Influence of 1 and 5 wt% TiC additions on the oxidation behaviour of pure tungsten Articles uri icon

publication date

  • August 2020

start page

  • 1

end page

  • 9

volume

  • 24

International Standard Serial Number (ISSN)

  • 2352-1791

abstract

  • The influence of 1 and 5 wt% of TiC nanoparticles on the oxidation behaviour of reinforced tungsten has been evaluated up to 700 °C in dry air. Isothermal thermogravimetric tests prove that the addition of 5 wt% of TiC particles is detrimental, increasing the mass gain of pure tungsten by a factor of ten. TiC particles act as stress concentrators, facilitating microcracking events within the scale and promoting decohesion between TiC-free boundaries and TiC-containing regions of the material. Compared to pure tungsten, lowering TiC addition to 1 wt% significantly improves the oxidation resistance at 700 °C by reducing about seven times the mass gain, while at 600 °C both materials exhibit similar resistance. At 700 °C, the presence of 1 wt% of TiC particles inhibits massive microcracking events occurring in the scale formed on pure tungsten, rendering the oxide scale denser and more protective.

keywords

  • composites; oxidation resistance; reinforced materials; tic; titanium carbide; tungsten