导电屏蔽塑料技术研究进展

论述了电磁波干扰(EMI)屏蔽塑料的应用,讨论评价了EMI屏蔽的原理和EMI屏蔽塑料的制备方法,强调了填充型屏蔽塑料的特点以及制备高导电性屏蔽塑料的技术。     

屏蔽电磁波干扰塑料及其开发动向

本文在分析电磁波干扰及其屏蔽作用原理的基础上，重点讨论了表层导电型屏蔽塑料和填充复合型屏蔽塑料的种类、特性、应用以及最新发展动向，为我国屏蔽电磁波干扰塑料的研究和开发提供参考     

电磁屏蔽塑料的研究进展

介绍了电磁屏蔽的原理,综述了电磁屏蔽塑料的种类及研究应用现状,重点介绍了填充型复合塑料的性能及加工工艺,并对电磁屏蔽塑料的研究方向和发展趋势进行了展望.     

基于转移阻抗理论的导电塑料衬垫屏蔽效能研究

基于转移阻抗理论的导电塑料衬垫屏蔽效能计算方法,阐述了导电塑料衬垫转移阻抗的定义,依据导电塑料衬垫转移阻抗理论,提出了适用于导电塑料衬垫转移阻抗的等效电路计算模型,给出了导电塑料衬垫转移阻抗与其屏蔽效能的关系,即转移阻抗越小,其屏蔽效能越好这一结论。通过仿真和测试对比,验证了等效电路模型的正确性和结论的正确性,并给出了几种不同材料的导电塑料衬垫的屏蔽效能。     

塑料用涂料

气体屏蔽涂料及底材屏蔽性的改进,热塑性塑料基材的模塑涂布用涂料组合物及其用途,塑料真空镀膜底漆。     

电磁屏蔽材料的应用研究进展

简要阐述了电磁屏蔽材料的重要性以及电磁屏蔽机理,综述了近年来重要的电磁屏蔽材料,特别是电磁屏蔽涂料、电磁屏蔽织物和电磁屏蔽塑料的应用及研究进展。     

金属化碳纤维对PC/ABS电磁屏蔽塑料性能的影响

使用自行研发的碳纤维连续电镀镍生产设备生产镀镍碳纤维(NCF),并用不同用量NCF填充聚碳酸酯/丙烯腈-丁二烯-苯乙烯塑料(PC/ABS)合金基材,采用包覆工艺制备PC/ABS电磁屏蔽塑料。研究了NCF用量对电磁屏蔽塑料力学性能、热性能、电性能和电磁屏蔽效能的影响。结果表明,NCF能够在PC/ABS中均匀分散,且两者很好地结合在一起,形成完善的导电网络结构;NCF可以提高电磁屏蔽塑料的力学性能、热性能、导电性能;在NCF质量分数为18%时,电磁屏蔽塑料的综合性能最优,拉伸强度为108.18 MPa,拉伸弹性模量为15 GPa,缺口冲击强度为6.82 kJ/m~2,热变形温度为120℃,体积电阻率为7.10×10~(–3) Ω·cm,屏蔽效能可达到52～72 dB。     

导电电磁屏蔽塑料研究新进展

介绍了电磁屏蔽的基本理论,重点综述了3类主要的导电塑料即:表层导电型复合塑料、填充型复合塑料和本征导电高分子材料的研究应用现状,介绍了各类导电高分子电磁屏蔽材料的特点,并对其发展趋势做了展望。     

护套包覆有塑料导电层的电力电缆

此新型电力电缆从电缆中心向外依次是导体。导体屏蔽层、绝缘层、绝缘屏蔽层、半导电阻水膨胀层、金属护套及防腐层、塑料护套、在护套外包覆有一层掺有碳黑的塑料导电层,在塑料导电层与护套之间形成     

导电纤维在屏蔽塑料中应用的研究进展

导电屏蔽塑料是防止静电危害、电磁波污染的一种有广泛前景的功能高分子材料。本文综述了碳纤维、碳纳米管、不锈钢纤维、钢纤维和各种镀金属纤维填充导电屏蔽塑料的国内外研究进展。     

聚酰亚胺/硝酸铅辐射防护材料的制备和性能研究

以自制的聚酰亚胺(PI)为基体、硝酸铅为添加剂制备了PI/硝酸铅辐射防护材料,重点利用高纯锗γ谱仪对该材料的辐射屏蔽性能进行测试分析,研究了硝酸铅含量对材料屏蔽性能的影响,并对热性能和耐辐射性能进行了测试。结果表明,该材料具有较好的耐辐射性能和屏蔽性能,可广泛地应用于多种领域。     

Annealed Ti3C2Tx: A green and tunable electromagnetic interference shielding material

Electromagnetic interference (EMI) shielding materials are receiving more and more attentions and becoming a hot research topic because of their wide range of applications in life, defense and other fields. The development of green EMI shielding materials with tunable shielding effectiveness (SE) is a high pursuit and a great challenge for researchers. Here, we restricted the growth of TiO₂ on the Ti₃C₂T_x surface by adjusting the annealing temperature. This regulated the dipole and interface polarization and the construction of the conductive network, and improved the impedance matching. The Ti₃C₂T_x/TiO₂ heterostructured material was rationally designed and achieved an efficient EMI SE of 35.1 dB at 18 GHz when the annealing temperature was 600 °C. This work develops new avenues for the future design of efficient, controllable green EMI shielding materials. Simultaneously, this heterostructured material has great potential as a versatile green shielding material for civil, commercial and military aerospace applications.     

