Modified Mechanical Strength, Thermal Decomposition, and Combustion Characteristics of Nitroguanidine Propellant with Graphene Nanosheets as Reinforcement,Industrial & Engineering Chemistry Research

当前位置： X-MOL 学术 › Ind. Eng. Chem. Res. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Modified Mechanical Strength, Thermal Decomposition, and Combustion Characteristics of Nitroguanidine Propellant with Graphene Nanosheets as Reinforcement
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2024-03-19 , DOI: 10.1021/acs.iecr.3c04467
Ling Chen _{1,

2} , Anning Sun _{1,

2} , Derong Meng _{1,

2} , Binbin Wang _{1,

2} , Feiyun Chen _{1,

2} , Fengqiang Nan _{1,

2} , Ping Du _{1,

2} , Weidong He _{1,

2}

Affiliation

High energy, high strength, and stable combustion character are the basic requirements of a modern gun propellant (GP). Herein, graphene nanosheets (GNSs) are introduced into the nitroguanidine gun propellant (NQ-GP) as reinforcements to modify its comprehensive performance. A series of in-depth characterizations were conducted to characterize the structure and composition of the propellant, demonstrating that GNSs integrated well in the propellant system. The result of mechanical properties manifested that the anti-impact strength increased with the increase in the content of GNSs in the propellant, and GNSs with a low content of 0.5% in the GP exerted better mechanical strength than those with a high content under different temperature conditions; the brickwork bridging effect enhancement mechanism was proposed as well. Besides, the thermal decomposition character was investigated under different heating conditions like programmed and high pressure. It revealed that GNSs with a high content can produce a catalytic effect on the thermal decomposition process of the propellant like the heat release. Additionally, the analysis of the thermal decomposition kinetics of the propellant by the method of Friedman demonstrated that the addition of GNSs with a proper content could further enhance the activation energy of NQ-GP with thermal stability, which is opposite to the result of linear fitting methods of Kissinger and Ozawa. The results obtained by the different methods were likely to vary with the action mechanisms of the different systems or thermal decomposition stages. It also demonstrated that different high-pressure conditions and GNS contents can produce obvious influence on the thermal decomposition behavior of the propellant, such as T_p and heat release. Moreover, it was found that the introduction of GNSs would not influence the burning stability of the propellant and that the burning rate coefficient (a) and the burning pressure exponent (n) could also be modified with the proper content of GNSs. Hence, the work presented herein highly broadens the application scope of the reinforcement nanofiller and will be of potential value to the community development in high-energy and high-strength GPs.

中文翻译：

石墨烯纳米片增强硝基胍推进剂的机械强度、热分解和燃烧特性

高能量、高强度和稳定的燃烧特性是现代火炮发射药（GP）的基本要求。本文将石墨烯纳米片（GNS）作为增强材料引入硝基胍发射药（NQ-GP）中，以改变其综合性能。通过一系列深入的表征来表征推进剂的结构和成分，证明 GNS 可以很好地集成在推进剂系统中。力学性能结果表明，随着推进剂中GNSs含量的增加，抗冲击强度增加，且GP中GNSs含量较低（0.5%）在不同温度下比高含量的GNSs表现出更好的机械强度。状况;还提出了砖砌桥接效应增强机制。此外，还研究了在程序加热和高压等不同加热条件下的热分解特性。研究表明，高含量的GNSs可以对推进剂的热分解过程产生像放热一样的催化作用。此外，通过Friedman方法对推进剂的热分解动力学进行分析表明，适当含量的GNSs的添加可以进一步提高具有热稳定性的NQ-GP的活化能，这与线性拟合的结果相反基辛格和小泽的方法。不同方法获得的结果可能会因不同系统或热分解阶段的作用机制而有所不同。还表明不同的高压条件和GNS含量会对推进剂的热分解行为如T _p和放热产生明显的影响。此外，发现GNSs的引入不会影响推进剂的燃烧稳定性，并且适当的GNSs含量也可以改变燃烧速率系数( a )和燃烧压力指数( n )。因此，本文提出的工作极大地拓宽了增强纳米填料的应用范围，并对高能高强度GPs的社区发展具有潜在价值。

更新日期：2024-03-19

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南