Scientific Reports
·
2024
·Vol. 14
·期 1
·1-16
·
IF 3.8
Lu Jiaxin,Chen Chong,Zhang Bobo,Niu Kang,Xiao Fei,Liang Taixin
Boric acid and other impurities on the surface of boron (B) particles can interact with hydroxyl-terminated polybutadiene (HTPB), weakening the mechanical properties and energy release efficiency of boron-based solid rocket propellants. SA@B composite particles were created by coating stearic acid (SA) on the surface of B particles through solvent evaporation-induced self-assembly. The study investigated the impact of SA coating on the combustion performance of B particles and the mechanical properties of HTPB matrix composites. The results showed that the SA coating enhanced the oxidation efficiency of B particles in air. The combustion heat of SA@B composite particles is 30.29 MJ/g, about 50% higher than that of B particles. During the combustion of SA@B composite particles, fewer molten solid particles surround the flame, which enhances the stability of the combustion process of the B particles. Furthermore, the SA coating effectively enhanced the dispersion of B particles in HTPB. At a stretching speed of 100 mm/min, the tensile strength of the SA@B/HTPB composite materials is higher than that of the B/HTPB composite materials. Moreover, when the mass loading of the SA@B composite particles reaches 50 wt%, the tensile strength of SA@B/HTPB composite materials is 2.46 MPa. Activating the surface of boron particles with SA can significantly improve their compatibility with HTPB, which is crucial for the stable storage of boron-based solid rocket propellants.
研究领域:
材料科学
·
燃烧学
·
推进剂工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FUEL
·
2024
·
IF 6.7
Jiuyu Chen,Zhoujie Zuo,Hailong Zhou,Baozhong Zhu,Yunlan Sun
Boron (B) has a good practical application prospect in energetic materials due to its high volumetric and gravimetric heating values. However, the challenge of incomplete combustion inhibited its further application because of the existence of surface boron oxides. Herein, polyethylene glycol (PEG), a kind of oxygen-containing organic matter with an average molecular weight of 2000, was used to modify the B particles at a micron level to improve the combustion performance. The effect of PEG contents on the thermal behavior, heat of combustion, ignition and combustion performance, as well as the combustion intensity of boron powder, was studied. The results showed that the appropriate amount of PEG modification could reduce the ignition temperature of boron powder, increase the degree of oxidation, improve the combustion intensity and heat release. Additionally, the agglomeration behavior of B particles could be alleviated but the improvement diminished with the increase of PEG contents. These results revealed that PEG modification was an efficient strategy to facilitate boron ignition and combustion.
研究领域:
材料科学
·
燃烧学
✓ 已验证
产品关联
DOI
高影响因子
COMBUSTION AND FLAME
·
2017
·
IF 3.663
Daolun Liang,Jianzhong Liu,Yunan Zhou,Junhu Zhou
Boron (B) has an extensive application prospect in the field of aerospace propulsion . A jet flow pressurized concentrated ignition experimental system was designed to evaluate the ignition and combustion characteristics of both coated and uncoated floating B particles under different oxygen pressures. Ammonium perchlorate (AP) and nitroguanidine (NQ) were chosen as the coating agents, while the oxygen pressures ranged from 2 to 10 atm. The results of microstructure analysis show that after coating, grains of the coating agent attached to the surface of B particles and enhanced the specific surface area. During the ignition experiments, the sample particles experienced two stages (ignition stage and combustion stage) successively, depending on the presence or absence of B 2 O 3 oxidation film. Both surface coating and increase in oxygen pressure can improve the ignition and combustion characteristics of the samples. Specifically, they can increase the combustion intensity, decrease the average ignition and combustion times (by up to 50%), and reduce their variations. Comparatively speaking, NQ coating showed more beneficial effects than AP coating. Therefore, the largest combustion intensity and shortest average ignition time and combustion time (4–5 and 5–6 ms, respectively) were achieved by the NQ coated sample at 10 atm oxygen pressure. Characteristic peaks of BO 2 , BO and Na (an impurity) were found in the maximum emission spectra of the samples. Increase in oxygen pressure was also found to be beneficial for improving the ignition and combustion characteristics of B particles coated with NQ.
