Silicon Carbides (SiC & SiSiC) « Advanced Ceramics

Silicon Carbide Ceramics has superior rapid cooling and rapid heating resistance, wear resistance, oxidation resistance, high bending strength, no falling slag, no crazing, have a long time service life, effective to control the uniform temperature inside the kilns and maintains high mechanical strength in temperatures as high as 1700°C. Silicon carbide has excellent hard wearing properties. It is not only the lightest, but also the hardest ceramic material and has excellent thermal conductivity, low thermal expansion and is very resistant to acids and chemicals.

Benefits using Silicon carbides

Corrosion resistant
High hardness
Chemically and thermally resistant
High thermal conductivity
Good RT and HT strength

Application of Silicon Carbide

Sliding bearings
Mechanical Seals for chemical pumps
Wear parts such as Thread guides
Kiln furniture crucibles
Burners for high temperature Furnaces
Sand Blasting Nozzles
Heat exchangers tubes
Semiconductor handling parts
Wafer processing Plates & Discs components

Technical Data of SiC & SiSiC - Silicon Carbide

Properties	SiC	SiSiC
Density (g/cc)	SiC (99%)	3.2
Porosity % (sub-micron)	3.15 ±0.03	0.0%
Maximum Temperature (°C)	410	1150°C
Flexural Strength (MPa) @ RT	2800	800
Weibull Modulus	3970 (560)	15-30
Elastic Modulus (GPa)	4	310
Poisson’s Ratio	0.21	0.27
Hardness HV (0.3) Kg/mm2	4×10-6	1800
Fracture Toughness (MPam1/2)	120	5.5
Abrasive Wear Resistance Parameter	0.67	1110
Thermal Expansion Coeff. 10-6/C; (RT-1000 C)	1500	3.1

Property values are estimated-typical and shouldn’t be considered as specifications.

Corosion Test Results

Test Environment*		Corrosive Weight Loss，mg/cm2/yr
Concentration Reagent, Wt%	Temperature	SiC	SiSiC
98% H2SO4	100°C	1.5	50.0
50% NaOH	100°C	2.5	>1000
53% HF	100°C	<0.2	7.0
85% H3PO4	100°C	<0.2	8.0
70% HNO3	100°C	<0.2	0.5
45% KOH	100°C	<0.2	>1000
25% HCl	100°C	<0.2	0.9
10% HF plus 57% HNO3	25°C	<0.2	>1000