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Aerospace Engineering-mat > Ceramics > Flashcards

Ceramics Flashcards

1
Q

Two types of ceramics

A

Technical and non technical

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2
Q

Structure of Ceramic

A

Crystalline

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3
Q

Cermanics- Ductility

A

no brittle, high moduli

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4
Q

Ceramics- Strength

A

Strong in tension

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5
Q

Ceramics- how easy is manufacture

A

Difficult to design and shape as cannot melt and flow

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6
Q

What is Porosity

A

Holes in the crystal stucture left behind by evaporating water

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7
Q

When more porosity what happens to strength (E, Flexural strength)

A

it decreases with volume fraction Porosity

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8
Q

Measuring porosity- what is wd

A

dry weight

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9
Q

Measuring Porosity- what is ws

A

weight when suspended in water

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10
Q

Measuring Porosity- what is Ww

A

weight when removed from water

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11
Q

Measuring Porosity- Equation

A

ww-wd/ww-ws *100

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12
Q

Apparent porosity- cons

A

doesn’t include the central pores that water cant get into

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13
Q

True porosity- pros and cons

A

better then apparent, hard to find B

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14
Q

Cermanics - mechanical properties (strength)

A

Higher compressive strength then glass, highest tensile strength

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15
Q

Cermanics- price

A

non technical cheap- technical not cheap

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16
Q

Ceramics- Thermal and electrical conductivity

A

big range for both

17
Q

Manufacturing ceramics step 1

A

combine slurry and water

18
Q

Manufacturing ceramics step 2 and 3

A

shape and heat to get rid of water

19
Q

Cons of manufacturing ceramics by hand

A

leaves micropores

20
Q

What would happen to a ceramic with micropores in freezing conditions

A

cracks would propogate as water exapand

21
Q

How to fix internal pores through manufacture

A

Coat in ash and then it will penetrate it and then form a glass inside- porcelain

22
Q

Modern ceramic manufacturing

A

Uses powder- shape- then sinter

23
Q

What is sintering

A

High temp allows movement of atom at grain boundaries

24
Q

Powder pressing describe

A

compact powder into mould and then compress

25
Q

Slip casting

A

Slip is water and ceramic- creates hollow thing as it can let the water through the mould

26
Q

Tape casting

A

Produces flexible films- like pasta- conveyer belt- heat

27
Q

Are ceramics chemically inert

A

yes

Aerospace Engineering-mat (8 decks)

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