POROUS METAL ABRADABLE SEAL MATERIAL

摘要

Porous Metal Abradable Seal Material Porous metal structures are especially useful as abradable seals in axial flow compressors. Carefully defined oxide content and density provide a superior combination of abradability and particulate erosion resistance. The seals are comprised of 1-30 weight percent oxide and have 27-38 percent of the solid metal density. A preferred seal is made by plasma arc spraying a mixture of 80Ni-20Cr and polymethylmethacrylate powders and then heating the resultant deposit in air to about 315.degree.C to cause the polymer to flee. The nichrome seal will have less than 15 percent oxide and a density of about 2.7 g/cm3, about 32 percent of the solid metal density.