The Learn Tracker
...life-long learning: structured, organized, searchable...
924
Lectures Watched
Since January 1, 2014
Hundreds of free, self-paced university courses available:
my recommendations here
Peruse my collection of 275
influential people of the past.
View My Class Notes via:
Receive My Class Notes via E-Mail:

VIEW ARCHIVE

Contact Me via E-Mail:
edward [at] tanguay.info
Notes on video lecture:
The Six Categories of Engineering Materials
Notes taken by Edward Tanguay on January 8, 2016 (go to class or lectures)
Choose from these words to fill the blanks below:
sheathing, silicate, conductivity, Coulombic, light, mobile, ionic, control, luster, engineering, adjacent, oxygen, sharing, submicroscopic, hydrogen, ceramic, plastic, cations, spoken, ductility, six
•
six categories of                        materials
•
nearly all materials used for modern applications come from these        categories
•
1. metals
•
metallic bond
•
                 atoms share electrons in a non-directional way
•
metal pan
•
can't see through it
•
electrons that provide the metallic bonding are reflecting any proton light rays from the environment
•
gives us the characteristic shiny             
•
can conduct electricity, since bonding electrons are             
•
power cord
•
metal is providing the                         
•
polymer                    that is providing the safety and insulation
•
2. polymers
•
covalent bond
•
directional bond
•
electron sharing between adjacent atoms
•
have a stable balance
•
               spatula
•
good structural integrity
•
convenient
•
          -weight
•
carbon-to-                 bonding
•
covalent
•
electrons are being shared by the two adjacent atoms
•
electrons are thus spoken for, good insulator
•
3. ceramics
•
           bond
•
non-directional bond
•
electron                from one atom to another
•
involves the electrostatic attraction between oppositely charged ions
•
atoms that have lost one or more electrons (known as               ) and atoms that have gained one or more electrons (known as anions)
•
from a metallic cation to a negative anion, very often             
•
                   forces
•
the magnitude of the electrostatic force of interaction between two point charges is directly proportional to the scalar multiplication of the magnitudes of charges and inversely proportional to the square of the distance between them
•
common ceramic coffee mug
•
electrons are              for, therefore electrical insulating
•
first three categories are based on the three different kind of electron bonding: metallic, covalent, and ionic
•
4. glass
•
a subset of ceramics
•
the key distinction between the                and glass
•
glass: random atomic arrangement of ions
•
ceramic: crystalline formation
•
common drinking glass
•
optically transparent
•
because of the nature of the ionic bonding
•
silicon ions and oxygen ions, a common                  material
•
5. fiberglass
•
best of both worlds
•
the                    of a polymer
•
ductility: when a solid material stretches under tensile stress
•
like the plastic spatula
•
harder structure
•
from microscopic glass fibers
•
a few microns in diameter
•
stacking chairs
•
fiberglass
•
6. semiconductors
•
small piece of silicon
•
microscopic and                             
•
can                the conductivity in a very powerful way

Spelling Corrections:

sillicate ⇒ silicate

Flashcards:

polymers have what kind of bond
covalent
ceramics have what kind of bond
ionic
glass is a subset of what
ceramics
what is the key distinction between the ceramic and glass
glass has random atomic arrangement, ceramic has crystalline formation
The Six Categories of Engineering Materials
Dislocations Explain Plastic Deformation