研究领域:
推进技术
·
材料科学
·
燃烧学
·
航空航天工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2018
·
IF 3.193
Anna Zheng,Yongkang Huang,Yang You,Jian Hu,Dafu Wei,Xiang Xu,Yong Guan
The heat resistance enhancement of fluorosilicone rubber (FSR) can make it more suitable for cutting-edge applications and extreme conditions. This paper focused on the antioxidant properties of boron particles for FSR and the corresponding mechanism. The thermal stability of FSR and FSR/boron composites was characterized by thermal gravimetric analysis (TGA), isothermal degradation and thermal-oxidative ageing. The results showed that boron significantly improved the thermal stability of FSR. In particular, the FSR/boron (100/10) composite retained 95% of its weight after isothermal degradation at 350 °C for 12 h, while the FSR lost 55% of its weight within the initial 1 h. The antioxidant mechanism of boron was further investigated by chemiluminescence (CL), electron paramagnetic resonance (EPR) and vulcanization curves. It was shown that boron has powerful radical scavenging activity (RSA) and inhibited the oxidation scission of the side groups. Moreover, boron revealed no RSA towards the tert-butoxy radical, ensuring the good vulcanization of the FSR/boron composites.
研究领域:
高分子材料科学
·
橡胶化学
·
功能复合材料
·
热稳定性能
·
抗氧化机制
✓ 已验证
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2021
·
IF 1.513
Oussama Mehelli,Mehdi Derradji,Raouf Belgacemi,Slimane Abdous,Abdelmalek Habes,Wenbin Liu
Aiming the development of advanced and lightweight thermal neutrons shields, a new hybrid composite was developed from UHMWPE fibers, epoxy and boron carbide (B 4 C) particles. The UHMWPE fibres were chosen because of their high hydrogen contents and exceptional mechanical properties. The neutrons shielding tests were performed using an optimized experimental setup at NUR research reactor, Algiers. Overall, the developed materials displayed remarkable neutrons screening performances. Meanwhile, the best performance was recorded at B 4 C amount of 20 wt% with a macroscopic cross-section (Σ) of with a 0.313 cm −1 equivalent to a mean free path (λ) of 2.2 cm.
研究领域:
材料科学
·
核工程
·
复合材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jidong Zhang,Xuexi Zhang,Mingfang Qian,Junjian Zhou,Zhenggang Jia,Lin Geng
Nacre-inspired (TiBw-TiB 2p )/2024Al aluminum-matrix composites (AMCs) were fabricated using the pressure infiltration of molten Al into a porous TiBw-TiB 2p preform obtained by ice templating. Hot extrusion (475–520 °C) was utilized to control the nacre-inspired architecture and tailor the tensile properties of the nacre-inspired AMC. The continuous ceramic-rich layers transitioned to quasi-continuous ones after hot extrusion. As the extrusion temperature increased, the thickness of the ceramic-rich and Al layers decreased from 27.2 and 25.4 μm in the cast composite to 12.8 and 11.6 μm, respectively, in the composite extruded at 520 °C. The Al composite extruded at 520 °C exhibited an optimal balance between strength and ductility, with tensile strength and elongation reaching 470.5 MPa and 1.9 %, respectively, which was 21 % and 660 % higher than that of the cast composite. The improved strength and ductility of the high-volume Al composites (over 20 vol%) were attributed to the quasi-continuous architecture, which improved the plastic deformation ability of the ceramic-rich layers. For the composite extruded at 520 °C, the quasi-continuous architecture resulted in a back stress of up to 235 MPa higher than that of composites extruded at lower temperatures, accounting for 54 % of the flow stress. Additionally, the quasi-continuous architecture coordinated plastic deformation, mitigating the premature appearance of stress concentrations. This study provides a useful approach to enhancing the mechanical properties of nacre-inspired composites produced via ice templating, thereby broadening the range of applications for this technique.
研究领域:
材料科学
·
机械工程
·
复合材料
·
冶金学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）