Electromagnetic Shielding effect of Carbonized laminated bamboo board.

in National workshop (full text oral presentation), 國內研討會(全文口頭發表)
標題Electromagnetic Shielding effect of Carbonized laminated bamboo board.
Authors1998/3, 王秀華

Laminated bamboo boards (LBB) 15-35 mm thick, made from 3-7 layers of phenol-formaldehyde resin pre-impregnated moso bamboo veneers were carbonized at 600 to 1,000℃, with temperature increasing at 100℃ intervals, for a retention time of 1-3 hours. The objective of this study was to examine the effects of carbonization conditions on the electromagnetic shielding effectiveness of the boards.
The carbide yield of the LBB decreased with increasing carbonization temperature. The higher the temperature, the lower the yield. Carbonized laminated bamboo board displayed greater electrical conductivity when it was produced at higher carbonization temperature. Specimen thickness and temperature retention time showed significant negative correlation with the resistivity of the carbonized laminated bamboo board (CLBB). CLBB manufactured at the designated conditions could be categorized as semiconductor-like products. Specimen thickness, retention time, and carbonization temperature were significantly correlated with the electromagnetic shielding effect of the CLBB. The resistivity was, on the contrary, significantly negatively correlated with electromagnetic shielding power. Most of the tested CLBB met the third and above level electromagnetic shielding requirements and was classified as regular grade.
The interlayer space in the crystalline structure of CLBB decreased with increasing carbonization temperature , while the diffraction angle showed a reverse effect.

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