05 powder charzterization 1

05 powder charzterization 1 - Powder Characterization...

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Powder Characterization • Chemical and Phase Composition (bulk and surface) • Physical Characterization: Density Porosity urface Area Surface Area Particle Size Objectives Learn and understand: characterization techniques, physics behind the techniques, py q , interpret data, limits of methods, Be able to figure out how to characterize a powder sample by ourself and quantitatively interpret the results yourself and quantitatively interpret the results.
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haracterizing ceramic powders Characterizing ceramic powders 3 most important questions What is the chemical composition? What are the phases? What is the morphology? Morphology: specific surface area, particle size, particle size distribution
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Particle system characteristics
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Particle system characteristics continued
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Infos we seek are correlated with the wavelength and ergy of the electromagnetic spectrum energy of the electromagnetic spectrum Rule of thumb: wavelength should be shorter than or similar to the size of an object
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Analytical methods for powder characterization
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Sampling
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Sampling
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Sampling - spinning riffler
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Sampling is very important to answer the questions properly Is your sample a proper example for all the material?
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AMPLING SAMPLING Probably the most under-emphasized art of any physical or chemical part of any physical or chemical measurement. Th Ci d ll f ti l i “The Cinderella of particle size measurement” (Brian Scarlett, Univ. elft Holland) Delft, Holland) Chapter 1 of Terry Allen, Particle Size Measurement, 4th Edition, Chapman and Hall, 1993
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REPEATABILITY Same sample time and time again. Note that this can’t apply to a dry measurement as the same sample is never seen again by the laser beam
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REPRODUCIBILITY Another sample nother operator Another operator Another instrument. ..
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05 powder charzterization 1 - Powder Characterization...

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