Accession Number:

AD0876986

Title:

Liquid-Like Sintering.

Descriptive Note:

Final rept. 17 Sep 69-17 Sep 70

Corporate Author:

NORTH STAR RESEARCH INST MINNEAPOLIS MN

Personal Author(s):

Report Date:

1970-10-01

Pagination or Media Count:

28.0

Abstract:

A research program was conducted to demonstrate that sintering of powder particles can take place without the need for high pressures or high temperatures. Commercially available powders copper, nickel, and alumina were cleaned in an ultrahigh vacuum system by electron or ion bombardment in argon or hydrogen plasmas Powders were heated by the combardment or by infrared irradiation. Subsequent inspection by electron microscopy reveals neck growth between particles of copper and nickel, indicating mass transfer. The diameters of the necks on individual copper particles cleaned at temperatures slightly above one-fourth of the absolute melting point are always approximately one-half micron. These results indicate that the use of submicron particles would lead to complete sintering. No sintering was observed in the alumina powders. Author

Subject Categories:

  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE