34results about How to "Good microwave absorption characteristics" patented technology

The invention discloses a LaCeNi magnetic microwave absorbing material and a preparation method thereof. The stoichiometric proportions of a molecular formula of the magnetic wave absorbing material are as follows: 10.0%-16.7% of La, 0-6.0% Ce and 83.3% Ni. The LaCeNi magnetic microwave absorbing material is prepared by the following main steps: smelting La, Ce and Ni metals, of which the purities are greater than or equal to 99.90% as raw materials under argon protection; carrying out heat treatment on a cast ingot in vacuum at 800-1050 DEG C; quenching with ice water; and carrying out ball-milling to form powder after mechanically crushing. The LaCeNi magnetic microwave absorbing material has relatively excellent microwave absorbing property in a 2-18GHz of microwave band; when the thickness of a compound is 1.5mm, the minimal absorption peak can reach about 40.1dB; the LaCeNi alloy disclosed by the invention has the advantages of good wave absorbing property, wide absorbing frequency band, simple preparation process, good corrosion resistance and the like in the 2-18GHz of microwave band; and the LaCeNi magnetic microwave absorbing material disclosed by the invention is suitable for preparation of microwave absorbing products of requiring wide absorbing frequency band, good wave absorbing property and good corrosion resistance in the magnetic wave absorbing material.

The invention discloses an ErFeV magnetic wave-absorbing material. The alloy comprises the following atoms in percentage: 10.5 percent of Er, 83.5-89.5 percent of Fe and 0-6 percent of V. The ErFeV magnetic wave-absorbing material is prepared by the method comprising the following main steps: taking metals Er, Fe and V with the purity of more than or equal to 99.90 percent as raw materials, smelting under argon shield, performing homogenizing thermal treatment on a cast ingot at the temperature of 600-800 DEG C in vacuum, quenching by using ice water, mechanically crushing, and ball-milling into powder. The ErFeV alloy disclosed by the invention has good wave-absorbing performance and wide absorption band in the microwave band of 2-18GHz and has the advantages of simple preparation process, abundant raw materials, low price and the like. According to the magnetic wave-absorbing material, the ErFeV magnetic wave-absorbing material disclosed by the invention is suitable for preparing microwave absorption products with wide absorption band, good wave-absorbing performance and low cost.

The invention relates to a method for improving strength of plastic quick-formed parts and equipment for producing special wires. The method is characterized by comprising the steps of: preparation of plastic wires bonded with graphene microchips on the surfaces, production of the quick-formed parts, microwave treatment and insulation and cooling. The equipment comprises a frame, a plastic extruder, a cooling tank, a ultrasonic disperser, a traction wheel set and a winder. The method has the following advantages: the produced plastic quick-formed parts are high in strength, excellent in layered strength and invariable in sizes and shapes of traditional workpieces; and the method is convenient to operate, low in cost, excellent in effect and suitable for various thermoplastic quick-formed parts.

The invention provides a HoFeB/Fe3O4 wave-absorbing composite material and a preparation method thereof. The HoFeB/Fe3O4 wave-absorbing composite material is suitable for the field of microwave absorbing materials. The preparation method includes the following steps that Ho, Fe and B with the purity equal to or more than 99.95% serve as raw materials respectively and are repeatedly molten into ingots with uniform compositions in an argon atmosphere, vacuumizing is conducted, and the ingots are sealed in quartz glass for homogeneous annealing at 800 DEG C, then quenched with an ice-water mixture, mechanically crushed into powder and ball-milled into powder by using high energy; the powder obtained after high-energy ball milling and ferroferric oxide are placed in an agate mortar for grinding and mixing according to the relative molecular mass ratio, and the HoFeB/Fe3O4 composite material is obtained. The wave-absorbing composite material has a very good microwave absorbing effect in themicrowave frequency band of 2-18 GHz and a wide wave-absorbing bandwidth, has the advantages of a simple preparation process, high oxidation resistance and the like, and can be suitable for preparation of microwave absorption products which require wide wave-absorbing bandwidth, good wave-absorbing performance and high oxidation resistance.

The invention discloses a single-phase multiferroic microwave absorbing material NdBi6Ti3 (Fe1-xCox) 3O21(x=0.25-0.3) and a preparation method thereof. Because of the symbiotic structure of layered perovskite and the chemical modification of neodymium, the microwave absorbing material exhibits excellent multiferrous properties due to the interaction between ferrite octahedron and cobalt-oxygen octahedron. Based on these physical characteristics, the material exhibits good microwave absorbing property in the microwave range of 2-18GHz, has high absorption intensity and wide absorption band, andis far superior to the microwave absorption performance of the partial carbon/ferrite composite material; and the preparation method has the advantages of simple operation, short experiment period, favorable for large-scale production and wide application prospect.

