ALUMINUM DIFFUSION COATING LAYER OF HEAT RESISTING STAINLESS STEEL AND METHOD FOR FORMING THE SAME

摘要

The diffusion coating of Al is applied to a stainless steel workpiece by burying it in a pack containing an Al source, an activator and inert filler materials. The steel and powder is heated at 850-1025 deg.C for 0.5-20 hours. An outer aluminide layer and a chromium rich intermediate layer is formed on the stainless steel without forming an interdiffusion layer containing aluminide precipitates under the aluminide layer. The Al-coated stainless steel is used as high temperature components in the petroleum, chemical and steel industries.