DEVELOPMENT AND EVALUATION OF HIGH-TEMPERATURE TUNGSTEN ALLOYS. Final Report, October 1, 1959-September 30, 1960

Technical Report · Wed Dec 14 04:00:00 EST 1960

OSTI ID:4756915

Holtz, F C; Van Thyne, R J

Ductile high-tungsten alloys, prepared by liquid-phase sintering techniques, were developed for temperatures up to 2000 deg F. Several alloy systems based on W--Ni-Ru with additions of Fe, Mo, or Pt had excellent ductility and useful high-temperature properties; tungsten levels were maintained at 90 wt%, and the ruthenium and platinum additions ranged from 0.5 to 1 wt%. Room- temperature tensile strength values were in the 130,000 to 160,000 psi range with 15 to 25 per cent elongation; ultimate tensile strength values ranged from 34,000 to 41,000 psi at 2000 deg F; and oxidation rates of 0.0015 to 0.034 inch per hour were measured at 2000 deg F. The long-time rupture properties at 2000 deg F were not substantially improved by small alloying additions to the W--Ni--Fe system. Fused coatings of a nickelchromium base alloy, AMS 4775, gave excellent protection to W--Ni-Fe alloys for 500 hours in air at 2000 deg F. Slip casting in plaster molds was used to produce fully dense sintered compacts of 95W--3Ni--2Fe up to 11/4 inches thick. Strong, ductile joints in sintered W--Ni- Fe composites were accomplished using localized induction heating, tungsten-electrode inert-gas welding, and oxyhydrogen torch welding. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• NSA Number: NSA-17-014808
• OSTI ID: 4756915
• Report Number(s): ARF-2158-24; LAR-46
• Country of Publication: United States
• Language: English

Related Subjects

ALLOYS
CALCIUM SULFATES
CASTING
CHROMIUM ALLOYS
COATING
CORROSION PROTECTION
DEFECTS
DENSITY
DUCTILITY
ELECTRODES
FAILURES
HEAT RESISTING METALS
HEATING
HIGH TEMPERATURE
HYDROGEN
INDUCTION
INERT GASES
IRON ALLOYS
JOINTS
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
OXIDATION
OXYGEN
PLASTER OF PARIS
PLATINUM ALLOYS
PREPARATION
QUANTITY RATIO
RUTHENIUM ALLOYS
SINTERED MATERIALS
SINTERING
SLIP
TEMPERATURE
TENSILE PROPERTIES
THICKNESS
TUNGSTEN ALLOYS
WELDING