About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
|
Symposium
|
Powder Metallurgical Components in High Performance Applications
|
Presentation Title |
Development of Resistance Based Sintering for Metal Powders |
Author(s) |
Jerry E. Gould, James Cruz |
On-Site Speaker (Planned) |
Jerry E. Gould |
Abstract Scope |
Resistance based sintering employs axial pressure and in-situ heating to accomplish consolidation. Conventional methods of resistance based sintering (SPS\FAST) have been based paralleling hot isostatic processing (HIPing), using diffusion to accomplish consolidation. The result has resulted in significantly higher productivity compared to HIPing, but still requires processing times on the order of an hour and active gas shielding. In this work, the process has been re-imagined as a complex series of projection welds between contacting particles. The re-imagined technology results in the use of higher currents, dramatically shorter cycle times, and is done without shielding. Initial work has been done with titanium powders. Processing has been developed resulting in full densification in roughly 3 seconds, with contact stresses on the order of 35-MPa. During processing, peak temperatures less than 1000-deg C were experienced. This resulted in a fully β-transformed microstructure with a subsequent Widmenstätten α+β morphology. |