ニッケル基自溶合金溶射皮膜の組織と生成相

概要

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The structure and constituents in two types of nickel-base self fluxing alloy coatings thermal sprayed and subsequently fused were precisely investigated by use of X-ray diffraction analysis, electron probe microanalysis, scanning electron microscopy and transmission electron microscopy. JIS-MSFNi1 alloy coating was composed of primary nickel solid solution and Ni_3B phase between primary nickel grains with a small amount of Ni-Ni_3B eutectic. In case of JIS-MSFNi4 alloy coating, lumpy crystals and two kinds of rod-like crystals appeared in addition to Ni-Ni_3B eutectic. It was found that the lumpy crystal is M_6C carbide containing chromium, molybdenum and nickel. The rod-like crystals are M_3B_2 boride of tetragonal structure and M_7C_3 carbide of hexagonal structure. Metal constitution of M_3B_2 are chromium and molybdenum and M_7C_3 contains mainly chromium. The nickel phase in the Ni-Ni_3B eutectic of MSFNi4 alloy coating has the superlattice structure.
2000-02-05