INVESTIGATION OF SINTERABLE POWDERS AND BERYLLIUM OXIDE PROPERTIES. Quarterly Report No. 4

Technical Report · Fri Apr 15 04:00:00 EST 1960

OSTI ID:4140079

Johnson, J E; Hyde, C; Duckworth, W H

The scatter tn modulus-of-rupture data of MgO specimens was reduced by surface grinding. An attempt to characterize sinterable MgO powders by differential thermal analysis was unsuccessiul. Experiments are reported in which the relation of calcining conditions with MgO powder sinterability was examined. The most sinterable powder was obtained by calcining MgCO/sub 3/ at 1500 deg F. Using this powder, an experiment was also conducted to evaluate the strength of ceramics sintered with various heating rates to 2750 deg F. The highest density (about 96.8% theoretical) was obtained by heating specimens at 400 deg F per hour. Specimens heated at 100, 250, or 400 deg F per hour had essentially the same modulus of rupture. This may indicate that strength is not sensitive to this variable. Data on newly obtained BeO powder are tabulated. It was observed that these powders are not particularly sinterable. Ceramics were produced with densities of 94 to 95% of theoretical when compacted for 2 hours at 40,000 psi and sintered for 2 hours at 2750 deg F in hydrogen. (For preceding period see NP-8039.) (J.R.D.)

• Research Organization: Battelle Memorial Inst., Columbus, Ohio
• NSA Number: NSA-14-015060
• OSTI ID: 4140079
• Report Number(s): NP-8669
• Country of Publication: United States
• Language: English

Related Subjects

BERYLLIUM OXIDES
CALCINATION
CERAMICS
COMPACTING
DENSITY
EXPANSION
HIGH TEMPERATURE
HYDROGEN
MACHINING
MAGNESIUM CARBONATES
METALS, CERAMICS, AND OTHER MATERIALS
PHASE DIAGRAMS
POWDERS
PYROLYSIS
SINTERING
SURFACES
TABLES
TEMPERATURE
TENSILE PROPERTIES
TESTING
THERMAL ANALYSIS