PROCESS FOR MANUFACTURING A PART COMPRISING A BLOCK OF DENSE MATERIAL CONSTITUTED OF HARD PARTICLES AND OF BINDER PHASE HAVING A GRADIENT OF PROPERTIES, AND RESULTING PART

摘要

A block of dense material is made up of hard particles, of the same or different nature, dispersed in a binder phase. The material has a solidus temperature Ts above which the binder phase is liquid. There is deposited on at least a portion of the surface of the block of dense material an active coating composed of a material capable of reacting chemically with the dense material when the assembly is heated to beyond a minimum reaction temperature Tr. The block coated with the active coating is subjected to a heat treatment comprising heating, then maintenance for a time tm at a maintenance temperature Tm greater than or equal to the minimum reaction temperature Tr, followed by cooling to ambient temperature.