to a preparing method for a 6-series aluminum alloy sectional bar. The extrusion technology sequentially comprises the steps of ingot selecting, ingot heating, extruding, roller bottom continuous solid solution quenching, tension leveling, finished product saw cutting, sampling, gaging, framing, artificial aging and packaging warehousing. The control process of the technology is finer, the aluminum alloy obtained through the extrusion procedure is good in mechanical performance, the uniformity of the sectional bar is good, and the aging production efficiency can be improved.

The invention discloses a low pressure casting process for an aluminum alloy cylinder part. The aluminum alloy used by the method comprises the following materials in percentage by mass: 6.0 to 7.0 percent of Si, 0.3 to 0.5 percent of Mg, 0.1 to 0.2 percent of Ti, 0.05 to 0.15 percent of Fe and the balance of Al. After melting, thining, modification, and refining, the materials are subjected to low pressure casting and pouring; and after low pressure casting process of liquid lifting, filling, pressure maintaining and pressure releasing, the materials form a cast in a die cavity; and after a cast blank is subjected to solution treatment, and heat treatment of incomplete artificial aging, the cast has the advantages that: the texture is compact, casting defects such as pores, shrinkage porosity, shrinkage cavity, slag inclusion, and the like are avoided, the quality of the cast is improved; meanwhile, the working allowance of the cast is less, so the material utilization is improved and the production cost is reduced.

Aluminum alloy products about 4 inches thick or less that possesses the ability to achieve, when solution heat treated, quenched, and artificially aged, and in parts made from the products, an improved combination of strength, fracture toughness and corrosion resistance, the alloy consisting essentially of: about 6.8 to about 8.5 wt. % Zn, about 1.5 to about 2.00 wt. % Mg, about 1.75 to about 2.3 wt. % Cu; about 0.05 to about 0.3 wt. % Zr, less than about 0.1 wt. % Mn, less than about 0.05 wt. % Cr, the balance Al, incidental elements and impurities and a method for making same. The invention alloy is useful in making structural members for commercial airplanes including, but not limited to, upper wing skins and stringers, spar caps, spar webs and ribs of either built-up or integral construction. The invention alloy may be aged by 2 or 3 step practices while exceeding the SCC requirements for applications for which the invention alloy is primarily intended. The flexibility of the invention in this regard is useful for its application in multi-alloy or multi-material systems joined by welding or bonding and subsequently aged.

The invention discloses a high-plasticity cast aluminum alloy and an extrusion casting preparation method thereof, belonging to the technical fields of metal materials and metallurgy. The alloy comprises the following components in percentage by weight: 7.5-13.5% of Si, 0.5-0.8% of Mg, 0.2-0.5% of Mn, 0.1-0.4% of Ti, 0.01-1.5% of RE, 0.6-1.3% of Fe, at most 100 ppm of P, 100-600 ppm of Sr and the balance of Al. The RE is one or more of Gd, Y, Nd, Sm, Er, Yb and La. After the high-plasticity cast aluminum alloy is subjected to extrusion casting and solid solution+artificial aging treatment, the elongation percentage delta of the alloy is greater than or equal to 22%. The alloy has the advantages of excellent casting performance and low cost. The method has the advantages of simple technique, high production efficiency and obvious progress, and widens the application range of the Al-Si cast aluminum alloy.

An aluminum alloy profile for an automobile connection plate and a manufacturing method thereof, relating to the technical field of preparation of an aluminum alloy profile, the method for manufacturing an aluminum alloy profile for an automobile connection plate comprises the following steps: alloy smelting, refining treatment, casting into rods, casting rods Sawing, homogenizing annealing, peeling of cast rod surface, casting rod heating, extrusion, online quenching, stretching and straightening, sawing of finished products, artificial aging, this manufacturing method strictly controls the parameters in the process steps, and can be mass-produced The size of each wall is qualified and has good mechanical properties, which meets the strength requirements of aluminum alloy materials for automobile connection plates; the prepared aluminum alloy profiles for automobile connection plates can be specially used to produce automobile connection plates, which can reduce the occurrence of unqualified rates. Improve production efficiency and reduce manufacturing costs.

The invention provides a high-strength and high-Gd-content deformed magnesium alloy and a preparing method thereof. The magnesium alloy comprises the following elements of Mg, Gd, Zn and one or more kinds of Y, Zr and Mn. The preparing method includes the following steps that a magnesium alloy cast ingot high in Gd content is prepared; after the magnesium alloy cast ingot is subjected to two steps of T4 solution treatment, quenching is conducted at the temperature ranging from 80 DEG C to 100 DEG C, and a T4-state magnesium alloy cast ingot is obtained; the T4-state magnesium alloy cast ingot is subjected to different-temperature extrusion forming and is then quenched at the temperature ranging from 15 DEG C to 30 DEG C, and a bar or plate is obtained; and the bar or plate is subjected to cold rolling and cold drawing deformation at the room temperature, then artificial aging is conducted, and a T10-state deformed magnesium alloy, namely the high-strength and high-Gd-content deformed magnesium alloy is obtained. According to the high-strength and high-Gd-content deformed magnesium alloy and the preparing method thereof, the preparing technology is simple, the performance is stable, the success rate is high, the production efficiency is high, and the high-strength and high-Gd-content deformed magnesium alloy and the preparing method thereof are easily applied to industrial production.

