Preparation and oxidation of aluminum powders with surface alumina replaced by iron coating

Ali, Rashid; Ali, Fahad; Zahoor, Aqib; Shahid, Rub Nawaz; Tariq, Naeem ul Haq; Ali, Ghulam; Ullah, Saad; Shah, Attaullah; Awais, Hasan Bin

doi:10.1080/07370652.2020.1859647

Cited by 7 publications

(4 citation statements)

References 34 publications

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“…The bath composition, along with process parameters used for copper deposition, is summarized in Table 1. After deposition, Al/Cu core-shell powder was filtered, rinsed with hot distilled water, After pretreatment (etching), the smooth surface of aluminum particles became rough as reported in our previous work [33]. These roughened particles were immersed in the deposition bath for a particular time.…”

Section: Methodsmentioning

confidence: 99%

Microstructural and mechanical behavior of unique aluminum matrix composites reinforced with pre-synthesized Al/Cu core-shell particulates

Rashid¹,

Rehman²,

Zia³

et al. 2023

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In this study, Al matrix composites (AMCs) reinforced with Al/Cu core-shell particles were synthesized by hot pressing. The Al/Cu particulate reinforcements were pre-synthesized by galvanic replacement. The effect of the volume fraction of reinforcement on the microstructure and mechanical behavior of the composites was investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), micro-hardness and compression tests. The strength of the composite becomes 2.25 times the matrix by using 20 vol.% core-shell reinforcements containing only 6 vol.% Cu. Further, with increasing volume fraction of Al/Cu reinforcement, the degree of in-situ transformation of Cu into intermetallic also increases. Consequently, a specially tailored microstructure can be obtained by controlling the volume fraction of the reinforcement and its interfacial reaction with the matrix, which can improve the mechanical strength of composites without considerably compromising on fracture strain. The findings of this work provide stronger implications for the industry to fabricate viable engineering structures. K e y w o r d s : core-shell powder, galvanic replacement plating, interfacial reaction, hotpressing, composite

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Section: Methodsmentioning

confidence: 99%

Microstructural and mechanical behavior of unique aluminum matrix composites reinforced with pre-synthesized Al/Cu core-shell particulates

Rashid¹,

Rehman²,

Zia³

et al. 2023

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“…The modification and enhancement of Al powder with various metallic elements have been found to significantly improve combustion efficiency and reduce the particle size of condensed phase combustion products in the combustion of propellants. Noteworthy influences include alkali metals (e.g., Li) [9][10][11], alkaline earth metals (e.g., Mg) [12][13][14], and transition metals (e.g., Fe, Co, Ni, Ti) [15][16][17]. A composite modification of Al powder with metallic elements weakens the protectivity of the alumina shell on its surface, facilitating the faster diffusion of oxidizers towards the Al core.…”

Section: Introductionmentioning

confidence: 99%

Enhancing RDX Thermal Decomposition in Al@RDX Composites with Co Transition Metal Interfacial Layer

Yang,

Xie,

Wang

et al. 2024

Aerospace

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In this study, an Al/Co@RDX composite was meticulously prepared through a combination of planetary high-energy ball-milling and a spray-drying technique. The thermal reactivity of these Al/Co@RDX composites was comprehensively investigated and compared using the TG/DSC technique. It is shown that the initial decomposition temperature of RDX in the DSC curve was decreased by 26.3 °C in the presence of Al/Co, which could be attributed to the nano-sized Co transition metal catalyzing the decomposition reaction of nitrogen oxides in RDX decomposition products. The decomposition peak temperature of RDX and the heat released by the thermal decomposition of RDX in the Al/Co@RDX composite were decreased by 26.3 °C and increased by 74.5 J·g−1, respectively, in comparison with those of pure RDX. The types of major gaseous products released from Al/Co@RDX were found to be identical to those of pure RDX, encompassing N2O, CH2O, CO2 and HCN. However, the concentrations of those gaseous products for Al/Co@RDX were higher than those observed for pure RDX, which may owe to the fact that the Al/Co composite can interact with the –CH2 and –NO2 within RDX molecules, which leads to the weakening of the C-N and N-N bonds. In addition, the decomposition of RDX in the Al/Co@RDX composite was observed as a one-step process with an apparent activation energy (Ea) of 115.6 kJ·cm−3. The decomposition mechanism of the RDX in the Al/Co@RDX composite was identified to follow the chain scission model (L2), whereas the two-step decomposition physical models observed for pure RDX were found to closely resemble the L2 and autocatalytic models.

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“…Attempts at formulating aluminum/fluoropolymer composite non-propellant energetics systems have led to specific interest in the nano-aluminum (nAl)/fluoropolymer composites due to the high specific surface area of the reactants, which increase the reactivity of the system by significantly reducing the physical separation between the fuel and oxidizer, thereby resulting in kinetically governed combustion regimes that are not limited by the diffusion of fuel and oxidizer species into the reaction zone [19]. Some approaches have included embedding nAl into fluorinated epoxy-based matrices [20,21], electrospray deposition of nAl/ PVDF composites [22][23][24], surface functionalization of nAl [25][26][27][28][29][30][31], fluoropolymer-coated nAl composites [32,33], loose-powder nAl/PTFE systems [5,34], and mechanically activated Al/fluoropolymer additives [2][3][4]35]. More recently, additive manufacturing of nAl/fluoropolymer composites has enabled unique geometries and tailorability for Al/fluoropolymer additives.…”

Section: Introductionmentioning

confidence: 99%

On the Use of Fluorine‐Containing Nano‐Aluminum Composite Particles to Tailor Composite Solid Rocket Propellants

Uhlenhake

Yehia

Noel

et al. 2022

Propellants Explo Pyrotec

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The burning rate of solid propellants is an important factor for optimizing rocket motors and improving performance. The enhanced burning rate can increase thrust and reduce a propulsion system's overall size and weight. In this study, a novel nano-aluminum/THV composite additive was prepared and introduced into a solid ammonium perchlorate/polybutadiene composite solid rocket propellant to enhance its burning rate. The morphology of the composite particle additive and its effects on combustion were characterized. The use of small quantities (< 15 wt.%) of the additive resulted in a burning rate enhancement of up to 2.1 times that of the conventional coarse aluminized propellant with a specific impulse loss of only 3 seconds, and as much as 4.7 times enhancement with a predicted loss of 22 seconds in theoretical specific impulse. Some of this loss may be recovered by the improved combustion efficiency in smaller rocket motors because the additive was shown to significantly reduce the aluminum agglomeration at the propellant burning surface and reduce the size of reaction products which may reduce two-phase flow losses. The additive also provides wide burning rate tailorability, favorable for motor, grain, and thrust curve design. The burning rate enhancement mechanism is thought to be a physical cratering mechanism governed by the burning rate disparity between the binder/oxidizer system and the nano-aluminum/fluoropolymer additive and not a chemical catalytic effect.

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Preparation and oxidation of aluminum powders with surface alumina replaced by iron coating

Cited by 7 publications

References 34 publications

Microstructural and mechanical behavior of unique aluminum matrix composites reinforced with pre-synthesized Al/Cu core-shell particulates

Microstructural and mechanical behavior of unique aluminum matrix composites reinforced with pre-synthesized Al/Cu core-shell particulates

Enhancing RDX Thermal Decomposition in Al@RDX Composites with Co Transition Metal Interfacial Layer

On the Use of Fluorine‐Containing Nano‐Aluminum Composite Particles to Tailor Composite Solid Rocket Propellants

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