2012-03-152024-05-17https://scholars.lib.ntu.edu.tw/handle/123456789/682096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，例如：製作高發射電流密度之儲存式熱陰極供關鍵微波元件使用。本研究主要針對兩種難熔金屬(多孔鎢及鉬金屬)，發展出雷射熔接技術，以供國內使用此類材料之單位參考。研究中藉由雷射熔接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(如：微硬度量測、拉伸測試)與破壞分析等數據進行評估，以瞭解雷射熔接製程參數(如：填料種類、雷射功率、雷射移動速度…等)，對於雷射熔接後接點品質的影響，並自實驗中進行雷射熔接製程之最佳化，以求得最佳之製程參數。故期望能夠藉由本研究，開發出上述鉬金屬及多孔鎢之同質/異質組合之雷射熔接製程。<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, for instance: the manufacture of high-emission current density hot cathode applied in key microwave element. This research is primarily focused on developing laser fusion bonding Mo and porous W metals for reference of domestic users. With aid of interfacial microstructural observations, quantitative chemical analyses, structural analyses, mechanical tests including microhardness tests as well as tensile tests and failure analyses, the effect of laser fusion process variables, e.g., types of filler metals, power and travel speed of laser … etc., on the quality of joint will be extensively evaluated. Accordingly, the laser fusion process is optimized from the experiment, and improved laser fusion process variables are obtained. It is expected that the technology of laser fusion bonding Mo and porous W is developed from the study.雷射熔接多孔鎢鉬金屬顯微組織接合強度Laser fusionPorous WMo metalMicrostructureBonding strength