2005-08-012024-05-18https://scholars.lib.ntu.edu.tw/handle/123456789/705809摘要：Ti-6Al-4V是屬於一種α-β鈦合金，可經由適當的熱處理而強化。由於具有優異的銲接及成形性，使其成為一種非常重要的鈦合金。鉬(Mo)和鈮(Nb)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，將可能遭遇到此類異種材料間之接合問題(例如：製作火箭的燃燒室)。本研究主要目的在於以真空硬銲製程(包含傳統真空硬銲及紅外線硬銲)，分別接合Ti-6Al-4V及上述兩種難熔金屬(TZM合金及鈮金屬)。計劃擬以三年為期，計劃中的第一年將進行真空硬銲Ti-6Al-4V及TZM合金，硬銲填料之選擇是以銀基硬銲合金為主。此階段主要的研究目標是藉由真空硬銲製程，在Ti-6Al-4V與TZM合金之間形成一個氣密的接點。計劃中的第二年是以真空硬銲Ti-6Al-4V及鈮金屬為主，至於硬銲填料之選擇仍然是以銀基硬銲合金為優先。與第一年的目標類似，本階段主要的研究標的是藉由真空硬銲製程在Ti-6Al-4V與鈮金屬之間形成一個氣密的接點。計劃中的第三年則是分別以真空硬銲製作Ti-6Al-4V與上述兩種難熔金屬之氣密且耐高溫的接點，此處硬銲填料之選擇是以Ti-Cr-V硬銲合金為主。此外，本<br> Abstract: Ti-6Al-4V is a type of α-β titanium, which can be strengthened by the appropriate heat treatment. It is a very important titanium alloy due to its excellent weldability and formability. Both Mo and Nb are categorized as refractory metals with high melting points, so they possess good strength at elevated temperatures. The bonding of these dissimilar metals can be encountered in practical engineering applications, e.g. the manufacturing of missile combustion chambers. The purpose of this research is focused in vacuum brazing, including traditional vacuum brazing and infrared brazing, Ti and the above two refractory metals (TZM alloy and Nb) in the period of three years. In the first year, the project concentrates on vacuum brazing of Ti-6Al-4V and TZM alloy, and the silver-based braze alloys are selected as brazing fillers. The formation of a gas-tight joint between Ti-6Al-4V and TZM is the primary goal at this stage. In the second year, the project mainly concentrates on vacuum brazing of Ti-6Al-4V and the Nb metal, and the silver-based braze alloys are also selected as brazing fillers. In the third year, the joints between Ti-6Al-4V and the above two refractory metals featured with gas-tight and heat-resistance will be made by vacuum brazing, respectively. Ti-Cr-V braze alloys are chosen as brazing fillers. Additionally, the project is focused in the species and growth kinetics of the interfacial intermetallic compounds in the brazement. With aid of ABAQUS computer simulation, the residual thermal stresses and accumulated plastic deformation, including the creep strains, in specimens after brazing, shear test and thermal fatigue tests can be estimated, so the fracture mechanism of the brazement is elucidated. It is expected that the optimized vacuum brazing process variables can be developed in the study.真空硬銲鈦合金難熔金屬界面熱疲勞vacuum brazingtitanium alloysrefractory metalsinterfacethermal fatigue