Fundamental study on in-situ repair technique of armor tiles for fusion experimental reactors

In order to establish in-situ maintenance technique with robotics, rebrazin g tests of C/C- composite armor (MFC-1) tile and Oxygen Free High thermal c onductivity Copper (OFHC) and its strength tests were performed, supposing to repair damaged target plate structure in the divertor components on the operation of fusion experimental reactors. The following conclusions were derived; (1) The brazed specimen of MFC-1/OFHC by one seat of Ag-Ti-Cu braze materia l(thickness : 50 mu m) exhibits very good mechanical performance. Rebrazing technique can be applied to the joint MFC-1/OFHC at least three times. (2) Rebrazing joint shows about 1.5 times higher strength than that of braz ing joint and MFC-1. (3) Rebrazing joint shows the same data scattering of that of brazing joint and MFC-1. (4) In order to perform short time replacement of new armor tile, the dista nce between coil and armor surface was kept within 2 mm to transfer heating power into brazing position with high efficiency.