Research about Titanium Alloyed Layer’s Temperature Oxidation Resistance on Aircraft Engine Surface

Abstract

Aircraft engines often work in a high temperature or easily oxidized environment, and the titanium alloy layer on the surface of the existing aircraft engine is poorly resistant to high temperature oxidation. The maximum temperature that can bear currently is slightly above 500°C, which severely limits its widespread application. In order to improve its resistance ability to high temperature oxidation, laser surface alloying technique was adopted here which Ti-Al-xSi alloying layer was prepared on the surface of matrix Ti-6Al-4V alloy (It is mainly composed of Ti-Al Intermetallic Compound and Ti5Si3 Reinforced Phase) and the analysis were presented in three aspects: material phase, tissue observation and high temperature oxidation resistance ability during different time periods. The experimental data of tissue composition, structure and high temperature oxidation resistance of Ti-al-xsi alloying layer which was preset different proportion of Al powder and Si powder mixture were compared. The experimental results showed that, when the mass of Si powder was 10%, 20% and 30% of the Al powder mass, Ti-Al Intermetallic Compound has evolved from TiAl to TiAl2 phase and TiAl3 phase with the increasing additive amount of Si, which had excellent oxidation resistance at high temperature. At the same time, the oxidation weight of alloying layer was decreased and the oxidation rate was declined.