PROCESS FOR PRODUCING AMORPHOUS SPRAYED COATING CONTAINING a-Fe NANOCRYSTALS DISPERSED THEREIN

摘要

The present invention provides a process for producing a sprayed coating which contains α-Fe nanocrystals dispersed therein. This process includes a thermal spraying step for subjecting an alloy powder which consists of an amorphous phase having a nano-hetero structure such that α-Fe nanocrystals having particle diameter of 0.3 nm or more and a mean particle diameter of less than 10 nm are dispersed and which has a first crystallization temperature (Tx1) and a second crystallization temperature (Tx2) and further has an Fe content of 74 at % or more to collision with the surface of a substrate by a thermal spray method using a plasma jet or a combustion flame, and forms an amorphous sprayed coating which contains α-Fe nanocrystals having particle diameters of 0.3 nm or more and a mean particle diameter of 30 nm or less dispersed therein.