HIGH TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM-BASE ALLOYS. Bimonthly Report No. 4, March 13, 1963-May 12, 1963

Technical Report · Sat Jun 01 00:00:00 EDT 1963

OSTI ID:4690466

Kane, L I; Rausch, J J; Holtz, F C

The influence of thermal history for a standardized pack siliconizing process was established for 0.020 to 0.030 inch sheet of the V--60 wt% Nb-1 wt% Ti alloy. Studies of coating thickness as a function of siliconizing time over the temperature range of 2000 to 2200 deg F were made. Coating thickness of 2.25 to 2.75 mils appears to offer optimum oxidation protection based on static air oxidation tests at 2200 deg F; specimens were exposed for more than 500 hours without evidence of failure. Thick coatings, i.e., 4 mils or greater, suffer gross delamination or severe cracking during elastic bending of sheet materials which results in a loss of protective capability. The thicker coatings also appear to behave poorly in high temperature, thermal cycle oxidation tests in an oxygen-hydrogen torch. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. IIT Research Inst.
• NSA Number: NSA-17-030938
• OSTI ID: 4690466
• Report Number(s): NP-12971
• Country of Publication: United States
• Language: English

Related Subjects

AIR
COATING
CRACKS
HIGH TEMPERATURE
HYDROGEN
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
OXIDATION
OXYGEN
REPORT
SHEETS
SILICONES
TEMPERATURE
TESTING
THICKNESS
TITANIUM ALLOYS
TOOLS
VANADIUM ALLOYS
VARIATIONS