Production process
For these reasons, zirconia is an ideal material from which to make prosthetic components used in the dental field. Bettini S.r.l. manufactures products using carefully controlled high quality raw materials.
Property | U.d.M. | DB+TM | DB+LUXTM |
---|---|---|---|
Density | g/cm3 | 6,05 | 6,05 |
Flexural strength | MPa | >1000 | >1000 |
Compressive strength | MPa | >2100 | >2100 |
Fracture toughness (KIC) | MPa m1/2 | ≥5 | ≥5 |
Young’s (E) Modulus | GPa | 160 | 160 |
Hardness (HV, 500g) | GPa | >12.5 | >12,5 |
Open porosity | % | 0 | 0 |
Trasmittance | % | 0 | 41 |
Isostatic pressing method: The isostatic pressing process at 200 MPa ensures all parts have a excellent, homogenous density and shrinkage distribution. This guarantees that during and after the sintering process, the products will always have extremely constant material characteristics.
Mechanical processing method: Following the isostatic pressing process, the semi-finished parts can be shaped or machined to achieve the preferred geometry in accordance with product specifications.
Pre-sintering process: During this process, the semi-finished parts are sintered at a specific temperature that optimizes the subsequent processing stages. Specific, computer controlled kilns are used for the heating up, dwell and cooling down phases.
- From room temperature to 1000 °C heating rate between 200°C/h and 250°C/h (bigger the sample lower the heating rate)
- From 1000°C to 1450°C heating rate 150°C/h
- 1450°C keep for 2 hours
- Natural cooling (do not open the oven until the temperature drops to 150 °C)