About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Melting Point of Transition Metal Diborides via Conical Nozzle Levitator |
| Author(s) |
Fox Thorpe, Elizabeth Sobalvarro, Jesus Rivera, Scott McCormack |
| On-Site Speaker (Planned) |
Fox Thorpe |
| Abstract Scope |
The environmental conical nozzle levitator system (E-CNL) was used to determine the melting points of transition metal diborides (TiB2, Tm = 3313 ± 33 K ; ZrB2, Tm = 3404 ± 38 K ; HfB2, Tm = 3529 ± 33 K; and TaB2, Tm = 3284 ± 10 K ; note: mean ± 2 standard error). Temperature measurements were conducted utilizing two single-color pyrometers at wavelengths of 0.9 μm and 0.65 μm. This system utilizes aerodynamic levitation and dual laser heating to achieve temperatures approaching 4000 K. The samples were synthesized from commercial powders using ceramic gel-casting to produce high density spherical parts. The obtained measurements were compared to previously reported melting temperature values and were generally found to be in agreement with most of the published values. |