scholarly journals Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects

10.3791/56479 ◽  
2017 ◽  
Author(s):  
Cédric Martin ◽  
Marc Comet ◽  
Fabien Schnell ◽  
Denis Spitzer
Keyword(s):  
Loose Powder

scholarly journals Combustion Synthesis of Aluminum Oxynitride in Loose Powder Beds

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4182
Author(s):  
Alan Wilmański ◽  
Magdalena Zarzecka-Napierała ◽  
Zbigniew Pędzich
Keyword(s):  
Combustion Synthesis ◽  
Metal Powder ◽  
Weight Ratio ◽  
Nitrogen Pressure ◽  
Alumina Powder ◽  
Metal Powders ◽  
Aluminum Oxynitride ◽  
Synthesis Conditions ◽  
Aluminum Metal ◽  
Loose Powder

This paper describes combusting loose powder beds of mixtures of aluminum metal powders and aluminum oxide powders with various grain sizes under various nitrogen pressure. The synthesis conditions required at least 20/80 weight ratio of aluminum metal powder to alumina powder in the mix to reach approximately 80 wt% of γ-AlON in the products. Finely ground fused white alumina with a mean grain size of 5 μm was sufficient to achieve results similar to very fine alumina with 0.3 μm grains. A lower nitrogen pressure of 1 MPa provided good results, allowing a less robust apparatus to be used. The salt-assisted combustion synthesis upon addition of 10 wt% of ammonium nitrite resulted in a slight increase in product yield and allowed lower aluminum metal powder content in mixes to be ignited. Increasing the charge mass five times resulted in a very similar γ-AlON yield, providing a promising technology for scaling up. Synthesis in loose powder beds could be utilized for effective production of relatively cheap and uniform AlON powder, which could be easily prepared for forming and sintering without intensive grounding and milling, which usually introduce serious contamination.

Effects of Powder Characteristics on Selective Laser Melting of 316L Stainless Steel Powder

2011 ◽  
Vol 189-193 ◽  
pp. 3664-3667 ◽  
Author(s):  
Sheng Zhang ◽  
Qing Song Wei ◽  
Guang Ke Lin ◽  
Xiao Zhao ◽  
Yu Sheng Shi
Keyword(s):  
Stainless Steel ◽  
Selective Laser Melting ◽  
316L Stainless Steel ◽  
Fine Powder ◽  
Steel Powder ◽  
Laser Melting ◽  
Broad Size Distribution ◽  
Lower Oxygen ◽  
Powder Characteristics ◽  
Loose Powder

316L stainless steel parts were manufactured via selective laser melting . This work stu- dies the effects of powder characteristics such as particle size and particle shape composition on the density. It shows that the powder with a broad size distribution and using spherical fine powder can lead to an increase in the density of the loose powder and thus the densification of the laser melted powder. The aerosol powder forms parts of lower oxygen content well, and the density can reach to 90%.

Pulsed magnetron sputtering of chromium boride films from loose powder targets

2006 ◽  
Vol 200 (14-15) ◽  
pp. 4166-4173 ◽  
Author(s):  
M. Audronis ◽  
P.J. Kelly ◽  
R.D. Arnell ◽  
A.V. Valiulis
Keyword(s):  
Magnetron Sputtering ◽  
Chromium Boride ◽  
Loose Powder ◽  
Pulsed Magnetron

X-ray fluorescence analysis of Cr, As, Se, Cd, Hg, and Pb in soil using pressed powder pellet and loose powder methods

2009 ◽  
Vol 38 (5) ◽  
pp. 410-416 ◽  
Author(s):  
Yasuhiro Shibata ◽  
Junnosuke Suyama ◽  
Masaru Kitano ◽  
Toshihiro Nakamura
Keyword(s):  
Fluorescence Analysis ◽  
X Ray ◽  
Loose Powder

Loose-powder technique for X-ray fluorescence analysis of ancient pottery using a small (100 mg) powdered sample

2012 ◽  
Vol 41 (5) ◽  
pp. 288-297 ◽  
Author(s):  
Shintaro Ichikawa ◽  
Kenichi Nakayama ◽  
Toshihiro Nakamura
Keyword(s):  
Fluorescence Analysis ◽  
Powdered Sample ◽  
X Ray ◽  
Ancient Pottery ◽  
Loose Powder

Measurement of Loose Powder Density

2012 ◽  
Vol 510-511 ◽  
pp. 597-601
Author(s):  
S. Akhtar ◽  
A. Ali ◽  
A. Haider ◽  
M. Farooque
Keyword(s):  
Ceramic Powder ◽  
Volume Density ◽  
Conventional Technique ◽  
Die Design ◽  
Uniform Density ◽  
Metal Powders ◽  
Exact Mass ◽  
Powder Density ◽  
Powder Characteristics ◽  
Loose Powder

Powder metallurgy is a conventional technique for making engineering articles from powders. Main objective is to produce final products with the highest possible uniform density, which depends on the initial loose powder characteristics. Producing, handling, characterizing and compacting materials in loose powder form are part of the manufacturing processes. Density of loose metallic or ceramic powder is an important parameter for die design. Loose powder density is required for calculating the exact mass of powder to fill the die cavity for producing intended green density of the powder compact. To fulfill this requirement of powder metallurgical processing, a loose powder density meter as per ASTM standards is designed and fabricated for measurement of density. The density of free flowing metallic powders can be determined using Hall flow meter funnel and density cup of 25 cm3 volume. Density of metal powders like cobalt, manganese, spherical bronze and pure iron is measured and results are obtained with 99.9% accuracy.

F54 Optimized procedures for trace analysis in liquid or loose powder samples of light matrices

2006 ◽  
Vol 21 (2) ◽  
pp. 170-170
Author(s):  
B. Burton ◽  
L. Arias ◽  
D. Pecard
Keyword(s):  
Trace Analysis ◽  
Powder Samples ◽  
Loose Powder
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