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Electromagnetic shielding efficiency of the electric field of charcoal from six wood species.pdf

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Electromagnetic shielding efficiency of the electric field of charcoal from six wood species

NOTE J Wood Sci (2003) 49:450–454 ? The Japan Wood Research Society 2003 DOI 10.1007/s10086-002-0506-6 Song-Yung Wang · Chung-Pin Hung Electromagnetic shielding efficiency of the electric field of charcoal from six wood species Received: January 18, 2002 / Accepted: November 25, 2002 Abstract Six wood species were carbonized under various carbonization temperatures and nonoxygen conditions to obtained charcoal. The effects of wood species, rate of tem- perature rise, and carbonization temperature on the elec- tromagnetic shielding efficiency (ESE) of the electric field were investigated. The wood species used in this study were Japanese cedar, China fir, western hemlock, red oak, for- tune paulownia, and Taiwan acacia. Tested materials were carbonized in a high-temperature oven under the following conditions: rate of temperature rise 1°–5°C/min; carboniza- tion temperature 500°–1100°C, with temperature intervals of 100°C; maximum temperature maintained for 1h; and flow rate of nitrogen 300ml/min. The electromagnetic insu- lation strength system was used to detect the ESE of the electric field of charcoal. It was found that western hemlock and fortune paulownia charcoal showed maximum ESE values of of 36 and 61dB generated at a carbonization tem- perature of 1000°C. The charcoals derived from four other wood species showed maximum ESE values of 28dB for Japanese cedar, 23dB for China fir, 32 dB for red oak, and 38dB for Taiwan acacia, respectively, at a carbonization temperature of 1100°C. The ESE value for fortune pau- lownia charcoal was similar to those of metal nets. The relations between ESE and logarithmic values of resistivity (logr) could be represented by a negatively exponential formula. Key words Electromagnetic shielding efficiency (ESE) · Charcoal · Carbonization temperature · Rate of tempera- ture rise · Resistivity S.-Y. Wang · C.-P. Hung (*) Department of Forestry, College of Agriculture, National Taiwan University, No. 1, Section 4, Roosevelt Road, T