Correlation between microstructure of tungsten and solid state reaction rate with amorphous carbon film

摘要

The correlation between microstructure of tungsten and rate of carbide formation was investigated at 800 ℃ by examining the reaction between amorphous carbon films and tungsten specimens fabricated under different conditions. The carbide formed was W2C, and no WC was observed. The growth rate of W2C showed no significant dependence on the size and shape of crystal grains. A clear correlation, however, was observed between the hardness of tungsten and the rate of W2C growth, and the reaction rate decreased with hardness.