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Meeting Materials Science & Technology 2015
Symposium Ceramic Optical Materials
Presentation Title Effects of Varied Heat Treatments on Precipitation of Alumina in Astoichiometric Magnesium Aluminate Spinel
Author(s) J. A. Miller, I. E. Reimanis, W. Miao
On-Site Speaker (Planned) J. A. Miller
Abstract Scope Certain ceramics show potential for use in transparent armor applications because of their unique combination of optical and mechanical properties. In particular, magnesium aluminate spinel exhibits Knoop hardness values of 160 GPa and in-line transmission as high as 85% in the visible through mid-infrared portion of the electromagnetic spectrum. However, the fracture toughness of spinel is only 1.5-1.9 MPa*m<sup>0.5</sup>. The possibility of employing a particulate toughening mechanism while retaining high transparency is examined here by utilizing astoichiometric spinel, MgO•nAl<sub>2</sub>O<sub>3</sub>, where n=1.00 and n=2.00. Specimens were hot pressed to full density and then solutionized under hot isostatic pressing conditions. They were heat treated for various times and temperatures in air and under vacuum to examine precipitation kinetics of Al<sub>2</sub>O<sub>3</sub>, and to evaluate the effects on hardness, fracture toughness, and optical transmission.
Proceedings Inclusion? Planned: MS&T all conference proceedings CD


Cladded Single Crystal Fibers
Creation of New Material Science on Optical Ceramics
Effects of Varied Heat Treatments on Precipitation of Alumina in Astoichiometric Magnesium Aluminate Spinel
Fabrication of Transparent Magnesium Aluminate Spinel Ceramics using Two Kinds of Spinel Powder with Different Particle Sizes
Fundamental Study in the Processing of Transparent Ceramics
Highly Transparent Polycrystalline YAG Ceramics for Optical Applications
Laser Oscillation of Lu-based Oxide Ceramics by Spark Plasma Sintering
Low Absorption Spinel Windows for High Energy Lasers
NMR Spectroscopy of Paramagnetic Doped Ceramics to Determine Site Occupancy and Distribution
Novel Glass and Glass Ceramic Scintillators for Gamma-ray and Neutron Detection
Polycrystalline Transparent Yttrium Aluminum Garnet for Optical Applications
Praseodymium-doped SiAlON Red Phosphors Prepared by Polymer-derived Method
Processes and Characterizations of Ceramic Optical Fibers
Spark Plasma Sintering of Transparent Ceramics and Unusual Grain Growth
Synthesis and Processing of Transparent Ceramic Scintillators for Nuclear Radiation Detection
The Role of Scattering and Absorption on the Optical Properties of Birefringent Polycrystalline Ceramics: Modeling and Experiments
Transparent Ceramic Scintillators
Transparent Magnesium Aluminate Spinel Prepared via Microfluidization and Aqueous Slip-casting
Transparent Spinel by Microwave Sintering

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