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.
|Fracture toughness (KIC)||MPa m1/2||≥5||≥5|
|Young’s (E) Modulus||GPa||160||160|
|Hardness (HV, 500g)||GPa||>12.5||>12,5|
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)