Abstract
Based on the reflection, absorption and multiple reflection attenuation principle of composite shielding, composite fiberboard with multiple electromagnetic shielding functions was developed according to the structure design, which was made by filling with mineral powder and stainless steel nets, and then sprayed single face with conductive paint. The results show that: electromagnetic shielding effectiveness of the product is above 60dB and reaches the better grade in 18.85MHz-1.46GHz; the product filled with magnetite powder has better comprehensive mechanical properties than the product filled with barite powder, and its modulus of rupture, modulus of elasticity, internal bonding strength and thickness swelling rate of water absorption all reach the Chinese national standards.
Highlights
With the effects of electromagnetic radiation and electromagnetic interference for people’s health and society increasing, it was very imperative to study new electromagnetic shielding function materials, and wooden electromagnetic shielding materials was one hot point of the study
Xianquan Zhang and Yixing Liu [1] had studied the ratio of stainless steel fiber which had affection on the electromagnetic shielding effectiveness of steel/wood composite fiberboard, and the results showed that: when the steel/wood composite fiber was on the bilateral surface layer of fiberboard with the proportion of 1:3, the electromagnetic shielding effectiveness could reach above 55 dB in 0-1.5 GHz
Xiansen Liu and Feng Fu [3] made three-layer compound larch plywood by adding respectively brass fiber and stainless steel fiber to urea-formaldehyde resin as conductive unit, and the effectiveness was in the range of 6.34 dB to 28.76dB when added with brass fiber and 13.63-21.14dB when added with stainless steel fiber in 9kHz-1.5GHz
Summary
With the effects of electromagnetic radiation and electromagnetic interference for people’s health and society increasing, it was very imperative to study new electromagnetic shielding function materials, and wooden electromagnetic shielding materials was one hot point of the study. 1874-088X/12 materials by magnetron sputtering and discovered that the effectiveness could reach above 30dB in 30Hz-1.5GHz. Keyang Lu and Feng Fu [7] had researched the property of electromagnetic shielding plywood laminated with conductive membrane; and discovered that when copper fiber was 200g /m2, the effectiveness was 39.30-61.75dB and the average was 49.65dB in 9kHz-1.5GHz. Jiaqi Zhu et al [8] had researched the composite of metal mesh and wood veneer, the results showed that the effectiveness could reach above 40dB in 1MHz-1GHz. Junling wang and Hongsha Guo et al [9] have studied on wood-based panel whose surface was separately pasted with Ni-plated fabric and coarsening copper; the effectiveness of the wood-based panel whose surface was pasted with Ni-plated fabric was about 60dB and the other one was above 70dB. This study, aiming at making a new kind of electromagnetic shielding function composite fiberboard, uses inexpensive natural ore powder (barite powder, magnetite powder) and two layers 80 mesh stainless steel nets and plated with copper-silver conductive paint
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