Ti-V-Cr系阻燃钛合金的非等温氧化行为及阻燃性能预测

doi:10.11868/j.issn.1001-4381.2016.01.001

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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V₂O₅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Cr₂O₃,TiO₂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。

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	隋楠

关键词 ：阻燃钛合金, 非等温氧化, 热重分析, 阻燃性能, 钛火

Abstract：

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 1723K, the non-isothermal oxidation resistance obviously decreases with increasing of vanadium content. Simultaneously, the oxidation film thickness increases from 168μm to 370μm, and the oxidation film thickness of Ti-35V alloys is about 1.45 times that of Ti-25V 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-15Cr decreases about 15.5% than that of Ti-25V-15Cr alloy. The non-isothermal oxidation resistance of Ti-V-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 TiO₂ the 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.

Key words： fireproof titanium alloy non-isothermal oxidation thermogravimetric analysis fireproof property titanium fire

收稿日期: 2015-11-12 出版日期: 2016-01-20

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

通讯作者: 弭光宝 E-mail: miguangbao@163.com

作者简介: 弭光宝(1981-),男,博士,高级工程师,主要从事高温钛合金及阻燃性能评价等方面研究,联系地址:北京市81信箱15分箱(100095), E-mail:miguangbao@163.com

引用本文:

弭光宝, 曹春晓, 黄旭, 曹京霞, 王宝, 隋楠. Ti-V-Cr系阻燃钛合金的非等温氧化行为及阻燃性能预测[J]. 材料工程, 2016, 44(1): 1-10.
Guang-bao MI, Chun-xiao CAO, Xu HUANG, Jing-xia CAO, Bao WANG, Nan SUI. Non-isothermal Oxidation Characteristic and Fireproof Property Prediction of Ti-V-Cr Type Fireproof Titanium Alloy. Journal of Materials Engineering, 2016, 44(1): 1-10.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.01.001 或 http://jme.biam.ac.cn/CN/Y2016/V44/I1/1

Fig.1 Ti-V合金试样的非等温氧化增重曲线

Fig.2 Ti-V合金非等温氧化后试样表面形貌
(a)Ti-20V;(b)Ti-25V;(c)Ti-35V

Fig.3 Ti-V合金氧化后试样表面XRD分析结果

Fig.4 V元素对Ti-V合金氧化膜厚度的影响

Fig.5 Ti-V合金非等温氧化后截面EDS分析结果
(a)Ti-20V；(b)Ti-25V；(c)Ti-30V；(d)Ti-35V；(e)Ti-40V

Fig.6 Ti-25V合金的氧扩散层(A,B,C的氧含量分别为33.43%,30.92% 与8.8%)

Fig.7 Ti-V-Cr合金试样的非等温氧化增重曲线

Fig.8 Ti-V-Cr合金非等温氧化后试样表面形貌
(a)Ti-20V-15Cr;(b)Ti-25V-15Cr;(c)Ti-35V-15Cr

Fig.9 Ti-V-Cr合金非等温氧化后试样表面的XRD分析结果

Fig.10 V元素对Ti-V-Cr合金氧化膜厚度的影响

Fig.11 摩擦点火法Ti-V-Cr合金阻燃性能实验结果 (P_fric为摩擦接触压力；c_O为预混气流氧浓度)

Fig.12 Ti-V-Cr合金非等温氧化后截面EDS分析结果
(a)Ti-20V-15Cr;(b)Ti-25V-15Cr;(c)Ti-30V-15Cr;(d)Ti-35V-15Cr;(e)Ti-40V-15Cr

Fig.13 Ti-25V-15Cr基体/界面中氧扩散层 (A,B的氧含量小于5%)

Table 1 Ti-V-Cr合金高温段的氧化激活能

Fig.14 Ti-35V-15Cr合金磨损产物XRD分析结果

Fig.15 Ti-V-Cr阻燃钛合金650℃的氧化增重曲线

Fig.16 Ti-V-Cr阻燃钛合金抗非等温氧化的微观机制

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