Study on the Visual Detection of Defects at the Carbon Composites/Cu Brazed Interface by Means of Infrared Radiometer

Plasma facing components are one of the important structures in the research and development of fusion devices, such as the International Thermonuclear Experimental Reactor (ITER). In most cases divertor modules must consist of carbon fiber reinforced carbon materials (C/C) brazed on a Cu heat sink so that the armor tiles damaged during plasma disruption may be replaced or repaired. It is very important to inspect the brazed region of the divertor nondestructively after it is repaired. Infrared radiometry is believed to be very effective for this purpose, because recently the infrared radiometer has been used to defect the separation of tiles and some internal flaws in the construction structure. In this study, infrared radiometry was applied to detect the separation of the Cu/Carbon-carbon composite joint of the armor tile. Moreover, the characteristics of radiation temperature were measured for the surface of an armor tile material.