Abstract
An aerodynamic conical nozzle levitator (CNL) has been used to measure the melting temperatures of refractory ceramics. The well-established method of cooling traces has been adapted to allow measurements for air-sensitive samples using a controlled atmosphere, where the oxygen partial pressure can be adjusted and monitored in real time. In this study, we explain the details of a system that we developed for use at the Spallation Neutron Source (Oak Ridge National Laboratory). Measurements of the melting behavior of (Fe,Cr,Al)3O4 spinels were made between log (PO2 (atm)) of −0.7 and −5. The melting temperature of hercynite is found to be oxygen potential dependent, ranging between 1692 and 1767°C at log (PO2) values from −4.42 to −0.70.
Original language | English |
---|---|
Pages (from-to) | 4867-4875 |
Number of pages | 9 |
Journal | Journal of the American Ceramic Society |
Volume | 103 |
Issue number | 9 |
DOIs | |
State | Published - Sep 1 2020 |
Funding
The authors thank the US DOE Project No: NFE‐18‐07110 funding “Extreme Temperature Sample Environment for Materials Research using Neutron Scattering”. Dissertation project for Can Agca was funded by Oak Ridge National Laboratory through PHD GO! Program and the US Department of Energy Office of Nuclear Energy (DOE‐NE) Advanced Fuels Campaign (AFC). The authors thank Sergey Ushakov (UC Davis), Matthew Tucker, Gary Lynn, Dante Quirinale, Marshall McDonnell, Amy Jones, Greg Rowland and Andrew Nelson (ORNL) for discussions and insights during the design; Mark Loguillo, Matt Rucker, Harley Skorpenske, Carl Lionberger, Douglas Armitage, Xiasong Geng, Rich Crompton and Jesse Clark (ORNL) for their support with the engineering design, with building the levitator, and debugging software and hardware issues. The authors also thank Nick Botto (UC Davis) for his assistance with electron microprobe analysis and Maren Lepple for helping with the translation of papers in German. The authors thank the US DOE Project No: NFE-18-07110 funding ?Extreme Temperature Sample Environment for Materials Research using Neutron Scattering?. Dissertation project for Can Agca was funded by Oak Ridge National Laboratory through PHD GO! Program and the US Department of Energy Office of Nuclear Energy (DOE-NE) Advanced Fuels Campaign (AFC). The authors thank Sergey Ushakov (UC Davis), Matthew Tucker, Gary Lynn, Dante Quirinale, Marshall McDonnell, Amy Jones, Greg Rowland and Andrew Nelson (ORNL) for discussions and insights during the design; Mark Loguillo, Matt Rucker, Harley Skorpenske, Carl Lionberger, Douglas Armitage, Xiasong Geng, Rich Crompton and Jesse Clark (ORNL) for their support with the engineering design, with building the levitator, and debugging software and hardware issues. The authors also thank Nick Botto (UC Davis) for his assistance with electron microprobe analysis and Maren Lepple for helping with the translation of papers in German.
Keywords
- lasers
- oxides
- phase diagrams
- thermodynamics