The Analysis And Research Of The Shielding Alloy Disorder Thermal Network

Plastic composite shielding materials, mostly good performance by the conductive metal material made of resin composite. The species also has a very wide range, while the surface coating shielding material is one of the categories. Through the molten metal spray, paste, foil and plastics electroplating and other methods, such plastic surface of the metal conductive layer is formed. Metal layer is mainly to the majority of electromagnetic wave reflection, absorption and internal reflection through which the electromagnetic wave to achieve the purpose of anti-electromagnetic interference.Electroplating method by Cu, Ni plating to the ABS plastic, and its structure is sponge-like foam board, the pore wall of Ni - Cu - Ni layer composition, surface density is 350 to 480. Method, which is sponge-like foam or ABS as the substrate by magnetron sputtering method, so that nickel substrate obtained the first layer of Ni film, and then use the second layer of copper plating method plating layer and the third layer Ni layer, after annealing to remove the internal stress, while burning sponge foam substrate, the alloy disorder Network window nest hole shape, direction, size is disorderly, Guar has a good absorption of electromagnetic shielding performance ; as copper layer sandwiched between Ni film and Ni chemical is stable, so also has the dust, anti-acid, anti-alkali and other functions. High-strength ABS plastic and many other advantages, combined coating and substrate can be very strong, has good electromagnetic shielding effect. And conductive fiber filled ABS resin has good electrical conductivity on the one hand, can effectively shield electromagnetic waves, while maintaining the ABS resin, light weight, easy processing, low price, corrosion performance, size stability features.Preparation of sponge-like foam nickel in copper metal alloy frame, in accordance with the background technology, can now thickness of 1.8mm +0.2 mm or 1.8mm-0.2mm of foam substrates by magnetron sputtering method or methods or conductive adhesive plating the first layer of nickel film was obtained, which have many smaller nest holes (pores) of the sheet of nickel stencil, then use the traditional process of electroplating the second layer of copper plating layer method, get the second floor of the nickel-copper metal alloys Net Framework; also the second layer of copper plating layer in a short time after the third layer of nickel plating layer by layer of nickel-copper alloy mesh skeleton. Preparation of sponge-like foam nickel copper alloy mesh framework, it can not heat to remove the stress and burn foam substrate.The disorder is characterized by full use of network cavernous formation of copper alloy nickel foam "nest hole," the "disorder" and "infinite number" of the two features, combined with electromagnetic wave propagation and reflection characteristics of a straight line path design to gain an excellent screening absorption. Said shielding process: hinder, resist external electromagnetic leakage and interference during the process, no electromagnetic wave energy conversion; said absorption process: the part of the electromagnetic energy into heat energy. Shield absorption effect, because the sponge-like foam nickel copper alloy formed "nest hole" size, number, arrangement, nest hole wall geometry of S is infinite disorder and, in particular, each wall of the small of their normal S direction is random and infinite, electromagnetic waves in the reflection will also be disorderly and unlimited number, and a real sense of "arbitrary reflection." Each time the reflection of electromagnetic wave propagation hinder one, while electromagnetic (wave) can be converted into heat the first two, namely, absorption time, this macro will be an excellent shielding and absorption.As the alloy is disordered network structure of the model for the rectangular, so when we take into account its analysis of the electromagnetic wave in the network through the alloy after the other side would be great if electromagnetic interference, and when to use the network as a disorder When shielding materials, packaging equipment within the structure of more complex, if excessive interference, then that may affect the normal operation of its internal components, only the electromagnetic shielding enough to reach as far as possible within the reach of electromagnetic interference minimum also is a problem we must consider, so analysis of the internal electromagnetic leakage can better guarantee the stability of the internal device. For the analysis of magnetic drain we need to consider the finite element formulation Pan.Network for the alloy disorder and structural characteristics of materials, modeling and simulation in the frequency range from (0-2) GHz, this disorder full advantage of network irregularities, many of reflection and refraction to achieve a good the electromagnetic wave shielding effect. And because the copper layer of nickel on both sides of the folder, so also have good anti-acids, anti-alkali and other functions.