Characterization of TiN coating layers using ultrasonic backward radiation.
Since ceramic layers coated on machinery components inevitably experience the changes in their properties it is necessary to evaluate the characteristics of ceramic coating layers nondestructively for the reliable use of coated components and the remaining life prediction. To address such a need, in the present study, the ultrasonic backward radiation technique is applied to examine the very thin TiN ceramic layers coated on AISI 1045 steel or austenitic 304 steel substrate. Specifically, the ultrasonic backward radiation profiles have been measured with variations in specimen preparation conditions such as coating layer thickness and sliding loading. In the experiments performed in the current study, the peak angle and the peak amplitude of ultrasonic backward radiation profile varied sensitively according to two specimen preparation conditions. In fact, this result demonstrates a high possibility of the ultrasonic backward radiation as an effective tool for the nondestructive characterization of the TiN ceramic coating layers even in such a thin regime.
Song
Sung-Jin
SJ
School of Mechanical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea. sjsong@skku.edu <sjsong@skku.edu>
Yang
Dong-Joo
DJ
Kim
Hak-Joon
HJ
Kwon
Sung D
SD
Lee
Young-Ze
YZ
Kim
Ji-Yoon
JY
Choi
Song-Chun
SC