MLCC（Multilayer Ceramic Capacitor）即多層陶瓷電容器是目前最常見的電容之一，應用在許多電子元件上面，如手機、電動車、電路板等，隨著環保意識抬頭，電動車逐漸取代燃油車，造就更多MLCC需求，然而MLCC主要的介電材料是鈦酸鋇，因為材料與製程限制，面臨到無法降低介電厚度、電容值隨溫度變化太大以及漏電流的因素，因此本實驗對介電材料提出創新的見解，利用晶界電容的概念，搭配鋁粉本身的核殼結構，以及鋁熱反應三種概念相互組合，讓介電材料既能夠維持晶界結構，又能讓介電厚度降低，還能夠讓能隙寬度較高的氧化鋁做為介電層，因此透過本實驗相研究鋁粉的核殼core shell結構以及絕緣特性，對鋁粉做一些可行性的評估。研究發現鋁層以及氧化銅層無法完成完全使鋁產生完全絕，還需要添加銅使其事先氧化，在與鋁進行鋁熱反應，才能夠生成絕緣性質高的核殼結構晶界電容。

MLCC (Multilayer Ceramic Capacitor) is one of the most common capacitors used in many electronic components, such as cell phones, electric cars, circuit boards, etc. With the rise of environmental awareness, electric cars are gradually replacing fuel cars, creating more demand for MLCC. However, the main material for MLCC is barium titanate, because of the material and process limitation, it is unable to reduce the thickness of the boundary charge, the capacitance value changes too much with temperature, and the leakage current, therefore, this experiment proposes a subversive solution for the boundary charge material, using the concept of grain boundary capacitance, the core shell structure of aluminum powder itself, and the combination of three concepts of aluminum thermal reaction, so that the boundary charge material can not only maintain the grain boundary structure, but also allow the thickness of the boundary charge to be reduced, and the higher gap width of alumina can be used as the boundary charge layer. Therefore, the core shell structure and the insulation characteristics of aluminum powder are investigated in this experiment. It is found that the aluminum layer and the copper oxide layer cannot completely insulate the aluminum, and it is necessary to add copper to make it oxidize beforehand and then react with aluminum in the thermite reaction to generate the grain boundary capacitance with high insulating property.

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