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Hexoloy® SA SiC Material
Hexoloy® SA SiC is a pressureless, sintered form of alpha silicon carbide, with a density greater than 98 percent theoretical. It has a very fine grain structure (4 - 10 microns) for excellent wear resistance and contains no free silicon, which makes it highly chemically resistant in both oxidizing and reducing environments,
Photomicrograph of Hexoloy® SA Silicon Carbide's typical appearance of pores when magnified.
Hexoloy® SA SiC Material Properties
| Property | Units | Typical Values |
| Composition* | - | SiC |
| Grain Size | µm | 4 - 10 |
| Density | g / cm3 | 3.10 |
| Hardness (Knoop)** | kg / mm2 | 2800 |
| Flexural Strength 4pt @ RT*** | MPa x103 lb / in2 | 380 55 |
| Flexural Strength 3 pt @ RT*** | MPa x103 lb / in2 | 550 80 |
| Compressive Strength @ RT | MPa x103 lb / in2 | 3900 560 |
| Modulus of Elasticity @ RT | GPa x106 lb / in2 | 410 59 |
| Weibull Modulus (2 parameter) | 8 | |
| Poisson Ratio | 0.14 | |
| Fracture Toughness @ RT Double Torsion & SENB | MPa x m1/2 x103 lb / in2 x in1/2 | 4.60 4.20 |
| Coefficient of Thermal Expansion RT to 700°C | x10-6 mm / mmK x10-6 in / in °F | 4.02 2.20 |
| Maximum Service Temp. Air | °C °F | 1900 3450 |
| Mean Specific Heat @ RT | J / gmK | 0.67 |
| Thermal Conductivity @ RT @ 200° C @ 400° C | W / mK Btu / ft h °F W / m°K Btu / ft h °F w / m°K Btu / ft h°F | 125.6 72.6 102.6 59.3 77.5 44.8 |
| Permeability @ RT to 1000°C | Impervious to gases over 31 MPa | |
| Electrical Resistivity @ RT**** @ 1000°C | ohm-cm ohm-cm | 102 - 1011 0.01 - 0.2 |
| Emissivity | 0.9 | |
| * Composition code: Si = free silicon metal; C = free graphite; SiC = silicon carbide ** Knoop 0.1 kg 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 | ||