35results about How to "Grain refinement is obvious" patented technology

The invention relates to the technical field of aluminum alloys, in particular to an aging treatment method for improving the toughness of an Al-Zn-Mg-Cu aluminum alloy, a high-toughness aluminum alloy and a preparation method thereof. The aging treatment method provided by the invention comprises the following steps that three stages of aging treatment are carried out on the Al-Zn-Mg-Cu aluminumalloy; the Al-Zn-Mg-Cu aluminum alloy is an Al-Zn-Mg-Cu aluminum alloy subjected to solution treatment; the temperature of the first-stage aging treatment is 120-130 DEG C, and the heat preservation time is 22-26 h; the temperature of the second-stage aging treatment is 200-220 DEG C, and the heat preservation time is 10-20 min; and the temperature of the third-stage aging treatment is 160-170 DEGC, and the heat preservation time is 22-26 h. The alloy obtained after the three stages of aging treatment has good strength and fracture toughness at the same time.

The invention discloses a preparation method of a high-wear-resistance high-hardness titanium alloy composite sleeve. The preparation method comprises the following steps that 1, shot blasting treatment is carried out on the outer surface of a conventional titanium alloy composite sleeve; 2, 2, pretreatment is carried out on the outer surface of the titanium alloy composite sleeve; 3, the titaniumalloy composite sleeve is fixed into a micro-arc oxidation groove set; 4, micro-arc oxidation treatment is carried out on the outer surface of the titanium alloy composite sleeve; 5, the outer surface of the titanium alloy composite sleeve obtained after micro-arc oxidation is cleaned and dried. An outer surface micro-arc oxidation coating of the titanium alloy composite sleeve adopting shot blasting is uniform and compact, the hardness of the surface layer of the sleeve is increased, and the titanium alloy composite sleeve has certain wear resistance and mechanical stability. According to the method, the conventional titanium alloy composite sleeve is subjected to shot blasting treatment and micro-arc oxidation treatment, and a protective layer high in hardness and resistant to wear andcorrosion is formed on the outer surface layer of the titanium alloy composite sleeve, so that the service life of the titanium alloy composite sleeve is prolonged, the production cost is reduced, andthe application of the technology in the field of oil and gas wells is further accelerated.

The invention provides an aluminum alloy sheet. The aluminum alloy sheet comprises, by weight, 8.0%-11.0% of Si, 0.8%-1.0% of Cu, 0-0.1% of Mg, 0-1.5% of Fe, 0-1.0% of Zn, 0-0.1% of Mn, 0-0.4% of Ni, 0-0.3% of Sn, 0.1%-0.2% of Sr, 0.1%-0.2% of Ti, 0.1%-0.2% of B, and the balance Al, and the total amount of the Sr, the Ti and the B is smaller than 0.3%. The Sr is added into the aluminum alloy sheet, so that the strength and the toughness of the aluminum alloy sheet are effectively improved; the Ti and the B are added into the aluminum alloy sheet so that good grain refinement can be generated, impact cracks are effectively avoided, the appearance of castings is improved, and the surface quality is improved; under the condition that the strength is not lowered, the impact toughness of the aluminum alloy sheet is effectively improved, and good heat conductivity is achieved.

The invention discloses an aluminum alloy ingot. The aluminum alloy ingot comprises, by weight , 9.6%-12.0% of Si, 1.5%-3.5% of Cu, less than 0.3% of Mg, less than 1.3% of Fe, less than 1.0% of Zn, less than 0.5% of Mn, less than 0.5% of Ni, less than 0.3% of Sn, 1%.-2%. of Sr, 1%.-2%. of Ti, 1%.-2%. of B and the balance Al. The Si element is added to the aluminum alloy ingot so that strength and toughness of the aluminum alloy ingot are effectively improved, and the Ti and B elements added into the aluminum alloy ingot enables a die-casting product to generate good grain refinement, casting cracks are effectively avoided, the appearance of a casting is improved, the surface quality of the ingot is improved, particularly cold shut of the ingot is reduced, and the impact toughness of the aluminum alloy ingot is effectively improved by 15%-20% on the condition that the strength of the aluminum alloy ingot is not reduced.

