Silicon Carbide in Comparison

Technical SiC Ceramics

Silicon carbide is a chemical composite of silicon and carbon, which is one of the lightest and at the same time hardest ceramic materials. Silicon carbide ceramics differ depending on the manufacturing method, these include recrystallized (RSiC), sintered (SSiC), metal matrix bonded (e. g. SiSiC), metal reaction bonded (RBSiC), Si₃N₄ bonded (NSiC) and oxide bonded (e. g. mullitic bonded SiC). The ceramics have different porosities and densities. Schunk offers reaction bonded SiC (CarSIK-G, CarSIK-Z, IntrinSiC, CarSIK-GD, CarSIK-NT), nitride bonded SiC(CarSIK-NG) as well as mullite bonded SiC (CarSIK 70 ZA) and SSiC (CarSIK-SD).

Nr.	Material	Bulk density	Open porosity	Flexural strength (4 Point)	Compressive strength	Modulus of elasticity	Hardness	Thermal expansion coefficient RT – 400 °C	Thermal conductivity	Chemical composition
1	CarSIK-B4C	2.85 g/cm³	0 Vol.%	220 MPa		350 GPa	29000			B4C 30% SiC 57% Si 12%
2	CarSIK-G	3.09 g/cm³	0 Vol.%	280 MPa	1000 MPa	360 GPa	25000	4.9 µ/K	160 W/mK	SiC 88% Si 11%
3	CarSIK-GD	3.1 g/cm³	0 Vol.%	280 MPa	1000 MPa	360 GPa	25000	4.9 µ/K	160 W/mK	SiC 89% Si 10%
4	CarSIK-NG	2.85 g/cm³	1 Vol.%	200 MPa		220 GPa		4.6 µ/K	12 W/mK	SiC 65% Si3N4 + Si2ON2 27% Oxide 8%
5	CarSIK-NT	3.09 g/cm³	0 Vol.%	280 MPa	3000 MPa	360 GPa	25000	3.9 µ/K	120 W/mK	SiC 88% Si 12%
6	CarSIK-SD	3.1 g/cm³	0 Vol.%	390 MPa	3800 MPa	400 GPa	25000	4 µ/K	110 W/mK	SiC 98.5%
7	CarSIK-Z	3.09 g/cm³	0 Vol.%	280 MPa	1000 MPa	360 GPa	25000	4.9 µ/K	160 W/mK	SiC 88% Si 11%
8	IntrinSiC	3.05 g/cm³	0 Vol.%	210 MPa		380 GPa	25000	3.9 µ/K	200 W/mK	SiC 86% Si 14%
9	CarSIK-70ZA	2.1 g/cm³	25 Vol.%	30 MPa				5 µ/K	7 W/mK	SiC 70%

Nr.

Material

Image

Bulk density

Open porosity

Flexural strength (4 Point)

Compressive strength

Modulus of elasticity

Hardness

Thermal expansion coefficient RT – 400 °C

Thermal conductivity

Chemical composition

CarSIK-B4C

2.85 g/cm³

0 Vol.%

220 MPa

350 GPa

29000

B4C 30%
SiC 57%
Si 12%

CarSIK-G

3.09 g/cm³

0 Vol.%

280 MPa

1000 MPa

360 GPa

25000

4.9 µ/K

160 W/mK

SiC 88%
Si 11%

CarSIK-GD

3.1 g/cm³

0 Vol.%

280 MPa

1000 MPa

360 GPa

25000

4.9 µ/K

160 W/mK

SiC 89%
Si 10%

CarSIK-NG

2.85 g/cm³

1 Vol.%

200 MPa

220 GPa

4.6 µ/K

12 W/mK

SiC 65%
Si3N4 + Si2ON2 27%
Oxide 8%

CarSIK-NT

3.09 g/cm³

0 Vol.%

280 MPa

3000 MPa

360 GPa

25000

3.9 µ/K

120 W/mK

SiC 88%
Si 12%

CarSIK-SD

3.1 g/cm³

0 Vol.%

390 MPa

3800 MPa

400 GPa

25000

4 µ/K

110 W/mK

SiC 98.5%

CarSIK-Z

3.09 g/cm³

0 Vol.%

280 MPa

1000 MPa

360 GPa

25000

4.9 µ/K

160 W/mK

SiC 88%
Si 11%

IntrinSiC

3.05 g/cm³

0 Vol.%

210 MPa

380 GPa

25000

3.9 µ/K

200 W/mK

SiC 86%
Si 14%

CarSIK-70ZA

2.1 g/cm³

25 Vol.%

30 MPa

5 µ/K

7 W/mK

SiC 70%

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Silicon Carbide in Comparison

Ultra light and extremely hard

Technical SiC Ceramics

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