Both of these materials are fine-grained and produced to near theoretical density, ensuring excellent wear resistance required for seal face products.
Both materials possess outstanding resistance to corrosion from chemicals with a wide range of pH values. Seal faces are produced to custom drawings with high quality surface finishes.
Features and Benefits
- Exceptional hardness
- Chemically inert to a broad range of chemicals
- Seal faces for mechanical seals used in industrial pumps
Physical Properties | Units |
SA |
Composition (phases) | SiC | |
Density | g/cm3 | 3.10 |
Grain Size | Qm | 4-10 |
Hardness (Knoop)** | kg/mm2 | 2800 |
Flexural Strength 4pt. @ RT*** |
MPa x103 lb/in2 |
380 55 |
Flexural Strength 3pt. @ RT*** |
MPa x103 lb/in2 |
550 80 |
Compressive Strength @ RT | MPa x103 lb/in |
3900 560 |
Modulus of Elasticity @ RT | GPa x106 lb/in |
430 62 |
Weibull Modulus (2 parameters) | 10 | |
Poisson Ratio | 0.14 | |
Fracture Toughness @ RT Double Torsion & SENB |
MPa x m½ 103lb/in2 x in½ |
4.60 4.20 |
Coefficient of Thermal Expansion RT to 700°C |
x10-6mm/mm°K x10-6in/in°F |
4.02 2.20 |
Max. Service Temp (air) | °C °F |
1900 3450 |
Mean Specific Heat @ RT | J/gm°K | 0.67 |
Thermal Conductivity @ RT | W/m°K Btu/ft h°F |
125.6 72.6 |
@ 200°C | W/m°K Btu/ft h°F |
102.6 59.3 |
@ 400°C | W/m°K Btu/ft h°F |
77.5 44.8 |
Permeability RT to 1000°C | All impervious to gases over 31 MPa | |
Electrical Resistivity @ RT*** |
ohm-cm | 102-108 0.01-0.2 |
Emissivity | 0.9 |
* Composition code: Si = free silicon metal; C = free graphite; SiC = silicon carbide
* Knoop 100-gm load
*** Test Bar Size: 3 x 4 x 45 mm (0.118" x 0.157" x 1.772")
*** Dependent upon dopants in Hexoloy® SA SiC which will decrease electrical resistivity
Physical Properties | Units | Value |
Composition* | Si • N | |
Grain Size | µm | < 2 |
Density | g/cm3 | 3.18 |
Hardness (Vickers)** | GPa | 16 |
Flexural Strength 4 pt @ RT*** | MPa | 800 |
Compressive Strength @ RT | MPa | 3500 |
Modulus of Elasticity @ RT | GPa | 320 |
Fracture Toughness @ RT Indentation |
MPA x m1/2 | 4.2 |
Color | gray | |
Coefficient of Thermal Expansion RT to 1,000°C |
x10-6 mm/mmK | 2.9 |
Thermal Conductivity @ 100 °C | W/mK | 29 |
Electrical Resistivity @ RT*** | ohm-cm | > 1012 |
Purity | % | |
Si3N4 | 95 | |
Al | 0.35 | |
C | 0.50 | |
Ca | 0.01 | |
Fe | 0.02 | |
Mg | 0.60 | |
O | 2.5 | |
Other | trace |
* Composition code: Si = Free silicon metal, N = Nitrogen, Si3N4 = Silicon Nitride
** Vickers 10 kg load
*** TestBar Size: 3 x 4 x 45 mm (0.118" x 0.157" x 1.772")
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Nuclear Energy
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