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Materials > Atomic Strusture And Thermal Properties > Flashcards

Atomic Strusture And Thermal Properties Flashcards

1
Q

What is specific heat capacity?

A

C is Q/(m deltaT)

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2
Q

What is the linear coefficient of thermal expansion?

A

Strain = linear coefficient of thermal expansion times deltaT

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3
Q

What is Fourier’s law?

A

Heat flux (q) = -k times temp gradient

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4
Q

What is thermal shock resistance?

A

TSR is proportional to (stress times k)/(E times linear coefficient of thermal expansion)

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5
Q

What are Valence electrons?

A

Outer shell electrons that determine the properties of the element

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6
Q

List the primary bonds and there benefits

A

Ionic, Covalent, Metallic. Provide high strength

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7
Q

What is ionic bonding?

A

Metal-Non metal, metal donates electron

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8
Q

What is covalent bonding?

A

Non metal- Non metal, share electrons

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9
Q

What is metallic bonding?

A

Metal-Metal, Valence electrons act as a dislocated sea of electrons

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10
Q

List the secondary bonds

A

Van der Waals, Hydrogen

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11
Q

What is Van der Waals bonding?

A

Attraction between opposite partial charges of neighbouring induced dipoles

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12
Q

What is hydrogen Bonding?

A

Interaction between hydrogen atoms and highly electronegative atoms (strong dipole-dipole attractions)

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13
Q

What is a unit cell?

A

Smallest repetitive volume which contains the complete lattice pattern of a crystal

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14
Q

What’s the equation for to find ‘a’ for a SC structure?

A

a=2r

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15
Q

What is the equation to find ‘a’ for a BCC structure?

A

a=4r/ root3

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16
Q

What is the equation to find ‘a’ for a FCC structure?

A

a=4r/ root2

17
Q

What is the ideal c/a ratio?

A

1.633

18
Q

Atomic packing factor

A

Volume of atoms in unit cell/ volume of unit cell

19
Q

Density

A

nA/((Vc)(Na))

20
Q

List the point defects

A

Vacancy atoms, interstitial atoms, substitutional atoms

21
Q

What is vacancy atoms?

A

Atoms is missing in the lattice, causes distortion of planes

22
Q

What is interstitial atoms?

A

Extra atom in the lattice, causes distortion of planes

23
Q

What is substitutional atom?

A

Atoms in place of other atoms

24
Q

List the line defects

A

Dislocations

25
Q

What are dislocations?

A

Breaking of chemical bonds, changing the place of atoms, causes permanent plastic deformation

26
Q

What are area defects

A

Grain boundaries

Materials (6 decks)

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