by which the collected heat is directed to an exploiting stage for example including a turbine for producing together with a generator electricity the flowchart shown in fig1 illustrates the manufacturing of a ceramic foam with an opening that is lined and or reinforced by a process as described herein for example the ceramic foam may be the body of a fuel cell from which or to which electrical charges have to be transported and which thus needs to be electrically contacted or a ceramic foam for any other application for example an application discussed hereinbefore the process includes lining reinforcing the initial opening by causing the interpenetration of thermoplastic material for example as shown in fig6 while first constituent that is made of the ceramic foam is still a green body prior to firing sintering the green body for example the green body may directly be shaped molded or similar with the initial opening whereafter the opening is lined and or reinforced because in embodiments of the invention during the liquefaction no pressure is exerted on the object except the small pressure of the liquid that penetrates into the pores the small dimensional stability of the green body is sufficient for this after the step of interpenetrating the green body is fired and or sintered because of this the interpenetrating material of the second constituent has to be chosen to sustain the temperature during this process in the depicted embodiment the second constituent material is chosen to be itself a ceramic material that is thermoplastic before hardening then in the firing sintering process second constituent material is simultaneously sintered to ceramic material also.