Accession Number:

ADA058009

Title:

Development of a Table top Model for the Generation of Amorphous/ Microcrystalline Metal Powders

Descriptive Note:

Interim technical rept. 1 May 1977-30 Apr 1978

Corporate Author:

PHRASOR TECHNOLOGY DURATE CA

Report Date:

1978-06-01

Pagination or Media Count:

72.0

Abstract:

The electrohydrodynamic EHD technique for the generation of liquid droplets was employed to produce micron size metal powders. This was accomplished using a laboratory feasibility model apparatus which was developed on the program. The aim of the program is the development of a table top powder generator capable of controlled production of ultrafine powders at high cooling rates. The table top generator is to be used in the fundamental studies of the effect of solidification variables on microstructures and the development of new alloy compositions. New ceramic EHD sources were developed capable of operating up to 1400 C with promise of little or no corrosion. Particles below 0.1 to 100 micron were generated with cooling rates extending up to 1,000,000 Ksecond. Coatings a few microns thick were made on metal substrates with no layering effects observed in the coatings. In addition, evidence of welding between a splat foil and the metal substrate was seen. Analytical studies indicate that equations defining the cooling of submicron particles can not be obtained from simple extrapolation of macroscopic heat transfer theory.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE