MEASURING METHOD FOR THICKNESS OF COATING ON NI-BASED OR CO-BASED ALLOY

摘要

PROBLEM TO BE SOLVED: To obtain a measuring method in which the thickness of a coating containing Al and Si on the surface of a nonmagnetic body can be measured by a fluorescent X-ray analyzer by a method wherein the thickness of the coating corresponding to a content is found on the basis of the relationship between a measured content and the thickness of the coating which is found in advance. ;SOLUTION: A turbine rotor blade 1 comprises a coating, containing Al and Si, on a blade base material which is composed of an Ni-based alloy or a Co-based alloy. A sensor 3 which is connected to a fluorescent X-ray analyzer body 2 is brought into contact with the turbine rotor blade 1, and the content of Ni or Co is measured. That is to say, when the surface of the Si coating is irradiated with the radiation of the sensor 3, the characteristic X-rays of every content component in a base material depth of about 30μm are generated. The characteristic X-rays are detected by the sensor 3, and they are converted into the content of every component so as to be displayed. At this time, since a detecting intensity is reduced due to the thickness of the coating containing Al and Si, the thickness of the coating can be found on the basis of the relationship between the content and the thickness of the coating which is found in advance.;COPYRIGHT: (C)1998,JPO