Effect of composition, impurities, and processing on the properties of tungsten heavy alloys

Book · Sat Jun 01 04:00:00 EDT 1996

OSTI ID:237707

Spencer, J R ^[1]

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1. Osram Sylvania Inc., Towanda, PA (United States). Chemical and Metallurgical Div.

Because they are liquid-phase sintered, W-Ni-Fe alloys typically sinter to densities of > 99.5% of theoretical density. At tungsten contents above about 96% W, it becomes more difficult to achieve full density. Utilizing a designed experiment, this study determined the effect of various parameters on the density and sintered, grain size of alloys containing 97.3% tungsten. Parameters included in the study were average tungsten particle size, pressing pressure, solid-state sintering temperature, nickel:iron ratio, and liquid-phase sintering temperature. Also a series of tests were run to determine the sensitivity of tungsten heavy alloys to impurities typically found in tungsten powder or introduced during processing. Copper, sodium, aluminum, chromium, and zinc were added at two levels to the tungsten oxide powder than reduced to the metal powder. Microstructural evaluation and mechanical properties were determined for bars sintered from W-Ni-Fe blends of these powders. The effect of quenching these materials was also investigated.

• OSTI ID: 237707
• Report Number(s): CONF-9510290--; ISBN 1-878954-58-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
BULK DENSITY
CHARPY TEST
CHEMICAL COMPOSITION
CHROMIUM
COPPER
ELONGATION
EXPERIMENTAL DATA
GRAIN SIZE
IMPURITIES
IRON ALLOYS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NICKEL ALLOYS
PARTICLE SIZE
POWDERS
QUENCHING
SINTERING
SODIUM
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TUNGSTEN ALLOYS
ULTIMATE STRENGTH
YIELD STRENGTH
ZINC