scholarly journals Electromagnetic Shielding Performance of Nickel Plated Expanded Graphite/Wood Fiber Composite

BioResources ◽  
2016 ◽  
Vol 11 (2) ◽  
Author(s):  
Yi Chen ◽  
Chuwang Su ◽  
Quanping Yuan ◽  
Manjun Zhan ◽  
Bing Yang ◽  
...  
Keyword(s):  
Fiber Composite ◽  
Wood Fiber ◽  
Expanded Graphite ◽  
Electromagnetic Shielding

Aluminum and copper deposition through the process of thermal flame spray on polypropylene-pine wood fiber composite filaments and their applications

2021 ◽  
pp. 002199832110365
Author(s):  
Sônia MA Veroneze ◽  
Thais HS Flores-Sahagun ◽  
Ramón SC Paredes ◽  
Kestur Gundappa Satyanarayana
Keyword(s):  
Fiber Composite ◽  
Wood Fiber ◽  
Physical And Mechanical Properties ◽  
Heat Treating ◽  
Flame Spray ◽  
Pine Wood ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Copper Coatings ◽  
Study Results

This paper presents a study about polypropylene-pine wood composites, both as filaments and products, coated with aluminum (Al) or copper (Cu), obtained through flame thermal spray process after subjecting the composites to thermal treatments in the second and third step of the study. Results revealed that a previous aluminum layer was needed in order to obtain copper coatings on the composites. The physical and mechanical properties of both metal coated composite filaments were also evaluated and compared with the uncoated composite filaments with and without heat treating these. Consequently, it was observed that the nature of the coating adhesion on the substrates was mechanical, and therefore abrasion blasting of filaments or the use of a higher wood fiber content in the composite improved the Al or Cu adhesion. Also, it was observed that extruded wood fiber/PP filaments should not be cooled in water because pieces might be molded directly once the moisture affects the metal coatings adhesion onto the substrates.

scholarly journals Role of Wood Fibers in Tuning Dynamic Rheology, Non-Isothermal Crystallization, and Microcellular Structure of Polypropylene Foams

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 106 ◽  
Author(s):  
Yongming Song ◽  
Youyong Wang ◽  
Hao Li ◽  
Qiling Zong ◽  
Ailing Xu
Keyword(s):  
Isothermal Crystallization ◽  
Fiber Composite ◽  
Cell Structure ◽  
Wood Fiber ◽  
Crystallization Rate ◽  
Complex Viscosity ◽  
Expansion Ratio ◽  
Wood Fibers ◽  
Cell Nucleation ◽  
Composite Foams

Microcellular polypropylene (PP)/wood fiber composite foams were fabricated via batch foaming assisted by supercritical CO2 (scCO2). Effects of wood fibers on rheology, crystallization, and foaming behaviors of PP were comprehensively investigated. The obtained results showed that the incorporation of wood fibers increased the complex viscosity and the storage modulus of the PP matrix. Jeziorny’s model for non-isothermal crystallization kinetics indicated that wood fibers did not change the crystal growth. However, the crystallization rate of the PP matrix was decreased to a certain extent with increasing wood fiber loadings. The wood fiber exerts a noticeable role in improving the cell density and reducing the cell size, despite decreasing the expansion ratio. Interestingly, a “small-sized cells to large-sized cells” gradient cell structure was found around the wood fibers, implying cell nucleation was induced at the interface between wood fiber and PP matrix. When wood fiber loadings were specifically increased, a desirable microcellular structure was obtained. However, further increasing the wood fiber loadings deteriorated the cell structure. Moreover, the crystallinity of the composite foams initially decreased and then slightly increased with increasing wood fiber loadings, while the crystal size decreased.

