Sinterability of Tungsten Powder CVD Coated with Nickel and Iron

Abstract

Three lots of tungsten powder coated with nickel and iron by chemical vapor deposition (CVD) were characterized as to its composition, particle size, and distribution. This was accomplished through the use of the scanning electron microscope (SEM) with a digital X-ray dot mapping attachment. DC plasma emission, and Microtrac analysis. The sinterability of the powder was also evaluated through sintering trails of temperatures above and below the liquidus of the matrix phase. It was found that the coating of nickel and iron on the tungsten substrate was very uniform, but it was also difficult to obtain high sintered densities due to the near monosized nature of the powder. The highest sintered density obtained was 90% of the theoretical value. It was concluded that to obtain full density a wider distribution of the particle size would be needed.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1990
Accession Number
ADA231913

Entities

People

  • Robert J. Dowding
  • Sharon Mulligan

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Chemical Analysis
  • Chemical Vapor Deposition
  • Chemistry
  • Coatings
  • Commerce
  • Electron Microscopes
  • Grain Size
  • Information Processing
  • Liquid Phases
  • Materials
  • Materials Engineering
  • Military Research
  • Particle Size
  • Powder Metals
  • Test Methods
  • Vapor Deposition
  • X Rays

Fields of Study

  • Materials science

Readers

  • Aerosol Science/Aerosol Physics
  • Powder metallurgy of Titanium alloys.
  • Surface Engineering/Surface Coating Technology.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene