POROUS MOSI2 MATERIAL BY SELF-PROPAGATING HIGH TEMPERATURE SYNTHESIS AND MANUFACTURING METHOD THEREOF

摘要

PURPOSE: Provided is a fabrication method of porous MoSi2 material with high mechanical durability and controlled pore size distribution by self-propagating high temperature synthesis, and a manufacturing method thereof are provided. CONSTITUTION: The material comprises an uppermost MoSi2 layer formed using coarse Mo powder with an average particle size of 200 m and coarse Si powder with an average particle size of 200 m, a plurality of intermediate MoSi2 layers formed using coarse Mo powder with an average particle size of 200 m and fine Si powder with an average particle size of 1.5 m and a lowermost MoSi2 layer formed using fine Mo powder with an average particle size of 1.5 m and fine Si powder with an average particle size of 1.5 m. The method comprises the steps of (a) mixing Mo powder with Si powder with a stoichiometric mixing ratio of 1:2, wherein Si powder is additionally added to the powder mixture according to stoichiometric ratio by 1 to 20 wt.%, (b) moulding the powder mixture to a predetermined features, (c) pre-heating the features with inert gas ambient at a temperature in the range of 300 to 800 deg.C, and (d) causing self-propagation high temperature synthesis by igniting an upper portion of the preheated feature, thereby producing MoSi2 based porous material, wherein the step (a) includes steps of forming an uppermost layer with coarse Mo powder and coarse Si powder, forming a plurality of intermediate layers with coarse Mo powder and fine Si powder, and forming a lowermost layer with fine Mo powder and fine Si powder.