34results about How to "Less organizational defects" patented technology

The invention discloses a preparation method of an electrified railway chromium-zirconium-copper contact line. Copper is taken as a substrate, 0.30-0.70% of Cr and 0.10-0.35% of Zr in percentage by weight are added into the substrate, and the total sum of impurities is no greater than 0.05%. The preparation method comprises the following steps: performing vacuum melting and vacuum horizontal continuous casting, thereby obtaining a long-length large cross section chromium-zirconium-copper continuous cast blank; performing full hot continuous rolling and on-line solid solution, thereby obtaining a long-length chromium-zirconium-copper line rod disc; drawing and peeling the disc, and performing cold continuous rolling, thereby reducing the diameter; further performing aging treatment to reinforce the disc; further performing cold continuous rolling by using a Y-type rolling machine, thereby pre-forming the line; and finally performing fine drawing formation once. The chromium-zirconium-copper contact line produced by using the preparation process is fine and uniform in grain, free of defect, high in strength, high in conductivity and high in softening temperature, and applicable to industrialized production.

A 3D printed powder material, the powder includes a mixture of sintered WC-Co cemented carbide spherical particles and tungsten carbide particles as a wear-resistant phase, and a Co-based alloy as a bonding phase; the weight percentage of the wear-resistant phase It is 20%-60%, the weight percentage of binder phase is 40%-80%; the weight percentage of sintered WC-Co cemented carbide spherical particles is 5%-15%, coarse grain or single crystal tungsten carbide The weight percentage of the particles is 15-45%; it can effectively avoid or delay the failure period, and improve the wear resistance and work efficiency of the material.

The invention relates to an aluminum-based composite material, in particular to a high-strength anti-fatigue in-situ nano-strengthened aluminum alloy and a die-casting method thereof. Die castings are obtained through in-situ nano-strengthening and alloy composition regulation, combined with an optimized nonlinear high-pressure die-casting process. In situ nano-ZrB 2 Reinforcement and Nano-Al 3 The scale effect, interface effect and heterogeneous nucleation effect of Er precipitates significantly improve the strength, fatigue resistance and damping performance of the alloy; at the same time, the content of Mg, Zn and Fe elements is increased, and Mn and Ni elements are introduced, While increasing the content of the strengthening phase and obtaining high strength, the harmful coarse precipitation phases such as Al-Fe are effectively refined and rounded, and the good die casting performance of the alloy is guaranteed; thus, the alloy and the die casting method of the present invention are used to produce the alloy. The components show high strength plasticity, high fatigue resistance, high damping performance and good die casting performance.

A casting method by continuous directional solidifying includes extending one end of drawing line or plate in crystallizing mouth, extending its another end is cooling liquid, preheating the crystallizer, pouring fluid material in the crystallizer, insulating for directional solidifying, and drawing said drawing line or plate to draw the solidified material in cooling liquid. Its apparatus is composed of crystallizer, drawing line or plate, cooling unit, drawing unit and check unit. Its product (wire or plate) features high quality and uniformity, and excellent performance.

The invention relates to a novel valve-regulated lead-acid battery for electric vehicles, a novel valve-regulated lead-acid battery for electric vehicles in the battery, which is characterized in that the negative grid in the lead-acid battery uses a quaternary alloy, Ca 0.06‑ 0.09%, Sn 1.0‑1.2%, Al 0.015‑0.035%, Pb complement; the positive grid uses a quaternary alloy, Ca 0.06‑0.09%, Sn 0.5‑0.7%, Al 0.015‑0.035%, Pb complement. The invention also includes the limitation on the composition and content of the lead paste of the positive and negative plates, and the preparation of the lead-acid storage battery. The invention fundamentally solves the problems of the consistency of batteries used in groups and the service life of deep cycles.

The invention relates to a magnesium-aluminum-zinc wrought magnesium alloy containing calcium and rare-earth samarium. The wrought magnesium alloy comprises the following components by mass percent: 5.3% to 6.0% of Al (aluminum), 0.7% to 1.0% of Zn (zinc), 0.4% to 0.5% of Ca (calcium), 0.2% to 1.5% of Sm (samarium), less than or equal to 0.15% of inevitable impurities and the balance of Mg (magnesium), wherein all the components taken as raw materials in proportion are fused and rapidly cooled in a salt bath; an obtained alloy spindle is annealed in a homogenization manner at 400 DEG C and air-cooled to reach a room temperature; then the hot extrusion is carried out on the alloy spindle at 360 DEG C according to the extrusion ratio being 25:1, so that the magnesium-aluminum-zinc wrought magnesium alloy containing the calcium and the rare-earth samarium is obtained. After the thermal deformation is carried out on the magnesium alloy, the tensile strength and the yield strength of the magnesium alloy are improved. Thus, the foundation for actual production applications of the wrought magnesium alloy is laid.

The invention discloses a manufacturing method and application of nano-intermetallic compound dispersion strengthened copper alloy. The composition and mass percentage of the copper alloy are as follows: Sn: 4-8%, Ni: 1.5-4%, Ag: 0.05-0.6%, rare earth elements : 0.07~0.2%, Zn: 1.48~2.43%, X: 3.52~7.57%; wherein, X is any one or more of Al, Mn, Sc, B; rare earth elements include at least Ce, La and Y; The mass percentage of rare earth elements and Sn is 1:(40~55); the mass percentage of Ce, La and Y is (0.2~0.5):1:(0.1~0.35), and the balance is Cu. The copper alloy can be used in friction discs of high-speed train motor rotors. The copper alloy of the invention has good wear resistance and electrical conductivity.