Gasless combustion of metal powder mixtures

Naiborodenko, Yu. S.; Итин, В. И.

doi:10.1007/bf00740533

Cited by 114 publications

(32 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These parameters included variations in Ni particle size, heating rates and reaction atmosphere. In all these experiments, it was observed that the combustion behaviour of powder compacts of stoichiometric NiAl composition was similar both under vacuum and in argon essentially signifying the gasless nature of the reaction and corroborating the observations of Naiborodenko et al [4,21]. Coarse Ni powders namely, Ni 2 and Ni 3 showed remarkable similarity in their response to various synthesis experiments.…”

Section: Discussionsupporting

confidence: 70%

“…Interestingly, the combustion synthesis technique can be judiciously employed to fulfill both. Therefore, there were many studies on the combustion synthesis of nickel aluminide in both plane wave propagation (PWP) [4] and thermal explosion mode [5], its mechanisms of structure formation [6], influence of initial conditions on combustion [7] and densification characteristics [5]. Dunand [8], in an exhaustive compilation, reviewed the different reactive synthesis techniques including combustion synthesis, used for the aluminides by different researchers with special emphasis to nickel aluminides.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A study of self-propagating high-temperature synthesis of NiAl in thermal explosion mode

et al. 2002

View full text Add to dashboard Cite

Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

A study of self-propagating high-temperature synthesis of NiAl in thermal explosion mode

et al. 2002

View full text Add to dashboard Cite

“…Taking into account both loose powder mixtures and cold-pressed compacts, typical combustion velocities have been reported to be on the order of 1-12 cm/s. 4,26 Recently, Bacciochini et al 4 reported combustion velocities for thermally ignited MA Ni/Al compacts cold-pressed to 40%-80% TMD in the range of 3-6 cm/s. The combustion velocities in this work are 4-10 Â faster than those.…”

Section: -4mentioning

confidence: 99%

The role of microstructure refinement on the impact ignition and combustion behavior of mechanically activated Ni/Al reactive composites

Mason

Groven

Son

2013

Journal of Applied Physics

View full text Add to dashboard Cite

Metal-based reactive composites have great potential as energetic materials due to their high energy densities and potential uses as structural energetic materials and enhanced blast materials however these materials can be difficult to ignite with typical particle size ranges. Recent work has shown that mechanical activation of reactive powders increases their ignition sensitivity, yet it is not fully understood how the role of microstructure refinement due to the duration of mechanical activation will influence the impact ignition and combustion behavior of these materials. In this work, impact ignition and combustion behavior of compacted mechanically activated Ni/Al reactive powder were studied using a modified Asay shear impact experiment where properties such as the impact ignition threshold, ignition delay time, and combustion velocity were identified as a function of milling time. It was found that the mechanical impact ignition threshold decreases from an impact energy of greater than 500 J to an impact energy of $50 J as the dry milling time increases. The largest jump in sensitivity was between the dry milling times of 25% of critical reaction milling time (t cr ) (4.25 min) and 50% t cr (8.5 min) corresponding to the time at which nanolaminate structures begin to form during the mechanical activation process. Differential scanning calorimetry analysis indicates that this jump in the sensitivity to thermal and mechanical impact is dictated by the formation of nanolaminate structures, which reduce the temperature needed to begin the dissolution of nickel into aluminum. It was shown that a milling time of 50%-75% t cr may be near optimal when taking into account both the increased ignition sensitivity of mechanical activated Ni/Al and potential loss in reaction energy for longer milling times. Ignition delays due to the formation of hotspots ranged from 1.2 to 6.5 ms and were observed to be in the same range for all milling times considered less than t cr . Combustion velocities ranged from 20-23 cm/s for thermally ignited samples and from 25-31 cm/s for impacted samples at an impact energy of 200-250 J.

show abstract

“…The stability limit for the propagation of a pulsating exothermic reaction front in the condensed phase was established by Shkadinskii et al [8] who showed that the boundary between stable and oscillatory combustion can be described by the following function: (see the nomenclature), Oscillating combustion takes place for ~ < 1 and steady-state combustion may be obtained for ~ > 1. Experimental verification of this numerically derived equation has been given in [6]. Oscillatory combustion results in an alternating increase and decrease of the temperature and velocity, and the front propagates in a succession of rapid and slow jumps resulting in a banded structure.…”

mentioning

confidence: 95%

“…Due to the large number of variables involved in micropyretic synthesis, a proper control of the processing of the micropyretic synthesized products is of importance. Several papers [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] have dealt with the modelling of combustion synthesis using a one-dimensional analysis. There have also been numerous observations of oscillatory, spinning and other time-dependent modes of combustion [6][7][8].…”

mentioning

confidence: 99%

Influence of multi-dimensional oscillating combustion fronts on thermal profiles

Lakshmikantha

Sekhar

1993

J Mater Sci

View full text Add to dashboard Cite

A multi-dimensional numerical model for micropyretic/combustion synthesis was developed and then applied to a special configuration. The configuration was chosen to illustrate the differences between one-dimensional and two-dimensional combustion. The features of the model include the melting of each constituent of the reactants and the products, and consderations of porosity for both the reactants and the products. Application of this model to the oscillatory combustion synthesis of TiB= has been carried out, for the first time, to study two-dimensional-combustion-front movement. The model predicts higher hot-spot temperatures in a two-dimensional situation than those obtained in a one-dimensional experiment. Additionally, hot spots are noted to traverse along orthogonal directions. Some processing implications of such results are examined.

show abstract

Gasless combustion of metal powder mixtures

Cited by 114 publications

References 4 publications

A study of self-propagating high-temperature synthesis of NiAl in thermal explosion mode

A study of self-propagating high-temperature synthesis of NiAl in thermal explosion mode

The role of microstructure refinement on the impact ignition and combustion behavior of mechanically activated Ni/Al reactive composites

Influence of multi-dimensional oscillating combustion fronts on thermal profiles

Contact Info

Product

Resources

About