Pore Morphography in Ceramic Processing
Most ceramics while being processed begin as an aggregation of particles and of pores. During processing the size and distribution of pores change. Some factors affecting pore size distribution (PSD) during processing are the particle size distribution, forming pressure, the volatilization of temporary binders and plasticizers, decomposition, and sintering. After processing many ceramics are porous and their PSDs can affect the properties in use. Mercury intrusion has been found to be the most useful method of characterizing PSD of porous ceramics. The method was first proposed by Washburn in 1921,1 but not until 1945 did Ritter and Drake report applications. 2 Since then many investigators have used the method to characterize porous materials. 4,5 This paper will describe several applications of mercury porosimetry for the characterization of ceramics at various stages of processing.
KeywordsPore Size Distribution Pore Diameter Silicon Nitride Mercury Porosimetry Glass Sphere
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