Ni-90 superalloy foam processed by space-holder technique: microstructural and mechanical characterization

  • Hamit Ozkan GULSOY Marmara University, Technology Faculty, Metallurgy and Materials Eng. Dep., 34722 Istanbul, Turkey
  • Gokhan Timac Yalova University, Vocational School of Altınova, Machine and Metal Tech. Dep, 77100 Yalova, Turkey
Keywords: Superalloy, Foam Material, Powder Processing, Space-Holder Tech


In this study, spherical and between 1400 to 1800 μm carbamide particles coated with Ni-90 superalloys powder were used to produce foam by space-holder technique. Foams with porosity between 60%, 70% and 80 vol.% after mixing and compaction the space-holder particles were extracted using hot water leaching over a range of temperatures. The porous green parts were thermally debound to remove the paraffin wax under a pure argon atmosphere then sintered at high vacuum and subsequently heat treatment were performed. The effects of the volume fraction of space-holder particles on density and porosity were investigated. Microstructures were captured using optical and scanning electron microscopy. Also, compression tests were conducted on the sintered, heat treated samples.