Process and apparatus for coating particles with fine powder

Abstract From the Canadian patent

There is disclosed a process for coating particles such as ceramic and metal cores, with fine powder such as, ceramic, metal or carbon powder. The process comprises providing a mixture comprising the particles and a binder which is capable of slowly melting to viscous state. Then the mixture is tumbled while slowly heating it to enable the binder to reach the viscous state while allowing the particles to be substantially covered with the binder. The next step includes cooling the mixture to about room temperature and thereafter breaking up the particles that may have agglomerated during the tumbling and heating to give individual particles covered with the binder. As a final step, the fine …