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In-operando thermophysical properties and kinetics measurements of Al-Zr-C composites

机译：On-Ormando热物理和Al-ZR-C复合材料的动力学测量

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This work investigates the combustion velocity, thermophysical properties, and reaction activation energies of Al-Zr-C nanolayered composite microparticles undergoing gasless high-temperature propagation after preparation via additive manufacturing. High-speed videography and pyrometry of the reaction event were used to analyze two Al-Zr-C samples with varied stoichiometry. Combustion velocity of the Al-Zr-C composites was similar to 0.3-0.5 cm/s and varied inversely with the Al content in the system. The Al-Zr-C composites also exhibited auto-oscillations during the propagation event which were characterized to have temperature fluctuations of similar to 50-100 K with a periodicity of similar to 1 Hz. Temperature data collected via color ratio pyrometry was used to measure the thermal profile in-operando. Temperature maps were used to estimate the thermal diffusivity of the samples to be similar to 2 x10(-6) m(2)/s on the leading edge of the reaction front with a 30x increase in thermal diffusivity on the trailing edge. The activation energy for the Al-Zr-C composites was estimated to be similar to 30-35 kJ/mol under reacting conditions. This work ultimately demonstrates an accessible measurement methodology that could be used to estimate thermophysical changes in materials for generalized modeling purposes and confirms the functionality of the materials to create conductive pathways after reaction. (c) 2020 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：该作品研究了通过添加剂制备在制备后经历无气体高温繁殖的Al-Zr-C纳米组复合微粒的燃烧速度，热物理和反应活化能量。反应事件的高速摄像和热测定方法用于分析具有变化化学计量的两个Al-Zr-C样品。 Al-Zr-C复合材料的燃烧速度与0.3-0.5cm / s相似，并与系统中的Al含量相同。 Al-Zr-C复合材料在传播事件期间也表现出自动振荡，其特征在于具有与50-100k类似的温度波动，其周期性类似于1 Hz。通过颜色比率热测定法收集的温度数据测量逆转型的热曲线。温度图用于估计样品的热扩散率与反应前沿的前缘类似于2×10（ - 6）m（2）/ s，以A>在后缘上的热扩散率增加30倍。估计Al-ZR-C复合材料的活化能量在反应条件下类似于30-35kJ / mol。这项工作最终展示了可访问的测量方法，可用于估计用于广义建模目的的材料的热神科变化，并确认材料在反应后产生导电途径的功能。 （c）2020燃烧研究所。由elsevier Inc.保留所有权利发布。

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