Polycrystalline alumina articles and methods of manufacture

Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, polycrystalline alumina articles are formed by providing a powder of substantially alpha phase alumina having a grain size of up to about 1 mum, d...

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Bibliographic Details
Main Authors PASCUCCI MARINA R, PARISH MARK V, RHODES WILLIAM H
Format Patent
LanguageEnglish
Published 06.08.2013
Subjects
ARMOUR
ARMOURED OR ARMED VEHICLES
ARMOURED TURRETS
ARTIFICIAL STONE
BLASTING
CEMENTS
CERAMICS
CHEMISTRY
COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS
CONCRETE
HEATING
LIGHTING
LIME, MAGNESIA
MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
MECHANICAL ENGINEERING
METALLURGY
REFRACTORIES
SLAG
TREATMENT OF NATURAL STONE
WEAPONS
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Summary:Polycrystalline alumina and methods for manufacturing polycrystalline alumina exhibiting improved transmission in the infrared region. In one embodiment, polycrystalline alumina articles are formed by providing a powder of substantially alpha phase alumina having a grain size of up to about 1 mum, dispersing the powder in a liquid to form a slurry comprising powdered solids and liquid, removing excess of the liquid from the slurry to form a body, heating the body to provide a densified body, hot isostatically pressing the densified body under conditions to provide an article having a density of at least about 99.9% of theoretical density, and optionally annealing the article, wherein one or more of the annealing or heating are performed in an inert, dry gas.
Bibliography:Application Number: US20080257510