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DLC & WC/C Coefficients of friction

I am working on a project about how coating materials, especially DLC and WC/C, could reduce the stick-slip (friction induced vibration). My concern is that during my preliminary experiments, I always get the same values of coefficient for DLC and WC/C (0.2-0.3). In the literature, most values of the coefficient of friction of DLC and WC/C are about 0.1-0.2. Is someone could explain to me this contradiction.

Tony Tuzolana Mbumba
University of Ghent - Ghent, Belgium
2004

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