DEVELOPMENT AND EVALUATION OF HIGH-TEMPERATURE TUNGSTEN ALLOYS. Quarterly Report No. 1

Technical Report · Thu Jan 15 00:00:00 EST 1959

OSTI ID:4756886

Holtz, F C; Van Thyne, R J

Tungsten-rich alloys for use at temperatures up to 1090 deg C are under development. High-temperature alloys containing at least 90 wt% tungsten were prepared by powder metallurgy techniques. Complete densification was obtained in a 99 wt% W-0.6 wt% Ni-0.4 wt% Fe alloy sintered in hydrogen at 1560 deg C the material was machinable but not cold-workable. Additions of 2.5 wt% minium of Cr, Mo, Ti, and Zr were made to a 90 wt% W-Ni--Fe base. Chromoum and molybdenum increased the roomtemperature strength without undue loss of ductility. Titanium and zirconium additions resulted in the presence of some unreduced oxides in the microstructures. Moderate workability and high room-temperature strength was found in a 90 wt% W-5wt% Ni-5wt% Cr composition. Elevated temperature testing of these materials is in progress. Processing techniques including hot-pressing and also sintering of uncompacted powders are under study to determine the feasibility of producing large parts of complex shapes. Protection from oxidation has been achieved by coatings which include a commercial nickelchromium- base alloy and electrodeposited chromium; a weight gain of 0.07 mg/cm/sup 2//hr was reported for a duplex coated specimen after 100 hours in air at 1090 deg C. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• DOE Contract Number: AT(33-3)-4
• NSA Number: NSA-17-014825
• OSTI ID: 4756886
• Report Number(s): LAR-12; ARF-2158-3
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: United States
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
AIR
ALLOYS
CHROMIUM ALLOYS
COATING
COLD WORKING
COMPACTING
CORROSION PROTECTION
DENSITY
DUCTILITY
ELECTRODEPOSITION
HEAT RESISTING METALS
HIGH TEMPERATURE
HOT WORKING
HYDROGEN
IRON ALLOYS
MATERIALS TESTING
NICKEL ALLOYS
OXIDATION
OXIDES
PLANNING
POWDER METALLURGY
PREPARATION
SINTERING
TEMPERATURE
TENSILE PROPERTIES
TITANIUM ALLOYS
TUNGSTEN ALLOYS
WEIGHT
ZIRCONIUM ALLOYS