Technical ceramics
Home / Technical ceramics
The technical ceramic for industrial uses is an inorganic and non-metallic compound that delivers high performances not comparable with other materials.
After our long experience in machining ultra-hard materials we can offer custom-made products in little or medium series.
There are many types of fine ceramics meeting almost every requirement:
– Steatite, Cordierite, Mullite: ceramics based on silicate with high electrical insulation and thermal-insulating properties.
– Alumina (Al2O3): best known ceramic with high mechanical strength, hardness and to corrosion.
– Zirconia (ZrO2): high strength to breaking combined with low thermal conductivity.
– Silicon Nitride (Si3N4): high strength at elevated temperatures, thermal shock and breaking.
– Tungsten Carbide (WC): high resistance to abrasion and high temperatures.
Take a look at the table for more technical information.
Ceramic
| Properties | Unit | Alumina | Zirconia | Silicon Nitride | ||
|---|---|---|---|---|---|---|
| Formula | – | Al2O3 | Al2O3 | Al2O3 | Zr02 | Si3N4 |
| Composition | Gew.% | 97,5 | 99,8 | 99,99 | – | >90 |
| Density | g/cm3 | 3,78 | 3,86 | 3,97 | 5,95 | 3,10 |
| Hardness | HV | 1600 | 1900 | 2100 | 1200 | 1550 |
| Compression strength | MPa | 2200 | 2500 | 3800 | 2200 | 3000 |
| Bending strength | Mpa | 320 | 350 | 470 | 850 | 750 |
| Fracture toughness K1c | MN/m3_2 | – | 3,5 | 4 | – | 6 |
| Modulus of elasticity | Gpa | 310 | 350 | 380 | 200 | 300 |
| Coefficient of thermal expansion | 10-6/K | 7,4 | 7,8 | 8,0 | 9,8 | 3,2 |
| Thermal conductivity | W/mK | 23 | 29 | 30 | 22 | 40 |
| Specific heat | J/kgK | – | 900 | 900 | – | 700 |
| Maximum use temperature in air | °C | 1500 | 1900 | 1900 | 1000 | 1100 |
| Chemical resistance | acids/bases | good/ good |
excellent/ good |
excellent/ good |
– | excellent/ good |
Tungsten Carbide
| Type | Hardness | Density | Grading | Bending strength | Coefficient of thermal expansion | |
|---|---|---|---|---|---|---|
| ISO | HR A | HV10 | g/cm3 | m | MPa | 10-6/C |
| P15 | 91,0 | 1400 | 11,10 | 23 | 2150 | 5,5 |
| P25 | 91,2 | 1440 | 12,50 | 23 | 2250 | 6,0 |
| P35 | 90,0 | 1340 | 13,35 | 23 | 2400 | 6,0 |
| K03 | 93,0 | 1750 | 14,80 | <1 | 2400 | 5,0 |
| K05 | 92,8 | 1720 | 14,70 | 1 | 2400 | 5,0 |
| K10 | 93,0 | 1750 | 15,05 | 1 | 2000 | 5,0 |
| K20 | 92,0 | 1600 | 14,85 | 1 | 2300 | 5,5 |
| K30 | 90,6 | 1380 | 14,65 | 23 | 2700 | 6,0 |
| K40 | 89,5 | 1300 | 14,40 | 23 | 2900 | 6,5 |
| K50 | 87,0 | 1050 | 14,00 | 23 | 2900 | 6,5 |