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Non-Oxide Ceramics (Si-Based Ceramics (SiN (Types (Sintered, Reaction…
Non-Oxide Ceramics
Si-Based Ceramics
Pros
Low Density
Low Thermal Expansion Coeff
Good Thermal Shock Resistance
Protective SiO2 layer formed
Cons
Hard to process
Low Sinterability
Crystal Structures
Cubic
Beta
Hexagonal
Alpha
Types
Hot-Pressed SiC
Sintered SiC
Reaction Sintered
SiC Components
High Wear Resistance
High Corrosion Resistance
High Temp Properties
SiN
Ionic 30% Covalent 70%
Protective SiO2 layer formed
High Strength
Good Oxidation Resistance
Engine & Gas Turbine Applications
Better thermal shock resistance than SiC
Excellent Wear Resistance
Good Fracture Toughness
Synthesis
Si Direct Nitration Method
Types
Sintered
Reaction Bonded
Sintered Reaction Bonded
Hot Pressed
Hot Isostatic Pressed
Chemical Vapour Deposited
Process
Sintering
SiN surrounded by silica layer
Elements
Light
Example
B
C
N
Al
Si