2results about How to "Good performance requirements" patented technology

This invention discloses an electromagnetic wave absorbing material based on in-situ grown carbon nanotubes from FeCoNi alloy and its preparation method. First, an iron-based metal-organic framework is synthesized via a hydrothermal reaction, followed by ultrasonication, washing, and drying to obtain iron-based metal-organic framework nanoparticles. Then, the surface of the iron-based metal-organic framework nanoparticles is modified using polyvinylpyrrolidone, and Co is adsorbed onto them. 2+ and Ni 2+ Polyvinylpyrrolidone (MOF)-modified iron-cobalt-nickel (FeCoNi)-based metal-organic framework (MOF) nanoparticles were obtained. Finally, melamine and the cobalt-nickel-adsorbed MOF-modified FeCoNi-based MOF nanoparticles were subjected to a carbothermal reduction reaction under a nitrogen atmosphere to obtain the electromagnetic wave absorbing material. This invention relies on MOF porous templates and metal nanoparticles to catalyze the growth of carbon nanotubes, improving conductivity loss. Simultaneously, the interfacial polarization between the generated FeCoNi nanoparticles and the carbon matrix optimizes impedance matching and enhances electromagnetic wave absorption performance.

The utility model discloses a kind of vertical take-off and landing platforms with high-strength buffering, including platform body, support structure and buffer damping system. Belong to the technical field of aircraft take-off and landing equipment. Platform body adopts honeycomb sandwich structure, upper and lower surface is high-strength alloy steel plate, and middle is regular hexagon honeycomb aluminum matrix composite core body;The column of support structure is hollow tubular, bottom is equipped with adjustable height pedestal, and form triangular stable structure by transverse connecting beam and oblique support beam;Platform body lower surface double-layer steel plate is equipped with staggered distribution shock absorber spring and hydraulic damper between. In addition, column pipe wall is made of fiber reinforced resin matrix composite material and built-in spiral reinforcing rib, and platform edge is equipped with carbon fiber reinforced plastic and memory alloy wire woven crash barrier. The utility model discloses vertical take-off and landing platform realizes high-strength, lightweight, excellent shock absorption and environmental adaptability, and wide application range.