In terms of this contribution the manufacturing of functional, coarse grained, refractory composites based on pre-synthesized grains are investigated. Core/Shell-Sandwich components based on alumina on the outer side and metal/ceramic composite as a core material are the main focus. With the aid of the coarse grains a shrinkage less than 1% during the sintering process is aimed, so that a micro crack free interface between the core and the cell will be generated. For core/shell-components carbon free, corrosion- and thermal shock-resistant hybrid stoppers for metallurgical application in the steel industry are explored. Flame sprayed coatings improve the oxidation resistance of the metal/ceramic composite core material.