摘 要
,'Times New Roman';">電力變電箱對生活安全具有威脅性，如何提高變電箱耐熱防爆與抑制電磁波性能是重要居安議題。鉭(Ta)與鋁(Al)不僅具備優異EMI遮蔽性，亦可塗覆在不銹鋼板(304 S.S.)形成Ta/Al/S.S.多層結構而提升耐熱防爆與電磁波屏蔽效能。本研究利用電漿噴塗製備 Ta/Al/S.S.多層鍍膜結構從而檢討塗層組織與界面特性。另外，並導入濺鍍製程製備Ta/Al/Glass樣品量測奈米薄膜厚度效應對電磁波遮蔽特性之影響，進而應用到變電箱外殼設計。實驗結果顯示，Ta/Al/S.S.多層結構能提高不銹鋼板的機械性能(強化防爆性)。適當的電漿噴塗鋁層厚度能夠提高與不銹鋼基板的貼覆性，也能緩衝後續電漿噴塗鉭層的應力效應。透過多層鍍膜玻璃Ta/Al/Glass的EMI試驗發現，在中頻條件下，增加Ta層厚度不能有效改善全頻 EMI 遮蔽性；但在中頻條件下則有正面效益。此外，Ta/Al界面生成AlTaO化合物層能提高絕熱效應而降低熱導性。Ta/Al/S.S.多層結構特性優異可供大樓機房與基地台工程應用參考。
關鍵詞: 鉭-鋁、不銹鋼、電磁波遮蔽(EMI)、電漿噴塗Abstract
High–density Taiwan Power Company transformer box in residential areas are threatening to life safety. How to improve the thermal explosion–proof and electromagnetic interference (EMI) shielding suppression performance of transformer box is an important issue in residential safety. Tantalum (Ta) and aluminum (Al) not only have excellent EMI shielding, but also can be coated on a stainless steel plate (304 S.S.) to form a Ta/Al/S.S. multilayer structure to enhance the heat–resistant explosion–proof and electromagnetic wave shielding effectiveness. In this study, Ta/Al/S.S. multi–layer coating structure was prepared by plasma spraying to assess the coating structure and interface properties. In addition, the effect of the thickness effect of the nano film on the Ta/Al/Glass sample was measured and introduced into the sputtering process. The results of the experiment show that the Ta/Al/S.S. multilayer structure can improve the mechanical properties of the stainless steel sheet (enhance the explosion–proof property). Appropriate plasma sprayed aluminum layer thickness can improve the adhesion to the stainless steel substrate, and can also buffer stress effects of the subsequent plasma spray coating. Through the EMI test of multi–coated glass Ta/Al/Glass, it is found that increasing the thickness of Ta layer under medium frequency cannot effectively improve EMI shielding; but it has positive benefits in low– and high–frequency conditions. In addition, the formation of the AlTaO compound layer at the Ta/Al interface can improve the adiabatic effect and reduce the thermal conductivity. Ta/Al/S.S. Excellent structural characteristics of the multi–layer can serve as a model for the engineering room and base station engineering applications.
Keywords: Ta–Al, Stainless Steel, Electromagnetic Interference (EMI), Plasma Spraying