The purpose of this experiment is to make self fluxing nickel alloy for trial as a basis of eventual industrial production. Alloying elements were charged in a vacuum melting furnace, using Ni-B, Fe-B and metallic boron as boron source.
The melt was cast and then pulverized by atomizing process. The powder was sprayed to the coating 1-1.5mm thick, which was investigated concerning self fluxing, and corrosion and heat resistivity, comparing with the Colmonoy No. 6, Metco 16C and 14C.
The result was as follows:
1) The specimens melted with Fe-B and Ni-B (thermit) were rather difficult in metallizing and its high aluminum content and made its melting point high.
2) The specimens melted with the metallic boron and Ni-B (deoxidization by silicon) were easy in metallizing.
3) With Geiger counter X ray diffractiometer the characteristic lines of CrB, Cr
2B and Cr
3B
4 were observed with all the powders.
4) Corrosion resistivity in HCl and H
2SO
4 acid solution of the metallized specimen is much higher than that of 18-8 stainless steel.
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