航空发动机用TC11钛合金抗点燃性能及机理研究  

Ignition Resistance Performance and Its Mechanism of TC11 Titanium Alloy for Aero-Engine

作　　者：弭光宝[1] 曹春晓[1] 黄旭[1] 曹京霞[1] 王宝[1] 

机构地区：[1]北京航空材料研究院先进钛合金航空科技重点实验室,北京100095

出　　处：《航空材料学报》2014年第4期83-91,共9页Journal of Aeronautical Materials

基　　金：航空科学基金资助项目(20123021004)

摘　　要：采用摩擦点燃方法研究摩擦接触压力P和预混气流氧浓度c0对TC11钛合金抗点燃性能的影响,建立定量描述TC11钛合金抗点燃性能的P-c0关系,并结合原位观察、SEM和EDS等手段给出TC11钛合金点燃与抗点燃的微观机理。结果表明,TC11钛合金的P-c0关系曲线符合抛物线规律,P从0.05MPa增至0.25MPa时,点燃对应的c0降低约32.5%;TC11钛合金点燃的c0至少比TC4钛合金高20%,即TC11钛合金的抗点燃性能显著高于TC4钛合金;摩擦过程产生强烈的火花,着火首先发生在具有原生金属表面的微凸体上;点燃过程形成燃烧区、熔凝区、热影响区和过渡区四个具有不同特征的区域;富Al和Mo的钛基固溶体相降低热影响区Ti向熔凝区的扩散速率,限制燃烧区Ti与O的优先反应,并与熔凝区O的大量固溶共同阻止O向热影响区的继续扩散,从而提高微凸体的抗点燃性能。The effect of friction contact pressure P and oxygen concentration c0 of premixed air flow on the ignition resistance of TC11 titanium alloy was studied by frictional ignition test.The relationship P-c0 quantitatively describing the ignition resistance of TC11 was established and the microscopic mechanism of ignition and ignition resistance of TC11 was provided by in-situ observation,SEM and EDS,etc.The results show that the relationship P-c0 of TC11 obeys parabolic rule.When P increases from 0.05MPa to 0.25MPa,the c0required for ignition decreases by about 32.5％.The c0 of TC11 ignition is 20％ higher than that of TC4 at least,i.e.,the ignition resistance performance of TC11 is obviously higher than that of TC4.The violent sparks appeared during friction process,and the origin of ignition was located at the micro-bump which has a fresh surface.During ignition,four distinct zones form,including combustion zone,fusion zone,heat-affected zone and transitional zone.The diffusion rate of Ti from heat-affected zone to fusion zone is lowered by the Ti-based solid solution which is rich in aluminum and molybdenum,and thus the reaction between titanium and oxygen in the combustion zone is restricted.Besides,the solution of a large amount of oxygen in the fusion zone inhibits the diffusion of oxygen to the heat-affected zone.As a result,the ignition resistance of micro-bump is improved.

关 键 词：航空发动机 TC11钛合金 阻燃性能 摩擦点燃 机理 钛火 

分 类 号：TG146.2[一般工业技术—材料科学与工程] V252.2[金属学及工艺—金属材料]