Zirconia core

Comprehensive Introduction to Zirconia Core Products

Zirconia cores are industrial refractory products made from stabilized zirconia (ZrO₂) as the main raw material, combined with auxiliary materials such as magnesium oxide and yttrium oxide.  They are manufactured through grinding, high-pressure molding, and high-temperature firing at 1500℃. This material, formed by high-temperature sintering of zirconia powder, has a dense microstructure, uniform grain size, and a hardness second only to diamond, allowing it to maintain stable performance in extreme environments.

1. Zirconia material has three crystal phases:

Monoclinic zirconia: Low-temperature stable phase (below 1170℃), with an asymmetrical structure, sensitive to small structural changes.

Tetragonal zirconia: Medium-temperature stable phase (1170-2370℃), with higher symmetry and excellent mechanical properties.

Cubic zirconia: High-temperature stable phase (above 2370℃), highly symmetrical, with good ionic conductivity.

Core Performance Advantages

1. Mechanical Properties:

Mohs hardness reaches 7-8.5, close to sapphire.

Bending strength is up to 1200 MPa, three times that of aluminum alloy.

Density is 6.0 g/cm³, lighter than metal materials.

2. Thermal Properties:

Melting point is as high as 2715℃.

Thermal expansion coefficient is close to that of metals, with excellent thermal stability.

Can withstand rapid cooling and heating temperature differences of 1600℃ without cracking.

3. Chemical Properties:

Extremely strong corrosion resistance to most acids, bases, and salts.

Weight loss is less than 0.01g after immersion in 10% hydrochloric acid for 30 days.

The surface is not easily contaminated, avoiding clogging problems.

4. Special Functions:

Low dielectric constant (10-30), does not shield 5G millimeter wave signals.

Oxygen ion conductivity, suitable for solid oxide fuel cells.

Excellent biocompatibility, suitable for medical implants.

Application areas

Supports custom specifications.