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What is zirconia toughened alumina ceramic?

ZTA is zirconia toughened alumina ceramic, which is an inorganic non-metallic material.

The toughening of alumina ceramics is currently the most commonly used method of toughening is to add 20% zirconia (ZrO2) to toughen. When pure Zr02 is added to alumina and the particles form ZrO2 toughened alumina ceramics, when the added content is appropriate, the toughness can be significantly improved.

The toughening effect mainly comes from the following mechanism:

1. Refine the alumina crystal grain matrix.

2. Zirconia phase transformation and toughening.

3. Microcrack toughening.

4. Crack turning and bifurcation.

Zirconia toughened alumina ceramics (ZTA ceramic tile)have density ≥4.1, Rockwell hardness ≥90, Vickers hardness ≥1300, fracture toughness 6.0, flexural strength 480MPa, and compressive strength 3600MPa;

Toughened alumina ceramics are based on alumina with a certain amount of zirconia ceramic ingredients. The wear resistance and toughness are between alumina ceramics and zirconia ceramics. Because the price of zirconia ceramics is higher, users are disposable The manufacturers with relatively large investment and the most production and use are mainly European and American companies and large Australian groups.

The lattice of zirconia ceramics is stable at high temperatures, and the lattice phase is damaged at room temperature. Therefore, 94.4% of zirconia must be stabilized at room temperature and 5.6% stabilizers (rare earth, etc.) must be added, and the powder is dry pressed. , Sintered at 1560℃, the hardness and toughness will exceed 99% alumina ceramics, and its wear resistance and impact resistance will exceed 99% alumina ceramics. If no stabilizer is added, ceramics are prone to cracking, so the zirconia ball is used as an abrasive material because it has great hardness and toughness.

Therefore, the characteristics of wear-resistant ceramics are prominent, as follows:

1. High hardness and excellent wear resistance

2. Strong toughness (excellent impact resistance)

ZTA25 sample.jpg

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