ch3.2-S10 - Chapter 3: Structure of Metals and Ceramics...

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MY2100 – Ch 3, Part 2, Slide 1 Chapter 3: Structure of Metals and Ceramics structure processing properties Performance Now: Look at ceramic structures as well as polycrystals and non-crystalline solids
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MY2100 – Ch 3, Part 2, Slide 2 ISSUES TO ADDRESS. .. How do the structures of ceramic materials differ from those of metals? What is a polycrystalline material? What structure, if any, exists in a noncrystalline solid?
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MY2100 – Ch 3, Part 2, Slide 3 3 Quick Review - ceramic bonding SiC: small CaF 2 : large Bonding: --Mostly ionic, some covalent. This usually means at least 2 elements must be present. --% ionic character increases with difference in electronegativity. Large vs small ionic bond character: Table of Electronegativites
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MY2100 – Ch 3, Part 2, Slide 4 15 Charge Neutrality : --Net charge in the structure has to be zero. --General form: A m X p m, p determined by charge neutrality Stable structure : depends on size ratio of ions . --maximize the # of nearest oppositely charged neighbors . - + unstable - + stable - + stable CaF 2 : Ca 2+ cation F - anions + Ionic bonding & ceramic structures - 2 key issues
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This note was uploaded on 03/16/2011 for the course MY 2100 taught by Professor Staff during the Spring '08 term at Michigan Technological University.

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ch3.2-S10 - Chapter 3: Structure of Metals and Ceramics...

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