True or false. thermoplastic have some ductility.
true
True or false. thermosets have some ductiltiy
false
Ture or false. Materials with the exact same composition will have the same properties, even if the processing steps to produce them are different.
false
Is a Zn a cermaic
NO
What material has compounds made up of both metallic and non-metallic elements like tungsten carbide.
ceramic
What is not a characteristic for ceramic?
good ductility and formability
What material has the highest density?
metals
What material has the highest stiffness?
ceramics
Which material is the best for high temperature applications?
ceramics
True or false. do metals have some ductility
true
True or false. do ceramics have some ductility
false
True or false. do elastomers have some ductility
true
Which is a polymer? silicon, silica, or silicone
silicone
What polymer softens repeatably on heating?
thermoplastic polymers
What polymer type is the easiest to recycle
thermoplastic polymers
True or false. syntactic foams are polymer matrix composites reinforced with hollow spheres
true
true or false. aggregates make concrete more expensive
false
Will a greater or smaller fraction of reinforcing fibers increase strength in fiber reinforced composites.
greater fraction
Will fibers parallel or perpendicular to the applied load have the highest strength?
parallel
Will shorter/fatter or longer/thinner fibers increase the strength in fiber reinforced composites?
long/thin fibers
Would a linear or branched thermoplastic have a higher strength if all other aspects are the same?
branched
Would a thermoplastic with a higher or lower average atomic weight have a higher strength?
higher average atomic weight
Would a thermoplastic with a higher or lower degree of crystallinity have a higher strength?
high degree
Would a thermoplastic with complex or simple side groups have a higher strength?
complex side groups
Would an elastomer with a low or high number of crosslinks have a higher strength?
high number of crosslinks
Which polymer has the most primary bonds?
thermoset
Which would have a higher strength, a ceramic with high or low porosity level?
lower porosity
Which would have a higher strength, a ceramic with a smaller or larger grain size?
small grain size
What is the toughest ceramic?
zirconia (ZrO2)
True or false. silica is a network former in glass.
true
True or false. most steel is produced by sand casting
false.
Continuous casting
What type of cast iron will be the hardest?
white iron
Which type of cast iron conducts heat the best?
gray iron
Which type of cast iron has the best machinability?
gray iron
By weight, the most used metal alloy is...
iron/steel
True or false. carbon steels are more expensive than alloy steels.
false
True or false. BBC steel is magnetic
true
True or false. aluminum has a lower density than steel
true
True or false. aluminum has a higher stiffness than steel
false
Ture or false. it takes less energy to make aluminum from ore than it takes to make iron from ore.
falseee
True or false. With the exception of silver, copper is a metal with the highest conductivity.
true
True or false. A glaze helps stop staining of ceramics.
true
True or false. Vitrification is the partial melting of a ceramic during sintering that, when cooked, forms a glass.
true
True or false. Vitrification reduces the strength of cermaics
false
True or false. Transformation toughened zirconia is tough because it is very hard.
false
What material is used the most (by weight)?
Cement and concrete
True or false. The most advanced ceramics are melted to form their parts.
false
What is not true for a glazed ceramic?
the glaze closes up pores in the interior of the part
True or false. Glasses are shiny because they are crystalline.
false
True or false. Tempered glass is stronger than glass that is not tempered.
true
True or false. The density of steel is significantly lower than that of aluminum.
false
How much carbon is in a 1045 steel?
.45 wt%
What element makes steel stainless?
chromium
True or false. The recycling of metal reduces its cost.
true
What is the most commonly used element in polymers?
carbon
Do you expect the strength of polymers to increase or decrease after thermoplastic polymer fibers are pulled plastically to lengthen the fibers?
increase
True or false. By weight, does the usage of thermoset polymers exceeds that of thermoplastic polymers?
false
What method is the most common processing method for plastic production?
injection molding
The difference between a compostite and an alloy is what?
Composites are materials made up of two components that retain their original character.
True or false. the bonding between matrix and reinforcing phases in fiber reinforced polymer composites affects ductility.
true
What is true for a dispersion strengthened composite composite but not for a precipitation-hardened metal alloy.
composites can operate at higher temperatures
What is the most common matrix for fiber reinforced composites?
thermosetting polymer
There is a limit to the amount of fiber reinforced tat can be added to a fiber-reinforced polymer because...
the fibers need to be fully coated with the martix to achieve optiumum properties
Which fiber type is stronger but not as stiff?
kevlar fiber
True or false. bag molding of composites gives better properties than simple hand lay-ups.
true
True or false. a thermoset matrix in a fiber reinforced composite is easier to process.
false
What is not a typical property of a metal?
poor conductor of heat
What has more carbon, steel or cast iron?
cast iron
True or false. the corrosion rate of metals increases at increased temperatures.
true
True or false. the corrosion rate of metals decreases when the metal is under stress.
false
What element makes stainless steel corrosion resistance?
chromium
True or false. window glass is made by flat rolling.
false
The glass is floated on molten tin
What material types can degrade in sunlight?
polymers??