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 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.