Improvement of oxidation-resistance by electric-discharge coating of Ni-base superalloy IN738LC

摘要

NiCrAlY coating by the electric-discharge technique using a plasma-spark-sintered NiCrAlY electrode was carried out on the surface of IN738LC specimens. The coated surface did not spall off after the air-exposure at 1173K for 1000 h, while some regions of the non-coated (matrix) surface spalled off after 240 h exposure. No spallation of the coated surface of the specimen crept at 1173K in air was observed even after creep fracture.