An apparatus for manufacturing a powder has: a chamber; a temperature control system for the chamber interior; and a conveyor within the chamber. First, second, and third powder sources supply respective first, second, and third powders along respective first, second, and third powder flowpaths. The second and third flowpaths merge with the first flowpath along the conveyor. The apparatus comprises a vaporizer for vaporizing a solvent to be delivered to the second and third powders along the second and third powder flowpaths.