Alumina (Al2O3) is divided into white alumina, light yellow alumina and transparent light yellow alumina ceramics according to color. But we generally distinguish the purity of alumina ceramics, that is, divided into 99% alumina ceramics, 95% alumina ceramics, and 99.5% alumina ceramics.

Compared with 95% alumina, 99% alumina adopts high-purity alumina material and corresponding preparation process. Compared with 95% alumina, it has the advantages of density and microstructure, and it has suitable cost performance in terms of performance. The density is 3.85g/cm3, the bending strength is moderate, the hardness is moderate, and it has the inherent advantages of alumina ceramic materials. The maximum operating temperature can reach 1750°C, and the hardness HV10 can reach 1600; Higher performance, but the cost is greatly reduced compared to 99.7% alumina, suitable for parts with high performance requirements and moderate price.

95% alumina ceramics use pure alumina materials and diversified preparation processes. While ensuring the intrinsic properties of alumina ceramics, the manufacturing cost is continuously reduced, and it has the lowest material cost among the three. Two high-purity materials, their performance indicators have decreased, the density is slightly lower, and the density is 3.65g/cm3. The decrease in density leads to a decrease in the corresponding performance indicators, but still has all the excellent properties of alumina ceramics and is suitable for applications. The characteristics and advantages of alumina ceramics are suitable for general parts.

99.5% alumina is guaranteed by high-purity alumina material and a series of related strict processes, and the performance is more superior. Compared with 99% alumina and 95% alumina, the density is higher, reaching 3.90 g/cm3, the bending strength is higher, the advantages of the high content of the main crystal phase are more obvious, the hardness HV10 is above 1800, and the maximum service temperature is higher. High, can reach more than 1800 ° C; in summary, high purity brings higher performance, suitable for parts with harsh conditions and higher performance requirements.

Alumina ceramics have high mechanical strength and can be used as mechanical structural parts; high resistivity, good electrical insulation performance, can be made into substrates, sockets, circuit shells, etc.; high hardness, can be used to make tools, grinding wheels, abrasives, wire drawing dies, extrusion Molds, bearings, etc.; high melting point, good corrosion resistance, can be used as furnace tubes, crucibles, fibers, thermocouple protection tubes, etc.; excellent chemical stability, can be made into pure metal and single crystal growth crucibles, human joints, Artificial bone, etc.; can also be made into light-transmitting materials, manufacturing sodium vapor lamps, microwave fairings, infrared windows, laser oscillation components, etc.; can also be used as solar cell materials and battery materials