Sinterability of Tungsten Powder CVD Coated with Nickel and Iron
ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB
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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.
- Metallurgy and Metallography