Frictional ignition of Ti40 fireproof titanium alloys for aero-engine in oxygen-containing media  

含氧环境中航空发动机用Ti40阻燃钛合金的摩擦点燃(英文)

作　　者：弭光宝 黄旭[1] 曹京霞[1] 曹春晓[1] 黄秀松[2] 

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 [2]清华大学新材料国际研发中心,北京100084

出　　处：《Transactions of Nonferrous Metals Society of China》2013年第8期2270-2275,共6页中国有色金属学报（英文版）

基　　金：Project(20123021004) supported by the Key Program of the Aeronautical Science Foundation of China;Project(51312030501) supported by the Pre-Research Program of China

摘　　要：The effect of friction pressure p and oxygen concentration xo on the fireproof performance of Ti40 titanium alloy was studied by frictional ignition test, the U--Xo relationship quantitatively describing the fireproof performance of Ti40 was established and the fireproof mechanism of Ti40 was analyzed by SEM, XRD and EDS. The results show that the p--xo relationship of Ti40 obeys parabolic rule. The varying range of xo is about 25% while p varies within 0.1-0.25 MPa. When Xo is 〉70%, Ti40 is ignited immediately at room temperature and develops into continual and steady burning, and the duration of burning is more than 10 s. The fireproof performance of Ti40 is better than TC4 while xo of Ti40 is at least 40% higher than TC4. When Xo is low, the fireproof performance of Ti40 is more sensitive to p; when Xo increases, it is more sensitive to Xo. The forming of fused oxides of V205, TiO2 and Cr203 with strong inner interaction during friction is the basic reason of high fireproof performance of Ti40.采用摩擦点燃的方法,研究摩擦压力p和氧浓度xO对Ti40阻燃钛合金的抗点燃性能的影响,建立了定量描述Ti40钛合金抗点燃性能的p—xO关系曲线,并结合SEM、XRD和EDS等测试手段分析Ti40钛合金的抗点燃机理。结果表明:Ti40钛合金的p—xO关系曲线符合抛物线规律,p在0.1～0.25 MPa变化时,xO的变化范围约为25%。当xO≥70%时,Ti40钛合金在室温条件下即会被点燃,并迅速发展为持续的稳定燃烧,且时间长于10 s。Ti40钛合金的抗点燃性能优于TC4钛合金的,Ti40合金被点燃时所对应的xO至少比TC4高40%。当xO较低时,Ti40钛合金的抗点燃性能对p较为敏感,而随着xO的增大,抗点燃性能对xO更加敏感。摩擦表面形成的具有强相互作用的V2O5、TiO2和Cr2O3氧化物融合物是Ti40钛合金的抗点燃性能提高的根本原因。

关 键 词：Ti40 fireproof titanium alloys fireproof performance fused oxides fireproof mechanism titanium fire 

分 类 号：V252.2[一般工业技术—材料科学与工程]