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

Abstract

In the present study, we investigated the feasibility of inhibiting high-temperature oxidation of Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder by depositing nickel–phosphorus on Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder. A Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder was produced by a gas-atomization technique, and subsequently, nickel–phosphorus was deposited on Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder by electroless plating. Fully amorphous Ni 57Zr 20Ti 18Si 3Sn 2 powder could be successfully obtained with a particle size smaller than 75 μm and exhibits a glass transition temperature ( T g) of 828 K, an onset crystallization temperature ( T x) of 886 K and a supercooled liquid region (Δ T) of 58 K. Electroless plating yielded a complete and uniform deposition of nickel–phosphorus on Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder. The coated nickel–phosphorus deposit can reduce the oxidation of Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder remarkably at the consolidation temperature of Ni 57Zr 20Ti 18Si 3Sn 2 amorphous powder.