Journal ArticleDOI
Analysis of Grain‐Boundary Impurities and Fluoride Additives in Hot‐Pressed Oxides by Auger Electron Spectroscopy
TLDR
In this paper, an Auger electron spectroscopy was used to characterize grain-boundary chemistry in MgO, Al2O3, and MgAl2O4 (spinel) hot-pressed with LiF or NaF.Abstract:
Auger electron spectroscopy was used to characterize grain-boundary chemistry in MgO, Al2O3, and MgAl2O4 (spinel) hot-pressed with LiF or NaF. The presence of additives (F, Na) at the grain boundaries was confirmed; observation of grain-boundary impurities in MgO extends previous studies.read more
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Journal ArticleDOI
Fifty Years of Research and Development Coming to Fruition; Unraveling the Complex Interactions during Processing of Transparent Magnesium Aluminate (MgAl2O4) Spinel
TL;DR: In this paper, the state-of-the-art in transparent polycrystalline spinel fabrication is presented, and the interaction between these key variables during processing is discussed.
Journal ArticleDOI
A Review on the Sintering and Microstructure Development of Transparent Spinel (MgAl2O4)
TL;DR: A review of the densification mechanisms and the microstructural development for transparent spinel made by free sintering and by hot pressing is given in this article, where LiF is shown to have multiple behaviors: it initially wets spinel and forms a liquid phase at relatively low temperatures, which affects early-stage densification and also grain growth.
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Chemical Interaction Between LiF and MgAl2O4 Spinel During Sintering
TL;DR: In this article, LiF and MgAlO 2 O 4 were examined with a variety of tools, including differential scanning calorimetry, thermo-gravimetric analysis, X-ray diffraction and scanning electron microscopy.
Journal ArticleDOI
Sintering kinetics of a MgAl2O4 spinel doped with LiF
TL;DR: In this paper, the sintering kinetics of pure magnesium aluminate spinel, MgAl2O4, and that doped with LiF were determined through the use of the master Sintering curve technique developed by Su and Johnson.
References
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Journal ArticleDOI
Auger electron spectroscopy
TL;DR: Auger Electron Spectroscopy has recently emerged as one of the most sensitive methods of surface analysis and is becoming widely accepted due to the relative simplicity of the LEED-Auger and cylindrical mirror analyzers as mentioned in this paper.
Journal ArticleDOI
Impurity distribution in MgO.
TL;DR: In this article, a microprobe study of impurities in hot-pressed polycrystalline MgO compact and existence of significant grain boundary volume was performed. But the results were limited to a single grain boundary.
Journal ArticleDOI
The densification of MgO in the presence of a liquid phase
TL;DR: The use of LiF allows MgO to be pressed at 47,000 psi less pressure than what is normally used for pure MgOs and it is effective in the removal of surface impurities from the mgO.
Journal ArticleDOI
Hot‐Pressing of MgO with NaF
TL;DR: In this article, the results of using NaF additives in hot-pressing MgO are described and compared with the results when LiF is used, indicating that the formation of a liquid phase, with resultant wetting and lubrication, is important, especially in the early stages of densification.
Journal ArticleDOI
Electron‐Probe Examination of Fracture Surfaces
Roy W. Rice,Robert G. Racus +1 more