本研究將利用化學還原法製備奈米級銀銅相合金粉末並添加於市售牙科用銀粉汞齊合金粉末中，藉以製造奈米銀粉汞齊合金並提升銀粉汞齊材料之抗腐蝕特性 。以市售的牙科用銀粉合金粉末(World-Cap®) 作為對照組，於市售粉末中分別添加5wt.% 與10wt.%之銀銅相奈米粉末作為實驗組。實驗粉末分別利用X光繞射儀、穿隧式電子顯微鏡、掃描式電子顯微鏡以及電子微探儀進行特性分析。藉由穿隧式電子顯微鏡影像分析得知銀銅相奈米粉末的尺度平均約為30奈米。由能量分佈能譜儀定量銀銅相奈米粉末之成分別為56.28 at.%的銀與43.72 at.%的銅。添加銀銅相奈米粉末之汞齊的零電流電位較傳統市售汞齊材料較高，且在 −325 mV處並無發現由銀汞相與Cu6Sn5所貢獻的反應。此性質顯示市售汞齊填補材料之抗腐蝕特性可藉由銀銅相奈米粉末的添加而顯著提升。

The aim of this study was to introduce Ag–Cu phase nanopowder as an additive to improve the corrosion behavior of conventional dental amalgams. A novel Ag–Cu nanopowder was synthesized by the precipitation method. An amalgam alloy powder (World-Cap®) was added and mixed with 5 wt.% and 10 wt.% of Ag–Cu nanopowders, respectively, to form experimental amalgam alloy powders. The original alloy powder was used as a control. Alloy powders were examined using X-ray di raction, transmission electron microscopy (TEM), scanning electron microscopy and electron probe microanalysis. Amalgam disk specimens of metallurgically prepared were tested in 0.9% NaCl solution using electrochemical methods. The changes in the corrosion potential and anodic polarization characteristics were determined. The diameters of lamellar structure Ag–Cu nanoparticles were measured to be approximately 30 nm. The composition of the Ag–Cu nanoparticles determined by TEM–energy-dispersive spectroscopy was 56.28 at.% Ag–43.72 at.% Cu. A light-shaded phase was found mixing with dark Cu–Sn reaction particles in the reaction zones of Ag–Cu nanoparticle-doped amalgams. The Ag–Cu nanoparticle-doped amalgams exhibited zero current potentials more positive than the control and no current peak was observed at −325 mV that related to Ag–Hg phase and Cu6Sn5 phase in anodic polarization curves. The results indicated that the corrosion resistance of high-copper single-composition amalgam could be improved by Ag–Cu nanoparticle-doping.