Texas MMET 201 Assessment 2 Rated A+
Ceramics - ANS-compounds of metallic and nonmetallic elements
Categories of Ceramics - ANS-Traditional and Industrial Ceramics
Traditional Ceramics - ANS-Such as whiteware, tiles, bricks, sewer pipe, pottery,
and abrasive wheels
Industrial Ceramics (Engineering/High-tech/Fine Ceramics) - ANS-Turbine,
automotive, and aerospace components; heat exchangers, semiconductors; seals;
prosthetics; and cutting tools
Structure of Ceramics - ANS--The structure of ceramic crystals is among the most
complex of material structures.
-The bonding between these atoms is generally covalent (strong bonds) or ionic
-Hardness and Thermal Resistance are significantly higher in ceramics than in
metals.
-Grain size has major influence on the size and strength of properties of ceramics;
the finer the grain size, the higher the strength and toughness.
Raw materials - ANS-clay, flint. feldspar
Clay - ANS-has a fine-grained sheet-like structure
Flint - ANS-a rock composed of very fine grained silica. SiO2
Feldspar - ANS-A group of crystalline minerals consisting of aluminum silicates plus
potassium, calcium, or sodium
Types of oxide ceramics - ANS-Alumina (AL2O3). Zirconia( Zirconium oxide, ZrO2)
Alumina (AL2O3) - ANS--Called corundum or emery, is the most widely used oxide
ceramic
-Used in thermal and electrical insulators, cutting tools and abrasives
Zirconia (Zirconium oxide, ZrO2) - ANS--White in color, has good toughness; good
resistance to thermal shock, wear and corrosion; low thermal conductivity; and a
low friction coefficient
-Used in fake teeth
,Carbides - ANS-Typical carbides are those made of tungsten and titanium (used as
cutting tools and die material) and of silicon (used as an abrasive, especially in
grinding wheels)
Tungsten carbide (WC) - ANS-Consist of tungsten-carbide particles with cobalt as a
binder
Titanium carbide (TiC) - ANS-has nickel and molybdenum as the binder and is not
as tough as tungsten carbide.
Silicon carbide (SiC) - ANS--Has good resistance to wear, thermal shock, and
corrosion
-Retains strength at elevated temperatures so it is used in heat engines and as an
abrasive.
Nitrides - ANS-CBN
TiN
Silicon Nitride
cubic boron nitride (CBN) - ANS--The second hardest known substance (after
diamond)
-Cutting Tools and abrasives in grinding wheels
Titanium nitride (TiN) - ANS-used as a coating on cutting tools; it improves tool life
Silicon nitride (Si3N4) - ANS--Has high resistance to creep at elevated
temperatures
-Low thermal expansion, high thermal conductivity, and resist thermal shock
-Automotive engine, gas turbine components, bearings, sand blast nozzles.
Silica - ANS--Most glasses contains more than 50% silica
-The most common form of silica is quartz
-Silicates are products of the reaction of silica with oxides of aluminum,
magnesium, calcium, potassium, sodium and iron
Alumina - ANS-High hardness and moderate strength; most widely used ceramic;
cutting tools; abrasives; electrical and thermal insulation
Zirconia - ANS-High strength and toughness; thermal expansion close to cast iron;
suitable for high temperature application such as metallurgical furnace lining, jet
engine components, and nuclear fuel cladding
Tungsten carbide - ANS-Hardness, strength, and wear resistance depend on cobalt
, content; commonly used for cutting tools
Titanium carbide - ANS-Not as tough as tungsten carbide; has nickel and
molybdenum as the binder; used as cutting tools
Silicon carbide - ANS-High temperature strength and wear resistance; used for heat
engines and as abrasives in grinding wheels
Cubic Boron Nitride - ANS-Second hardest substance known, after diamonds; used
as abrasives and cutting tool
Titanium nitride - ANS-Gold in color' used as coatings because of low frictional
characteristics
Silicon nitride - ANS-High resistance to creep and thermal shock; used in high
temperature applications such as turbocharger components, rolling element
bearings and cutting tools
Sialon - ANS-Consist of silicon nitrides and other oxides and carbides; used as
cutting tools and feed tubes and linings for non ferrous metal casting
Properties of Ceramics - ANS-- High strength and hardness at elevated
temperatures
-High elastic modulus
-Low toughness, density, thermal expansion, thermal and electrical conductivity
Properties of Ceramics - ANS-- Lack impact toughness and thermal shock resistance
and lack of ductility
-Ceramics exhibit a phenomenon called static fatigue; when subjected to a static
tensile load over a period of time, these materials suddenly may fail
-This phenomenon occurs in environment where water is present
Ceramics Applications - ANS--Electrical and electronics industries
-Automobiles
-Gas turbine engine
-Coating metal
-Turbochargers
-Cylinder liners
Ceramics - ANS-compounds of metallic and nonmetallic elements
Categories of Ceramics - ANS-Traditional and Industrial Ceramics
Traditional Ceramics - ANS-Such as whiteware, tiles, bricks, sewer pipe, pottery,
and abrasive wheels
Industrial Ceramics (Engineering/High-tech/Fine Ceramics) - ANS-Turbine,
automotive, and aerospace components; heat exchangers, semiconductors; seals;
prosthetics; and cutting tools
Structure of Ceramics - ANS--The structure of ceramic crystals is among the most
complex of material structures.
