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.

主权项

1. A production process of a sprayed coating containing dispersed α-Fe nanocrystals, comprising a thermal spraying step, wherein an amorphous sprayed coating containing dispersed α-Fe nanocrystals of the particle diameter of 0.3 nm or more and the mean particle diameter of 30 nm or less is formed, in a thermal spray method with a plasma jet or combustion flame, by colliding on the substrate surface an alloy powder, with the Fe content of 74 at % or higher, having a structure wherein α-Fe fine crystals with the particle diameter of 0.3 nm or more and the mean particle diameter of less than 10 nm are dispersed in an amorphous mother phase, and having the first crystallization temperature Tx1 and the second crystallization temperature Tx2, and in the thermal spraying step, the amorphous sprayed coating, is formed by the collision of the alloy powder on the substrate surface at in-flight internal temperature of the alloy powder particles of Tx2 or lower and at a flying particle speed of 300 m/s or higher.