For those who are not familiar with ceramic grinding beads, they see similar technical specifications from different manufacturers. The reality is that the zirconium beads of each manufacturer are not the same, and their performance still varies greatly. So, how to judge the quality of ceramic beads when they look and have similar specifications? As a ceramic bead manufacturer that has been in business for 15 years, and whose technical director has been engaged in the research of zirconium oxide ceramics for more than 30 years, we can help you select and identify the zirconium beads that are best for your application. We will show you the difference between myth and fact in ceramic science.
Here are three points to guide you in choosing high-quality beads:
First, the raw materials of zirconium oxide beads
If you choose alumina balls, make sure that the supplier you choose uses high-quality alpha phase alumina (Al2O3) instead of other crystalline phases. Alpha phase alumina (Al2O3), the raw material is finer, the particle size distribution is uniform, has a higher whiteness, and remains relatively stable under high temperature or thermal conditions, which means that they have higher thermal stability.
If you choose zirconia beads, for zirconia micro beads (0.05mm, 0.1mm, 0.2mm, 0.3mm), make sure that the supplier you choose uses hydrothermal zirconia powder. This raw material has small original crystal particles, and the Vickers hardness of the zirconium balls produced is consistent inside and outside, and the wear is low during use. Compared with the powder made by the co-precipitation method, the hydrothermal powder equipment is complex, the process requirements are high, and the price of the powder is also high.
The above factors may not be found in the product TDS, but they are still important.
Conclusion:
1. The quality of the ceramic beads you use is important.
2. It is necessary to compare them outside the specifications indicated on the TDS.
3. If you need professional help and guidance when comparing and selecting ceramic beads, please contact us immediately.
Second, the zirconium bead forming method
Any process that converts zirconium oxide powder into zirconium oxide bead particles.
Several factors play a role in determining the mechanical properties of the finished product:
Compactness (consistent Vickers hardness inside and outside the bead)
Defect size (within a size range, no large or small beads)
Distribution within the particle (uniform distribution of bead sizes)
For beads less than 6 mm in diameter (called finely ground beads), the 3 main granulation techniques include:
Titration (for 0.05mm – 0.5mm)
Tumbling (for 0.6mm – 5mm)
Cold isostatic pressing (for 10mm – 50mm)
Conclusion：
While choosing the right molding method can be challenging, be aware that each molding method has advantages and accompanying limitations. The properties of ceramic beads produced by different manufacturers vary greatly.
Please contact us by email so that we can help you get started in selecting the right ceramic beads for your application.
Third: Improving Ceramic Bead Quality through Sintering
Sintering is a chemical process where the ingredients in the formulation react with each other. The goal is to give the ceramic beads strong mechanical properties such as crush load, hardness, toughness, etc.
The sintering process (heating, preservation, and cooling) plays a vital role in determining the overall quality of ceramic beads.
Small defects in the ceramic green body (before sintering) can be "healed" by merging and eliminating the transfer of micropores before the water phase moves at high temperature.
When the sintering speed is too fast, it will inevitably lead to a moisture gradient on the ceramic green body. This will cause stratification inside the ceramic beads, which is prone to broken beads during use.
Conclusion:
Sintering is the last and most critical stage of the industrial production of ceramic beads. The excellent mechanical properties of high-quality ceramic beads are achieved through strict control during the sintering process.
If you need expert help and the not-so-secret secrets of the tiny ceramic bead core, please contact us today.
