使用三種填料真空硬銲Inconel 600之研究

Abstract

板式熱交換器具有體積小、熱交換能力佳的優點，近年來在需要高效能散熱的領域中使用廣泛；其中，硬銲製程的技術是提升板式熱交換器性能的關鍵。目前板式熱交換器所使用的成熟技術，是以銅箔填料硬銲接合不鏽鋼，然而銅的抗蝕性較差，無法用在嚴苛的環境中；而為了改善抗蝕性而發展出的Inconel 625等材料製作的新式板式熱交換器，雖然可克服抗蝕性的問題，但依然有成本過高或耐壓性不足的問題。此篇研究以Inconel 600鎳基合金以Cu、VZ2106、MBF51三種填料進行硬銲接合，期望可以找出成本較低，且能抗蝕、耐高壓的新材料組合，幫助改善現有的材料製程。結果顯示以VZ2106或MBF51硬銲接合的銲道中，雖然產生BCr硼化物，但並未對銲道的機械強度或韌性產生嚴重影響，使此銲道具有接近Inconel 600基材的良好強度，為製作新式板式熱交換器可選擇的填料合金之一。

The plate heat exchanger is featured with compact size as well as high efficiency, so it is widely applied in the field of high-performance heat exchanger. The technology of brazing is one of the most important factors to improve performance of heat exchanger. The plate heat exchanger is currently made by Cu brazing stainless steels for most major heat exchanger manufacturers in the world. However, Cu cannot be used in severely corrosive environment due to its insufficient corrosion resistance. Other alloy such as Inconel 625 has good corrosion resistance, but it is suffered from high cost or insufficient pressure resistance. In this research, three kinds of fillers, Cu foil, Ni/Fe-based VZ2106 foil, and Ni-based MBF51 foil, are applied in brazing Inconel 600 substrate in order to develop novel plate heat exchangers featured with low cost, high pressure resistance and high corrosion resistance. Based on the experimental result, Inconel600/VZ2106/Inconel600 and Inconel 600/MBF51/Inconel 600 brazed joints include BCr precipitates, but brazed joints still have good bonding strength. The mechanical strength of VZ2106 and MBF51 brazed joints are close to that of Inconel 600 substrate, so they are good filler alloys applied in making novel plate heat exchangers.