Ni-718 superalloy foam processed by powder space-holder technique: Microstructural and mechanical characterization

Timac G., Gulsoy H. O.

KOVOVE MATERIALY-METALLIC MATERIALS, vol.55, no.4, pp.273-278, 2017 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 55 Issue: 4
  • Publication Date: 2017
  • Doi Number: 10.4149/km_2017_4_273
  • Page Numbers: pp.273-278


In this work, porous Ni-718 superalloys were produced by use of a water soluble pore forming agent before sintering. Carbamide particles were used as the space-holder material. 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 and then sintered at high vacuum. 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 samples.