Measurement of Ti–6Al–4V alloy ignition temperature by reflectivity detection

Abstract

Fires resulting from titanium combustion are complex and violent processes which can instantly burn a titanium alloy once ignited. The occurrence of titanium combustion is a disaster for aircraft. Accurate measurement of the ignition temperature of titanium alloys is of significance in preventing such fires and in investigating combustion-resistance properties. In this study, monochromatic temperature and emissivity measurement methods based on reflectivity detection were used to determine the ignition temperature of a titanium alloy. Experiments were carried out using a titanium burning apparatus. The temperatures of titanium in the oxidation stage before ignition and in the combustion stage during the ignition process were measured using wavelengths of 1050 nm and 940 nm, respectively. Experimental results showed that the ignition temperature of the titanium alloy could be measured by reflectivity detection and that measurement precision during thermal oxidation (500-900 °C) was ±1 °C. The temperature of the ignition process ranged between 1653 and 1857 °C, and the ignition temperature was around 1680 °C.

МЕХАНИЧЕСКИЕ СВОЙСТВА КОМПОЗИТА ВТ6/Сu, ПОЛУЧЕННОГО ФРИКЦИОННОЙ ПЕРЕМЕШИВАЮЩЕЙ ОБРАБОТКОЙ

“…Титановые сплавы, известные хорошим сочетанием механических и коррозионных характеристик, широко используются во многих аэрокосмических, химических и биомедицинских приложениях. Однако титановые сплавы могут быть склонны к окислению и даже самовоспламенению [1] либо в кислороде под давлением, либо при высоких температурах [2], и эти ограничения являются аргументами против их использования, например, в аэрокосмических или автомобильных двигателях. Например, достижение высокотемпературной прочности и стойкости к окислению титановых сплавов путем изготовления литых и горячекатаных листов из сплавов Ti-Cu и Ti-Cu-Nb позволило использовать их для изготовления компонентов выхлопной системы мотоциклов и автомобилей [3].…”

In Situ Intermetallics-Reinforced Composite Prepared Using Multi-Pass Friction Stir Processing of Copper Powder on a Ti6Al4V Alloy

“…Being known for their good combination of mechanical and corrosion-resistant characteristics, titanium alloys are widely used in many aerospace, chemical, and biomedical applications. However, titanium alloys may be prone to oxidizing and even self-ignition [ 1 ], either in oxygen under pressure or at high temperatures [ 2 ], and these limitations are arguments against using them, for example, in aerospace or automotive engines. For example, achieving high-temperature strength and oxidation resistance of titanium alloys by means of fabricating as-cast and hot-rolled Ti-Cu and Ti-Cu-Nb alloy sheets allowed for using them for fabricating motorbike and automotive exhaust system components [ 3 ].…”