臺灣博碩士論文加值系統

摘要
隨著高科技的發展以及國際環保的日趨嚴格規範，以往具有最佳接點性能之銀-氧化鎘複合材料，因有鎘氣致癌的疑慮將被禁用，因此本研究將開發與銀-氧化鎘接點性能相當且價格便宜的新接點材料。
本研究內容以銀粉（粒徑2~4μm）添加氧化鋁粉末（粒徑0.5μm），經由自行開發之混合機加以混合均勻後，以粉末冶金法製成電氣接點試片。並使用開閉接點試驗機、靜態接點試驗機和掃描式電子顯微鏡探討在供應電壓、電流、定間隙及混合條件下，接點轉移損耗量、電弧能量和接觸電阻值以及損耗機制。結果發現在氧化鋁含4%wt時，有最佳的接點性能，且與市售不同接點之性能比較，發現銀基氧化鋁接點有良好的接點性能。

Abstract
With the development of new technology and the stringent requirement for the international environmental regulation, the silver-oxide cadmium composites with the best contact performance will be prohibited due to the anxiety to cause cancer. Therefore, this study intends to develop a new contact materials with the best contact performance and cost.
This study intends to use the silver powder (2~4μm) as the major component, and the alumina ceramic powders (0.5μm) as the minor component. The self-development mixer is used to uniformly mix silver powder with alumina powder, and then the powder metallurgy is used to make the electric contacts. Under the supply voltage and current, as well as the mixing conditions, the contact erosion amount, the arc energy, and the contact resistance are measured to investigate the erosion mechanism. Results show that the electric contact with 4%wt alumina ceramic powder has the best performance. Furthermore, the new electric contacts of silver base alumina composite material appear the acceptable performance compared with the commercial electric contacts.

總 目 錄
頁次
中文摘要i
總目錄ii
圖目錄v
表目錄xi
第一章 緒論1
1-1 研究動機1
1-2 文獻回顧4
1-2-2 接點材料損耗及轉移6
1-2-3 接點材料的特性8
1-3 本文重點…………………………………………………….10
第二章 混伴基本原理與電弧形成原理11
2-1 超微粒子的介紹11
2-1-1 超微粒子11
2-1-2 次粒子與2次粒子11
2-1-3 超微粒子的特性12
2-2 混合技術12
2-2-1 粉體混合概論12
2-2-2 混合機制13
2-2-3 兩種混合物之排列狀態16
2-2-4 影響粉末混合的因素18
2-2-5 粉末混合之方法19
2-3 電弧形成原理與種類25
2-3-1 長間隙之氣體崩潰25
2-3-2 電弧放電的過程28
2-3-3 架橋(bridge)的形成30
2-3-4 開離電弧的形成30
2-3-5 閉合電弧的形成34
第三章 實驗設備與方法35
3-1 實驗設備35
3-1-1 接點試片製作38
3-1-2 動態接點試驗43
3-1-3 靜態微間隙接點試驗50
3-2 銀基氧化鋁接點54
3-2-1 試片製作的材料及藥品54
3-2-2 粉末冶金55
3-3 實驗材料61
3-3-1 接點試片尺寸及其材料特性61
3-3-2 試片處理64
3-4 實驗條件68
3-5 實驗步驟70
第四章 實驗結果與討論74
4-1 混合均勻度的辨識74
4-2 乾、濕式混合結果75
4-3 添加不同分散劑對混合均勻度的影響84
4-4 不同均勻度之銀基氧化鋁接點試片損耗的再現性90
4-5 添加氧化鋁對銀接點燒結的影響94
4-6 自行開發接點混合結果與市售接點混合結果之比較95
4-7 不同氧化鋁含量的銀基接點之動態接點試驗結果與討論103
4-8 銀基氧化鋁接點與市售常用接點之動態接點試驗結果110
4-9 銀基氧化鋁接點與市售常用接點之靜態接點試驗結果討論115
第五章 結論128
參考文獻130

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