Electroless nickel-phosphorus plating on Ni-Zr-Ti-Si-Sn amorphous powder

In the present study, we investigated the feasibility of inhibiting high-temperature oxidation of Ni57Zr20Ti18Si3Sn2 amorphous powder by depositing nickel-phosphorus on Ni57Zr20Ti18Si3Sn2 amorphous powder. A Ni57Zr20Ti18Si3Sn2 amorphous powder was produced by a gas-atomization technique, and subsequently, nickel-phosphorus was deposited on Ni57Zr20Ti18Si3Sn2 amorphous powder by electroless plating. Fully amorphous Ni57Zr20Ti18Si3Sn2 powder could be successfully obtained with a particle size smaller than 75 μm and exhibits a glass transition temperature (Tg) of 828 K, an onset crystallization temperature (Tx) of 886 K and a supercooled liquid region (ΔT) of 58 K. Electroless plating yielded a complete and uniform deposition of nickel-phosphorus on Ni57Zr20Ti18Si3Sn2 amorphous powder. The coated nickel-phosphorus deposit can reduce the oxidation of Ni57Zr20Ti18Si3Sn2 amorphous powder remarkably at the consolidation temperature of Ni57Zr20Ti18Si3Sn2 amorphous powder.