The invention relates to a 6XXX aluminum alloy and a machining method thereof. The alloy comprises the following components: 0.7-1.3 wt% of Mg, 0.7-1.3 wt% of Si, 0.5-1.2 wt% of Cu, Mn not more than 0.10 wt%, Cr not more than 0.10 wt%, Zr not more than 0.10 wt%, Ti not more than 0.10 wt%, Zn not more than 0.50 wt%, Fe not more than 0.20 wt%, and the balance of Al and inevitable impurities. The machining process of the aluminum alloy comprises the following steps: firstly, a cast rod is cast, is uniformly heated from room temperature to 500-540 DEG C with the heating speed of 20-300 DEG C/h for keeping 10-20 hours, is heated to 545-570 DEG C with the speed of 10-100 DEG C/h for keeping 6-30 hours, and is quickly cooled; the material is extruded after preheating, is cooled in water online, is quenched, and is straightened; and finally, the artificial aging is performed. As the content of elements in the 6XXX aluminum alloy is reasonably adjusted, the material both has higher strength and better anodic oxidization effect; and the alloy material is an ideal material for manufacturing an outer part of an electronic product, and is broad in market application prospect.

The invention provides a novel Al-Mg-Si-Cu-Zn series alloy with fast aging response and a preparation method thereof. According to the invention, the novel Al-Mg-Si-Cu-Zn series alloy shows excellent fast aging response characteristic in an aging process by sufficiently utilizing the synergetic precipitation effect and synergetic strengthening effect of the main strengthening phases Mg2Si, MgZn2 and transitional phase of an Al-Mg-Si series alloy and an Al-Zn-Mg-Cu series alloy; the natural aging deterioration effect of a common Al-Mg-Si-Cu series alloy is certainly inhibited due to the simultaneous addition of Mg, Si, Cu and Zn elements and the addition of element Zn especially, the novel Al-Mg-Si-Cu-Zn series alloy has low strength and high room temperature stability after being subjected to preaging treatment at a certain temperature, which is favorable to the subsequent stamping forming of an alloy plate; a preaging-state alloy is greatly enhanced in strength after being subjected to high-temperature aging treatment and achieves the highest strength increment approaching to 150 MPa far higher than that of the traditional AA6016 and AA6111 alloys through short-term artificial aging at 185 DEG C for 20 minutes; the fast aging response characteristic is not only suitable for the preparation of an automobile outside plate, but also suitable for the related field with a special requirement on the aging precipitation speed of the alloy plate.

The invention relates to a heat treatment process of large-size high-tensile magnesium alloy extrusion. The magnesium alloy extrusion comprises the components in percent by weight of 6 to 13 percent of Gd, 2 to 6 percent of Y, 0.3 to 0.8 percent of Zr, and the balance of Mg and unremovable impurity elements. The heat treatment process comprises the steps of: homogenizing magnesium alloy ingots semicontinuously casted at a temperature of 445 to 455 DEG C for 5 h and at a temperature of/535-545 DEG C for 15h; extruding and moulding the homogenized magnesium alloy ingots to obtain large-size extrusion boards and bars, and carrying out artificial aging treatment on the extrusion boards at a temperature of 200 to 220 DEG C for 20-64h. The strength of the magnesium alloy is greatly improved. The tensile strength of the extrusion boards subjected to artificial aging is more than 460Mpa, and the yield strength is more than 390Mpa. The tensile strength of the bars subjected to the artificial aging is more than 455Mpa, and the yield strength is more than 400Mpa.

The object of the invention is a rolled, forged or extruded aluminum alloy product more than 12 mm thick, heat treated by solutionizing, quenching and artificial aging, with a microstructure characterized by the following parameters: the fraction of recrystallized grains measured between one-quarter thickness and mid-thickness of the final wrought product is smaller than 35% by volume; the characteristic intercept distance between recrystallized areas is greater than 250 mum, preferably greater than 300 mum and most preferably greater than 350 mum.

The invention relates to a granite mineral varnish, which is prepared by raw material according to the following percentage by weight, water-based resin 10-25 parts, film forming additive 1-3 parts, propylene glycol 0.5-2 parts, mildew preventive 0.1-0.5 parts, defoaming agent 0.1-0.3 parts, color quartz sand 60-80 parts, color compound rock slices 8-30 parts and thickening agent 0.5-2 parts. The process for preparing the granite mineral varnish of the invention comprises the following steps: adding water-based resin, film forming additive, propylene glycol, mildew preventive, defoaming agent and thickening agent into a dispensing tank according to proposition, adding color quartz sand after evenly stirring, and then evenly stirring, adding color compound rock slices, and obtaining granite mineral varnish end products after evenly stirring. The granite mineral varnish has the advantages that first, excellent simulation effect, no matter near viewing or remote viewing, textures are lively, which has no difference with natural granite mineral varnish, second, excellent anti-fouling performance, third, big binding strength, fourth, excellent artificial aging (more than 800h), fifth, simple construction, only single-gun single-hole is needed, and the single gun is colorful.

