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Gravitational role in liquid phase sintering
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | German, Randall M. Upadhyaya, Anish Iacocca, Ronald G. |
| Copyright Year | 1998 |
| Description | To comprehensively understand the gravitational effects on the evolution of both the microstructure and the macrostructure during liquid phase sintering, W-Ni-Fe alloys with W content varying from 35 to 98 wt.% were sintered in microgravity. Compositions that slump during ground-based sintering also distort when sintered under microgravity. In ground-based sintering, low solid content alloys distort with a typical elephant-foot profile, while in microgravity, the compacts tend to spheroidize. This study shows that microstructural segregation occurs in both ground-based as well as microgravity sintering. In ground-based experiments, because of the density difference between the solid and the liquid phase, the solid content increases from top to the bottom of the sample. In microgravity, the solid content increases from periphery to the center of the samples. This study also shows that the pores during microgravity sintering act as a stable phase and attain anomalous shapes. |
| File Size | 1083375 |
| Page Count | 12 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19990019810 |
| Archival Resource Key | ark:/13960/t9479b63m |
| Language | English |
| Publisher Date | 1998-11-01 |
| Access Restriction | Open |
| Subject Keyword | Materials Processing Compacting Stability Gravitational Effects Sintering Liquid Phases Distortion Porosity Liquid Phase Sintering Shapes Microstructure Microgravity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
