31results about How to "Raise the initial melting temperature" patented technology

The invention discloses a rhenium-free nickel-based single crystal superalloy and a preparation method thereof. The composition of the rhenium-free nickel-based single crystal superalloy of the present invention is represented by mass percentage as 7.25-7.75% of Cr, 4.8-5.2% of Co, 1.8-2.2% of Mo, 7.8-8.2% of W, and 6.3-6.7% of Ta , 6.0-6.2% Al, 0.12-0.18% Hf, 0.04-0.06% C, 0.003-0.005% B, 0.010-0.030% Y, and the rest is Ni. The preparation of the above-mentioned rhenium-free nickel-based single crystal superalloy comprises the following steps: using a vacuum induction furnace to melt the master alloy, and preparing a cast rod of the master alloy by gravity casting; using the seed crystal method to pass the Bridgeman directional solidification technology at a temperature gradient of 150-250K / cm , the single crystal test bar was prepared at a pulling rate of 5-100 μm / s; the single crystal superalloy was solid solution treated in the range of 1295-1305 °C for 2-4 hours, followed by air cooling, and then in the range of 1090-1310 °C 2-4 hours of high-temperature aging treatment within 2-4 hours, followed by air cooling; then 16-24 hours of low-temperature aging treatment in the range of 850-890 ° C, followed by air cooling.

The invention discloses a high-performance cobalt-based high-temperature alloy brush wire material. The high-performance cobalt-based high-temperature alloy brush wire material is characterized in that the brush wire material comprises, by mass percent, 0.02%-0.1% of C, 1%-1.5% of Al, 0.5%-2% of Ti, 0.003%-0.01% of B, 10%-14% of W, 9%-11% of Cr, 17%-25% of Ni and the balance Co and inevitable impurities. The material has high-temperature-resistance wear resistance, high-temperature-resistance corrosion resistance and oxidization resistance, in addition, high strength is achieved, in other words, a proper alloy component ratio, a corresponding processing and preparing technology and a corresponding heat treatment technology are selected, and due to the fact that alloy strengthening elements are properly added and the processing and preparing technology is improved, the alloy performance is greatly strengthened, the tissue evenness is improved, grains are refined, defects are lowered, impurities are reduced, and the yield of alloys is increased. Meanwhile, the comprehensive performance of the alloys should be improved as much as possible on the premise that plasticity of the alloys is not changed.

The invention discloses an abrasion-proof and corrosion-resistant nickel-based alloy wire and a preparation method thereof. The alloy wire comprises the following components: 17-21% of C, 20-25% of Co, 1.8-2.2% of W, 6.4-9.5% of Mo, 1.4-1.8% of Al, 3.2-4.5% of Ti, 0.1-0.5% of Nb, 0.1-0.5% of Hf, 1.2-1.8% of Ta, 0.03-0.06% of Re, 0.01-0.05% of Ce, 0.02-0.1% of C, 0.005-0.015% of B, 0.02-0.07% of Zr, 0.005-0.008% of Mg, and the balance Ni. The preparation technology of the alloy comprises the steps of vacuum smelting, remelting, forging, hot rolling, drawing, solid solution treatment and aging treatment, namely, raw materials are prepared and smelted based on mass percent and then smelted; the smelted materials are forged and rolled into obtain alloyed wire rods; the alloyed wire rods are drawn at a plurality of times to obtain phi 0.05-0.4mm alloy wires; finally the alloy wires are subjected to solid solution treatment and aging treatment. The abrasion-proof and corrosion-resistant nickel-based alloy wire can be used as a brush wire material for brush sealing of an aircraft engine, a gas turbine, etc., thus the brush sealing effect can be effectively improved, and the service life can be prolonged.

The invention is a high-strength casting magnesium alloy, which is a Mg-Bi-Al-Zn-Sr alloy, and the weight percentages of its components are: Bi3-8.0wt%; Al 0.5-4.0wt%; Zn 0.1-1.0wt%; Sr 0.05-0.15wt%, the rest is Mg. In the present invention, Bi element is used as the main alloy element, and a large amount of Mg3Bi2 phase is formed through a simple alloying method, supplemented by a small amount of aluminum element and zinc element to improve the strength of the alloy, thereby developing a high-strength cast magnesium alloy in this alloy series , the tensile strength of the alloy is 276-296MPa, the yield strength is 155-170MPa, and the elongation is 5.3-7.3%, achieving mechanical properties comparable to those of rare earth magnesium alloys.

The invention relates to a high-speed extrudable deformed magnesium alloy and a preparation method thereof. The mass percentages of the alloy components are: 2-10wt% Bi, 0.5-5wt% Al, 0.1-2wt% Zn, 0.1-1.0wt% %Mn, the rest is magnesium. The magnesium alloy of the present invention uses Bi element as the main alloy element, forms a large amount of Mg3Bi2 phase through simple alloying means, supplements a small amount of aluminum element and zinc element to improve the plasticity of the alloy, and cooperates with manganese element to improve the corrosion resistance. , so that a high-strength magnesium alloy that can be extruded at a high speed has been developed in this alloy series, which can be used for high-speed extrusion with an extrusion speed of not less than 20m / min.