Related Experiment Video
Updated: May 8, 2026

Preparation and Reactivity of Gasless Nanostructured Energetic Materials
Published on: April 2, 2015
Aluminate/cobalt composites developing for elevated-temperature and high-efficiency electromagnetic absorbing (EMA)
Zhen-Jie Guan1, Bo-An Yang2, Yong Yuan3
1School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China.
Abstract:
It is increasingly urgent to develop EMA materials that combine elevated-temperature and high-efficiency absorbing performances. Herein, aluminate/Co composites were prepared through mechanical mixing and hydration hardening. The microstructures of the specimens were controlled by adjusting the shape of Co particles, and cordierite particles were added to further regulate the distribution of Co particles. Flake-shaped Co particles exhibit superior electromagnetic parameters, while the excessively high conductivity of Co flakes filled specimens leads to a significant degradation in their impedance matching, resulting in a rapid attenuation of the electromagnetic performances. The temperature-dependent ionic conductivity plays an important role in controlling the elevated-temperature conductivity and can be suppressed by adding a second dielectric component. For a 2 mm specimen, the maximum reflection loss (RL max) reaches -13.1 dB, and the effective absorption bandwidth (RL < -5 dB, ERL 5) covers the entire X band at 500°C, presenting great potential for developing into elevated-temperature and high-efficiency EMA materials.
More Related Videos
11:50Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
Published on: June 13, 2015
14:51An Available Technique for Preparation of New Cast MnCuNiFeZnAl Alloy with Superior Damping Capacity and High Service Temperature
Published on: September 23, 2018
Related Concept Videos
Dual Nature of Electromagnetic (EM) Radiation
Wavelength is the distance between two consecutive peaks (the highest point) or troughs (the lowest point) in the wave. Frequency is the number of...
Radiation: Applications
The average...
Eddy Currents
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
Back EMF
Generating Electromagnetic Radiations
Atomic Emission Spectroscopy: Lab