Ferro-Ceramic Grinding Inc. machines over 15 different materials
Graphite
Graphite Graphite oxidizes under (heated) use in an air (oxidizing) environment, and therefore finds its use in inert.
Graphite Properties
Graphite oxidizes under (heated) use in an air (oxidizing) environment, and therefore finds its use in inert and vacuum applications such as furnace insulation packages and semiconductor. This material has the same lubricious properties as boron nitride thanks to the same crystal structure. Used in inert atmospheres, use temperature can be upwards of 3500°C.
| Properties | Units | Test | Value |
|---|---|---|---|
| Physical | |||
| Chemical Formula | - | - | C |
| Density, r | g/cm3 | ASTM C20 | 2.25 |
| Color | - | - | black |
| Crystal Structure | - | - | hexagonal |
| Water Absorption | % @R.T. | ASTM C373 | 0.5 - 3.0 |
| Hardness | Moh's | - | 1.0 - 1.5 |
| Hardness | knoop (kg/mm2) | Knoop 100g | -- |
| Mechanical | |||
| Compressive Strength | MPa @ R.T. | ASTM C773 | 96 |
| Tensile Strength | MPa @ R.T. | ACMA Test #4 | 4.8 |
| Modulus of Elasticity (Young's Mod.) | GPa | ASTM C848 | 4.8 |
| Flexural Strength (MOR) | MPa @ R.T. | ASTM F417 | 50 |
| Poisson's Ratio, u | - | ASTM C818 | -- |
| Fracture Toughness, KIc | MPa x m1/2 | Notched Beam Test | -- |
| Thermal | |||
| Max. Use Temperature (* denotes inert atm.) | ºC | No load cond. | 3650 * |
| Thermal Shock Resistance | DT (ºC) | Quenching | 200 - 250 |
| Thermal Conductivity | W/m-K @ R.T. | ASTM C408 | 24 |
| Coefficient of Linear Thermal Expansion, al | mm/m-ºC (~25ºC through ±1000ºC) | ASTM C372 | 8.39 |
| Specific Heat, cp | cal/g-ºC @ R.T. | ASTM C351 | 0.16 |
| Electrical | |||
| Dielectric Constant | 1MHz @ R.T. | ASTM D150 | -- |
| Dielectric Strength | kV/mm | ASTM D116 | -- |
| Electrical Resistivity | Wcm @ R.T. | ASTM D1829 | 7 x 10-3 |
*Although we have no reason to doubt the accuracy of the data presented, Ferro-Ceramic Grinding Inc. offers this information for comparison only, and disclaims any and all liability from error, omissions or inaccuracies, such that it does not constitute a warranty or representation for which we shall assume legal responsibility.