The Use of Dy2O3 as Thermal Barrier in Aluminide Coating on One Type of Stainless Steel

Abstract

The working hard conducts that some material suffer from lead us to protect it from corrosion and give long life. When we select protective system we shall take three points, the work place, base structure and the protective system it self. In this study, we test two types of diffusion coated by cementation (Single Aluminized Coating, Thermal Barrier Coating) at (1000 0 C) with (2,4,6 h). The up take of aluminum and coating thickness obeys the parabola rule so that the coating process obeys diffusion process and the weight gain rate increase with the temperature increased. The other objective of this study was to see the degradation behavior of the systems during thermal cycling (three hour cycles in enhanced hotsalt solution). The single aluminized has good protects while the uncoated sample failed after five cycles. The thermal barrier coating has an excellent protection during the test time because of the good adhesion of Al 2 O 3 layer.