Features of Initiation and Combustion of Hf/PTFE Reactive Materials

IF 0.5 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Self-Propagating High-Temperature Synthesis Pub Date : 2023-09-05 DOI:10.3103/S1061386223030081

I. V. Saikov, S. A. Seropyan, G. R. Saikova, A. Yu. Malakhov

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Abstract

The optimum composition of components in the Hf/PTFE system was determined by thermodynamic calculation. The composition 65Hf/35PTFE (in wt %) was chosen based on the maximum adiabatic combustion temperature (T_ad = 2381°C) and the fraction of condensed products (70 wt %). The study on the ignition of compositions in argon, air, and vacuum showed that in the latter case, the intensity of ignition decreases. The maximum combustion temperature and rate in argon were found to be 2250°C and 4.5 mm/s for compositions with 10 and 15 wt % Al. XRD analysis revealed the formation of a monophase HfC product in all compositions. Shock-wave loading of compositions with a steel plate at an impact velocity of 1 km/s showed the absence of exothermic reaction in the 65Hf/35PTFE composition. Increasing the impact velocity to 1.5 km/s resulted in an exothermic reaction in this composition. The maximum yield of HfC under shock-wave loading was achieved in the composition 62Hf/33PTFE/5Al, indicating its high reactivity. Thus, this composition is the most optimal for use as a reactive material.

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Hf/PTFE反应材料的起燃特性

通过热力学计算确定了Hf/PTFE体系中各组分的最佳组成。根据最高绝热燃烧温度(Tad = 2381℃)和缩合产物分数(70 wt %)选择了65Hf/35PTFE (wt %)组成。对化学成分在氩气、空气和真空中着火的研究表明，在真空中，着火强度降低。Al质量分数为10%和15%时，在氩气中的最高燃烧温度为2250℃，燃烧速率为4.5 mm/s。XRD分析表明，所有成分均形成了单相HfC产物。在冲击速度为1 km/s时，用钢板对组合物进行冲击波加载，结果表明65Hf/35PTFE组合物没有发生放热反应。将撞击速度提高到1.5 km/s会导致该成分发生放热反应。62Hf/33PTFE/5Al组合物在激波载荷下的HfC产率最高，表明其具有较高的反应活性。因此，该组合物最适合用作反应材料。

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来源期刊

International Journal of Self-Propagating High-Temperature Synthesis MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

1.00

自引率

33.30%

发文量

期刊介绍： International Journal of Self-Propagating High-Temperature Synthesis is an international journal covering a wide range of topics concerned with self-propagating high-temperature synthesis (SHS), the process for the production of advanced materials based on solid-state combustion utilizing internally generated chemical energy. Subjects range from the fundamentals of SHS processes, chemistry and technology of SHS products and advanced materials to problems concerned with related fields, such as the kinetics and thermodynamics of high-temperature chemical reactions, combustion theory, macroscopic kinetics of nonisothermic processes, etc. The journal is intended to provide a wide-ranging exchange of research results and a better understanding of developmental and innovative trends in SHS science and applications.