-The bonding between these atoms is generally covalent (strong bonds) or ionic
-Hardness and Thermal Resistance are significantly higher in ceramics than in
metals.
-Grain size has major influence on the size and strength of properties of ceramics;
the finer the grain size, the higher the strength and toughness.
Raw materials - ANS-clay, flint. feldspar
Clay - ANS-has a fine-grained sheet-like structure
Flint - ANS-a rock composed of very fine grained silica. SiO2
Feldspar - ANS-A group of crystalline minerals consisting of aluminum silicates plus
potassium, calcium, or sodium
Types of oxide ceramics - ANS-Alumina (AL2O3). Zirconia( Zirconium oxide, ZrO2)
Alumina (AL2O3) - ANS--Called corundum or emery, is the most widely used oxide
ceramic
-Used in thermal and electrical insulators, cutting tools and abrasives
Zirconia (Zirconium oxide, ZrO2) - ANS--White in color, has good toughness; good
resistance to thermal shock, wear and corrosion; low thermal conductivity; and a
low friction coefficient
-Used in fake teeth
,Carbides - ANS-Typical carbides are those made of tungsten and titanium (used as
cutting tools and die material) and of silicon (used as an abrasive, especially in
grinding wheels)
Tungsten carbide (WC) - ANS-Consist of tungsten-carbide particles with cobalt as a
binder
Titanium carbide (TiC) - ANS-has nickel and molybdenum as the binder and is not
as tough as tungsten carbide.
Silicon carbide (SiC) - ANS--Has good resistance to wear, thermal shock, and
corrosion
-Retains strength at elevated temperatures so it is used in heat engines and as an
abrasive.
Nitrides - ANS-CBN
TiN
Silicon Nitride
cubic boron nitride (CBN) - ANS--The second hardest known substance (after
diamond)
-Cutting Tools and abrasives in grinding wheels
Titanium nitride (TiN) - ANS-used as a coating on cutting tools; it improves tool life
Silicon nitride (Si3N4) - ANS--Has high resistance to creep at elevated
temperatures
-Low thermal expansion, high thermal conductivity, and resist thermal shock
-Automotive engine, gas turbine components, bearings, sand blast nozzles.
Silica - ANS--Most glasses contains more than 50% silica
-The most common form of silica is quartz
-Silicates are products of the reaction of silica with oxides of aluminum,
magnesium, calcium, potassium, sodium and iron
Alumina - ANS-High hardness and moderate strength; most widely used ceramic;
cutting tools; abrasives; electrical and thermal insulation
Zirconia - ANS-High strength and toughness; thermal expansion close to cast iron;
suitable for high temperature application such as metallurgical furnace lining, jet
engine components, and nuclear fuel cladding
Tungsten carbide - ANS-Hardness, strength, and wear resistance depend on cobalt
, content; commonly used for cutting tools
Titanium carbide - ANS-Not as tough as tungsten carbide; has nickel and
molybdenum as the binder; used as cutting tools
Silicon carbide - ANS-High temperature strength and wear resistance; used for heat
engines and as abrasives in grinding wheels
Cubic Boron Nitride - ANS-Second hardest substance known, after diamonds; used
as abrasives and cutting tool
Titanium nitride - ANS-Gold in color' used as coatings because of low frictional
characteristics
Silicon nitride - ANS-High resistance to creep and thermal shock; used in high
temperature applications such as turbocharger components, rolling element
bearings and cutting tools
Sialon - ANS-Consist of silicon nitrides and other oxides and carbides; used as
cutting tools and feed tubes and linings for non ferrous metal casting
Properties of Ceramics - ANS-- High strength and hardness at elevated
temperatures
-High elastic modulus
-Low toughness, density, thermal expansion, thermal and electrical conductivity
Properties of Ceramics - ANS-- Lack impact toughness and thermal shock resistance
and lack of ductility
-Ceramics exhibit a phenomenon called static fatigue; when subjected to a static
tensile load over a period of time, these materials suddenly may fail
-This phenomenon occurs in environment where water is present
Ceramics Applications - ANS--Electrical and electronics industries
-Automobiles
-Gas turbine engine
-Coating metal
-Turbochargers
-Cylinder liners
