- 學位論文
隔間牆粉光層結構與組成之改變對電磁波屏蔽效益影響之研究
The Effects of the Structures and Compositions on the Electromagnetic Shielding Effectiveness of Partition Wall Surface Plasters
摘要
本文係採用具導電性之碳纖維與導磁性之不?袗?纖維及錳鋅鐵氧磁體，添加於建築裝修用之樹脂益膠泥中，經均勻攪拌後，製作成具電磁波屏蔽性之黏著材料，且將每一粉光層厚度固定為2mm。探討添加不同含量之導電及導磁性材料對表面電阻係數與多層匹配之電磁波屏蔽效益及黏著強度之影響。 經由實驗結果顯示，不?袗?纖維、錳鋅鐵氧磁體所製成之粉光層，其表面電阻係數範圍介於107 ~ 109 Ω/□。以碳纖維所製成之粉光層表面電阻係數可達到5.03 × 100 Ω/□。此外，在電磁波屏蔽效益之測試上，添加導電性材料(碳纖維)之粉光層所呈現的電磁波屏蔽性皆優於添加導磁性材料(不鏽鋼纖維、錳鋅鐵氧磁體)之粉光層。碳纖維3.5wt%添加量及纖維長度2~3mm下，單層(2mm)的厚度下，頻率範圍在144MHz~3GHz之電磁波屏蔽效益可達20~55dB。導電與導磁性粉光層之相互匹配二層(4mm)及三層(6mm)結構下，其電磁波屏蔽效益最高可達35~68dB與35~75dB。而當導電與導磁性材料相互匹配時，明顯提高144MHz~450MHz之電磁波屏蔽效益，其屏蔽值可達35~75dB 。機械性質測試方面，導電或導磁性材料的添加會使樹脂益膠泥之黏著強度降低，碳纖維的添加導致其黏著強度降低25~55%，不?袗?纖維的添加導致其黏著強度降低5~50%，錳鋅鐵氧磁體的添加導致其黏著強度降低39~70%。預期此黏著材料可適用於塗抹在房屋牆壁粉刷，以隔絕家電用品或手機基地台所放出之電磁波。
並列摘要
Carbon fiber (CF)as the conductive material, stainless steel fiber(SSF) and Mn-Zn ferrite(MZF) as the permeability materials were used in this study and mixed them with polymerized tile gripper (PTG) to fabricate electromagnetic shielding effectiveness (EMSE) adhesive and mortared paste mortaring layer of the regular thickness 2mm. Furthermore, the effects of changing the combination of the conductive materials and permeability material categories, loading, and match position, to measure the surface resistivity (SR), EMSE and adhesive strength of the polymerized tile gripper in building were investigated. Experimental results indicated that the surface resistivity of SSF/PTG, MZF/PTG mortaring layers can be reached around 107 ~109Ω/□ and the CF/PTG mortaring layer will attain to 5.03 × 100Ω/□. On the other hand, the EMSE of the conductive mortaring layer is more superior to permeability mortaring layer. EMSE could reach 20 to 55dB in one plate (the thickness is 2mm) and the incident frequency from 144MHz to 3GHz with the added amount of 3.5wt% carbon fibers(the length is 2~3mm). Then, two mortaring layers (the thickness is 4mm) and three mortaring layers (the thickness is 6mm) with changing the combination of the conductive and polymerized materials categories, loading, and match position could reach 35 to 68dB of EMSE and 35 to 75dB respectively. The EMSE will be increased evidently from 144MHz to 450MHz of frequency when changing the combination of the conductive and polymerized materials categories, loading, and match position could reach 35 to 75dB . In mechanical property testing, the bonding strength of polymerized tile gripper will be decreased by increasing the added amount. The added of carbon fiber, stainless steel fiber and Mn-Zn ferrite will be decreasing 25~55%, 5~50% and 39~70% bonding strength. The adhesive materials can be mortared on wallboard, in order to shielding electromagnetic wave from the home appliance or cellular phone base stations.