防电磁波辐射纤维的发展现状及工艺设计探讨

对防电磁波辐射纤维的发展现状、电磁波屏蔽机理、电磁波吸收剂以及特种纤维的工艺设计进行了详细的探讨。     

电磁屏蔽材料用银包玻璃微珠核-壳粒子的制备及其性能

采用自组装化学镀银技术制备了银包玻璃微珠核-壳粒子,并且运用X射线衍射仪、扫描电镜和电子能谱仪等对该核-壳粒子的物相和形貌等进行了表征.分析了该核-壳粒子的介电性能与结构的关系,并以此为屏蔽填料,研究了电磁屏蔽涂料的相关性能.结果表明,银粒子在玻璃微珠的表面包覆均匀且致密,该粒子的介电常数较包覆前大幅度提高.该电磁屏蔽涂料的导电性能随着填料的体积分数(下同)的增加而增加,达到25%时,其表面电阻率为0.050 7Ω/cm2.同时,在电磁波的频率范围为30～1 500MHz时,屏蔽效能达40～65 dB,并且该材料具有较好力学性能和耐环境性能.     

Microstructure and properties of WB/Al nuclear shielding composites prepared by spark plasma sintering

In this paper, a novel nuclear shielding material capable of shielding neutrons and gamma rays, WB-reinforced Al (WB/Al) composites, was prepared by spark plasma sintering (SPS) process. The microstructure of the composites was characterized, and the effects of WB content, heat treatment and matrix type on the properties of the composites were discussed. The results demonstrate that the WB particles are uniformly dispersed in the aluminum matrix and formed a good binding interface with the matrix. WAl₁₂ as an interfacial reaction product is identified, and segregation of Si and Mg elements at the reinforcement/matrix interface occurs. The mechanical properties of the WB/Al composites are sensitive to the WB content. The hardness, elastic modulus and bending strength of the composites increase monotonously as the WB volume fraction increasing, up to 234%, 107% and 91.6% higher respectively than those of the monolithic 6061Al. However, the tensile strength reaches a peak point when the volume fraction is 20%. The effects of T6 treatment and matrix type are not pronounced, especially for the composites with high WB content. The thermal neutron and gamma ray shielding properties of the composites both increase with the increase of material thickness and WB content. The WB/Al composites developed in this work show good application prospects in the field of nuclear radiation protection, due to their good mechanical properties and well neutron and gamma-ray shielding performance.     

化学镀在电磁屏蔽中的应用

化学镀技术作为一种材料表面金属化的手段,已经广泛应用于制备各种电磁屏蔽材料。简要分析了化学镀层电磁屏蔽的基本原理,并重点讨论了多种非金属基材化学镀层用于电磁屏蔽材料方面的研究现状及应用前景。     

高密度聚乙烯/铅硼复合材料屏蔽性能和力学性能研究

研究了高密度聚乙烯/铅硼复合材料的屏蔽性能和力学性能,通过屏蔽仿真比较了密度及碳化硼（B4C）含量对屏蔽性能的影响,通过试验比较了B4C含量对屏蔽性能、弯曲强度及冲击强度的影响。仿真结果表明,随聚乙烯/铅硼复合材料密度升高,快中子屏蔽性能下降,热中子屏蔽性能和γ屏蔽性能提高;保持聚乙烯/铅硼复合材料密度不变,随B4C含量的提高,中子屏蔽性能提高而γ屏蔽性能下降;实验数据表明,随B4C含量的升高,高密度聚乙烯/铅硼材料的快中子屏蔽性能、热中子屏蔽性能升高,γ屏蔽系数下降,冲击强度和弯曲强度下降明显,屏蔽性能测试结果和仿真结果规律性相符;综合仿真结果和实验数据表明,含B4C 2 %左右的高密度聚乙烯/铅硼复合材料同时具有较好的屏蔽性能和力学性能。     

MXene/PDMS composite foam with regulatable cell structures for improved EMI shielding performance

The construction of conductive network and the design of material structure are the key points of polymer-based shielding materials. Herein, we reported a MXene/PDMS composite foam material with adjustable cell structure and high efficiency electromagnetic interference (EMI) shielding. Few-layered MXene is used as a conductive filler to construct three-dimensional conductive networks by in situ chemical etching. Meanwhile, a series of polystyrene microspheres with different sizes were prepared by applying suspension polymerization method as templates to introduce different cell sizes and densities for PDMS-based materials. The density and EMI shielding performance of composites can be improved by adjusting the cell structure. Compared with the unfoamed MXene/PDMS composites, the composite foam in this work not only reduces the material density greatly but also improves the microwave absorption performance with smaller cell size. This method provides a simple and effective guide for changing material density and absorbing mechanism by introducing cell structure into polymer-based materials in the future.     

焦炭-水泥基复合材料电磁屏蔽性能的研究

研究了焦炭和碳纤维的掺量,焦炭细度,减水剂,样品厚度对材料电磁屏蔽性能的影响。分别利用两电极法和同轴电缆法测试了材料的电阻和电磁屏蔽效能。研究结果表明,增加焦炭的掺量对水泥基材料导电性能的影响不显著,但增加焦炭细度能明显提高水泥基材料的导电性能;而样品厚度对水泥基材料的电磁屏蔽性能影响不大;焦炭-水泥基材料掺入碳纤维后能使材料的导电性能和电磁屏蔽性能明显提高。