以B、P、Si元素為低溫助劑的低融點鎳基合金是常應用於鑽石工具的硬銲填料，尤其是鑽石與添加活性元素Cr的鎳基合金硬銲後，附著穩固，展現出良好的性能。因此本研究主要比較三種不同鎳基硬銲合金，分別為Ni-7Cr-3Fe-3B-4.5Si、Ni-11P及Ni-14Cr-10P合金，探討不同成分的鎳基合金對硬銲鑽石顆粒表面微結構之影響及差異。實驗結果顯示，以SEM觀察合金微結構變化，發現含有活性元素Cr的鎳基合金會在鑽石表面產生相變化，形成一碳化鉻層，保護鑽石阻止Ni元素的入侵，避免鑽石顆粒劣化；而未含活性元素Cr的鎳基合金，則是造成鑽石顆粒完全的劣化。Ni-Cr二元合金的熔點高於1400℃，若在此溫度下進行硬銲的操作，鑽石會快速劣化，讓鑽石強度嚴重降低，故添加功能有如助銲劑的B、P、Si元素來降低合金熔點，不僅增加合金融化的流動能力，更可避免鑽石的劣化。以XRD分析鑽石顆粒表面碳化物析出型態與其成分，證實與Ni-7Cr-3Fe-3B-4.5Si及Ni-14Cr-10P合金燒結過後的鑽石顆粒表面皆產生碳化鉻相，此碳化鉻相可有效增進銲料對鑽石的界面結合強度，大幅提升銲料抓持鑽石的效果。

　　Brazing diamond using nickel-based alloys are widely practiced, and it is well known that the bond strength between the diamond grits and the brazing matrix can vary significantly. The addition of an active element, such as Cr, to the Ni-based brazing alloy , causes the Cr segregation of the brazing interface and the formation of carbide phases. Chromium carbide layer avoids the transformation of diamond into graphite and possibly increased the bonding strength between the matrix and diamond grits. However, the eutectic temperature of Ni-Cr is higher than 1400℃, which can easily transform diamond into graphite. Melting point reducing elements, such as B, Si, and P are widely used to reduce the melting points of the Ni-Cr alloys. In this study, three different nickel-based alloys are used to braze diamond grits, including Ni-11P, Ni-14Cr-10P, and Ni-7Cr-3Fe-3B-4.5Si (wt.%). The effects of carbide former (Cr), and melting temperature reducer (B, Si, and P) on the integrity of diamond grits were investigated. The experimental results show that two different chromium carbide phases, including Cr7C3 and Cr3C2, were found near the interface between Ni-14Cr-10P , Ni-7Cr-3Fe-3B-4.5Si (wt%) brazing alloy and diamond grits, and the Ni-11P alloy transformed diamond into graphite, when the brazing practice was carried out at 980℃. The brazing temperature was obviously reduce, when the addition of B, Si, and P
elements to the Ni-based brazing alloy.

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