Preparation and Combustion Performance of a Ti/Fe(NCN) Thermite

doi:10.12382/bgxb.2024.0006

Abstract

Abstract:

As a type of high-energy, insensitive and safe energetic material, the thermites have been applied in solid propellants, metal welding, new material manufacturing and other fields. In recent years, a type of metal carbodiimide M_x(NCN)_y (where M is an alkali metal, alkali earth metal, transition metal or non-metallic element) has gradually become a research hotspot due to its unique electronic structure and novel physicochemical properties. This study utilizes the high nitrogen content and metastable properties of metal carbodiimides, represented by Fe(NCN), to assemble a new type of thermite system with nano Ti-Ti/Fe(NCN). And the composition, structure, morphology, combustion characteristics and reaction process of Ti/Fe(NCN) are explorated. The results show that the combustion process of Ti/Fe(NCN) is outstanding with a heat release of 605J/g and a pressure release of 319kPa, and Fe, TiC_0.2N_0.8 and gas product N₂ are detected in the reaction products when the mass ratio of Ti-Fe(NCN) is 5∶1. The study of new thermite Ti/Fe(NCN) would enrich the research system of energetic materials and provide new ideas for the development of new energetic devices.

Key words: thermite, Ti/Fe(NCN) energetic material, combustion characteristic, heat release, reaction process

CLC Number:

TQ560.5

WAN Lixiang, ZHU Lixiang, LI Xiaopeng, LANG Maoyun, CAI Changwu, YIN Yanjun. Preparation and Combustion Performance of a Ti/Fe(NCN) Thermite[J]. Acta Armamentarii, 2024, 45(12): 4500-4507.

Figures/Tables 8

Table 1 Mass ratio of Ti and Fe (NCN) for experiment

序号	Ti质量/g	Fe(NCN) 质量/g	Fe(NCN) 质量含量/%
1	0.05	0.01	16.7
2	0.05	0.03	37.5
3	0.05	0.05	50.0
4	0.05	0.1	66.7
5	0.05	0.15	75.0

Fig.1 Composition, structure, and morphology characterization of Fe(NCN)

Fig.2 Characterization of components and their morphologies of Ti/Fe (NCN) with different mass ratios

Fig.3 Combustion processes of Ti/Fe(NCN) with different mass ratios

Fig.4 Pressure-time curves of Ti/Fe (NCN) with different mass ratios

Table 2 Maximum pressures and generation times of Ti/Fe (NCN) system under different mass ratios

质量比	压力/kPa	时间/ms
5∶1	319	3.40
5∶3	206	3.38
5∶5	203	3.77
5∶10	123	5.18
5∶15

Fig.5 Heat releases of Ti/Fe(NCN) with mass ratio of 5∶1

Fig.6 Study on the reaction process of Ti/Fe (NCN) at the mass ratio of 5∶1

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