Microstructural stability of tungsten coated CFC plates aiming to metal Wall experiments at JT-60SA

Abstract Tungsten “Metal wall” experiments are planned at JT-60SA to contribute to ITER. Because tungsten coated CFC materials are attractive for the “metal wall” experiments, their fabrication techniques need to be developed. Aiming to the application of divertor, a sinter bonding method is being developed to join thick tungsten plates and CFC blocks. Present research reports about the fabrication of W/CFC joints, basic microstructural and mechanical characterizations, and results of preliminary high temperature exposure tests at 1073 K and 1173K for 1000 h in medium vacuum.