• Title/Summary/Keyword: 비집속법

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A Feasibility Study on the Application of Ultrasonic Method for Surface Crack Detection of SiC/SiC Composite Ceramics (SiC/SiC 복합재료 세라믹스 표면균열 탐지를 위한 초음파법 적용에 관한 기초연구)

  • Nam, Ki-Woo;Lee, Kun-Chan;Kohyama, Akira
    • Journal of the Korean Society for Nondestructive Testing
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    • v.29 no.5
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    • pp.479-484
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    • 2009
  • Nondestructive evaluation(NDE) of ceramic matrix composites is essential for developing reliable ceramics for industrial applications. In the work, C-Scan image analysis has been used to characterize surface crack of SiC ceramics nondestructively. The possibility of detection of surface crack were carried out experimentally by two types of ultrasonic equipment of SDS-win and $\mu$-SDS, and three types of transducer of 25, 50 and 125 MHz. A surface micro-crack of ceramics was not detected by transducer of 25 MHz and 50 MHz. Though the focus method was detected dimly the crack by transducer of 125 MHz, the defocus method could detect the shape of diamond indenter. As a whole, the focus method and the defocus method came to the conclusion that micro crack have a good possibility for detection.