【摘要】 为了提高钛和钛合金表面的抗高温氧化能力,使用先预置一层硅粉后预置一层铝粉方式,采用激光合金化技术在TA2钛表面制备出耐1000℃高温的Ti₅Si₃/Ti₃Al复合涂层,并采用XRD、SEM和等温氧化技术对激光合金化后涂层的组织特征和1000℃、50h空气等温氧化性能进行了系统研究。研究结果表明:涂层主要由初生的Ti₅Si₃相和Ti₅Si₃/Ti₃Al共晶组织组成;复合涂层经过1000℃、50h空气等温氧化后的氧化增重速率约为基体的1/12;复合涂层的氧化产物主要是Ti O₂、Al₂O₃和SiO₂;复合涂层中Ti₅Si₃和Ti₃Al两相的存在是其抗高温氧化性能提高的主要原因。更多还原

【Abstract】 To improve the high temperature oxidation resistance of titanium and titanium alloys,a Ti₅Si₃/Ti₃Al composite coating with oxidation resistance at 1000℃was prepared by laser alloying on TA2 titanium alloy with inner layer of silicon powder and outer layer of aluminum powder.XRD,SEM and isothermal oxidation technology were used to study the microstructure and the air isothermal oxidation performance of the coating at 1000℃for 50h.The results show that the composite coating is mainly composed of primary Ti₅Si₃ phase and Ti₅Si₃/Ti₃Al eutectic structure;the oxidative weight gain rate of the composite coating is about one twelfth of that of the substrate;the oxidation products of the composite coating are mainly TiO₂,Al₂O₃ and SiO₂;the existence of two phases Ti₅Si₃ and Ti₃Al in the composite coating is the main reason for the improvement of its oxidation resistance at 1000℃.更多还原