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采用摩擦点燃的方法,研究摩擦压力p和氧浓度xO对Ti40阻燃钛合金的抗点燃性能的影响,建立了定量描述Ti40钛合金抗点燃性能的p—xO关系曲线,并结合SEM、XRD和EDS等测试手段分析Ti40钛合金的抗点燃机理。结果表明:Ti40钛合金的p—xO关系曲线符合抛物线规律,p在0.1～0.25 MPa变化时,xO的变化范围约为25%。当xO≥70%时,Ti40钛合金在室温条件下即会被点燃,并迅速发展为持续的稳定燃烧,且时间长于10 s。Ti40钛合金的抗点燃性能优于TC4钛合金的,Ti40合金被点燃时所对应的xO至少比TC4高40%。当xO较低时,Ti40钛合金的抗点燃性能对p较为敏感,而随着xO的增大,抗点燃性能对xO更加敏感。摩擦表面形成的具有强相互作用的V2O5、TiO2和Cr2O3氧化物融合物是Ti40钛合金的抗点燃性能提高的根本原因。
The influence of frictional pressure p and oxygen concentration xO on the ignition resistance of Ti40 flame-retardant titanium alloy was investigated by frictional ignition. The p-xO curve describing the ignition resistance of Ti40 titanium alloy was quantitatively established. Combined with SEM, XRD and EDS and other test methods to analyze the anti-ignition Ti40 titanium alloy mechanism. The results show that the p-xO curve of Ti40 alloy conforms to the parabolic law, and the variation range of xO is about 25% when p varies from 0.1 MPa to 0.25 MPa. When xO ≥ 70%, Ti40 titanium alloy will be ignited at room temperature, and rapidly developed into sustained and stable combustion, and longer than 10 s. The ignition resistance of Ti40 titanium alloy is superior to that of TC4 titanium alloy, and the xO corresponding to Ti40 alloy when ignited is at least 40% higher than that of TC4. When xO is low, the ignition resistance of Ti40 titanium alloy is more sensitive to p, and with the increase of xO, the ignition resistance is more sensitive to xO. The strong interaction of V2O5, TiO2 and Cr2O3 oxide fusions formed on the friction surface is the fundamental reason for the improvement of the ignition resistance of Ti40 titanium alloy.