摘要
通过摩擦氧浓度方法点燃涂覆NiCrAl/YSZ/NiCrAl-B.e复合涂层的TC11钛合金,采用XRD,SEM,EDS及EPMA等微观表征方法对其燃烧产物进行分析,进而探讨复合涂层对燃烧行为的影响机理。结果表明:燃烧试样的基体从中心孔沿径向往外呈分区组织演变特征,中心孔处的钛合金基体是着火源;当燃烧程度较低时,YSZ中间层对钛合金燃烧行为的影响较小;当剧烈燃烧时,YSZ中间层通过分解反应而在钛合金熔体中大量溶解,为钛合金熔体提供了O和Zr,加速了Ti与O的快速结合,同时ZrTiO_4燃烧产物的阻氧能力比TiO_2差,从而大大促进了钛合金的扩展燃烧。
NiCrAl/YSZ/NiCrAl-B. e composite coating on TC11.titanium alloy was combusted by friction in oxygen-enriched atmosphere. The combustion products were studied by XRD, SEM, EDS and EPMA. The effect of the composite coating on the combustion behavior of TC11.titanium alloy was discussed. The results show that there is regional microstructural evolution along radial direction in the substrate of the combusted specimen. The substrate near the central hole is the ignition source. When the combustion degree is low, the effect of the YSZ intermediate layer on the combustion behavior of titanium alloys can be ignored. However, when the combustion degree is high, the YSZ intermediate layer dissolves greatly in the titanium alloy melt through decomposition reaction, which provides O and Zr for the titanium alloy melt and accelerates the interaction between Ti and O. Furthermore, the ZrTiO 4 combustion product has a worse ability to block oxygen diffusion than TiO2. As a result, NiCrAl/YSZ/NiCrAl-B. e composite coating, especially the YSZ layer, promotes the ext-ended combustion of TC11.titanium alloy.
作者
欧阳佩旋
弭光宝
李培杰
何良菊
曹京霞
黄旭
OUYANG Pei-xuan;MI Guang-bao;LI Pei-jie;HE Liang-ju;CAO Jing-xia;HUANG Xu(National Center of Novel Materials for International Research,Tsinghua University,Beijing100084,China;Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys,AECC Beijing Institute of Aeronautical Materials,Beijing100095,China;Beijing Engineering Research Center of Grapheneand Application,Beijing100095,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2019年第5期43-52,共10页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(51471155)