The invention belongs to the technical field of coating preparation and particularly relates to an AlCrSiN nano-composite coating resistant to high temperature and abrasion and a preparation method thereof. According to the AlCrSiN nano-composite coating resistant to high temperature and abrasion and the preparation method thereof, a pulsed arc ion plating method is adopted; and a Cr interface implantation layer, a CrN transition layer and an AlCrSiN surface functional layer are sequentially deposited on the surface of a base body from bottom to top. Experimental results show that the AlCrSiNnano-composite coating obtained through the preparation method is excellent in high-temperature stability and abrasion resistance and has the advantages of being small in number of surface large particles, low in internal stress, high in film base bonding strength and the like; and the AlCrSiN nano-composite coating is applicable to surface protection of products such as mechanical parts, tools and molds.

The invention provides an insulation lifting platform. The insulation lifting platform comprises a base 7, a stand rod frame 2, a lifting frame 4 and an operation table 5 coaxially arranged in sequence from bottom to top, and is characterized in that a lifting basket 1 is arranged in the lifting frame 4. The insulation lifting platform is excellent in electric insulation performance, can satisfy the requirements of 1000 kilovolt electrified operation, is light in weight, is firm, satisfy safe operation demands, and is convenient to operate, use and transport.

The invention discloses a high-strength and tough aluminum section material for rail transit. Its chemical composition includes: Zn, Mg, Cu, Mn, Cr, Ti, Zr, Bi, B, Gd, Sc, Ho, Y, V, and the balance is Al; the preparation method of aluminum profiles includes: melting and casting raw materials, homogenizing, rolling, solid solution, quenching and aging treatment; the cooling rate of quenching is 10000×C Zr +15000×C Sc +15°C / s; C Zr 、C Sc are the mass percentages of Zr and Sc respectively; the aging treatment is a four-stage aging treatment; the temperature of the first-stage aging treatment is 155-180°C, and the time is 10-22h; the temperature of the second-stage aging treatment is 200-230°C, and the time is The temperature of the third-stage aging treatment is 90-120°C and the time is 5-15h; the temperature of the fourth-stage aging treatment is 160-170°C and the time is 3-5h.

The invention provides a tantalum-containing copper alloy wire / ribbon, which comprises the following components in mass percentage: tantalum: 0.01-1.0%, silver: 0.01-1.0%, iron: 0.01-0.5%, and the balance is copper. It also provides a preparation method of tantalum-containing copper alloy wire / strip. The continuous casting machine performs high-temperature treatment on copper-tantalum master alloy, silver, copper-iron master alloy and copper, draws and casts after cooling, and then draws for many times. After processing, it is continuously heat-treated on annealing equipment to obtain tantalum-containing copper alloy wires, which are rolled into tantalum-containing copper alloy strips of required specifications by twin-roll rolling mills. The addition of tantalum in the present invention effectively improves the magnetic permeability of the copper alloy, the addition of silver improves the strength of the copper alloy, and ensures the good electrical conductivity of the copper alloy wire / band, and the iron element in the copper alloy is conducive to further strengthening the copper alloy. Magnetic permeability, the elemental combination of tantalum, silver, iron, and copper makes the copper alloy material have good magnetic permeability, electrical conductivity and high strength.

The invention discloses an aluminum alloy material for an automobile hub. The material comprises the following components in percentage by mass: 12-15% of Si, 14.4-22.5% of Mg, 1-1.5% of Cu, 0.2-1.3% of Fe, 0.3-0.9% of Zn, 0.1-0.4% of Mn, 0.3-0.6% of Nb, 0.1-0.3% of Ni, 1-1.8% of Li, 0.1-1.5% of Re, 0.1-0.3% of Cr, 0.5-1% of Sr, 0.3-0.5% of Sn, 1-2% of mixed rare earth and the balance of Al. As aluminum is used as a main substance of the alloy, the density of the material is reduced, and the purpose of lightening the automobile hub is achieved; due to adoption of the element Sr added into the aluminum alloy, the strength and the toughness of the aluminum alloy are effectively improved; due to adoption of elements Ti and B, good grain refinement can be achieved for a pressure cast product, cast crack can be effectively overcome, and meanwhile good heat radiation properties are achieved.

