Ni53Nb20Ti10Zr8Co6Cu3(at.%) master alloy was prepared by induction-melting of high-purity elemental constituents (Ni: 99.9%, Nb: 99.7%, Ti: 99.9%,Zr: 99.8%, Co: 99.9%, and Cu: 99.999%) in a yttria-stabilized zirconia crucible under an argon atmosphere. The powders were produced by high-pressure Ar gas atomization at a dynamic pressure of 8.1 MPa using a close-coupled annulus nozzle with a melt delivery inner diameter of 3 mm. The atomized powders were sieved according to conventional sieve analysis and divided into different size ranges. A SEM micrograph of the as-atomized powders with particle sizes inthe range of <45um, which were used for the HV AF thermal spraying onto stainless steel substrates (1Cr18Ni9Ti), is given in Fig. 1. It shows that most of the particles are in near-spherical forms along with some satellites attached. The details of HV AF process has been described elsewhere. The substrate was degreased by acetone, dried in air, and then grit-blasted for spraying. The spraying parameters for HV AF process are presented in Table 1.
Fig. 1. SEM micrograph of the as-atomized powders with particles size less than 45um.
Table 1
Spraying parameters employed in the HV AF process
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