FORMATION OF SILICONIZED LAYER ON TiAl-BASED ALLOY AND THE OXIDATION RESISTANCE

作     者：W.Liang X.X.Ma X.G.Zhao J.Zhang D.X.Zou 

作者机构：SchoolofMaterialsScienceandEngineeringTaiyuanUniversityofTechnologyTaiyuan030024China CentralIron＆SteelResearchInstituteBeijing100081China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2003年第16卷第6期

页      面：466-472页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：国家自然科学基金(50171046) 山西省自然科学基金(20021051) 

主　　题：TiAl-based alloy microstructure composite coating high tem-perature oxidation 

摘      要：The Ti-48Al alloy was pack siliconized with 15%Si+85%Al2O3. The microstructure of the siliconized coating on the TiAl-based alloy was analyzed and its effect on oxidation resistance was investigated. The specimens before and after cycle oxidation were examined by XRD and SEM equipped with XEDS. The results showed that the coating is composed of a thin Al2O3 outer layer and a composite inner layer of Ti5Si3 with an appropriate amount of Al2O3 dispersed in. Cycle oxidation tests showed that the high temperature oxidation resistance of TiAl-based alloy was greatly improved by forming such composite coating. No spaliation and crack happened and the weight gain was very small after cycle oxidation at 900℃ for 314h.