1. Microstructure and size of semi-friable aluminum oxide
The microstructure and size of semi-friable aluminum oxide are the most important indicators to determine the quality of semi-friable aluminum oxide. Through the microstructure, we can see whether the homogeneous structure in the eutectic is perfect, whether there is a separated phase and how much the separated phase is, and whether the separated phase is zirconium oxide or aluminum oxide. The size of the crystal can also be seen through the microstructure. The smaller the crystal size, the more units involved in grinding, and the longer the grinding life.
Whether the microstructure of the semi-friable aluminum oxide eutectic is perfect and whether the microcrystalline size is small enough mainly depends on the cooling speed during the abrasive smelting. If the cooling speed is fast, the microcrystalline structure of the abrasive eutectic is good, the phase separation is less, and the crystal size is small; otherwise, the cooling speed is slow, the structure of the abrasive eutectic is poor, the phase separation is more, and the crystal size is large.
2. Zirconia content of semi-friable aluminum oxide
Whether the zirconium oxide content of semi-friable aluminum oxide is stable is the most important indicator to judge whether the quality of semi-friable aluminum oxide is stable.
We know that the fundamental reason for the fluctuation of product grinding performance is the change of abrasive hardness and toughness, and the reason for the change of hardness and toughness is the change of microstructure. The reason for the change of microstructure is the toughening and strengthening of particle phase or stress concentration caused by phase separation. Therefore, the key to stabilizing product quality is to control phase separation.
3. Grain size composition
The grain size composition of semi-friable aluminum oxide abrasive is different from the national standard. Compared with the national standard, the grain size composition of semi-friable aluminum oxide abrasive of well-known brands has higher coarse grains and basic grains of some grain sizes.