Simulation and experimentation of wide frequency electromagnetic shielding coating used for carbon fiber composite materials of track vehicles

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940020 ◽  
Author(s):  
Ming Gong ◽  
Shou-Guang Sun ◽  
Lin Sun ◽  
Ai-Qin Tian ◽  
Qiang Li
Keyword(s):  
Computer Simulation ◽  
Composite Materials ◽  
Carbon Fiber ◽  
Fiber Composite ◽  
Electromagnetic Shielding ◽  
Shielding Effectiveness ◽  
Frequency Range ◽  
Simulation Technology ◽  
Carbon Fiber Composite ◽  
Fiber Composite Materials

Computer Simulation Technology EM and Computer Simulation Technology Microwave Studio electromagnetic simulation software were used to simulate the carbon fiber composite materials with a new type of wide frequency electromagnetic shielding coating. DC magnetic field, low-frequency electromagnetic fields, and mid-high frequency electromagnetic shielding effectiveness analysis model were established in order to study the influence of permeability, conductivity, coating thickness and other parameters in the typical frequency range research on the shielding effectiveness. The results show that the composite coating material with reasonable design can effectively enhance the electromagnetic shielding performance of carbon fiber composite materials in the DC [Formula: see text]18 GHz frequency range.

Flexible polyaniline-coated poplar fiber composite membranes with effective electromagnetic shielding performance

Vacuum ◽  
2019 ◽  
Vol 170 ◽  
pp. 108990 ◽  
Author(s):  
Kun Zhang ◽  
Xue Gu ◽  
Qian Dai ◽  
Bingnan Yuan ◽  
Yue Yan ◽  
...  
Keyword(s):  
Fiber Composite ◽  
Composite Membranes ◽  
Electromagnetic Shielding

Foaming of PPC/Wood Fiber Composite Using Moisture Contained in Wood as Blowing Agent

2013 ◽  
Vol 415 ◽  
pp. 631-635
Author(s):  
Li Tao Guan ◽  
Chong Ling Yang ◽  
Na Xin Yuan ◽  
Di Wu Xie
Keyword(s):  
Moisture Content ◽  
Fiber Composite ◽  
Orthogonal Design ◽  
Wood Fiber ◽  
Fiber Content ◽  
Foam Density ◽  
Blowing Agent ◽  
Die Temperature ◽  
The Relationship

The processing of PPC/wood fiber foam composites using moisture as blowing agent was studied in this manuscript. Three important factors, such as: moisture content, wood fiber content and extruder die temperature were investigated with orthogonal design. The relationship between each factor and foam density was revealed, as well as the foaming mechanism was obtained.

A Mössbauer investigation of nano-NiFe alloy/expanded graphite for electromagnetic shielding

2016 ◽  
Vol 27 (6) ◽  
Author(s):  
Wei Liu ◽  
Yu-An Huang ◽  
Lai Wei ◽  
Ya Zhai ◽  
Rui-Li Zhang ◽  
...  
Keyword(s):  
Expanded Graphite ◽  
Electromagnetic Shielding

scholarly journals Impacts of Limestone Particle Size on the Performance of Flexible Wood Fiber Composite Floor

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Hongcheng He ◽  
Jinling Nie ◽  
Jing Wang
Keyword(s):  
Particle Size ◽  
Fiber Composite ◽  
Wood Fiber ◽  
Limestone Powder ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Formaldehyde Release ◽  
Wood Floor ◽  
The World ◽  
Hemp Hurd

Sustainable wood floor (WFF), produced from natural plants, is a sort of novel green and ecofriendly composite floor, which has been attracting more and more attention in the world. WFF also gives a solution of utilizations of agricultural wastes, such as bamboo mats and hemp hurd. The additive limestone powder plays key role in the performance of flexible bamboo composite floor, so, in this paper, the effects of limestone size and size distributions were investigated. The best particle size distributions of limestone are 25 wt% of 48 μm, 25 wt% of 106 μm, and 50 wt% of 160 μm. The as-obtained WFF has good elasticity, good affinity, and strong comfortableness as well as free formaldehyde release.

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