Abstract: A method of producing powder formed of composite grains comprising a kernel and one or more surface layers. The inventive method comprises the following steps: mixing the grain kernels with a plasmochemical treatment gas; making said kernel/treatment gas mixture flow through a main plasma reactor; and generating a uniform plasma essentially at atmospheric pressure in a treatment region of the main reactor in order to create a plasmochemical reaction between the treatment gas and the surfaces of the kernels so that surface layers form on said surfaces while the mixture flows through the reactor.

Abstract: The invention relates to a method of producing powder formed of composite grains comprising a kernel and one or more surface layers. The inventive method comprises the following steps: mixing the grain kernels with a plasmochemical treatment gas; making said kernel/treatment gas mixture flow through a main plasma reactor; and generating a uniform plasma essentially at atmospheric pressure in a treatment region of the main reactor in order to create a plasmochemical reaction between the treatment gas and the surfaces of the kernels so that surface layers form on said surfaces while the mixture flows through the reactor.