COMBUSTION OF A FROZEN MIXTURE OF BI-DISPERSED ALUMINUM-WATER POWDER

2020 ◽  
Author(s):  
V. A. Poryazov ◽  
◽  
A. Yu. Krainov ◽  
Keyword(s):  
Aluminum Powders ◽  
Dispersed Aluminum

The paper presents a model of combustion of a frozen mixture of nano- and micronsized aluminum powders with water.

Highly borated dispersed aluminum: experimental evaluation of its neutron-shielding properties

2021 ◽  
Vol 1 ◽  
pp. 67-72
Author(s):  
V.S. Yusupov ◽  
◽  
S.I. Tyutyunnikov ◽  
V.A. Artyukh ◽  
T.L. Enik ◽  
...  
Keyword(s):  
Morphological Analysis ◽  
Fibrous Composite ◽  
Comparative Assessment ◽  
Amorphous Boron ◽  
Neutron Shielding ◽  
Aluminum Powders ◽  
Absorbing Materials ◽  
Shielding Properties ◽  
Dispersed Aluminum ◽  
Scanning Electron

By the method of mechanical alloying, compaction and thermosynthesis of a mixture of amorphous boron and aluminum powders, a prototype of highly borated (~50 wt.%) dispersed boron-aluminum was obtained. A comparative assessment of the neutron-shielding properties of borated dispersed aluminum and fibrous boron-aluminum VKM Al-B under irradiation with neutrons with a flux density of 1.4·106 n/cm²·s with a fluence of 3·109 n/cm2 was carried out. Using optical and scanning electron microscopy, a morphological analysis of samples of dispersed-borated powdered aluminum and fibrous-composite boron-aluminum was carried out. It was found that in both materials the level of absorption of neutrons with energies of 0.02-0.05 eV is up to 99.5-99.95%. It is concluded that highly borated dispersed boron-aluminum supplements the line of known boron-containing neutron-absorbing materials with the possibility of using it up to temperatures of 500-700°C.

scholarly journals Modeling the Structure and Processes of Heat Transfer in Beds of Aluminum Micro- and Nanopowders

2021 ◽  
Vol 2096 (1) ◽  
pp. 012164
Author(s):  
Yu P Zarichnyak ◽  
V A Ivanov ◽  
A A Marova ◽  
I N Nikolaev ◽  
V P Khodunkov
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Total Porosity ◽  
Granular Structure ◽  
Particle Sizes ◽  
Aluminum Powders ◽  
Wide Range ◽  
Significant Change ◽  
Dispersed Aluminum

Abstract A model of the structure and a method for calculating (forecasting) the thermal conductivity of beds from coarse to nano-dispersed aluminum powders are developed. A significant change in the thermal conductivity of the particles themselves was taken into account during the transition from the micro-meter to the nanometer-sized range of particle sizes. The thermal conductivity was calculated over a wide range of particle sizes, granular structure skeleton porosity, and total porosity of the beds.

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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