[en] The use of refractory materials is of great importance for industries that use high temperature kilns, most of the internal components of the ovens do not support high temperatures and refractory blocks have the function to support, physically and chemically, direct contact with molten materials and also function as a thermal insulator. In this work were prepared 5 different formulations of Aluminum Magnesium Oxide refractory with added graphite. In a first step the characterization of the raw materials through the techniques of Particle Size analysis, X - ray fluorescence and X - ray diffraction, was also developed a method for formulating a binding system. Then the specimens were sintered at 1250 °C in stagnant atmosphere. The proposed refractories were assessed by determining the compressive strength, microstructural characterization by X - ray diffraction and Scanning Electron Microscopy. (author)