High-Pressure Assisted Sintering of Ti-20Si-10B and Ti-10Si-5B Powders

Abstract:

This work presents the structural characterization of Ti-10Si-5B and Ti-20Si-10B (at-%) alloys produced by high-pressure assisted sintering. Sintering was performed in air at 1100 and 1200 °C for 60 s using pressure levels of 5 GPa. Structural evaluation of sintered samples was conducted by means of scanning electron microscopy and energy dispersive spectrometry. Samples were successfully consolidated after sintering, which presented theoretical density values higher than 99%. The microstructures of the sintered Ti-10Si-5B and Ti-20Si-10B alloys revealed the presence of the Ti_SS, TiB, TiB₂, Ti₅Si₃, Ti₅Si₄, TiSi, and TiSi₂.phases. A small amount of Ti₆Si₂B was formed after high-pressure assisted sintering of the Ti-20Si-10B alloy (5GPa, 1100°C for 60 s) indicating that equilibrium structures were not achieved during short sintering times. No oxygen and carbon contamination was detected in structures of Ti-Si-B alloys after high-pressure sintering at 1100 and 1200 °C without controlled atmosphere.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 462-467
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.462
• Online since: August 2012
• Authors: Wladimir Leite Pereira, Erika Coaglia Trindade Ramos, Alfeu Saraiva Ramos, Alexandro Nakano Silva, Filipe Tavares Caetano Lima, Marcello Filgueira
• Keywords: Electron Microscope, Powder metallurgy, Sintering, Titanium Alloy

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