Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Materials > Ceramics > Flashcards

Ceramics Flashcards

1
Q

Ceramics can be defined as

A

inorganic, non-metallic materials

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

ceramics are typically [] with some [] phase

A

typically crystalline

with some glassy phase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Ceramics are formed with compounds such as:

A

Aluminium + oxygen
Calcium + oxygen
Silicon + nitrogen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are some examples of ceramics?

A

Clay products - bricks,tiles

White wares - dinner ware, electrical porcelain

Glass - flat glass, glass fibres

Natural abrasives - for cutting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

[] compressive strength

A

High

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

[] tensile strength

A

Low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

[] toughness

A

Low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

[] hardness

A

High

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

[] + [] insulation

A

Thermal + electrical

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

[] durability

A

Good

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

[] cost except for [] processes

A

Low cost

Thermal processes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Clays moulds in a [] state then []

A

In a plastic state

Then sintered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Clays are complex []

A

Hydrated aluminosilicates

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are some examples of clays (basically geotechnics)

A

Kaolinite
Montmorilonite
Feldspars
Quartz sand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Clays are rich in

A

Alumina, silica and water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What are the 6 types of clay minerals

A

Brick
Bentomite
Common
Fire
Fuller’s earth
Kaolin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Structure wetting or clay causes silicate layers to

A

Slide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

In sintering ceramic powders typically have a size of

A

0.5-5μm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Clays are [] mixed with []

A

Minerals
Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

In liquid phase sintering, the glassy phase

A

Melts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

In liquid phase sintering, liquid draws the solid together by [] flow, driven by [] pressure

A

Viscous flow

Capillary pressure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

In liquid phase sintering, the liquid phase can cool to . . .

A

Glass or crystallise

23
Q

What are the some engineering ceramics?

A

Silicon nitride
Silicon carbide
Zirconium oxide

24
Q

What temp is sintering normally done at?

A

850-1650

25
Q

What happens to applied stress at tips of flaws in a ceramic?

A

Amplified

26
Q

Which equations describes the tensile fracture stress of a ceramic

A

Griffith’s equation

27
Q

What is involved in the first step of ceramic processing?

A

Slurry formation

Moisture optimisation

Spray drying

28
Q

What is the effect of spray drying?

A

Dries ceramic slurry into spherical particles

29
Q

What are the three choices in step two of ceramic processing? (shaping)

A

Powder processing

Extrusion

Slip casting

30
Q

What happens in powder processing?

A

Powder poured into mould

Mould is pressed

31
Q

What happens in extrusion?

A

Dried slurry particles pushed through a small hole to bind them closer together

( like a toothpaste tube)

32
Q

What happens in slip casting?

A

Water flows through particles, their mass draws the particles together

33
Q

What is the third step of ceramic processing?

A

Drying

34
Q

What is the final part of ceramic processing?

A

Sintering

35
Q

The ceramic microstructure consists of

A

Crystalline phases
Amorphous (glassy) phase
Porosity

36
Q

What is meant by amorphous?

A

Irregular, lacking a clearly defined form

37
Q

Dislocations in ceramics are responsible for

A

Ductility

38
Q

Pores/ surface flaws concentrate what?

A

Stress

39
Q

Stress concentrating flaws are called

A

Griffith’s flaws

40
Q

Ceramics are [] materials

This gives them inherent [] durability

A

Oxidised materials

Chemical durability

41
Q

Which process is used for the mass production of disc shaped ceramic products?

A

Uni-axial pressing

42
Q

Why are the four steps for uni-axial pressing?

A

Pouring
Pressing
Ejection
Repetition

43
Q

Briefly describe slip casting of ceramics

A

Slip/slurry poured into mould

Excess water is extracted through porous calcium silicate/gypsum mould

Finished piece is sintered

44
Q

Before powder processing, the ceramic micro structure is

A

A granular powder

45
Q

After powder processing, the ceramic micro structure is

A

A compacted green body

46
Q

After sintering , the ceramic micro structure is

A

A ceramic component

With grains sticking together

47
Q

What is adobe?

A

Unrefined ceramic

Sun dried mud blocks

An ancient and popular material

48
Q

What are the three main steps to brick production?

A

Clay is crushed and extruded

Cut by wires

Dried in a kiln

49
Q

How do sintered products compare to chemically bonded materials

A

Inherently stronger

50
Q

For what reasons might bricks fall apart?

A

Water absorption

Repeated freeze thaw cycles

Surfaces suffer from flaking/ spalling

Mortars joints crumble due to frost failure

51
Q

What is efflorescence of bricks?

A

The appearance of salts deposited on the surface of bricks that were dissolved in wet working conditions appear once dry

52
Q

What is the iron staining of bricks?

A

Similar to efflorescence, only it is iron oxides that leech out instead of soluble salts

Due to saturation of immature bricks

53
Q

Explain lime staining

A

Occurs when work is left uncovered and exposed to rain

Materials (13 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions