03 powder synthesis1for web

03 powder synthesis1for web - EMA 6448 Chapter 2 Powder...

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Powder Synthesis EMA 6448 Chapter 2 Objectives Student should be able to answer the following questions: What is special about powder synthesis for ceramics? What routes of powder synthesis are available? What powder preparation methods are available? What particle size can be reached with each method? What purity can be obtained?
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Definitions Particle A small, discrete unit of solid matter that can be isolated from other similar units; they may be primary particles or solid agglomerates Primary, or Dense, Particle A discrete unit; single crystal; smallest building unit for a particle system. Density is close to theoretical density.
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Agglomerate Small mass having a network of connective pores, composed of primary particles Aggregate (or Hard Agglomerate) Primary particles are bonded together by strong chemical bonds, formed by sintering, fusion, or chemical reaction, difficult to break except by severe mechanical means. Soft or Weak Agglomerate Primary particles are bonded together by “weak” surface forces from van der Waals, capillary forces or electrostatic forces. Easier to separate into primary particles.
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Aldinger, MPI Stuttgart
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Granule Intentionally formed large agglomerate with defined surface forces through control of interfacial chemistry/physics (organic binder, etc…) in order to promote formation of free flowing powder.
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Monomodal Powders via Sol-Gel-Processing a) SEM-Picture of BaTiO 3 b) TEM-Picture of Pb 2 Nb 2 O 7 Source: Gauckler, ETH Zuerich
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Nanopowders Particle size: ~hundred nm 3M YSZ powder Tosoh YSZ powder
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03 powder synthesis1for web - EMA 6448 Chapter 2 Powder...

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