5 results about "Sr element" patented technology

The application discloses a preparation method of a high-strength cast magnesium alloy, the alloy containing two non-rare-earth strengthening alloy elements of Sr and Ti, wherein the Ti element is preferentially combined with Al to form AlTi or Al3Ti intermetallic compounds and is gathered along the grain boundary, hindering the growth of alpha-Mg grains, the remaining Al element is combined with Mg to form a beta phase, the grain size is reduced, the morphology of the beta phase is improved, and thus the mechanical properties are improved; the Sr element can strengthen the beta phase on one hand, and can consume the Al element at the solidification front by forming a new Al4Sr phase, so that the volume fraction of the beta phase is reduced; in addition, the Sr element can form an adsorption film of strontium on the grain growth interface as a surface active element, so that the grain growth speed is reduced, the alloy has more time to generate more crystal nuclei when solidifying, and the grains are refined; under the synergistic effect of the two elements, the strength of the magnesium alloy is significantly improved.

The application provides a kind of corrosion-resistant magnesium alloy for marine atmospheric environment and a preparation method thereof, and belongs to the field of magnesium alloy material preparation.The chemical composition of the magnesium alloy is as follows in terms of mass percentage: 6.0-6.5% of Al, 1.3-1.5% of Y, 0.3-0.5% of Zn, 0.05-0.1% of Mn, 0.1-0.12% of Sr, and the balance of magnesium and inevitable impurities.The application alloys the magnesium-aluminum alloy by the combined addition of Y, Zn, Mn and Sr elements, suppresses the micro-galvanic corrosion of the magnesium alloy, improves the protection ability of the surface film, and increases the corrosion resistance of the magnesium-aluminum alloy in the marine atmospheric environment.The preparation of the above magnesium alloy adopts semi-solid forming, the process is simple, suitable for industrial production, and the prepared product has a compact structure, reduced defects and excellent service performance.

The present application provides a highly-corrosion-resistant die-casting aluminum alloy and a preparation method therefor, and a housing-type die-cast component. The highly-corrosion-resistant die-casting aluminum alloy comprises the following components in percentage by mass: 8-9 wt% of Si, 0.2-1 wt% of Mg, 0.1-1 wt% of Fe, 0.005-0.05 wt% of Sr, 0.2-1 wt% of Mn, 0.05-0.2 wt% of Ti, 0.05-0.15 wt% of Cr, 0-0.05 wt% of Cu, 0-0.05 wt% of Zn, and the balance of Al and inevitable impurities, wherein the sum of the percentages by mass of the inevitable impurities does not exceed 0.5 wt%. By regulating the content of silicon in the die-casting aluminum alloy, the formability of the aluminum alloy is ensured; by regulating the contents of Cu, Zn, Cr, and Sr elements within the ranges of the present application and appropriately controlling the contents of Si, Mg, Fe, Sr, Mn, Ti, Cr, Cu, Zn, and Al elements, the corrosion resistance of the die-casting aluminum alloy is improved.

The invention discloses corrosion-resistant antibacterial high-strength low-alloy steel, which comprises the following elements in percentage by weight: 0.06 to 0.3 percent of carbon (C), 0.18 to 0.55 percent of silicon (Si), 0.5 to 1.7 percent of manganese (Mn), 0.001 to 0.4 percent of phosphorus (P), 0.002 to 0.06 percent of sulfur (S), 0.01 to 0.2 percent of titanium (Ti), 0.02 to 0.1 percent of vanadium (V), 0.02 to 0.1 percent of niobium (Nb), 0.04 to 0.5 percent of chromium (Cr), 0.02 to 0.3 percent of aluminum (Al), 0.01 to 0.4 percent of nickel (Ni), 0.02 to 0.2 percent of molybdenum (Mo), 0.035 percent or less of nitrogen (N), and 0.03 to 0.6 percent of copper (Cu), antimony (Sb) and strontium (Sr) in total. The low-alloy steel has the beneficial effects that through innovative design of steel components, the tensile strength of the obtained steel reaches 600 MPa compared with existing low-alloy steel; the alloy element type selectivity range is wide, and the universality is improved; and while the excellent mechanical property of the material is guaranteed, the Cu-Nb-V-Sr elements are added, so that the corrosion resistance and the antibacterial property are further improved, and the service life of the steel is prolonged.

This invention provides a Gd2(Ba 4‑r Sr r CuZrO y Nanoparticles and a method for improving the properties of single-domain gadolinium barium copper oxide superconducting bulk materials using the same, wherein the nanoparticles, based on 100 moles, have the following molar ratios: 1 mole of Gd₂O₃, 0-4 moles of BaCO₃, 0-4 moles of SrCO₃, 1 mole of CuO, and 1 mole of ZrO₂; the chemical formula of the nanoparticles is Gd₂(Ba 4‑r Sr r CuZrO y Where r takes values ​​in the range 0 ≤ r ≤ 4, and y is in Gd2(Ba 4‑r Sr r CuZrO y The oxygen content in the powder; this invention replaces RE2Ba4CuMO with Sr element. y A method for extracting Ba from phases (M = U, Mo, Zr, Bi, Nb, W, ...) has led to the development of a chemically stable Gd2(Ba) phase. 4‑r Sr r CuZrO y (r=0, 1, 2, 3, 4) nanoparticles and their complete preparation method, using Gd2(Ba 4‑r Sr r CuZrO y Nanoparticle doping improves the flux pinning ability and superconducting performance of GdBCO superconducting bulk materials.