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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 behavior of Ti-V and Ti-V-Cr alloys and the microstructure of the products were studied systematically by TGA / DSC and XRD, SEM and EDS. The effects of V and Cr on Ti-V- Cr flame retardant titanium alloy anti-non-isothermal oxidation mechanism. The results show that the non-isothermal oxidation resistance of Ti-V alloy decreases remarkably with the increase of V content from room temperature to 1723K, the thickness of oxide film increases from 168μm to 370μm, the thickness of Ti-35V alloy oxide film is about Ti-25V 1.45 times; Ti-V-Cr alloy non-isothermal oxidation resistance gradually increased and the difference is small, the oxide film thickness reduced from 110μm to 85μm, Ti-35V-15Cr alloy oxide film thickness than Ti-25V -15Cr decreased by about 15.5%. The non-isothermal oxidation resistance of Ti-V-Cr flame-retardant titanium alloy is significantly higher than that of Ti-V alloy, mainly because the V_2O_5 liquid phase formed by non-isothermal oxidation greatly releases the internal stress of the oxide film and improves the corrosion resistance of the oxide film and the alloy Matrix combination, and with Cr_2O_3, TiO_2 together to prevent a large O diffusion to the alloy matrix. The non-isothermal oxidation weight gain curve and the oxide film thickness as the characteristic parameters quantitatively describe the non-isothermal oxidation resistance of the Ti-V-Cr flame-retardant titanium alloy, which is in good agreement with the experimental results of the frictional ignition, thus predicting the flame retardancy of the alloy.