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Aerospace Engineering-mat > Glass > Flashcards

Glass Flashcards

1
Q

Structure of Glass

A

Amorphous

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2
Q

Is Glass in a meta-stable state?

A

Yes

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3
Q

What is Glass commonly made out of

A

Silicates

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4
Q

Properties of Glass (mechanical) (3)

A

Hard, Brittle, Perfectly elecastic

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5
Q

What does perfectly elastic mean

A

There is little or no plastic deformation

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6
Q

Glass Properties(Density)

A

Polymers- higher

metals- lower

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7
Q

Glass (compressive strength)

A

Surprisingly high

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8
Q

Tensile stregth

A

not great but stronger for anealed

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9
Q

Youngs modulus

A

medium

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10
Q

Thermal expansion

A

low

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11
Q

Why can you see through glass

A

Energy levels wide enough that visible light is not absorbed

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12
Q

Why is sio2 forming crystals when cooling bad?

A

because then its less see through

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13
Q

What effect do impurities have in glass

A

Make less transparent but nice colours

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14
Q

Why do we sometimes add impurities to glass

A

to disrupt the crystal order

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15
Q

How do we make sure glass is amorphous?

A

Impurities and Quenching(cooling really fast)

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16
Q

Why use a glass former

A

It readily forms an amorphous structure

17
Q

Why use a modifier?

A

it encourages an amorphous structure

18
Q

Why use a intermediates

A

used with modifiers to form a glass

19
Q

Glass manufacture- pressing

A

Pressing hot glass into shape

20
Q

Glass manufacture- Press and blow

A

pressing into shape and then blowing to expand shape

21
Q

Glass Manufacture- Drawing

A

Get strings of the glass and they cool

22
Q

GLass manufacture- rolling

A

Roll out then anneal

23
Q

Glass manufacuture- floating on molten tin

A

helps keep it flat and cools quick

24
Q

Glass tempering

A

Heat between softening and melting point then quickly cool to reduce stress

25
Q

What is a glass ceramic?

A

Recrystalysed glass

26
Q

Why are glass cermanics so good(2)

A

strong and low thermal expansion

27
Q

How do you recrystalisze glass?

A

By heating it up so nucleation and crystals can grow

Aerospace Engineering-mat (8 decks)

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