Accession Number:

ADA048191

Title:

Nondestructible MESG Program.

Descriptive Note:

Final rept. Jul 74-Jun 77,

Corporate Author:

CHARLES STARK DRAPER LAB INC CAMBRIDGE MASS

Personal Author(s):

Report Date:

1977-08-01

Pagination or Media Count:

69.0

Abstract:

A program was carried out to develop suitable surface hard-coatings to render MESG bearing hardware indestructible. A test program to determine friction and wear characteristics of carbide-type materials in the MESG environments was carried out and a carboloy-type coating of WCCo was selected for the final cavity surface and a thin film of molybdenum sulfide was selected for the rotor surface. Tests were also carried out to determine other coating properties such as magnetic susceptibility, electrical resistivity and adhesion. Suitable coating procedures based on vacuum deposition techniques such as sputtering and electron beam evaporation were also developed and successfully used to coat both specimens for tests and final MESG cavity and rotor parts. A total of eight MESG rotors were successfully coated with molybdenum disulfide approximately 0.20 microns thick and six sets of cavity parts were coated with an intermediate layer of Inconel by substrate biased high-tate-electron beam evaporation Ion-plated and a final layer of WCCo by hollow cathode-type planar magnetron sputtering. These parts were then delivered to the Autonetics division of Rockwell International Corporation for testing. Author

Subject Categories:

  • Metallurgy and Metallography
  • Fabrication Metallurgy
  • Machinery and Tools
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE