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

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 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 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.