Methods for metal flow reactor modules and modules produced

A method for forming a metal flow module, the method comprising:

• stacking together a first metal plate having opposing first and second major surfaces and one or more flow channels defined at least in part in the first major surface, with a second metal plate having opposing first and second major surfaces, the plates stacked together with their respective first major surfaces facing each other and with a layer of flux positioned in between contacting portions of the respective first major surfaces defined as those portions of the respective first and second major surfaces which would be in contact absent the flux;
• heating the plates together with the flux already positioned therebetween in a non-oxidizing atmosphere or an inert atmosphere to thermally bond the contacting portions of the respective first major surfaces of the first and second metal plates,
• wherein the flux comprises a carbide or nitride powder.