LIGHT-TRANSMITTING CERAMIC, LUMINOUS TUBE COMPRISING LIGHT-TRANSMITTING CERAMIC AND PRODUCTION OF LIGHT-TRANSMITTING CERAMIC

PROBLEM TO BE SOLVED: To obtain a light-transmitting ceramic having a high transparent property and high strength and useful for high brightness discharge lamps by adding a specific amount of a metal oxide having a larger negative value than the standard production Gibbs' energy of Al2 O3 to a...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	NOZAWA TOSHITERU, NARITA SUSUMU, YANAGIYA TAKAKIMI, YAGI HIDEKI
Format:	Patent
Sprache:	eng
Schlagworte:	ARTIFICIAL STONE BASIC ELECTRIC ELEMENTS CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY LIME, MAGNESIA METALLURGY REFRACTORIES SLAG TREATMENT OF NATURAL STONE
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a light-transmitting ceramic having a high transparent property and high strength and useful for high brightness discharge lamps by adding a specific amount of a metal oxide having a larger negative value than the standard production Gibbs' energy of Al2 O3 to a YAG type light-transmitting ceramic. SOLUTION: This light-transmitting ceramic is produced by adding 5-20000ppm (preferably 50-2000ppm) of a metal oxide having a larger negative value than the standard compound Gibbs' energy of Al2 O3 to a light-transmitting garnet crystal structure ceramic consisting mainly of Al2 O3 and Y2 O3 . The metal oxide is especially preferably Sc2 O3 . The raw materials Al2 O3 and Y2 O3 are mixed with the metal oxide, molded e.g. by a press molding method, calcined and subsequently sintered at 1500-1850 deg.C (which is lower by