TRANSPARENT ALUMINA-BASED PLATE AND METHOD OF MAKING THEREOF

TRANSPARENT ALUMINA-BASED PLATE AND METHOD OF MAKING THEREOF

The present disclosure provides a transparent alumina-based plate, and a hot-pressing method to make the transparent alumina-based plate from platelet alumina. Alumina powder with a platelet morphology was hot-pressed to transparency with pre-load pressures of about 0-8 MPa, maximum temperatures of...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Hauptverfasser: Schlup, Andrew, Costakis, William, Youngblood, Jeffrey Paul, Trice, Rodney Wayne
Format: Patent
Sprache:eng
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
INORGANIC CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG, OR MIXTURESCONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
TRANSPORTING
WORKING CEMENT, CLAY, OR STONE
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Beschreibung
Zusammenfassung:The present disclosure provides a transparent alumina-based plate, and a hot-pressing method to make the transparent alumina-based plate from platelet alumina. Alumina powder with a platelet morphology was hot-pressed to transparency with pre-load pressures of about 0-8 MPa, maximum temperatures of about 1750-1825° C., maximum pressures of about 2.5-80 MPa, and isothermal hold times of 1-7 hours. A novel alumina-based plate has been prepared, wherein the plate has a thickness of 2-5 mm, an in-line transmission of at least 60-75% for a light with a wavelength range of 645-2500 nm, an in-line transmission variance of