NOVELTY - A dry powder mixture including inorganic particles having melting temperature and binding agent having decomposition temperature is heated and the binding agent is cured, to obtain a solid structure. The solid structure is heated to decompose binding agent, to obtain a non-metallurgically-bonded open cell porous structure. The non-metallurgically-bonded open cell porous structure is heated to temperature lower than the melting temperature which metallurgically bonds the inorganic particles, to obtain solid metallurgically-bonded open cell porous structure.    USE - Manufacture of open cell porous structure used for fabrication device such as working-liquid-phase-change heat transfer device, heat exchanger and fuel cell.    ADVANTAGE - The method efficiently provides open cell porous structure has excellent heat conductivity, electroconductivity and absorptive capacity.    DETAILED DESCRIPTION - A dry flowable powder mixture including inorganic particles having melting temperature and binding agent having a decomposition temperature which is less than the melting temperature is heated to a temperature less than the decomposition temperature and the binding agent is cured, to obtain a solid structure. The powder mixture does not contain foaming agent. The solid structure is heated to decomposition temperature to decompose the binding agent, to obtain a non-metallurgically-bonded open cell porous structure. The non-metallurgically-bonded open cell porous structure is heated to a temperature lower than the melting temperature which metallurgically bonds the inorganic particles, to obtain solid metallurgically-bonded open cell porous structure. The inorganic particles contain ceramic particles, metallic particles, coated particles and transition metal chosen from scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, yttrium, zirconium, niobium, molybdenum, ruthenium, rhodium, palladium, silver, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum and gold. The metallic particles is chosen from copper, nickel, iron, titanium, copper-based alloy particle, nickel-based alloy particle, iron-based alloy particle, titanium-based alloy particle and copper-based alloy particle, preferably copper and copper-based alloy particle. The binding agent is cured with curing agent The binding agent is a thermoset resin and thermoplastic polymer. The mixture further includes brazing agent for metallurgically bonding the inorganic particles. The mixture further comprises a lubricating agent. An INDEPENDENT CLAIM is included for the dry flowable mixture.