High Temperature Oxidation Behavior Of Tial Alloy Micro-arc Oxidation Ceramic

In this article, the effect of electrolyte and electrical parameters on the growing process of the TiAl alloy Micro-arc Oxidation ceramic layer is studied by the MAO equipment designed by ourselves. That oxidation-resistance in high temperature can be promoted and friction coefficient does not changed by Micro-arc Oxidation can be found through high-temperature oxidation and friction and wear experiment. The micro-structure of the ceramic layer is studied by scanning electron microscope(SEM) and X-ray diffraction. The results show that the ceramic layer is formed by minute cone-like grain under the condition of micro-arc discharge. Each grain has a pore in its center. With the thickness increasing, the cone-like grain and the pore of the ceramic layer become large. On the contrary, the compaction of the grain becomes decrease. The combination between ceramic layer and matrix is metallurgical binding. The ceramic layer is mainly composed of AlzTiOs and a bit of Ti02 or Si02...