ADHESION OF COMMINUTED BASALT ROCK TO METAL ALLOYS IN ULTRAHIGH VACUUM

THE STRENGTH AND NATURE OF THE FORCES OF ADHESION BETWEEN SOILS OF BASALTIC COMPOSITION AND 304 STAINLESS STEEL AND 2024 T-4 ALUMINUM IN AN ULTRAHIGH VACUUM OF 10/100 TORR WERE INVESTIGATED EXPERIMENTALLY. FOR FINE-GRAINED SOILS, FORCES UP TO 495 DYNES/SQ. CM WERE MEASURED. THESE FORCES ARE CONSISTENT WITH VALUES OF VAN DER WAALS FORCES CALCULATED BY MEANS OF A LIFSHITZ EXPRESSION WHEN THE THICKNESS AND ATTENUATING EFFECT OF THE METALLIC OXIDES ARE TAKEN INTO ACCOUNT. THE POSSIBILITY THAT ELECTROSTATIC AND CHEMICAL BONDS ARE PRESENT COULD NOT BE COMPLETELY ELIMINATED, AND THE LIKELY EXISTENCE OF ELECTROSTATIC BONDS IS DEMONSTRATED IN SOME CASES. THE RESULTS OBTAINED IN THE EXPERIMENT ARE QUALITATIVELY CONSISTENT WITH ADHESION OBSERVED IN SURVEYOR SPACECRAFT OPERATIONS ON THE LUNAR SURFACE. /AUTHOR/

  • Supplemental Notes:
    • Vol 74, No 22, PP 5321-5330, 5 FIG, 3 TAB, 29 REF
  • Authors:
    • Selheimer, H E
    • Johnson, S W
  • Publication Date: 1969-10-15

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Filing Info

  • Accession Number: 00237792
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 9 1970 12:00AM