Effect of mechanical activation of high specific surface area aluminium with PTFE on composite solid propellant

Gaurav, M; Ramakrishna, P. A.

doi:10.1016/j.combustflame.2016.01.019

Cited by 59 publications

(9 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The typical diameter of aluminum particles used in propellants is in the order of ~30 μm 7 . The burning rate of propellants can be increased by employing aluminum powders with higher specific surface area 8, 9 . Replacement of micro-aluminum powders by ANPs will increase the propellant burning rate by ~100% and always show low pressure-exponents in 1–12 MPa pressure range 10 .…”

Section: Introductionmentioning

confidence: 99%

Preparation of mono-dispersed, high energy release, core/shell structure Al nanopowders and their application in HTPB propellant as combustion enhancers

Wang

Shangguan³

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Mono-dispersed, spherical and core/shell structure aluminum nanopowders (ANPs) were produced massively by high energy ion beam evaporation (HEIBE). And the number weighted average particle size of the ANPs is 98.9 nm, with an alumina shell (3-5 nm). Benefiting from the passivation treatment, the friction, impact and electrostatic spark sensitivity of the ANPs are almost equivalent to those of aluminum micro powders. The result of TG-DSC indicates the active aluminum content of ANPs is 87.14%, the enthalpy release value is 20.37 kJ/g, the specific heat release S 1 /Δm 1 * (392-611 °C) which determined the ability of energy release is 19.95 kJ/g. And the value of S 1 /Δm 1 * is the highest compared with ANPs produced by other physical methods. Besides, the ANPs perfectly compatible with hydroxylterminated polybutadiene (HTPB), 3 wt. % of ANPs were used in HTPB propellant replaced micron aluminum powders, and improved the burning rate in the 3-12 MPa pressure range and reduced the pressure exponential by more than 31% in the 3-16 MPa pressure range. The production technology of ANPs with excellent properties will greatly promote the application of ANPs in the field of energetic materials such as propellant, explosive and pyrotechnics.The large specific surface area, high density, low consumption of oxygen, high volumetric heat of combustion and high reactivity made ANPs can be broadly used in propellants 1, 2 . Great attentions had been paid to aluminum nanoparticles because of their superior performances in burning and energy release, which is expected to solve the problems of aluminum micro-particles, existed in propellants 3-5 . The burning rate of the solid rocket propellants is one of the most important factors that determine the performance of rocket 6 . The typical diameter of aluminum particles used in propellants is in the order of ~30 μm 7 . The burning rate of propellants can be increased by employing aluminum powders with higher specific surface area 8,9 . Replacement of micro-aluminum powders by ANPs will increase the propellant burning rate by ~100% and always show low pressure-exponents in 1-12 MPa pressure range 10 . Besides, the burning rate of the solid propellants increases depending on the percentage of high-energy matters, ANPs, in the propellant content 6 .ANPs have small size and surface effects, and their surface atoms are not matched, which leads to the particles are in highly active state 2 . The high reactivity of ANPs have also caused aging problems, particularly in an environment of high relative humidity 11 . Another problem of using ANPs as additives in propellants is the original agglomeration, leading to heterogeneity of the mixtures and to coalescence of agglomerates in the heat penetration zone during combustion 12 . The near-surface combustion of ANPs controls the propellant burning rate, the high agglomeration level of ANPs points to low exponent of burning rate 10 . In order for any energetic material to have application, it must be sensitive enough to various stimuli to combus...

show abstract

Section: Introductionmentioning

confidence: 99%

Preparation of mono-dispersed, high energy release, core/shell structure Al nanopowders and their application in HTPB propellant as combustion enhancers

Wang

Shangguan³

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The first explosion experiments showed that the double W/PTFE system is difficult to be initiated by shock-wave loading [47]. An increase in the reactivity can be achieved by preliminary mechanical activation [50] and/or by activating additives such as aluminum and magnesium powders [38]. Aluminum powder was chosen as an activating additive.…”

Section: Resultsmentioning

confidence: 99%

Energetic Materials Based on W/PTFE/Al: Thermal and Shock-Wave Initiation of Exothermic Reactions

Saikov

Seropyan

Malakhov

et al. 2021

Metals

View full text Add to dashboard Cite

The parameters of combustion synthesis and shock-wave initiation of reactive W/PTFE/Al compacts are investigated. Preliminary thermodynamic calculations showed the possibility of combustion of the W/PTFE/Al system at high adiabatic temperatures (up to 2776 °С) and a large proportion of condensed combustion products. The effect of the Al content (5, 10, 20, and 30 wt%) in the W/PTFE/Al system on the ignition and development of exothermic reactions was determined. Ignition temperatures and combustion rates were measured in argon, air, and rarefied air. A correlation between the gas medium, rate, and temperature of combustion was found. The shock initiation in W/PTFE/Al compacts with different Al content was examined. The extent of reaction in all compacts was studied by X-ray diffraction. The compositions with 10 and 20 wt% Al showed the highest completeness of synthesis after combustion and shock-wave initiation.

show abstract

“…The specimen temperature was recorded on a computer using an analog-to-digital converter (ADC) [42]. This procedure determines the intensity of exothermic reaction and phase transitions in the specimen, similar to differential scanning calorimetry (DSC) and differential thermal analysis (DTA) used in the works [37,[43][44][45]. The phase composition of the products was characterized by X-ray diffraction (XRD, DRON-3M, Burevestnik, St. Petersburg, Russia).…”

Section: Methodsmentioning

confidence: 99%

Reactive Ni–Al-Based Materials: Strength and Combustion Behavior

Seropyan

Saikov

Андреев

et al. 2021

Metals

View full text Add to dashboard Cite

The effect of PTFE, continuous boron, and tungsten fibers on the combustion behavior and strength of reactive Ni–Al compacts was examined in this study. The introduction of continuous fibers into Ni–Al compacts according to the developed scheme was found to increase the flexural strength from 12 to 120 MPa. Heat treatment (HT), leading to chemical interaction of the starting components, increases the strength of compacts at temperatures not exceeding 550 °C. The combination of reinforcement and HT significantly increases the strength without reducing reactivity. Experimental results showed that strength and combustion rate increase with the reduction in PTFE to 1 wt % in Ni–Al compacts. A favorable effect of the addition of PTFE from 5 to 10 wt % on the reduction of the threshold for the shock-wave initiation of reactions in Ni–Al was established. The obtained results can be used to produce reactive materials with high mechanical and energy characteristics.

show abstract

Effect of mechanical activation of high specific surface area aluminium with PTFE on composite solid propellant

Cited by 59 publications

References 29 publications

Preparation of mono-dispersed, high energy release, core/shell structure Al nanopowders and their application in HTPB propellant as combustion enhancers

Preparation of mono-dispersed, high energy release, core/shell structure Al nanopowders and their application in HTPB propellant as combustion enhancers

Energetic Materials Based on W/PTFE/Al: Thermal and Shock-Wave Initiation of Exothermic Reactions

Reactive Ni–Al-Based Materials: Strength and Combustion Behavior

Contact Info

Product

Resources

About