Accession Number : ADA299199

Title :   Nanostructured Bearing Alloy Studies.

Descriptive Note : Quarterly rept. 1 Sep-30 Dec 94,

Corporate Author : CONNECTICUT UNIV STORRS INST OF MATERIALS SCIENCE

Personal Author(s) : Gonsalves, K.

PDF Url : ADA299199

Report Date : 01 FEB 1995

Pagination or Media Count : 4

Abstract : Earlier results from this program have shown that the commercial practice that were developed to handle reactive powders such as titanium, is not adequate for nano powders. Using such practice, oxygen content up to 12% was observed in consolidated nano steel samples. A series of improvements has been made recently in powder handling and consolidation. A more inert atmosphere in the glove box is achieved by incorporation of a diffusion pump and an argon purifying line. The powder is heat treated in a 4% hydrogen-argon mixture in the vacuum press prior to compaction. These changes and resulting reduction in oxygen content in the powder compact were presented in the Second Quarterly Report (October 1994). An additional improvement was made during this reporting period which involved the construction and use of a hydrogen retort to further reduce the oxygen and carbon content in the nano powder prior to consolidation. Several consolidations were also made to evaluate the effectiveness of this improvement. jg p.2

Descriptors :   *POWDERS, *ALLOYS, *TITANIUM, VACUUM, REACTIVITIES, CARBON, STEEL, HYDROGEN, HEAT TREATMENT, OXYGEN, SAMPLING, DIFFUSION, PUMPS, ARGON, ATMOSPHERES, PRESSING(FORMING), COMPACTING, RARE GASES.

Subject Categories : Properties of Metals and Alloys
      Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE