2011-05-012024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/682088摘要：鉬(Mo)和鎢(W)這兩種金屬均屬於具有高熔點的難熔金屬，故有良好的高溫強度。在實際的工程應用中，將可能遭遇到此類同質/異質材料間之接合問題。本研究主要針對兩種難熔金屬(鎢及鉬金屬)，發展出高溫同質/異質硬銲接合技術，以供國內使用此類材料之單位參考。研究中藉由接合界面顯微組織的觀察、元素定量與結構分析、機械性質測試與破壞分析等數據進行評估，以瞭解製程變數(如：硬銲溫度及時間等)對於銲後接點之品質的影響，並自實驗中進行最佳化，以求得較佳之製程參數。此外，本計劃亦將針對上述硬銲接點內，所生成的介金屬化合物之種類與成長動力學進行研究，配合ABAQUS電腦模擬試片經過硬銲製程後，接合界面之殘餘熱應力分佈及累計塑性應變的估算，將有助於瞭解硬銲接點的破壞機構。期望能夠藉由本研究開發出上述兩種材料組合之高溫硬銲製程。<br> Abstract: Mo and W are categorized as refractory metals with high melting points, and they possess good strength at elevated temperatures. The bonding of these dissimilar metals can be encountered in practical engineering applications. This research is primarily focused on developing the technology of brazing Mo and W metal for reference of domestic users. With aid of interfacial microstructural observations, quantitative chemical analysis, structural analysis, mechanical test and failure analysis, the effect of process variables, e.g., brazing temperature and time … etc., on the quality of brazed joint will be evaluated. Additionally, the brazing process is optimized from the experiment, and improved process variables are obtained. With aid of ABAQUS computer simulation, the residual thermal stresses and accumulated plastic deformation in joined specimens after brazing can be estimated, so the fracture mechanism of the brazement is elucidated. It is expected that high-temperature brazing process of Mo and W is developed from the study.硬銲鎢金屬鉬金屬顯微組織接合BrazingW metalMo metalMicrostructureBonding