Masahiro Fukumoto1, Hiroaki Murakami1,Isao Okane1 and Hiroshi Harada2
1Department of Production Systems Engineering, Toyohashi University of Technology, Toyohashi
The ring shear test was modified to evaluate the adhesion properties of plasma sprayed coatings. To ensure the ring shear test to be reliable, the conditions of some main factors, such as coating thickness, coating width and rod-jig clearance, for the evaluation of the adhesion strength were evaluated.
The results obtained in this research are summarized as follows:
1) In order to develop the accuracy of the loading exactly along the specimen's axial direction, the loading stress uniformity on the coating and the uniformity of the clearance between rod and jig, the conventional ring shear test was modified in shapes of both the shearing jig and the specimen and the loading manner. Consequently, the reproducible results with less scattering were obtained by using the modified ring shear test.
2) To ensure this modified ring shear test as the method to evaluate the adhesion strength of plasma sprayed coating, the necessary conditions of some main factors were evaluated. It was found that coating width, coating thickness and rod-jig clearance should be fixed to some moderate values.
(Received March 4, 1994)
thermal sprayed coating, adhesion strength, ring shear test, coating thickness and width, rod-jig clearance
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