The invention discloses a neodymium-iron-boron permanent magnet wave-absorbing material and a preparing method thereof. The preparing method includes the steps that ingredients are put into a medium-frequency induction furnace to be melted; rapid-hardening pouring is carried out on a melted solution to obtain rapidly-hardened melt-spun sheets; the rapidly-hardened melt-spun sheets are taken out after being cooled; the rapidly-hardened melt-spun sheets are thermally treated within the temperature ranging from room temperature to 1000 DEG C and crushed, crushed powder is screened, magnetic property parameters such as saturation magnetization intensity, residual magnetism and coercive force are detected, and electromagnetic parameters and the reflectivity R of the powder are tested; a wave absorbing material is obtained, and the wave absorbing material has good microwave absorption characteristic within the microwave band of 2-18 GHz and has multiple absorption peaks. Permanent magnet performance and wave absorbing performance of the neodymium-iron-boron material are considered, and a new direction is developed for neodymium-iron-boron development. The method is simple in preparation process, facilitates industrialization and is convenient to put into production, and the industrial production technology is mature.

The invention relates to the technical field of plastic flooring, particularly to surface scratch self-repairing plastic flooring, wherein the preparation method comprises four steps of graphene composite powder preparation, raw material blending, extrusion molding and composite molding. Compared with the existing common polyvinyl chloride plastic flooring, the plastic flooring prepared by the invention has the following advantages that thermoplastic polyurethane and an epoxy resin are mainly used as matrixes and are subjected to high-temperature kneading to replace a polyvinyl chloride resinso as to make the plastic flooring have the flame retardance and a certain self-repairing capacity of the thermoplastic polyurethane, the thermoplastic polyurethane is modified with castor oil and trimethylolpropane, the prepared graphene loaded nanometer silver-lanthanum nitrate composite powder as a filler is added into the plastic flooring, and the surface scratch self-repairing capacity of theplastic flooring is greatly improved from three aspects by utilizing a large amount of extremely-high activity epoxy groups, hydroxyl groups, ether bonds, amine bonds, ester bonds and other polar groups carried by the epoxy resin.

The invention discloses a magnetic hollow micro-nano material, a preparation method and application thereof, and belongs to the technical field of nano materials. According to the magnetic hollow micro-nano material and the preparation method and application thereof, the magnetic hollow micro nano material prepared by a one-step liquid-phase reduction-oxidation method has novel structure and formation mechanism, the contents of Cu and Ni and the composition, feature, and structure of the magnetic hollow micro-nano material can be regulated by changing the reaction temperature, time, stirring speed, gas flow size, and reactant concentration, wherein the diameter of a micro-nano tube is 0.1 to 2 [mu]m, the length is 2 to 12 [mu]m, and the wall thickness is 10 to 140 nm; the diameter of a micro-nano sphere is 0.2 to 5 [mu]m, and the wall thickness is 10 to 180 nm. Because the magnetic hollow micro-nano material is good in dispersibility, good in homogeneity and has good microwave absorption characteristics, the magnetic hollow micro-nano material is widely used in the fields such as microwave absorbing and shield, electrocatalysis, lithium ion batteries and surface enhanced Raman spectroscopy. In addition, the disclosed preparation method is easy to operate, the environment-friendly effect is realized, industrial application potential is good, and the magnetic hollow micro-nano material and the preparation method are suitable for market promotion and application.

The invention belongs to the field of microwave absorption, and discloses a chiral planar spiral PPy/Fe3O4 composite broadband microwave absorbent as well as a preparation method and application thereof. The planar spiral polypyrrole with unique morphology is prepared by taking a surfactant as a soft template and adopting a chemical oxidative polymerization reaction method, and the diameter of the planar spiral polypyrrole is 20-40 microns. By taking the material as a precursor, the compound of chiral polypyrrole and Fe3O4 is prepared from the precursor, ferric salt and other raw materials through a dissolution heat method; not only is the morphology novel and unique, but also the content and size of Fe3O4 growing on the surface of polypyrrole can be regulated and controlled by changing the concentration of iron ions in the system and the volume of the added deionized water; and the material has excellent microwave absorption characteristics. The controllable preparation process disclosed by the invention is simple, the product morphology is novel, the characteristics that the reaction conditions are harsh, the morphology of the reaction product is difficult to regulate and control, the experimental repeatability is poor and the like in the previous preparation process are overcome, and the industrial application potential is good.

The invention discloses a magnetic hollow microsphere and a preparation method and application thereof, and belongs to the technical field of nano materials. The magnetic hollow microsphere prepared by a one-step hydrothermal method is novel in structure and formation mechanism, and the content of Cu and Co in the product and the composition, morphology and structure of the magnetic hollow microsphere can be regulated and controlled by changing the reaction temperature, time, surfactant ratio, mass ratio of copper salt to cobalt salt and reactant concentration; and the diameter of the preparedmagnetic hollow microsphere is 2.2 microns-10.2 microns, and the magnetic hollow microsphere is widely applied to the fields of microwave absorption and shielding, electro-catalysis, lithium ion batteries, surface enhanced Raman spectroscopy and the like due to good dispersity and uniformity and good microwave absorption characteristics. The preparation method is simple to operate, green and environment-friendly, has good industrial application potential, and is suitable for market popularization and application.