A metal powder slip composition includes a metal powder, a polycarbonate binder, and a liquid carrier. The slip composition can be debound after slip casting without generating residual carbon. The slip composition can be formed into a porous metal layer on a porous substrate object, the porous metal layer having low residual carbon content, without requiring a step of removing residual carbon. A corresponding method of making a porous metal layer is also provided.
 This invention was made with government support under Contract No. DE-AC05-00OR22725 awarded by the U.S. Department of Energy. The government has certain rights in the invention.