The invention discloses continuously self-catalyzed deposition chemical plating solution of tin and a using method thereof. Half-bright and silvery-white tin-copper alloy deposition layers are obtained on pure copper and a copper alloy substrate. In the chemical plating solution, stannous chloride serves as a main salt, thiourea serves as a main complexing agent, trisodium citrate serves as an auxiliary complexing agent, sodium hypophosphite serves as a reducing agent, disodium ethylene diamine tetraacetate serves as an antioxidant, a hydrochloric acid serves as a stabilizing agent, gelatin serves as a leveling agent and benzaldehyde serves as an auxiliary brightening agent. The using method comprises the following operating conditions that: the pH value of the plating solution is 0.8 to 2.0; the temperature is 80 to 90 DEG C; the loading capacity is 0.8 to 1.5 dm2 / L; and the mechanical stirring speed is 50 to 100 rpm. The continuously self-catalyzed deposition chemical plating solution of the tin and the using method thereof have the advantages of capability of obtaining half-bright and silvery-while tin-copper alloy clad layers with different thicknesses by controlling chemical plating time, high deposition rate, remarkable grain refinement, improvement on surface evenness of the clad layer and batch production stability, secure interface combination, strong change resistance of the clad layer after being passivated, and broad application prospect in the products of deep hole elements, blind hole elements, difficult-to-handle miniature electronic components and parts, printed circuit boards PCBs and the like.

The invention relates to an Al-Cu alloy material and the casting and heat treatment process thereof. The material is produced by the pure aluminum, the Al-Cu alloy, the Al-Mg alloy and the Al-Ti alloy being taken as raw materials and made a casting and heat treatment. The weight proportion of the compositions is: pure aluminum of 75 to 88, Al-Cu alloy of 6-12, Al-Mg alloy of 2-7, and Al-Ti alloy of 4-8. The Al-Cu alloy material of the invention has higher strength, excellent plasticity, good fluidness as well as good heat treatment, cutting process and polishing performance, and is not easy to appear sand holes, air holes and shrinkage porosity after casting.

The invention relates to an aluminum alloy ingot. The aluminum alloy ingot is prepared from, by weight percent, 7.2%-11.4% of Si, 1.2%-1.5% of Cu, 0.1%-0.3% of Mg, 0.2%-0.4% of Fe, 1.2%-1.4% of Zn, 0.2%-0.4% of Ni, 0.1%-0.3% of Sn, 1.2%-2.4% of Sr, 2.1%-2.4% of Ti, 2.1%-2.4% of B, 1.2%-1.4% of Sb, 0.3%-0.5% of As, 0.22%-0.44% of RE, 0.4%-1.4% of LaCe, 0.3%-0.5% of Pr and the balance Al and inevitable impurities, wherein the content of the impurities is not larger than 0.1%. The aluminum alloy ingot is good in comprehensive performance, resistant to corrosion and stable in performance.

The invention discloses a method for preparing aluminum-scandium alloy with high scandium content. The method comprises: weighing metal scandium and metal aluminum according to the content of scandium in the aluminum-scandium alloy to be prepared; adding them to a medium-frequency induction melting furnace, continuously pumping the vacuum, and then raising the temperature to 1200-1600° C. to melt the metal scandium and metal aluminum; completely After melting, the alloy liquid is obtained and kept warm for 20-40 minutes; filled with high-purity argon, pouring the heat-preserved alloy liquid into a water-cooled copper mold, using the mold circulating water refrigeration system to cool the circulating water to 1-15 °C first, and then The cooled circulating water is passed into the water-cooled copper mold to circulate and cool the alloy liquid, and the alloy liquid can be cooled and solidified within 3-8 seconds, and an aluminum-scandium alloy ingot with a scandium content of 5%-99% can be obtained. The present invention can realize rapid cooling within 3-8s, and can produce high-scandium-content aluminum-scandium alloys with high purity, high density, low segregation, uniform composition, and low cost, which meets the current market demand for high-scandium-content aluminum-scandium alloys .

The invention discloses an iron-based wear-resistant composite material and a preparation method thereof. The preparation method includes the following process: using a laser cladding method to prepare an iron-based wear-resistant composite coating on the surface of an iron-based alloy base material with iron-based composite powder. layer to obtain the composite body; the surface of the composite body is polished and cleaned; then laser shock is carried out to realize the surface enhancement treatment of the iron-based wear-resistant composite coating; the composite body subjected to laser shock on the surface is subjected to cyclic heat treatment to eliminate residual stress; The iron-based composite powder is micron La 2 o 3 Powder, Micron Al 2 o 3 The powder and micron FeCrNiSiB powder are uniformly mixed, cryogenically treated with liquid nitrogen circulation, and dried. In terms of mass percentage, the iron-based composite powder contains: 0.05% to 10% of micron La 2 o 3 Powder, 0.1%~45% micron Al 2 o 3 powder and 50% to 95% micron FeCrNiSiB powder. The invention improves the service life of the iron-based alloy matrix by preparing a composite coating with good performance on the surface of the iron-based alloy material, and has great significance for the repair and reconstruction of engineering machinery.