1a1.introduction to atomic bonding
TRANSCRIPT
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INTRODUCTION
AND
ATOMIC BONDING
• Introduction• Atomic Structure• Atomic Bonding
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ISSUES TO ADDRESS...
• What promotes bonding?
• What types of bonds are there?
• What properties are inferred from bonding?
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• What is materials science?
– Relationship between structures and
properties of materials.
What is materials engineering?
Structures – properties correlations
Design the structure of material to impart
desired properties
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Example – Hip Implant• With age or certain illnesses joints deteriorate.
Particularly those with large loads (such as hip).
Adapted from Fig. 22.25, Callister 7e.
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Example – Hip Implant
• Requirements
– mechanical
strength (many
cycles)
– good lubricity
– biocompatibility
Adapted from Fig. 22.24, Callister 7e.
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Example – Hip Implant
Adapted from Fig. 22.26, Callister 7e.
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Hip Implant
• Key problems to overcome
– fixation agent to hold
acetabular cup
– cup lubrication material
– femoral stem – fixing agent
(“glue”)
– must avoid any debris in cup
Adapted from chapter-opening
photograph, Chapter 22, Callister 7e.
Femoral
Stem
Ball
Acetabular
Cup and Liner
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The Periodic Table• Columns: Similar Valence Structure
Adapted from
Fig. 2.6,
Callister 7e.
Electropositive elements:
Readily give up electrons
to become + ions.
Electronegative elements:
Readily acquire electrons
to become - ions.
giv
e u
p 1
eg
ive u
p 2
eg
ive u
p 3
e
inert
gases
accep
t 1e
accep
t 2e
O
Se
Te
Po At
I
Br
He
Ne
Ar
Kr
Xe
Rn
F
ClS
Li Be
H
Na Mg
BaCs
RaFr
CaK Sc
SrRb Y
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