模拟环境下TB12阻燃钛合金燃烧特征与应用设计

Combustion Characteristics and Application Design of TB12 Burn Resistant Titanium Alloy inSimulated Environment

采用摩擦试验方法在模拟航空发动机压气机环境下对TB12阻燃钛合金的起燃和扩散燃烧等特性进行了研究。结果表明,TB12阻燃钛合金在摩擦生热作用下会发生燃烧,表现为转静子试验件初始碰磨会引发突然燃烧,局部燃烧烧损使得试验件的高度尺寸减小,但其对扩散燃烧不敏感,燃烧快速停止,未发生类似与TC4钛合金的持续扩散燃烧现象。TB12阻燃钛合金燃烧产物具有较强的黏附性能、较高的强度、润滑功能和导热系数低的特点,黏附在试验件表面可降低摩擦生热量,阻止摩擦热向基体传导,减少了转静子试验件再次引发燃烧的可能性。根据TB12阻燃钛合金燃烧特点,在航空发动机中设计应用于压气机静子叶片,初始碰磨引发TB12阻燃钛合金叶片局部烧损后快速停止,形成的燃烧产物将阻止静子叶片与转子鼓筒直接碰磨,可降低因鼓筒失稳鼓包以及鼓包与悬臂静子叶片碰磨导致航空发动机钛火这一故障风险。

The ignition and diffusion combustion of TB12 flame-retardant titanium alloy were studied by friction test under simulated environment of aircraft engine compressor.The results showed that TB12 alloy could be burning under friction heat.The rotor and stator test piece could be ignited at the very beginning of friction,resulting in the size reduction of the test piece.However,because of the insensitivity to diffusion combustion of TB12 alloy,the combustion stop quickly,which is different from TC4 titanium alloy continuous diffusion combustion.The combustion products of TB12 alloy were possessed of good properties of strong adhesion,high strength,lubricating function and low thermal conductivity,thus making them adhesive to the surfaces of the test pieces,which reduced the friction heat and prevented the friction heat transition from surface to the matrix.According to the combustion characteristics of TB12 alloy,it can be designed for compressor stator blades.The TB12 blade could stop burning after initial combustion,and the combustion products will prevent friction between stator blades and rotor drum afterwards.The design and application of TB12 alloy in stator blades can reduce the risk of titanium fire failure caused by drum instability and friction between drum and stator blades.