Performance parameters of zirconia ceramics

Performance parameters of zirconia ceramics

The main component of zirconia ceramics is zirconia, while pure zirconia is a white solid that appears gray or light yellow when containing impurities. Adding a colorant can also display various other colors.

The molecular weight of pure zirconia is 123.22, the theoretical density is 5.89g/cm3, and the melting point is 2715 ℃. Usually contains a small amount of hafnium oxide, which is difficult to separate, but has no significant impact on the performance of zirconia.

Zirconia has three crystal forms: monoclinic, tetragonal, and cubic.

At room temperature, zirconia only appears as a monoclinic phase, and when heated to around 1100 ℃, it transforms into a tetragonal phase. When heated to a higher temperature, it transforms into a cubic phase.

Due to the significant volume changes that occur during the transition from monoclinic to tetragonal phases, and during cooling, significant volume changes occur in the opposite direction, which can easily cause product cracking and limit the application of pure zirconia in the high-temperature field.

However, after adding stabilizers, the tetragonal phase can be stable at room temperature, so there will be no sudden change in volume after heating, greatly expanding the application range of zirconia.

Performance parameters of zirconia ceramics:

Volume density: 5.5~6.05g/cm ^ 3;

Melting point: 2715 ℃;

Flexural strength: 1100MPa;

Fracture toughness: 12MPam ^ (1/2);

Hardness: 88~90HRA;

Elastic modulus: 220GPa;

Linear expansion coefficient: (6.5~11.2) X10 ^ (-16)/K;

Minimum achievable residual imbalance: ≤ 0.8Gmm/kg;

Imbalance reduction rate: ≥ 85%

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