INVESTIGATION OF SINTERABLE POWDERS AND BERYLLIUM OXIDE PROPERTIES. Quarterly Report No. 5

Technical Report · Fri Jul 15 04:00:00 EDT 1960

OSTI ID:4126143

Hyde, C; Duckworth, W H

Densities up to 98% theoretical were obtained in MgO ceramics free- sintered at 2400 to 2900 deg F. The most sinterable powder resulted from calcining at 1100 deg F. Various MgO calcines sintered in flowing combustion gases exhibited lower sintered densities in general than did those sintered in still air or flowing hydrogen at 2400, 2750, or 3100 deg F for 1 hr. The sintered density of ceramics made from an MgO calcine increased with faster rates of heating to the sintering temperature. Grain growth apparently was not affected by heating rate in the ranges examined, 50 to 400 deg F per hr. The densities of sintered compacts made from the same calcine increased greatly when the uniaxial compacting pressure was incrased from 10,000 to 20,000 psi or when the isostatic compacting pressure was increased from 20,000 to 40,000 psi. (See also NP-8039.) (C.J.G.)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• NSA Number: NSA-14-025940
• OSTI ID: 4126143
• Report Number(s): NP-8984
• Country of Publication: United States
• Language: English

Related Subjects

AIR
CALCINATION
CERAMICS
COMPACTING
DENSITY
HEATING
HYDROGEN
MAGNESIUM OXIDES
METALS, CERAMICS, AND OTHER MATERIALS
PRESSURE
PYROLYSIS
REPORT
SINTERED MATERIALS
TEMPERATURE