Oxidation Behavior of Porous Ti_2AlC and Ti_3SiC_2 Produced by Powder Metallurgy

摘要

The oxidation resistance of porous Ti_2AlC and Ti_3SiC_2 MAX phase compounds with controlled porosity and grain size obtained by powder metallurgy techniques was studied carrying out oxidation tests at different temperatures for each material depending on their maximum service temperature. The study was performed on isostatic consolidated samples with different percentage (20vol%, 60vol%) and size of space holder (250-400μm, 800-1000μm) and in samples without space holder. In order to understand the oxidation mechanism, oxidation kinetics were analyzed to determine the influence of size and amount of porosity in each case. In addition, the microstructure and composition of the oxide layers formed after the tests were analyzed by scanning electron microscopy (SEM).