摘要
采用摩擦氧浓度点燃方法,研究YSZ+NiCrAl-B.e复合涂层对TC11钛合金抗点燃性能的影响,并结合摩擦磨损分析和非稳态热传导计算,探讨复合涂层的阻燃机理。结果表明:YSZ+NiCrAl-B.e复合涂层显著提高了钛合金的抗点燃性能,其临界着火氧浓度约为钛合金基体的2.3倍;钛与复合涂层构成摩擦副的摩擦性能高于钛与钛;NiCrAl-B.e层对提高钛合金抗点燃性能的影响不明显。摩擦点燃过程中,YSZ层能够大幅度降低钛合金基体的温度升高,阻隔了热量的快速传输,从而起到延迟点燃钛合金的作用,在这个意义上,该体系涂层中YSZ层是阻燃层,热量阻隔是主要的阻燃机理。
The effect of YSZ+NiCrAl-B.e composite coating on the ignition resistance of TC11 titanium alloy was studied by using the method of friction in oxygen-enriched atmosphere.Combining friction and wear analysis and unsteady heat conduction calculation,the fireproof mechanism of the composite coating was discussed.The results show that the YSZ+NiCrAl-B.e composite coating significantly improves the ignition resistance of the titanium alloy,and its critical ignition oxygen concentration is about2.3 times than that of the bare titanium alloy.The friction property of the friction pair composed of the titanium alloy and the composite coating is higher than that of the friction pair composed of titanium and titanium alloy;And the effect of NiCrAl-B.e layer on the ignition resistance of the titanium alloy is not obvious.In the process of friction ignition,the YSZ layer can significantly reduce the temperature rise of the titanium alloy substrate though preventing the rapid heat transfer,delaying the ignition of the titanium alloy.In this sense,the YSZ layer is the flame retardant layer in the coating system,and heat barrier is the main fireproof mechanism.
作者
弭光宝
欧阳佩旋
李培杰
曹京霞
黄旭
曹春晓
MI Guangbao;OUYANG Peixuan;LI Peijie;CAO Jingxia;HUANG Xu;CAO Chunxiao(Titanium Alloy Research Institute,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Key Laboratoryon Advanced Titanium Alloys of AECC,Beijing 100095,China;National Center of Novel Materials for International Research,Tsinghua University,Beijing 100084,China)
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2019年第5期94-102,共9页
Journal of Aeronautical Materials
基金
国家科技重大专项(2017-VII-0012-0109)
国家自然科学基金(51471155)
关键词
高温钛合金
阻燃涂层
摩擦点燃
抗点燃性能
阻燃机理
钛火
high-temperature titanium alloy
flame retardant coating
friction ignition
ignition resistance
fireproof mechanism
titanium fire
