Causes of Zirconia Bead Fragmentation

Zirconia beads and zirconia grinding balls refer to spherical grinding media made from zirconia. They are generally used for the ultra-fine grinding and dispersion of high-viscosity and high-hardness materials, and are mainly applied in the grinding of materials in industries such as electronic ceramics, magnetic materials, lithium battery materials, food, pigments, dyes, coatings, inks, and specialty chemicals.

Zirconia Ceramic Balls .They boast excellent properties such as high flexural strength, strong compressive resistance, high wear resistance, high toughness, and outstanding thermal insulation. As ultra-fine grinding media, zirconia microspheres are ideal products in the field of grinding media.

However, the high toughness of zirconia grinding balls is attributed to the presence of stabilizers, and this high toughness is time-sensitive. For example, when zirconia ceramic components are exposed to air for a period of time, they will become destabilized, and their performance will deteriorate drastically or even crack. Moreover, zirconia grinding beads lose their metastable phase at high temperatures, thus losing their high-toughness characteristics. Therefore, zirconia beads cannot be used for long periods at high temperatures or even at room temperature. These two drawbacks—inability to withstand high temperatures and poor time stability—seriously restrict the development of zirconia beads as grinding media.

 Nine Common Methods to Reduce the Wear of Zirconia Balls

For ultra-fine powder materials such as micron and nano-scale powders, nothing is more important than purity. Zirconia beads inevitably experience wear during use as grinding media, and the worn zirconia particles become impurities mixed in the high-purity powder. Excessive impurities will inevitably affect the service performance and product value of the high-purity powder. Common methods to reduce the wear of zirconia beads are as follows:

1. Select different types of zirconia beads according to the linear velocity of the ball mill.
2. Do not use zirconia beads of multiple material types; ensure that the zirconia beads have consistent physical and chemical properties. Use products from the same manufacturer and batch as much as possible to avoid mixing.
3. The filling volume of zirconia beads should not be excessive, and must not exceed 85%.
4. Zirconia beads require different densities corresponding to the viscosity of the grinding materials.
5. Timely remove zirconia beads with excessively small particle sizes.
6. The particle size of zirconia beads should be as uniform as possible.
7. When cleaning sand mills with zirconia beads, keep the rotation speed low, not exceeding 1000 revolutions per minute. For mechanically adjustable speed systems, the inching mode is recommended.
8. Regularly inspect areas of high stress concentration on various components of the sand mill to eliminate potential hazards.
9. When grinding high-value-added powders with strict purity requirements, silicon nitride beads can replace zirconia beads, offering greater cost and performance advantages.

The implementation of these nine methods to reduce zirconia bead wear should be adjusted according to the actual operating environment and working conditions.