The present invention relates to a work-hardened product, and particularly a rolled, extruded and/or forged product made of an alloy with composition (% by weight): Zn 6.7-7.3% Cu 1.9-2.5% Mg 1.0-2.0% Zr 0.04-0.15% Fe ≦0.15 Si ≦0.15 other elements ≦0.05 each and ≦0.15 total, remainder aluminium and wherein Mg/Cu<1. The product is preferable treated by solution heat treatment, quenching, cold working and artificial aging. Cold working may be achieved by controlled tension and/or cold transformation, for example rolling or drawing. The product may be used, for example, as an aircraft structural member.

The invention discloses a process for avoiding coarse-grain rings of 6061 aluminum alloy bars and rods, and belongs to the technical field of aluminum alloy machining. The process includes the steps of alloy component optimization, cast bar heating, the extrusion process, online quenching, stretch flattening and artificial aging. Chemical components of optimized alloy components include 0.60-0.65% of Si, 0.20% of Fe, 0.19-0.24% of Cu, 0.05-0.10% of Mn, 0.90-0.95% of Mg, 0.25-0.30% of Cr, 0.15% of Zn, 0.10% of Ti, 0.15% of other substances, and the balance Al. Double-hole die extrusion is adopted for the extrusion process. By means of the process, extruded aluminum alloy products can be free of coarse-grain ring tissue defects, the mechanics, fatigue and other physical performance of materials are greatly improved, the bearing capacity and use safety of materials are improved, the service life of materials is prolonged, and use risks of materials are reduced.

The invention relates to a process method for improving the manufacturing accuracy of an aluminum-alloy open-type integral impeller. The method comprises the concrete steps of preparing materials, carrying out rough-turning on impeller blank shape, carrying out rough-turning on a process gripping head, carrying out heat treatment, carrying out artificial aging, carrying out semi-fine-turning on the process gripping head, carrying out semi-fine-turning on impeller shape, carrying out low-temperature treatment, carrying out five-axis-linkage-machining rough-milling, carrying out natural aging, carrying out five-axis-linkage-machining fine-milling, gripping, carrying out fine-turning on an axle hole, carrying out fine-turning on an impeller, gripping and carrying out dynamic balance. The impeller manufactured by adopting the process method provided by the invention has the characteristics that the shape is complete, the curved face is smooth and unhindered, blade curved faces and flow passage curved faces are low in deformation, and shown by the results of a fluorescent flaw detection, blade surfaces and front edges of the blades are flawless; during the dynamic balance of the integral impeller, mass reduction is relatively low, the qualified rate is high, and the qualified rate of excess-revolution tests of the integral impeller is greatly increased; the improvement of process for the series of integral impeller parts is realized, and good product quality, performance and design requirements are guaranteed; meanwhile, the stability of production quality is improved, and the reliability of products is improved.

The invention discloses a processing process of a piston cylinder sleeve, comprising the following steps of: a, roughly boring an inner hole; b, roughly turning a small end surface and an excircle; c, roughly turning a large end surface; d, carrying out artificial aging; e, half finely boring the bored inner hole; f, half finely turning the excircle and the small end surface; g, finely turning the small end, and chamfering; h, half turning a hole; j, finely turning the excircle and the large end surface; k, finely grinding the hole; L, detecting; m, drilling; n, reaming the hole, and chamfering; o, tapping; and p, burring and chamfering an orifice. The processing process of the piston cylinder sleeve has the advantages of high processing accuracy, strict process flow and higher quality of processed products.

The invention relates to a manufacturing process of an ultra-long blade complex curved surface integral impeller made of an aluminum alloy material. The manufacturing process includes the specific steps of preparing materials, conducting rough machining on the profile of an impeller workblank, conducting heat treatment, conducting artificial aging, conducting semifinishing on the profile of the impeller, conducting ice-cold treatment, drilling a positioning hole, conducting five-axis linkage rough machining, conducting natural aging, conducting five-axis linkage finish machining, conducting clamp treatment, conducting numerical control turning, conducting linear cutting, conducting clamp treatment and conducting dynamic balancing. By the adoption of the process technology method, the ultra-long blade complex curved surface integral impeller made of the aluminum alloy material is manufactured, the blade shape of the ultra-long blade complex curved surface integral impeller made of the aluminum alloy material is complete, deformation is small, the blade lines of the blade faces of blades are smooth, mass reduction in dynamic balancing is small, and the yield is high; and process improvement in the integral impeller part of the structure is achieved, product quality is guaranteed effectively, the design requirement is met effectively, the stability of production quality is improved, and the reliability of products is guaranteed.