Fecha registrada: October 06 2016

Duration: 56 minutes 35 seconds

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.
Table of contents
1. Welcome
00:14
2. Introduction
00:41
3. Controlling powder bulk density by optimizing particle size and shape distribution
00:26
4. Abstract
00:29
5. Amazing fact # 99
00:57
6. Obligatory Opening Quotation (O2Q)
01:44
7. Obligatory Opening Quotation (O2Q) - 2
00:13
8. Format
00:52
9. Caution
02:28
10. Tableting (Am. spelling)
02:38
11. Plastic flow or brittle fracture?
00:28
12. Plastic flow or brittle fracture?
01:44
13. Dry/direct compaction
00:33
14. Dry/direct compaction - disadvantages
00:40
15. Factors influencing dispersion rheology
00:48
16. Particle size
01:30
17. Effect of particle size on viscosity
00:51
18. Particle size distributions
01:14
19. Particle size distribution
00:38
20. Effect of particle size distribution on viscosity
00:56
21. Effect of particle shape on viscosity
00:05
22. Effect of particle shape on viscosityShear thinning
00:48
23. Effect of particle size on tablet strength*
00:41
24. Key factors: particle size and shape
00:58
25. Ideal material
01:33
26. Effects of physical properties for starch acetate powders on tableting*
00:28
27. Ceramics
00:23
28. Ceramics – the challenge
01:07
29. Strength of materials
01:17
30. Propagation of cracks
00:05
31. Propagation of cracks – after Somasundaran
01:13
32. Useful paper
01:38
33. This leads to the comminution limit (CL)
01:23
34. And a slide I’ve used a lot…based on Kevin Kendall
00:48
35. And why are cracks important?
00:56
36. Agglomeration
00:35
37. Sintered metal components – powder metallurgy
00:05
38. Sintering time – Herring’s equation
00:05
39. Effect of shape
00:46
40. Effect of shape
00:46
41. Penrose tiling
00:43
42. Escher – my favorite (mathematical) artistAngels and Demons
00:27
43. The challenge
00:13
44. High strength materials
01:05
45. Pittcon 2014 & 2015 – a 3-D problemHow many candies in the jar? (10159 actually)
00:27
46. Important properties - particle size distribution
00:34
47. Adapted from PietschW Pietsch “Size enlargement by agglomeration” John Wiley & Sons (1999)
01:09
48. Pietsch (continued)
00:28
49. Dinger-Funk equation
00:57
50. Ideal particle size distribution – plotted on log-log paper
00:18
51. Here’s my D-F plots for the Mastersizer 3000
00:27
52. Packing density
01:03
53. More applications you may not have considered
00:52
54. First, some more theory
00:05
55. Kyrylyuk – Slide 26
00:39
56. Kyrylyuk – Slide 27
00:31
57. Kyrylyuk – Slide 34
00:20
58. Jean-Louis SalagerUniversidad de Los AndesMérida, Venezuela
00:57
59. Chapter by Piet Stroeven & Huan He
00:26
60. Asphalt/bitumen
00:24
61. References
00:57
62. References
00:43
63. Thank you!
00:53
64. Thank you for your attentionAny questions?
03:31
65. Contact Info
02:42