Lecture2

Lecture2 - ENGR166 Foundations of Engineering Instructor...

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ENGR166 Foundations of Engineering Required text “Materials In Today’s World” Peter A. Thrower, Jr., 2nd edition, McGraw-Hill Companies, Inc (1996) Instructor Dr. Daniel Goberman daniel.goberman@uconn.edu 486-5478 Office: UTEB. Rm 266 Class Web Site http://www.ims.uconn.edu/~goberman/ENGR166/index.html
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Announcement Materials Advantage Club Pizza Dinner/Welcome Meeting Where: IMS Room 159 When: Monday Jan 28. 5:00pm
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Structure of Materials Five levels of structure: electronic structure, atomic structure, crystal structure, microstructure and macrostructure Bonding between atoms (electronic & atomic structure) determines structure at higher levels (crystal, micro- and macro-structure) Structure & defects in structure ultimately determine material properties Outline: Types of bonding (Ch. 5) Crystal structures, non-crystallinity (Ch. 6 & 7) Defects in crystals (Ch. 8)
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Structure and Carbon Two common forms of C - Diamond – transparent, colorless (without impurities), crystalline material that is very hard. Good thermal, bad electrical conductivity. Graphite – opaque, black, crystalline material which is soft and slippery (stiff in one plane). Good thermal AND electrical conductivity. Same atomic composition – C atoms Different electronic structure and thus different crystal structure 1 2
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Structure and Carbon Diamond Crystal Structure 3 Diamond Electronic Structure All four valence electrons are used to bond with other C atoms…strong 3D bonding electron
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Structure and Carbon Graphite Electronic Structure Only three valence electrons form bonds with other C atoms in layer planes, the forth can move freely about between layer planes… Graphite Crystal Structure 4 Layer planes are weakly bonded and can slide over one another… - ‘dry’ lubricant - pencil
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Structure and Carbon Other Forms of Carbon: 5. Soot 6. Carbon Fiber Helmet 7. Carbon Fiber 8. Activated Carbon Activated Carbon – porous, granular form of carbon.
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Lecture2 - ENGR166 Foundations of Engineering Instructor...

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