55results about How to "Excellent high strength" patented technology

The invention relates to full-surface super-hydrophobic anti-freezing wood and a manufacturing method thereof. The preparation method comprises the following steps: partially removing lignin and hemicellulose to form spongy wood, injecting hydrophobic nanoparticles and perfluorosilane into the outer surface and internal pores of the spongy wood through an absorption-extrusion process, and finally,carrying out hot-pressing densification treatment to obtain the super-hydrophobic anti-freezing high-strength wood. The super-hydrophobic anti-freezing high-strength wood disclosed by the invention is densified full-surface hydrophobic wood; the densification means that the wooden pipeline and the porous wooden cell wall partially collapse, so that the thickness of the wood is reduced to 30-40% of the initial thickness, and the density is increased by 2.5-3 times; wherein the full-surface hydrophobicity refers to the synergistic hydrophobicity of the outer surface of the wood and the inner surface of the pore passage of the wood. According to the anti-freezing high-strength wood, the bending strength is improved by 2-4 times compared with logs made of the same material; after 10 times offreezing and thawing cycles and 50 times of freezing and thawing cycles respectively, the bending strength is kept at 80% or above and 50% or above respectively; and the dimensional stability is stillmaintained even after 50 times of freezing and thawing cycles.

The invention provides 4Cr3MoWVNi (B3R) hot work die steel with high strength and toughness and resistance to tempering, and a preparation process thereof. Raw materials for preparing the B3R hot work die steel comprise, by weight, C 0.35 to 0.42%, Si 0.15 to 0.35%, Mn 0.3 to 0.5%, Cr 2.50 to 3.50%, Mo 1.00 to 1.50%, W 0.50 to 0.80%, V 0.50 to 0.80%, Ni 1.45 to 1.85%, S 0.003 to 0.010% and P 0.008 to 0.018%, with the balance being Fe. The preparation process comprises the following steps: smelting at intermediate frequency--remelting (refining) of electroslag-diffusion hydrogen of electroslagingots, annealing treatment of electroslag ingots--forging--annealing of forging stocks--rough machining--vacuum heat treatment, and secondary tempering so as to obtain the novel product of die steel. The hot work die steel prepared in the invention has high Rockwell hardness, excellent impact toughness and tempering (thermal fatigue) resistance, and the advantages of optimized collocation of components, pure steel quality, a uniform structure, high strength, strong toughness, good tempering resistance, etc.

The invention discloses a high-strength and high-modulus dual-phase magnesium-lithium alloy and a preparation method, and belongs to the technical field of metal material magnesium alloys. The mass percentage of the high-strength and high-modulus dual-phase magnesium-lithium alloy is: Gd: 0.05-4wt.%, Al: 0.5-5wt.%, Y: 0.05-8wt.%, Li: 5-10wt.%. %, Zn: 0-5wt.%, Mn: 0.05-4wt.% The balance is Mg and inevitable impurities; wherein: the content of Zn element cannot be selected as 0. The preparation method includes a raw material preparation stage, a preheating raw material stage, a heat treatment furnace atmosphere adjustment, a vacuum smelting stage, a vacuum tube furnace atmosphere adjustment and a heat treatment stage. The invention adopts the combination of microalloying and heat treatment, which can synergistically improve the strength, elongation and elastic modulus of the dual-phase magnesium-lithium alloy while controlling the low density of the dual-phase magnesium-lithium alloy.

The invention discloses a low-density, high-strength and high-modulus magnesium-lithium alloy and a preparation method, which belong to the technical field of metal material magnesium alloys. The chemical composition of the low-density, high-strength, and high-modulus magnesium-lithium alloy in percentage by mass is: Gd: 0.5-5wt.%, Al: 0.5-6wt.%, Y: 0.5-10wt.%, Li: 8- 16wt.%, Zr: 0-1wt.%, the balance is Mg and inevitable impurities; wherein: the content of Zr element cannot be 0. The preparation method includes alloy batching, baking material, vacuum melting casting and heat treatment. The invention solves the modulus improvement that cannot be achieved by traditional Mg-Al-Zn, Mg-Gd-Y-Zr, Mg-Li-Al magnesium alloys, adopts automatic vacuum melting to precisely control the composition, has no environmental pollution, and avoids oxidative burning Damage and other problems, the preparation process is safe and reliable, and the component process performance is repeatable.

The invention discloses a method for preparing skutterudite preheated cement, which belongs to the technical field of cement preparation. A method for preparing skutterudite preheated cement utilizes double degaussing components in a powerful degaussing cylinder to demagnetize cement at high temperature and demagnetize cement, namely The high-temperature heat storage heat conduction tube and the serpentine conductive column perform high-temperature autoclaving and "ionization" on the falling cement raw materials respectively, and demagnetize the magnetic substances in the cement raw materials, and the high-temperature degaussing and power-on degaussing are carried out at the same time to achieve double enhanced demagnetization. Purpose: When the degaussed cement raw material falls to the lower end of the powerful degaussing cylinder, use the miniature magnetic detector installed at the side end of the leaking material connection pipe to detect the content of magnetic substances inside, so as to ensure that the content of magnetic substances in the cement raw material is reduced to the minimum. Prepare qualified cement raw materials into cement, basically eliminate the influence of magnetic substances on cement quality, significantly improve the stability of cement buildings, and improve the safety factor of high-rise buildings.

The invention provides an extrusion casted aluminum-zinc-magnesium-copper alloy material with high toughness. The alloy material is a high-toughness extrusion casted Al-Zn alloy material obtained by using an extrusion casting technology at an extrusion specific pressure of 25-75 Mpa and using solution treatment and an artificial aging process; the alloy material comprises the main components in percentage by mass: 6.50-7.50 % of zinc, 2.00-3.00 % of magnesium, 1.80-2.20 % of copper, 0.22-0.60 % of trace alloy enhancing elements and the balance of aluminum and inevitable impurities. The alloy material provided by the invention has the advantages of reasonable component design, excellent comprehensive mechanical property, good cast forming performance and lower cost, can be used for manufacturing parts with lightweight and weight reduction requirements, such as airplane wings, knuckles, connecting bars and other structural pieces, and has broad application prospect in the fields like automobile, transportation, aviation, aerospace and the like.