  We perform a calculation of the full momentum dependence of the gluon and
ghost propagators in pure SU(3) Yang-Mills theory by integrating Wilson's exact
renormalization group equations with respect to an infrared cutoff k. The heavy
quark potential in the quenched approximation can be expressed in terms of
these propagators. Our results strongly indicate a 1/p^4 behaviour of the heavy
quark potential for $p^2 \to 0$. We show in general, that effective actions
which satisfy Schwinger-Dyson equations, correspond to (quasi-) fixed points of
Wilson's exact renormalization group equations.
