TC4钛合金燃烧形貌和机理分析

Combustion Morphology and Mechanism Analysis of Titanium Alloy TC4

采用液滴法引燃TC4钛合金试片,利用扫描电镜及能谱仪观察燃烧产物,并分析其燃烧机理。结果表明:钛合金燃烧需要的外部条件高,采用熔融TA1液滴在富氧条件下剧烈燃烧生成的热量引发TC4试片局部燃烧,燃烧剧烈,燃烧时间持续约10 s,但局部燃烧无法引起基体全面燃烧。TC4钛合金燃烧截面具有燃烧瘤状区、燃烧过渡区及燃烧影响区三个典型结构特征;钛合金剧烈燃烧的主要原因是钛合金燃烧放出大量的热,外层瘤状区疏松多孔且不稳定。

With high specific strength and good erosion resistance, titanium alloy is an indispensable mate?rial for aero-engine. Titanium alloy TC4 was ignited by the liquid droplet TA1, and then the combustion mechanism was investigated through analyzing the combustion products with a scanning electron microsco?py and an energy dispersive spectroscopy. The results indicated that the heat produced by TA1 combustion at the rich oxygen condition ignited the titanium alloy TC4. The TC4 combustion was severe and lasted 10 seconds, but the local combustion could not cause the whole body combustion. The combustion cross-sec?tion had got three typical structural characteristics. The unstable porous top layer with a granular hillock structure was the main reason for the TC4 combustion.