HOT-PRESSING CERAMICS IN ALUMINA DIES

Journal Article · Sun Sep 01 04:00:00 EDT 1963 · American Ceramic Society Bulletin (U.S.)

OSTI ID:4634916

Spriggs, R M; Brissette, L A; Rossetti, M; Vasilos, T

Exploratory experiments showed that it was possible to prepare a wide variety of polycrystalline ceramic oxides of very high density and fine grain size by hot pressing in high density alumina dies. The contaminating and reducing atmosphere of conventional graphite dies was eliminated. Higher pressures and hence lower temperatures were allowed; and the fabrication of otherwise easily reduced oxides was possible. The use of a dial indicator permitied continuous monitoring and measurement of ceramic body compression, sintering and densification effects and stages, and specific control, where desired, of porosity levels. A hot ejectio chamber allowed the molding of materials whose expansions were less than that of the die body. Examples are given of the ceramic oxides successfully fabricated to high density by this technique: the refractory oxides Al/sub 2/O/sub 3/, Cr/sub 2/O/sub 3/, M gO, Y/ sub 2/O/sub 3/; defect oxides such as NiO, ZnO, TiO/sub 2/, Nb/sub 2/O/sub 5/, WO/ sub 3/, and a number of rare earth oxides. (auth)

• Research Organization: Avco Corp., Wilmington, Mass.
• NSA Number: NSA-17-036255
• OSTI ID: 4634916
• Journal Information: American Ceramic Society Bulletin (U.S.), Journal Name: American Ceramic Society Bulletin (U.S.) Vol. Vol: 42; ISSN ACSBA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALUMINUM OXIDES
CASTING
CERAMICS
CHROMIUM OXIDES
COMPACTING
CONTROL
CRYSTALS
DEFECTS
DENSITY
DIES
EXPANSION
FABRICATION
GRAIN SIZE
GRAPHITE
HOT WORKING
MAGNESIUM OXIDES
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MONITORING
NICKEL OXIDES
NIOBIUM OXIDES
POROSITY
PREPARATION
PRESSURE
RARE EARTHS
REDUCTION
REFRACTORIES
SINTERING
TEMPERATURE
TITANIUM OXIDES
TUNGSTEN OXIDES
USES
ZINC OXIDES