Shock Compressibility of Mixtures of Microand Nano-Sized Nickel and Aluminum Powders

2018 ◽  
Keyword(s):  
Aluminum Powders ◽  
Shock Compressibility

Role of Constituent Configuration on Shock-Induced Reactions in a Ni+Al Powder Mixture

2005 ◽  
Vol 896 ◽  
Author(s):  
Daniel Eakins ◽  
Naresh Thadhani
Keyword(s):  
Particle Size ◽  
Powder Mixture ◽  
Energetic Materials ◽  
Propagation Speed ◽  
Nickel Particle ◽  
Shock Propagation ◽  
Powder Mixtures ◽  
Aluminum Powders ◽  
Shock Compressibility

AbstractUltra-fast reactions initiated within or immediately behind the shock front in powder mixtures are of importance in the synthesis of high-pressure phases and next-generation energetic materials. Reactions in nickel and aluminum powder mixtures and the establishment of a reaction threshold have been the source of many studies over the last 20 years. Prior work has suggested that the criterion for reaction is most probably mechanochemical in nature, in which shock loading environment plays a larger role than absolute shock energy input. The mechanisms responsible for intimate mixing of fresh reactants are however still unclear. In this work we are investigating the role of particle size and morphology on the loading, mixing, and their subsequent shock-induced reaction behavior, by performing shock-compressibility experiments on equi-volumetric mixtures of nickel and aluminum powders, with variations in nickel particle size (micron and nano-scale) and shape (spherical and flake). Determination of shock states is accomplished through time-resolved in situ PVDF gauge measurements of input shock stress and shock propagation speed obtained from transit time through the thickness of powder mixture. The reaction product shock-compressibility state is also being calculated based on constant pressure approximations to allow correlation with measured states for inference of the occurrence of shock-induced chemical reactions. The results of this study suggest that powder configuration in the nickel-aluminum system can be modified to encourage or discourage reaction.

Shock Compressibility of Mixtures of Micro- and Nano-Sized Nickel and Aluminum Powders

2018 ◽  
Vol 54 (5) ◽  
pp. 552-557
Author(s):  
V. V. Yakushev ◽  
S. Yu. Ananev ◽  
A. V. Utkin ◽  
A. N. Zhukov ◽  
A. Yu. Dolgoborodov
Keyword(s):  
Aluminum Powders ◽  
Shock Compressibility

scholarly journals Shock Compressibility, Adiabatic Expansion and Equation of State of Stylbene.

1998 ◽  
Vol 7 ◽  
pp. 838-840
Author(s):  
M. V. Zhernokletov ◽  
K. V. Khishchenko ◽  
I. V. Lomonosov ◽  
Yu. N. Sutulov
Keyword(s):  
Equation Of State ◽  
Adiabatic Expansion ◽  
Shock Compressibility

scholarly journals Oxidation of nano-sized aluminum powders

2016 ◽  
Vol 636 ◽  
pp. 48-56 ◽  
Author(s):  
A.B. Vorozhtsov ◽  
M. Lerner ◽  
N. Rodkevich ◽  
H. Nie ◽  
A. Abraham ◽  
...  
Keyword(s):  
Aluminum Powders

Influence of Different Dispersants on the Dispersion Property of Nano-Aluminium Powders

2011 ◽  
Vol 71-78 ◽  
pp. 122-125 ◽  
Author(s):  
Ling Li Song ◽  
Ren Yuan Zhang ◽  
Ling Bo Mao ◽  
Wen Jie Zhu ◽  
Miao Yan Zheng
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Ultrasonic Vibration ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Sodium Dodecyl ◽  
Dispersion Property ◽  
Ammonium Bromide ◽  
Aluminum Powders ◽  
Ultrasonic Time ◽  
Dodecyl Sulfate ◽  
Cetyl Trimethyl Ammonium

The influences of dispersant type, supersonic time and concentration on the dispersion property of the nano-aluminium powders in glycol water were systematically studied by using Sodium dodecyl sulfate (SDS)，cetyl trimethyl ammonium bromide (CTAB) and sodium hexa metah posphate（SHMP）as dispersants. During the first stage of the experiments, influences of dispersant type and ultrasonic time with these dispersants were evaluated. The next stage of the study was focused on SHMP concentration. The influence of SHMP concentration was assessed. The results show that with the increasing of ultrasonic time, the dispersion property of nano-aluminum powders first increases and then decreases, and SHMP is the best one. The excellent dispersing condition on the dispersion property of nano-aluminium is: 5g/L SHMP and 50 min ultrasonic vibration.

Effect of Porosity Content on the Weldability of Powder Metal Parts Produced by Friction Stir Welding

2007 ◽  
Vol 534-536 ◽  
pp. 789-792 ◽  
Author(s):  
Adem Kurt ◽  
Ilyas Uygur ◽  
Hakan Ates
Keyword(s):  
Friction Stir Welding ◽  
Powder Metal ◽  
Aluminum Powders ◽  
Friction Stir ◽  
Metal Parts ◽  
Constant Friction ◽  
Sintered Powder ◽  
Hardness Values ◽  
Welding Technique ◽  
Traveling Speed

Friction stir welding technique (FSW) has many advantages in terms of tool design, rotational speed and traveling speed, and can be adjusted in a precise manner. It enables heat input into the system to be controlled. In this study, Aluminum powders were compacted at 350,400 and 450 MPa pressure and sintered at 450 oC temperature for 30 minutes in Ar atmosphere. Sintered powder metal parts were joined to each other by FSW at the speed of 1800 rpm and traveling welding speed 200 mm/min under a constant friction force. The results show that the amount of porosity affects the weldability of powder metallurgy (P/M) parts. Furthermore, the porosity and microstructural evolution of the Aluminum also affected the hardness values of the tested materials.

Hydrostatic pressing of aluminum powders

1974 ◽  
Vol 13 (12) ◽  
pp. 956-957
Author(s):  
D. M. Karpinos ◽  
B. I. Beresnev ◽  
V. Kh. Kadyrov ◽  
A. G. Kamenetskii ◽  
N. B. Gal'chun
Keyword(s):  
Aluminum Powders

Combustion joinining of carbon/carbon composites by a reactive mixture of titanium and mechanically activated nickel/aluminum powders

2013 ◽  
Vol 39 (7) ◽  
pp. 7499-7505 ◽  
Author(s):  
Ya-Cheng Lin ◽  
Andrey A. Nepapushev ◽  
Paul J. McGinn ◽  
Alexander S. Rogachev ◽  
Alexander S. Mukasyan
Keyword(s):  
Carbon Composites ◽  
Nickel Aluminum ◽  
Aluminum Powders ◽  
Reactive Mixture
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