系阻燃钛合金的非等温氧化行为及阻燃性能预测  

Non-isothermal Oxidation Characteristic and Fireproof Property Prediction of Ti-V-Cr Type Fireproof Titanium Alloy

作　　者：弭光宝[1] 曹春晓[1] 黄旭[1] 曹京霞[1] 王宝[1] 隋楠[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：《材料工程》2016年第1期1-10,共10页Journal of Materials Engineering

基　　金：国家自然科学基金资助项目(51471155);中航工业技术创新基金(2014E62149R)

摘　　要：采用TGA/DSC实验方法,结合XRD,SEM和EDS分析,系统研究Ti-V,Ti-V-Cr合金的非等温氧化行为及氧化产物的微观结构,并探讨V和Cr元素对Ti-V-Cr阻燃钛合金抗非等温氧化性的影响机制。结果表明:从室温至1723K温度区间内,随着V元素含量的增加,Ti-V合金的抗非等温氧化性显著降低,氧化膜厚度从168μm增加至370μm,Ti-35V合金氧化膜厚度约为Ti-25V的1.45倍;Ti-V-Cr合金的抗非等温氧化性逐渐提高且差异较小,氧化膜厚度从110μm减小至85μm,Ti-35V-15Cr合金的氧化膜厚度比Ti-25V-15Cr降低约15.5%。Ti-V-Cr阻燃钛合金的抗非等温氧化性显著高于Ti-V合金,主要因为非等温氧化过程形成的液态相V_2O_5极大地释放了氧化膜的内应力,提高了氧化膜与合金基体的结合性,并与Cr_2O_3,TiO_2共同阻止了O向合金基体的大量扩散。非等温氧化增重曲线及氧化膜厚度作为特征参数定量描述了Ti-V-Cr阻燃钛合金的抗非等温氧化性,与摩擦着火实验结果相一致,从而预测了合金的阻燃性能。The non-isothermal oxidation characteristic and the microstructure of the oxidation products were systematically studied by TGA/DSC test methods associated with XRD,SEM and EDS analysis methods.Further,the influence mechanism of vanadium and chromium elements on the non-isothermal oxidation resistance of Ti-V-Cr type fireproof titanium alloys was discussed.The results show that,from room temperature to 1723 K,the non-isothermal oxidation resistance obviously decreases with increasing of vanadium content.Simultaneously,the oxidation film thickness increases from168μm to 370μm,and the oxidation film thickness of Ti-35 Valloys is about 1.45 times that of Ti-25 V alloys;whereas the non-isothermal oxidation resistance of Ti-V-Cr type fireproof titanium alloys gradually increases with increasing of vanadium content and the differences among these alloys are quite small.The oxidation film thickness changes from 110μm to 85μm,and the thickness of Ti-35V-15 Cr decreases about 15.5%than that of Ti-25V-15 Cr alloy.The non-isothermal oxidation resistance of TiV-Cr alloys is much higher than that of Ti-V alloys,and the main reasons are that the liquid V2O5 formed during non-isothermal oxidation greatly releases the inner stress of oxidation film,which improves the combination ability between oxidation film and alloy matrix and also prevent together with Cr2O3 and TiO2the massive diffusion of oxygen to the alloy matrix.The non-isothermal oxidation resistance characteristic of Ti-V-Cr fireproof titanium alloys is described quantitatively by non-isothermal oxide mass gain curve and oxidation film thickness,which are consistent with the results of friction ignition test.Therefore,the fireproof property of titanium alloy can be predicted.

关 键 词：阻燃钛合金 非等温氧化 热重分析 阻燃性能 钛火 

分 类 号：TG146.23[一般工业技术—材料科学与工程]