Obtaining Nanopowder Pseudo-Ligatures Al-(SiC+Si3N4) for Modification of Aluminum Alloys

2016 ◽  
Vol 684 ◽  
pp. 310-315
Author(s):  
Antonina A. Kuzina ◽  
Anna V. Kuts
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Distribution Density ◽  
Hydraulic Press ◽  
Planetary Mill ◽  
Powder Particle Size ◽  
Technological Properties ◽  
Mechanical Mixing ◽  
Powder Mixtures ◽  
Bulk Weight

It was investigated the mechanical mixing and compacting briquettes of aluminum powder (particle size 75...250 μm) and nanopowder modifier SiC+Si3N4 (particle size 70...100 nanometers), obtained by the azide technology SHS. The mixtures containing 2.5%, 5%, 10%, 15% of the modifier were investigated. Mechanical mixing was carried out during 60 minutes in planetary mill «Pulverizette-5». Some physic-technological properties of the obtained powder mixtures, such as, particle size distribution, density, bulk weight and flowability, are determined. The powder compositions pressing was carried out on hydraulic press PSU-50 with pressure 25...90 MPa. Nanopowder pseudo-ligatures of 18 mm diameter, height to 4.6 mm, weighing 2.5 grams, with relative density 77...93%, intended for subsequent input in aluminum melt with the aim of modification are obtained.

Obtaining Nanopowder Ligature Briquettes Ni-(SiC+Si3N4) for Modification of Aluminum Alloys

2016 ◽  
Vol 685 ◽  
pp. 558-562
Author(s):  
Antonina A. Kuzina ◽  
Valentina S. Ruchkina
Keyword(s):  
Particle Size ◽  
Nickel Powder ◽  
Distribution Density ◽  
Hydraulic Press ◽  
Planetary Mill ◽  
Powder Particle Size ◽  
Technological Properties ◽  
Mechanical Mixing ◽  
Powder Mixtures ◽  
Bulk Weight

The authors investigated the mechanical mixing and compacting briquettes of nickel powder (particle size 30...75 μm) and nanopowder modifier SiC+Si3N4 (particle size 70...100 nanometers), obtained by the azide technology SHS. The mixtures containing 5%, 10%, 15%, 20% of the modifier were investigated. Mechanical mixing was carried out during 60 minutes in planetary mill «Pulverizette-5». Some physic-technological properties of the obtained powder mixtures, such as, particle size distribution, density, bulk weight and flowability, are determined. The powder compositions' pressing was carried out on hydraulic press PSU-50 with pressure 65...700 MPa. Nanopowder ligature briquettes of 18.2 mm diameter, height to 4.2 mm, weighing 5 grams, with relative density 70...89% and porosity 11...30%, intended for subsequent input in aluminum melt with the aim of modification are obtained.

scholarly journals Effect of Particle Size Distribution on Powder Packing and Sintering in Binder Jetting Additive Manufacturing of Metals

2017 ◽  
Vol 139 (8) ◽  
Author(s):  
Yun Bai ◽  
Grady Wagner ◽  
Christopher B. Williams
Keyword(s):  
Particle Size ◽  
Additive Manufacturing ◽  
Large Degree ◽  
Full Density ◽  
Powder Particle Size ◽  
Powder Mixtures ◽  
Fine Powders ◽  
Sintering Shrinkage ◽  
The Impact ◽  
Binder Jetting

The binder jetting additive manufacturing (AM) process provides an economical and scalable means of fabricating complex parts from a wide variety of materials. While it is often used to fabricate metal parts, it is typically challenging to fabricate full density parts without large degree of sintering shrinkage. This can be attributed to the inherently low green density and the constraint on powder particle size imposed by challenges in recoating fine powders. To address this issue, the authors explored the use of bimodal powder mixtures in the context of binder jetting of copper. A variety of bimodal powder mixtures of various particle diameters and mixing ratios were printed and sintered to study the impact of bimodal mixtures on the parts' density and shrinkage. It was discovered that, compared to parts printed with monosized fine powders, the use of bimodal powder mixtures improves the powder's packing density (8.2%) and flowability (10.5%), and increases the sintered density (4.0%) while also reducing the sintering shrinkage (6.4%).

Tape Casting of BaTiO3

1984 ◽  
Vol 40 ◽  
Author(s):  
J. B. Blum ◽  
W. R. Cannon
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Glass Plate ◽  
Tape Casting ◽  
Phosphate Ester ◽  
Powder Particle Size ◽  
Drying Method ◽  
Ultrasonic Dispersion ◽  
The Past

AbstractFor the past two years we have been investigating the tape casting of BaTiO3 Specifically we have been interested in developing a useful tape casting formulation and procedure and in studying the effects of powder particle size distribution and dispersion processes on the forming of BaTiO3 tapes.The formulation we have developed is non-aqueous. An MEKethanol mixture is the solvent and an acrylic binder is used. Two dispersants are being used, a phosphate ester and Menhaden fish oil. Ultrasonic dispersion was found to be effective in breaking up weak powder agglomerates. We have found it important to add the dispersant before adding other organic components to obtain the best dispersion and strongest tapes. The drying method is also important to tape strength. The strongest tapes resulted when the tape was removed from the glass plate soon after casting. We have also demonstrated that for forming purposes a wide particle size distribution is preferred.

On the Microstructural Evolution and Porosity Consolidation in 316L Stainless Steel During Hot Isostatic Pressing

2019 ◽  
Author(s):  
Adam J. Cooper ◽  
Olivia C. G. Tuck ◽  
Samuel A. J. Armson ◽  
Michael Preuss
Keyword(s):  
Particle Size ◽  
Stainless Steel ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Powder Particle ◽  
316L Stainless Steel ◽  
Hot Isostatic Pressing ◽  
Nuclear Industry ◽  
Powder Particle Size ◽  
Isostatic Pressing

Abstract If advanced manufacturing technologies are to be adopted over conventional manufacturing processes in the nuclear industry — the most regulatory challenging industry — rigorous fundamental studies that develop underpinning knowledge, materials performance data, and predictive capabilities are essential. Herein we have employed the use of electron backscatter diffraction (EBSD) and 3D X-ray computed tomography (XCT) to characterize microstructure evolution and porosity consolidation during the early stages of powder metallurgy hot isostatic pressing (PM-HIP). The data herein highlight the mechanisms through which the powder particle size distribution encourages localized plastic deformation and subsequent microstructural recrystallization of Type 316L stainless steel; the effect of powder particle size distribution on the rate of porosity consolidation is also discussed. Specifically, we have determined the temperature and pressure conditions that are required to initiate dynamic recrystallization during HIP, and explain how this is influenced by the powder particle size distribution.

SIEVING OF POWDERS ADDITIVE AND POWDER MANUFACTURINGS (review)

2020 ◽  
pp. 11-20
Author(s):  
A.E. Knyazev ◽  
◽  
A.V. Vostrikov ◽  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Metal Powder ◽  
Metal Powders ◽  
Technological Properties ◽  
Factors Affecting ◽  
Ultrasonic Cleaning

Considers the features of powders obtained by various methods, their technological properties in relation to additive and granular manufacturing. The sequence of operations upon receipt of metal powder compositions is presented. The factors affecting the process of vibration sieving of metal powders and granules are described. The features and advantages of vibratory sieving on horizontally arranged circular sieves using ultrasonic cleaning to obtain specified trajectories of motion are shown. Criteria for evaluating the sieving efficiency are given and explanations are given for determining the particle size distribution of powders and granules.

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