There are many kinds of alumina wear-resisting ceramics, toughened alumina ceramics and zirconia wear-resisting ceramics. It is also used as a variety of products, such as: wear-resistant ceramic tube, ceramic wear-resistant tube, wear-resistant ceramic lining plate, heavy medium cyclone, cyclone separator, wear-resistant ceramic roller coating, chute, pipeline and so on.
Industry insiders know that natural alumina is corundum, Mo hardness of 9, cubic zirconia Mo hardness of 8.5, but from the point of view of the use of industrial wear-resistant ceramics, not the higher the hardness, the better, but also look at the toughness of ceramics, hardness and toughness are high, can be said to be the best wear-resistant ceramics. This is not to say that zirconia ceramics are not as good as alumina ceramics, zirconia ceramics at high temperature lattice phase is very stable, reduced to normal temperature zirconia ceramics lattice damage. So at room temperature, in terms of pure alumina and pure zirconia, alumina has a higher hardness and is theoretically more wear-resistant. But the alumina wear-resistant ceramics are a mixture, which is manually mixed and then dry-pressed and sintered at 1680℃, not pure corundum. Therefore, to see the alumina content of ceramics, some manufacturers have 85% alumina ceramics, 92% alumina ceramics, 95% alumina ceramics, 99% alumina ceramics and other ceramics, Jingcheng wear-resistant ceramics in this wear-resistant ceramic industry research is very deep and professional, Jingcheng production of wear-resistant ceramics with a hardness of HRA82-90, Fracture toughness KIC≥7.5Mpa.m1/2, hardness second only to diamond.
The lattice of zirconia ceramics is stable at high temperature, but its lattice phase is damaged at normal temperature. Therefore, 5.6% stabilizer (rare earth, etc.) must be added for 94.4% zirconia to reach a stable state at normal temperature. The powder is dry pressed and sintered at 1560℃, and the hardness and toughness will exceed 99% alumina ceramics. Its wear resistance and impact resistance is more than 99% alumina ceramics. If the stabilizer is not added, the ceramic is easy to crack, so the zirconia ball as a grinding material, because it has the characteristics of hardness and toughness are great.
