DESIGN DATA STUDY FOR COATED COLUMBIUM ALLOYS. Bimonthly Report No. 2, May 1, 1963 through July 1, 1963

Technical Report · Thu Aug 01 04:00:00 EDT 1963

OSTI ID:4624871

A series of preliminary evaluation tests was conducted with Pfaudler and TRW protective coatings on 30-mil B-66 and X-110 niobium alloy sheet. Two modified silicide coatings applied by one and two-cycle Pfaudler coating processes and the TRW Cr --Ti --Si coating were comparatively evaluated on the two alloys, prior to initiation of the Design Data Study. Data are presented from one atmosphere cyclic oxidation tests of the six coating-base metal systems at 1800, 2000, 2300, and 2800 deg F. The influence of elevated temperature- reduced pressure exposure on the various coating systems was studied for 1 and 2 hour 2500 deg F exposures at 10/sup -1/ and 1 mm pressures. Postoxidation in air at 2800 deg F was utilized as the criteria Room-temperature bend ductility data are presented for tests on as-coated sheet and on coated sheet after cyclic oxidation for 100 hours at 2000 deg F and 4 hours at 2800 deg F. Smooth and notch tensile data are reported for tests performed on uncoated and coated sheet at room temperature and 1200 deg F. The tensile behavior of coated B-66 and X-110 alloys is discussed relative to that of previously studied FS-85 niobium alloy. (auth)

• Research Organization: TAPCO. Div. of Thompson Ramo Wooldridge Inc., Cleveland
• NSA Number: NSA-17-039525
• OSTI ID: 4624871
• Report Number(s): AD-416459; TM-3770-67
• Country of Publication: United States
• Language: English

Related Subjects

CHROMIUM ALLOYS
COATING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
OXIDATION
PRESSURE
REPORT
SHEETS
SILICIDES
TEMPERATURE
TENSILE PROPERTIES
TESTING
TITANIUM ALLOYS