臺灣博碩士論文加值系統

本研究係利用熔滲法，將三種不同粒徑之鎢粉末，依不同成形壓力與燒結溫度，製作W-15wt%Cu複合材料，比較其顯微結構、物理性質及機械性質，並藉由電弧沖蝕試驗，探討W/Cu複合材料抗電弧沖蝕之能力。
結果顯示，在氫氣氛中，以熔滲法製作W/Cu複合材料可達近似理論密度。而其熱膨脹係數，是隨著鎢粉顆粒減小而逐漸降低（7.61∼6.23×10-6/0C）。且鎢骨架彎曲強度，隨著鎢粉顆粒減小而增強，當鎢顆粒較細小（1μm及3μm）時，燒結程度達燒結中期階段，此時，燒結溫度為影響彎曲強度之主要因素；而鎢顆粒較粗大（21μm）時，燒結程度僅達燒結初期階段，此時，燒結溫度的影響不及成形壓力來得顯著。此外，細鎢顆粒之 W/Cu複合材料的破斷模式，主要是頸部斷裂與燒結後之顆粒間的穿晶劈裂為主，同時在鎢銅界面處，以沿晶破壞為主；而粗鎢顆粒之W/Cu複合材料的破斷面，除了頸部斷裂及穿晶劈裂外，由於未燒結之鎢顆粒被拉離，而形成凹洞。同時W/Cu複合材料之硬度值，與鎢顆粒大小成反比，顆粒愈小，硬度值愈高。經定距單弧沖蝕試驗，細鎢顆粒之W/Cu複合材料，其鎢骨架仍完整，而粗鎢顆粒之W/Cu複合材料的鎢顆粒有被沖蝕剝離現象，且經沖蝕後，粗鎢顆粒之W/Cu複合材料的表面粗度遠大於細鎢顆粒之W/Cu複合材料。

總 目 錄
謝誌……………………………………………………………………Ⅰ
摘要……………………………………………………………………Ⅱ
總目錄…………………………………………………………………Ⅲ
圖目錄…………………………………………………………………Ⅴ
表目錄…………………………………………………………………Ⅶ
一、 前言……………………………………………………………… 1
二、 文獻回顧與理論基礎…………………………………………… 3
2.1鎢銅複合材料之特性………………………………………… 3
2.2鎢銅複合材料之製程及其對性質之影響…………………… 3
2.3微量添加物之影響…………………………………………… 4
2.4燒結理論……………………………………………………… 5
2.4.1燒結驅動力……………………………………………… 5
2.4.2基本燒結機構…………………………………………… 6
2.4.3液相燒結之過程………………………………………… 7
2.5電接觸材料簡介……………………………………………… 9
2.5.1電接觸材料之性質要求………………………………… 9
2.5.2電接點之破壞模式……………………………………… 10
2.5.3鎢銅合金在電接觸材上之應用………………………… 12
2.6電弧沖蝕模式………………………………………………… 12
三、實驗方法與步驟………………………………………………… 29
3.1粉末、鎢骨架及鎢銅複合材料之製作……………………… 29
3.2物理性質量測………………………………………………… 32
3.2.1密度量測………………………………………………… 32
3.2.2熱膨脹係數量測………………………………………… 33
3.3機械性質試驗………………………………………………… 33
3.3.1彎曲試驗………………………………………………… 33
3.3.2硬度量測………………………………………………… 34
3.4電弧沖蝕試驗………………………………………………… 34
3.5微結構分析…………………………………………………… 35
四、結果與討論……………………………………………………… 50
4.1鎢骨架及鎢銅複合材料之微結構…………………………… 50
4.2物理性質分析………………………………………………… 51
4.3機械性質分析………………………………………………… 52
4.4電弧沖蝕試驗………………………………………………… 54
五、 結論..…………………………………………………………… 70
六、 參考文獻………………………………………………………… 71

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