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 | 3.15 |
| 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*** @ 1,000°C | 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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