Abstract
Flame-sprayed Fe40Ni40B20 alloy coatings have a mainly amorphous structure with a small amount of fine, 0.5- to 1-μm.crystalline inclusions. The crystalline phases are (Fe, Ni)3B and Fex Ni23-xB6. The structure of the precipitated crystalline inclusions in the amorphous matrix is not related to that of the eutectic of the starting alloy powder used for spraying. In the direction from the base to the free surface the coating structure varies: The volume concentration of the crystalline phases changes, which is reflected in the emission of secondary ions of the main components of the deposited alloy.
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