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.

scholarly journals Plasma Spheroidisation of Irregular Ti6Al4V Powder for Powder Bed Fusion

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1763
Author(s):  
Nthateng Nkhasi ◽  
Willie du Preez ◽  
Hertzog Bissett
Keyword(s):  
Particle Size ◽  
Additive Manufacturing ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Metal Powder ◽  
Weight Ratio ◽  
High Strength ◽  
Powder Bed Fusion ◽  
Metal Powders ◽  
Powder Bed

Metal powders suitable for use in powder bed additive manufacturing processes should ideally be spherical, dense, chemically pure and of a specified particle size distribution. Ti6Al4V is commonly used in the aerospace, medical and automotive industries due to its high strength-to-weight ratio and excellent corrosion resistance properties. Interstitial impurities in titanium alloys have an impact upon mechanical properties, particularly oxygen, nitrogen, hydrogen and carbon. The plasma spheroidisation process can be used to spheroidise metal powder consisting of irregularly shaped particles. In this study, the plasma spheroidisation of metal powder was performed on Ti6Al4V powder consisting of irregularly shaped particles. The properties of the powder relevant for powder bed fusion that were determined included the particle size distribution, morphology, particle porosity and chemical composition. Conclusions were drawn regarding the viability of using this process to produce powder suitable for additive manufacturing.

INFLUENCE OF METAL POWDER PRODUCTION METHOD ON MICROSTRUCTURE AND FLUIDITY OF MAGNETICALLY ALLOY GRANULATE

2021 ◽  
Vol 2021 (9) ◽  
pp. 3-7
Author(s):  
Dmitriy Kostin ◽  
Aleksandr Amosov ◽  
Anatoliy Samboruk ◽  
Bogdan Chernyshev ◽  
Anton Kamynin
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Comparative Studies ◽  
Particle Morphology ◽  
Production Method ◽  
Magnetic Alloy ◽  
Gas Atomization ◽  
Metal Powders ◽  
Hard Magnetic Alloy

A comparison is made of the characteristics of metal powders of a hard magnetic alloy produced by centrifugal spraying and gas atomization. Comparative studies of particle morphology and particle size distribution of powders are presented in order to determine them.

Modeling the Production Technology of Fully-Pressed Bi-Metal Powder Materials and Products

2021 ◽  
Vol 316 ◽  
pp. 570-575
Author(s):  
Badrudin G. Gasanov ◽  
Abakar B. Gasanov ◽  
Artem A. Aganov
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Bulk Density ◽  
Size Distribution ◽  
Metal Powder ◽  
Production Technology ◽  
Powder Mixture ◽  
Geometric Parameters ◽  
Powder Materials ◽  
Loading Devices

The features of calculating the thickness of the layers of bimetallic powder products without holes and the type of bushings are shown. The effect of the particle size distribution of the powders, the kinematic and geometric parameters of the loading devices and molds on the mechanism of the expiration of the powder mixture and on the thickness of the layers of the molded product is studied. A technique has been developed for determining the dimensions of the feeder cassette and tooling, depending on the overall dimensions and thicknesses of the working layers, in the production of whole-pressed bimetallic products on press machines with a vertical arrangement of layers. It was found that the thickness of each layer of bimetallic products depends on the geometric parameters of the feeder cassette and tooling, bulk density, particle size distribution and other characteristics of the powders, as well as on the speed of lowering the lower punch ν1 .

scholarly journals Factors affecting the particle size distribution and rheology of brinzolamide ophthalmic suspensions

2020 ◽  
Vol 586 ◽  
pp. 119495 ◽  
Author(s):  
Anh Vo ◽  
Xin Feng ◽  
Deval Patel ◽  
Adil Mohammad ◽  
Darby Kozak ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Factors Affecting

Effect of the particulate morphology of resin on the gelation process of PVC plastisols

2017 ◽  
Vol 37 (8) ◽  
pp. 757-764 ◽  
Author(s):  
Yubi Ji ◽  
Zhao Yang ◽  
Min Shi ◽  
Hong Tan
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Key Factors ◽  
Factors Affecting ◽  
Gelation Process ◽  
Secondary Particles ◽  
Poly Vinyl Chloride ◽  
Opposite Behavior

Abstract The gelation process of poly(vinyl chloride) (PVC) plastisol is very important to ensure the quality of the product and is affected by the type of resins, plasticizers, and other additives. In this study, the gelation process of the as-prepared PVC plastisol was characterized by measuring the evolution of vibrational viscosity with temperature or time using a vibrational viscometer. Furthermore, the effect of some commercial resins with different particulate morphologies on the gelation process was investigated by synchronously combining scanning election microscopy and laser particle size analyses. The results of this study proved that the particle size distribution and the aggregation degree of the secondary particles of a resin are the key factors affecting the gelation process. For the resin with bimodal particle size distribution, the closer the aggregation of the secondary particles, the slower the gel speed; however, an opposite behavior was observed for the resins with unimodal particle size distribution.

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