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  • MATERIALS, METALLIC  (3)
  • 1
    facet.materialart.
    Unknown
    Techniques for lithium removal from 1040 C aged tantalum alloy, T-111 (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The liquid ammonia and vacuum distillation techniques were found to be satisfactory for removing lithium from 1040 C aged T-111 (tantalum - 8-percent tungsten- 2-percent hafnium). Results of ductility tests and chemical analysis show that these two methods are adequate for removing lithium without embrittlement or contamination of the T-111. Moist air exposure of T-111 with traces of lithium on the surface produced mixed results. Some specimens were ductile; others were brittle. Brittle T-111 had an increased hydrogen content. Water removal of lithium from T-111 caused brittleness and an increased hydrogen concentration.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TM-X-2775 , E-7294
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Effects of low-pressure air on oxygen contamination and lithium corrosion of a tantalum alloy, T-111, at 980 and 1260 C (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects were studied of low-pressure air on contamination and corrosion in the tantalum alloy T-111/lithium system at 980 and 1260 C. Capsules of T-111 containing lithium were exposed to six vacuum levels between 1 x 10 to the 8th power and 0.0003 torr by controlled air leakage into a vacuum system. Capsules exposed at 980 C and 0.0002 torr failed from intragranular oxidation. The remainder of the capsules completed the 96-hour tests. The depth of oxygen contamination was greater at 980 C than at 1260 C. Tests made at 0.0001 and 0.00001 torr levels caused large increases in the oxygen content of the T-111. Tests at 0.000001 torr or less produced no significant contamination. No lithium corrosion of the T-111 was observed under any of the conditions.
    Keywords: MATERIALS, METALLIC
    Type: NASA-TN-D-7588 , E-7640
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Technique for recovery of alkali-metal reaction products (1968)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Recovery of potassium tantalate and potassium monoxide to demonstrate procedure for isolation and recovery of alkali-metal reaction products in uncontaminated state
    Keywords: MATERIALS, METALLIC
    Type: NASA-TN-D-4310
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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