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Silicon Carbide (SiC) Ceramics

Silicon Carbide is the only chemical compound of carbon and silicon. It was originally produced by a high temperature electrochemical reaction of sand and carbon. Silicon carbide is an excellent abrasive and made into grinding wheels and other abrasive products for over one hundred years. Today the material has been developed into a high quality, technical grade ceramic with very good mechanical properties. It is used in abrasives, refractories, ceramics, and numerous high-performance applications. Structural and wear applications are constantly developing. The material is also an electrical conductor and has applications in resistance heating, flame igniters and electronic components.

Silicon carbide has the highest corrosion resistance of the advanced ceramic materials. Its strength also retains its strength at temperatures as high as 1400℃ and offers excellent wear resistance and thermal shock resistance. Applications include mechanical seals, gas turbine components, roller and wear and corrosion related parts. SICCAS can offer components of SiC and SiC based ceramics.
 
Properties of SiC monolithic ceramics

Properties
PLS SW9
Hot-Pressed
RB RB24
SBC
SSA
Density (g/cm3)
3.02-3.13
3.17
3.22
3.06
Bending Strength (MPa)
400-500
500
710
600
Hardness (HRA)
93.5-94.5
93
93
92-93
Fracture Toughness (MPa·m1/2)
3.5-4.0
4.0
5.0
4.3
Thermal Expansion
 
 
 
 
Coefficient (×10-6℃)
4.9
4.5
4.5
5.0

 
Properties of SiC and Al2O3 based composites

Composition
Processing
Strength
(MPa)
Toughness (MPa·m1/2)
Density (g/cm3)
SiC
HIP
1000
8.4
3.20
SiC-TiC
HP
580
7.1
3.64
SiC-TiC-Al2O3
HP
700
6.5
3.65
β-SiC-TiC-Al2O3
HP
670
7.2
3.64
SiC-TiB2-Al2O3
HP
888
8.7
3.55
SiC-ZrB2
HP
560
6.5
3.59
SiC-Al2O3
HP
750
4.0
3.30
SiC-AIN
PLS
350-410
4.5
3.15
 
HP
1128
6.6
3.2
SiC-YA
PLS
704
10.5
3.27
SiC-SiCw
HIP
920
8.5
3.17
SiC-β-Sialon
HIP
908
 
3.19
Al2O3-TiC
HP
611
5.6
 
Al2O3-SiCp
HP
580
5.4
3.72
Al2O3-SiCw-SiCp
HIP
1033
 
3.75

 
Main Performances of Pressureless Sinter Silicon Carbide and Reaction Bonded Silicon Carbide

Item
 
 
Process
Pressureless Sinter Silicon Carbide
Reaction Bonded
Silicon Carbide
Density (g/cm3)
3.13
3.00-3.05
Hardness (HRa)
93.5-94.5
87-89
Bend Strength (MPa)
400-500
300-340
Fracture Toughness (MPa·m1/2)
3.5-4.0
/
Compressive Strength (MPa)
 
1120
Thermal Expansion Coefficient (×10-6℃)
4.9
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