Controlling powder bulk density by optimizing particle size and shape distribution

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00:00:00 Welcome
00:00:14 Introduction
00:00:55 Controlling powder bulk density by optimizing particle size and shape distribution
00:01:21 Abstract
00:01:50 Amazing fact # 99
00:02:47 Obligatory Opening Quotation (O2Q)
00:04:31 Obligatory Opening Quotation (O2Q) - 2
00:04:44 Format
00:05:36 Caution
00:08:04 Tableting (Am. spelling)
00:10:42 Plastic flow or brittle fracture?
00:11:10 Plastic flow or brittle fracture?
00:12:54 Dry/direct compaction
00:13:27 Dry/direct compaction - disadvantages
00:14:07 Factors influencing dispersion rheology
00:14:55 Particle size
00:16:25 Effect of particle size on viscosity
00:17:16 Particle size distributions
00:18:30 Particle size distribution
00:19:08 Effect of particle size distribution on viscosity
00:20:04 Effect of particle shape on viscosity
00:20:09 Effect of particle shape on viscosityShear thinning
00:20:57 Effect of particle size on tablet strength*
00:21:38 Key factors: particle size and shape
00:22:36 Ideal material
00:24:09 Effects of physical properties for starch acetate powders on tableting*
00:24:37 Ceramics
00:25:00 Ceramics – the challenge
00:26:07 Strength of materials
00:27:24 Propagation of cracks
00:27:29 Propagation of cracks – after Somasundaran
00:28:42 Useful paper
00:30:20 This leads to the comminution limit (CL)
00:31:43 And a slide I’ve used a lot…based on Kevin Kendall
00:32:31 And why are cracks important?
00:33:27 Agglomeration
00:34:02 Sintered metal components – powder metallurgy
00:34:07 Sintering time – Herring’s equation
00:34:12 Effect of shape
00:34:58 Effect of shape
00:35:44 Penrose tiling
00:36:27 Escher – my favorite (mathematical) artistAngels and Demons
00:36:54 The challenge
00:37:07 High strength materials
00:38:12 Pittcon 2014 & 2015 – a 3-D problemHow many candies in the jar? (10159 actually)
00:38:39 Important properties - particle size distribution
00:39:13 Adapted from PietschW Pietsch “Size enlargement by agglomeration” John Wiley & Sons (1999)
00:40:22 Pietsch (continued)
00:40:50 Dinger-Funk equation
00:41:47 Ideal particle size distribution – plotted on log-log paper
00:42:05 Here’s my D-F plots for the Mastersizer 3000
00:42:32 Packing density
00:43:35 More applications you may not have considered
00:44:27 First, some more theory
00:44:32 Kyrylyuk – Slide 26
00:45:11 Kyrylyuk – Slide 27
00:45:42 Kyrylyuk – Slide 34
00:46:02 Jean-Louis SalagerUniversidad de Los AndesMérida, Venezuela
00:46:59 Chapter by Piet Stroeven & Huan He
00:47:25 Asphalt/bitumen
00:47:49 References
00:48:46 References
00:49:29 Thank you!
00:50:22 Thank you for your attentionAny questions?
00:53:53 Contact Info
Bulk density is a property of particulate matter including powders, granules or larger aggregates and is a measure of the weight per unit volume of a collection of particles. The control of bulk density is important for a variety of reasons.

For example, the compression conditions for a pharmaceutical tablet and the porosity of a ceramic green body are related to powder bulk density as are packaging requirements for storage or transport of a powder mass.

Powder particle size and shape distributions govern how particles can and will pack together and hence will influence a powders bulk density. The presence of voids and agglomerates also affect bulk density and can lead to areas of weakness in a structure (such as ceramics and sintered metal components) that industries aim to minimize by careful control of size and shape distributions.

This webinar explores the packing of materials from a semi-theoretical aspect leading onto the factors that lead to optimum packing of denser structures in the ceramics (size, shape, zeta potential) and sintered metal powder compaction industries.