Method of preparing a sintered ceramic

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Preparing ceramic comprises mixing a compound (50-75 mass.%) to form a conductive phase, and one or more several material to form insulating phase comprising silicon nitride and silicon oxynitride modified after heat treatment leading to a sintering of ceramic, in a container having a liquid; carrying out a operation of grinding, drying and sieving the mixture; pressing the mixture; and sintering of the mixture to obtain a ceramic having a porosity of 0-30%, where the sintering is carried out under pressure of 50 bars of non-reactive gas. Independent claims are included for : (1) a sintered ceramics, obtained by the process; and (2) a spark plug having high energy-low voltage, comprising the ceramic between the electrode of the plug.