Characteristic Evaluation of Multiple Layers Microwave Absorber Coated with Biomass Composite

2016 ◽  
Vol 850 ◽  
pp. 88-92 ◽  
Author(s):  
Hasnain Abdullah ◽  
Asmalia Zanal ◽  
Mohamad Hakim Ahya Ilmudin ◽  
Mohd Nasir Taib ◽  
Juliana Md Sharif ◽  
...  
Keyword(s):  
Composite Material ◽  
Electromagnetic Wave ◽  
Composite Materials ◽  
Free Space ◽  
Measurement Method ◽  
Microwave Absorber ◽  
Dielectric Measurement ◽  
Space Environment ◽  
Absorbing Material ◽  
Performance Development

Radiation Absorbing Material (RAM) is used to absorb radiations of electromagnetic wave surrounding us. Thus, the multiple layers’ microwave absorber using biomass composite materials could be one of the solutions to address the problem. In order to effectively absorb the radiation of electromagnetic wave, the multiple layers’ absorber is characterized to optimize the performance of the absorber. The characterization is made by varying biomass composite material contents, thickness and other possible considerations. CST Microwave Studio software is first used to design and simulate the multiple layers’ absorber to estimate its performance. Development of multiple layers’ prototype is carried out to test its performance at free space environment. Free space dielectric measurement method is used to determine the value of multiple layers’ absorber dielectric. The dielectric value is then used in CST software in order to make the simulation more precise. Free space arch which is connected to Agilent Analyzer is used to measure absorption of multiple layers’ microwave absorber.

scholarly journals Microwave Absorber Properties of Magnetic (Fe) and Dielectric (TiO2) Composite Materials for ETC in Free-Space

2009 ◽  
Vol 56 (4) ◽  
pp. 149-155 ◽  
Author(s):  
YoungJoon An ◽  
Ken Nishida ◽  
Takashi Yamamoto ◽  
Shunkichi Ueda ◽  
Takeshi Deguchi
Keyword(s):  
Composite Materials ◽  
Free Space ◽  
Microwave Absorber

Prediction of Long-Term Creep Behavior of High Performance Composite Material for Spacecraft

2016 ◽  
Vol 689 ◽  
pp. 93-97
Author(s):  
Kyung Ju Min ◽  
Ji Ung Choi ◽  
Ho Sung Lee
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Creep Behavior ◽  
High Performance ◽  
Temperature Shift ◽  
Analysis Data ◽  
Space Environment ◽  
High Performance Composite ◽  
Term Creep

Even though carbon/epoxy composite materials have been widely used in aircraft for many years, different requirements are often required for composite materials in spacecraft application due to the space environment. Some of the considerations include modulus and thermal properties for spacecraft while as strength is important for aircraft. For heat pipe panels, space radiator, antennas or optical benches, thermal stability is required for the life of the satellite. In this study, long term creep behavior of high performance composite material is investigated with time-temperature shift factor. The fiber is pitch-based carbon which shows high thermal conductivity and high modulus. It was possible to predict creep compliance after 5 years from dynamic mechanical analysis data. This information is useful to understand the property change during the intended service life of the spacecraft.

Study of the Composite Materials Optimal Structure Containing a Hollow Aluminum and Silica Microsphere Dependence on Humidity

2020 ◽  
Vol 12 ◽  
Author(s):  
Alexandra Atyaksheva ◽  
Yermek Sarsikeyev ◽  
Anastasia Atyaksheva ◽  
Olga Galtseva ◽  
Alexander Rogachev
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Strength Function ◽  
Theory And Practice ◽  
Optimal Structure ◽  
Optimal Size ◽  
Structure And Properties ◽  
Power Functions ◽  
Silica Microsphere ◽  
Heat Engineering

Aims:: The main goals of this research are exploration of energy-efficient building materials when replacing natural materials with industrial waste and development of the theory and practice of obtaining light and ultra-light gravel materials based on mineral binders and waste dump ash and slag mixtures of hydraulic removal. Background.: Experimental data on the conditions of formation of gravel materials containing hollow aluminum and silica microsphere with opportunity of receipt of optimum structure and properties depending on humidity with the using of various binders are presented in this article. This article dwells on the scientific study of opportunity physical-mechanical properties of composite materials optimization are considered. Objective.: Composite material contains hollow aluminum and silica microsphere. Method.: The study is based on the application of the method of separation of power and heat engineering functions. The method is based on the use of the factor structure optimality, which takes into account the primary and secondary stress fields of the structural gravel material. This indicates the possibility of obtaining gravel material with the most uniform distribution of nano - and microparticles in the gravel material and the formation of stable matrices with minimization of stress concentrations. Experiments show that the thickness of the cement shell, which performs power functions, is directly related to the size of the raw granules. At the same time, the thickness of the cement crust, regardless of the type of binder, with increasing moisture content has a higher rate of formation for granules of larger diameter. Results.: The conditions for the formation of gravel composite materials containing a hollow aluminosilicate microsphere are studied. The optimal structure and properties of the gravel composite material were obtained. The dependence of the strength function on humidity and the type of binder has been investigated. The optimal size and shape of binary form of gravel material containing a hollow aluminosilicate microsphere with a minimum thickness of a cement shell and a maximum strength function was obtained. Conclusion.: Received structure allows to separate power and heat engineering functions in material and to minimize the content of the excited environment centers.

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