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Lecture 5

MSE 2010 Lecture Notes - Lecture 5: Cassiterite, Rubber Band, Stone Age

4 pages77 viewsFall 2016

Materials Science and Engineering
Course Code
MSE 2010

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MSE 2010
29 August 2016
EarlyMan-F16-slides 11-35
if there is metal inside of the rock, then it is called an ore. it is first used for decoration then
for iron
stone age = all about survival, no sleep
obsidian, exactly like window glass ( nature’s window glass). A lot of impurities. they come
out of volcanoes, thus found far from origin.
Flint has a periodic atomic structure. Colours change because of impurities
fire —> flint + iron . Found iron later so it took time
you get iron from the ore by…
Ocean cools the lava from the volcano really quickly to make obsidian
we have shitload of Oxygen, second most Silica.
many rocks are oxides, Oxygen attacks metals a lot.
far right in periodic table = noble elements
deeper you go, hotter it gets because of radioactivity
surface reflects what is going on internally
long range order = perfect hexagons = crystalline = periodic atomic structure
flint has long range order but obsidian does not, thus obsidian is not a crystalline. Both have
short range order tho
obsidian wants to look like flint/crystalline (lacks the systematic arrangement) but can’t
because of cooling in water
systematic structure (hexagons) =flint not hexagons = obsidian SINAVD SORUSU(S25)
pulling = stress & stretching = stress
harder the stretch, stronger is the rubber band
stone and wood stretch linearly up to a point
stiffness, steel and iron has very good stiffness but not wood. sallayinca sallaniyor dup
MSE 2010
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