合金元素对典型阻燃钛合金燃烧行为的影响  

Effect of Alloying Elements on the Burning Behavior of Burn Resistant Titanium Alloys

作　　者：陈永楠[1] 杨雯清 杨泽慧 张凤英[2] 赵永庆[3] Chen Yongnan;Yang Wenqing;Yang Zehui;Zhang Fengying;Zhao Yongqing(Chang’an University,Xi’an 710064,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]长安大学材料科学与工程学院,陕西西安710064 [2]长安大学,陕西西安710064 [3]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2019年第11期3608-3614,共7页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2016YFB0700301,2016YFB1100103);国家自然科学基金(51471136);陕西省博士后项目(2017BSHYDZZ01);中央高校项目(300102318205,300102318206,300102318209)

摘　　要：阻燃钛合金是飞机发动机核心部件中的重要材料,由于钛合金燃烧过程难以控制,燃烧参数难以获得加大了研究难度。以典型阻燃钛合金Ti40和Ti14为研究对象,利用高速摄影在不同氧分压环境下通过直流点火研究其燃烧行为,探索其燃烧过程中的氧扩散过程,明确合金元素对阻燃行为的影响。研究发现,2种合金燃烧后均形成分层结构,Ti40合金中Cr和V元素向外扩散,和氧反应生成Cr2O3/V2O5,密度高于TiO2的密度,Ti原子很难通过Cr2O3向外扩散与氧反应,提高燃烧表面致密度,抑制氧的扩散;而对于Ti14合金,共析反应生成大量的液相,富Cu相包裹Ti相球化晶粒形成Cu元素富集层,隔离氧并减少钛与氧的接触,从而降低氧向基体的扩散速率,同时Cu相的包裹作用增加氧扩散的距离,氧需要更多的能量扩散与Ti接触并反应,从而抑制了反应的发生。To alleviate"Titanium Fire"produced during high pressure and friction of titanium alloy,Ti-V-Cr series and Ti-Cu-Al series burn resistant titanium alloys have been developed.In this work,through a modified direct current simulation burning tests,the burning characteristics,e.g.,flame height,velocity and burning products were measured to evaluate the burn resistant behavior.The results show the burning behavior and reveal the corresponding burning mechanisms of titanium alloys with different alloying elements.The formation of V2O5 and Cr2O3 oxides during burning of Ti40 alloy enhances the density of oxide layer to block the oxygen diffusion,which leads to excellent burn resistant behavior indicated by the smaller burning velocity and lower flame height.For Ti14 alloys,in comparison,a clear Cu-rich layer is formed at the interface between burning product and heat affected zone,where it consumes oxygen by producing Cu-O compounds,thus reducing the burning reaction with Ti-matrix.This work has established a fundamental understanding of how the alloying elements improve the burning resistance of titanium alloys.

关 键 词：阻燃钛合金 燃烧特征 半固态锻造 阻燃机理 

分 类 号：TG146.23[一般工业技术—材料科学与工程]