Ceramics Flashcards
Ceramics can be defined as
inorganic, non-metallic materials
ceramics are typically [] with some [] phase
typically crystalline
with some glassy phase
Ceramics are formed with compounds such as:
Aluminium + oxygen
Calcium + oxygen
Silicon + nitrogen
What are some examples of ceramics?
Clay products - bricks,tiles
White wares - dinner ware, electrical porcelain
Glass - flat glass, glass fibres
Natural abrasives - for cutting
[] compressive strength
High
[] tensile strength
Low
[] toughness
Low
[] hardness
High
[] + [] insulation
Thermal + electrical
[] durability
Good
[] cost except for [] processes
Low cost
Thermal processes
Clays moulds in a [] state then []
In a plastic state
Then sintered
Clays are complex []
Hydrated aluminosilicates
What are some examples of clays (basically geotechnics)
Kaolinite
Montmorilonite
Feldspars
Quartz sand
Clays are rich in
Alumina, silica and water
What are the 6 types of clay minerals
Brick
Bentomite
Common
Fire
Fuller’s earth
Kaolin
Structure wetting or clay causes silicate layers to
Slide
In sintering ceramic powders typically have a size of
0.5-5μm
Clays are [] mixed with []
Minerals
Water
In liquid phase sintering, the glassy phase
Melts
In liquid phase sintering, liquid draws the solid together by [] flow, driven by [] pressure
Viscous flow
Capillary pressure
In liquid phase sintering, the liquid phase can cool to . . .
Glass or crystallise
What are the some engineering ceramics?
Silicon nitride
Silicon carbide
Zirconium oxide
What temp is sintering normally done at?
850-1650
