99alumina ceramics.mp4

engineering 99 99.5 Al2O3 ceramic machining air cylinder

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Alumina Ceramics:

The water content of the ceramic green body is generally between 5% and 25%, the combination of the green body and moisture, the change of the material during the drying process and the factors that affect the drying rate are the theoretical basis for analyzing and improving the dryer. Contact with still air at a certain temperature and humidity will inevitably release or absorb moisture, so that the moisture content of the green body reaches a certain equilibrium value. As long as the state of the air remains unchanged, the moisture content achieved in the green body will no longer be due to contact time The value of the green body in this air state is the equilibrium moisture of the green body. The moisture lost by the wet green body reaching the equilibrium moisture is free moisture. That is to say, the moisture of the green body is composed of balanced moisture and free moisture. In a certain air state, the limit of drying is to make the green body reach equilibrium moisture. The water contained in the green body can be divided into physical water and chemical water. The drying process only involves physical water, and the physical water is divided into bound water and unbound water. Unbound water exists in the large capillary of the green body and is loosely bound to the green body. The evaporation of the non-bound water in the green body is just like the evaporation of water on the free liquid surface, and the partial pressure of water vapor on the surface of the green body is equal to its surface The partial pressure of saturated water vapor at the temperature. When the unbound water in the green body is discharged. The particles of the material are close to each other, so the volume shrinks, so the unbound water is also called shrinkage water. The bound water is present in the micro capillary of the green body (diameter Water less than 0.1 μm) and on the surface of the colloidal particles are more firmly bound to the green body (physicochemical effect), so when the bound water is discharged, the partial pressure of water vapor on the surface of the green body will be less than the saturation at the surface temperature of the green body Water vapor partial pressure. During the drying process, when the partial pressure of water vapor on the surface of the green body is equal to the partial pressure of water vapor on the surrounding drying medium, the drying process stops, and the moisture cannot continue to be discharged. Water, balance water is a part of combined water, its amount depends on the temperature and relative humidity of the drying medium.

High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc. 

Data Sheet↓

Thermal Shock Resistance: 200 △T°C

Maximum use temperature 1650°C

Dielectric Strength: ＞10 KV/mm

Dielectric Constant: 9.1er

Dielectric Loss Angle(1MHz): 0.0002-0.0003

Volume Resistivity(20°C): ＞1014Ω.cm

7.MOQ is not limited, small quantity is welcome.

8.Vigorous team and good after-sales service

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