Clay Flashcards
What are the properties of Clay?
High plasticity/ductility Cohesive High strength in compression, low strength in tension Opaque Insulating Can be chemically transformed to ceramic
What is the composition/chemistry of clay?
Al, Si, O, and water
Why is Clay ductile?
It is ductile because of the weak bonding between its plates or water layers.
Kaolinite
Low shrink-swell capacity
Used in stoneware, pottery, cosmetics
1:1 ration of tetrahedra: Octahedra layers
Montmorillonite
High shrink-swell capacity
Used in cat litter, cores of dams,
2:1 ration of tetrahedra: Octahedra layers
What is the source
Mined in the earth
What Precisely are rare earth elements? What are some of their enabling properties
Elements that exhibit chemical properties like catalysts for reactions, magnetic properties, luminescence.
What are some the important everyday examples of consumer items using rare earth elements?
Plasma Televisions, Cellphones, Washer/Dryer
How would you explain the scarcity of rare earth elements? Are they actually ‘rare’?
They are not actually rare, but they are scattered in tiny amounts.
What is paste?
Clay and Temper.
What does temper do for clay
It minimizes shrinking and cracking when dry
What is special about Jericho
It is one of oldest city in world
Crops were cultivated in stored in clay
Early uses of clay
Construction, pottery, Writing materials, Sling Ammunition, Cooking materials
Modern Uses
Oil Drilling wells (montmorillonite clay)
Pottery(Kaolinite)
Building Materials (Montmorillonite)
Fertilizer
What are some examples of factors of a material that engineers must consider
Availability, disposal, acceptability, Regulation
