建立定量描述阻燃钛合金抗点燃性能的摩擦接触压力P与预混气流氧浓度c0关系,对比研究Ti-V-Cr系阻燃钛合金及常规钛合金的抗点燃性能,并基于摩擦生热原理和着火热爆燃理论对阻燃钛合金的抗点燃机理进行模型计算分析.结果表明,当c0≥70％时,Ti40钛合金在室温下即会点燃.Ti40钛合金的抗点燃性能比Alloy C+钛合金低2.5％,比TC4钛合金高40％.阻燃钛合金的着火源为摩擦过程产生的微凸体,氧的化学吸附是氧与微凸体相互作用的控制步骤,阻燃钛合金的摩擦点燃临界温度Y*随等效压力Peq的增大而减小.对于Ti40钛合金,当Peq在0.1～0.5 MPa变化时,T*的变化范围为1073～1323K;摩擦表面由TiO2,V2O5和Cr2O3等氧化物融合物构成,厚度为2～5 μm.摩擦过程中该层融合物改善了接触表面的润滑条件,使摩擦区的温度大幅度降低,从而提高了阻燃钛合金的抗点燃性能.
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