Coated Tungsten Powders for Advanced Ordnance Applications, Phase 2, SBIR.
Abstract
In this program, Ultramet optimized and characterized a fluidized-bed chemical vapor deposition (CVD) process for depositing nickel and iron onto tungsten particles for potential use as kinetic energy penetrator materials. The process yields a composite powder having the nominal composition W:6%Ni/Fe, in which the Ni:Fe ratio is 7:3. Two relatively narrow tungsten particle size distributions were used: one with a mean size of 12-15 Am, the other with a mean size of 5 um. These particle sizes facilitated fluidized-bed CVD processing, but limited the ability to consolidate the materials by liquid phase sintering (LPS) . Consequently, solid-state consolidation (Ceracon process) was used to fabricate billets from which flexure, tensile, impact, and quarter-scale ballistic specimens could be machined. Initial three-point flexure measurements were very encouraging, with modulus-of-rupture values 30-50% higher than those of commercial (90:10, LPS) material cut into similar bars and tested concurrently, and midspan deflections equal to those of the (usually) more ductile 90:10 material. Tungsten powder, Composites, Chemical vapor deposition (CVD), Microstructure, Powder metallurgy.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1992
- Accession Number
- ADA256346
Entities
People
- Brian E. Williams
- Jacob J. Stiglich Jr.
- Richard B. Kaplan