Ti对Nb基合金高温抗氧化性能的影响  

Effect of titanium on high temperature oxidation resistance of niobium based alloy

作　　者：李宁[1] 姜惠仁[1] 

机构地区：[1]北京航空航天大学材料科学与工程学院,北京100191

出　　处：《北京航空航天大学学报》2010年第5期610-613,共4页Journal of Beijing University of Aeronautics and Astronautics

摘　　要：氧化物的体积与形成该氧化物消耗的金属的体积之比(PBR,Pilliing-Bed-worth Ratio),是判断氧化膜完整性的一个重要判据,是氧化膜内产生生长应力的主要因素之一.基于合金氧化行为建立了一个简化的氧化模型,给出计算合金单一氧化膜PBR的计算式,估算了Nb2O5,Ti2Nb10O29,TiNb2O7,TiO2的PBR.研究表明:在Nb基合金中加入合金化元素Ti,合金的高温抗氧化性能得到改善.实验表明:随着Ti含量的增加,合金氧化膜中氧化产物的种类和含量发生变化,致使氧化膜的PBR发生改变.随着Ti含量的增加,氧化膜的PBR值逐渐减小,致使氧化膜的完整性提高.As a criterion of the integrated oxide on pure metals,pilliing-bedworth ratio（PBR） is one of the main reasons of generating the growth stress in the scale.In order to evaluate the value of PBR for the oxide formed on alloys,a simple model had been established;and the value of Nb2O5,Ti2Nb10O29,TiNb2O7 and TiO2 had been evaluated.The results show tthat high temperature oxidation resistance of the alloy is improved by applying with Ti.Type and content of the oxide,which cause the PBR of the scale alter are changed as the content of Ti increases.It is concluded that the PBR of the scale has been decreased accompanied by increasing of Ti,making the scale not be cracked,which induces the scale and has a better protective effect on the matrix.

关 键 词：体积比 铌基合金 高温抗氧化能力 

分 类 号：TB35[一般工业技术—材料科学与工程]