What are the properties of 96 alumina ceramic sheets

Alumina ceramics is a new type of ceramics that is widely used now. Due to its different alumina content, it is divided into many types, such as 95 porcelain, 99 porcelain and so on. Its content will vary in performance.

96 alumina ceramic sheet is a white solid, which is a compound of aluminum and oxygen, and its molecular formula is Al2O3. Also known as bauxite in mining, ceramics and materials science. Common purity is 96%.

White solid insoluble in water, odorless, tasteless, extremely hard, easy to absorb moisture but not deliquescence. Amphoteric oxide, soluble in inorganic acid and alkaline solution, almost insoluble in water and non-polar organic solvent; relative density (d204) 4.0; melting point 2050℃.

1. The bulk density of 95% alumina ceramics has a great relationship with the selection of raw materials and the process of making ceramics. In the national standard GB/T5593-1999, the bulk density of 95% alumina ceramics is required to be above 3.60g/cm3.

In fact, the density of 95% alumina ceramics varies greatly depending on the molding method of porcelain making. Usually, the density is between 3.60-3.70 g/cm3 during hot die casting and grouting; and 3.70 g/cm3 during isostatic pressing. cm3; gel forming can reach 3.73 g/cm3.

2. Air tightness 95% alumina ceramics are used in microwave devices, vacuum switch tubes, etc., and require high vacuum air tightness. In the electronic industry standard SJ/T, it is stipulated that the air leakage rate of the sealing part QK≤1×10-11Pa.M3/S. In fact, it also stipulates that the air leakage rate of the ceramic itself should also meet the above standards.

3. Chemical stability The chemical stability of 95% alumina ceramics characterizes its ability to resist corrosion by various chemical reagents. The ability to resist corrosion by acid reagents is called acid resistance, and the ability to resist corrosion by alkaline agents is called alkali resistance.