{"title":"Mechanical and combustion properties of fluoroalkylsilane surface-functionalized boron/HTPB composite","authors":"","doi":"10.1016/j.combustflame.2024.113621","DOIUrl":null,"url":null,"abstract":"<div><p>Boron (B) and hydroxyl‑terminated polybutadiene (HTPB) composites have been studied as potential solid fuels for air-breathing propulsion systems. One of the challenges facing the B/HTPB composites is the weak interfacial interaction between B and HTPB, which leads to the agglomeration of B particles within the HTPB matrix and deteriorates the mechanical properties and combustion efficiency. The slow oxidation kinetics of B also limit B/HTPB combustion. Herein, we explored functionalizing the B surface with fluoroalkylsilane (F-B) to improve the interaction between B and HTPB while simultaneously providing fluorine as a more potent oxidizer than air. We found that F-B particles, compared to pristine B particles, have a more uniform particle distribution, aggregate into smaller sizes, interact with HTPB more strongly, and consequently relieve stress softening. The F-B/HTPB composite also burns faster in oxygen with less ejection of B particles due to the supply of fluorine nearby B particles. These findings highlight the effectiveness of using interfacial chemistry to modify the mechanical and combustion properties of solid composite fuels, which can apply to other energetic solid composites.</p></div>","PeriodicalId":280,"journal":{"name":"Combustion and Flame","volume":null,"pages":null},"PeriodicalIF":5.8000,"publicationDate":"2024-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Combustion and Flame","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010218024003304","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENERGY & FUELS","Score":null,"Total":0}
引用次数: 0
Abstract
Boron (B) and hydroxyl‑terminated polybutadiene (HTPB) composites have been studied as potential solid fuels for air-breathing propulsion systems. One of the challenges facing the B/HTPB composites is the weak interfacial interaction between B and HTPB, which leads to the agglomeration of B particles within the HTPB matrix and deteriorates the mechanical properties and combustion efficiency. The slow oxidation kinetics of B also limit B/HTPB combustion. Herein, we explored functionalizing the B surface with fluoroalkylsilane (F-B) to improve the interaction between B and HTPB while simultaneously providing fluorine as a more potent oxidizer than air. We found that F-B particles, compared to pristine B particles, have a more uniform particle distribution, aggregate into smaller sizes, interact with HTPB more strongly, and consequently relieve stress softening. The F-B/HTPB composite also burns faster in oxygen with less ejection of B particles due to the supply of fluorine nearby B particles. These findings highlight the effectiveness of using interfacial chemistry to modify the mechanical and combustion properties of solid composite fuels, which can apply to other energetic solid composites.
硼(B)和羟基封端聚丁二烯(HTPB)复合材料作为喷气推进系统的潜在固体燃料已被研究过。硼/氢化丁二烯复合材料面临的挑战之一是硼和氢化丁二烯之间较弱的界面相互作用,这会导致硼颗粒在氢化丁二烯基质中聚集,并降低机械性能和燃烧效率。B 的缓慢氧化动力学也限制了 B/HTPB 的燃烧。在此,我们探索了用氟烷基硅烷(F-B)对 B 表面进行功能化处理,以改善 B 与 HTPB 之间的相互作用,同时提供比空气更强的氧化剂氟。我们发现,与原始的 B 颗粒相比,F-B 颗粒的分布更均匀,聚集成的颗粒更小,与 HTPB 的相互作用更强,从而缓解了应力软化。F-B/HTPB 复合材料在氧气中的燃烧速度也更快,由于 B 粒子附近有氟的供应,B 粒子的喷出量也更少。这些发现凸显了利用界面化学改变固体复合燃料的机械和燃烧特性的有效性,这也适用于其他高能固体复合材料。
期刊介绍:
The mission of the journal is to publish high quality work from experimental, theoretical, and computational investigations on the fundamentals of combustion phenomena and closely allied matters. While submissions in all pertinent areas are welcomed, past and recent focus of the journal has been on:
Development and validation of reaction kinetics, reduction of reaction mechanisms and modeling of combustion systems, including:
Conventional, alternative and surrogate fuels;
Pollutants;
Particulate and aerosol formation and abatement;
Heterogeneous processes.
Experimental, theoretical, and computational studies of laminar and turbulent combustion phenomena, including:
Premixed and non-premixed flames;
Ignition and extinction phenomena;
Flame propagation;
Flame structure;
Instabilities and swirl;
Flame spread;
Multi-phase reactants.
Advances in diagnostic and computational methods in combustion, including:
Measurement and simulation of scalar and vector properties;
Novel techniques;
State-of-the art applications.
Fundamental investigations of combustion technologies and systems, including:
Internal combustion engines;
Gas turbines;
Small- and large-scale stationary combustion and power generation;
Catalytic combustion;
Combustion synthesis;
Combustion under extreme conditions;
New concepts.