Aluminum oxide ceramic is a kind of ceramic material whose main crystalline phase is α-Al2O3, which is the most stable and also the only Al2O3 crystalline form that exists in the nature. For the features of high melting point, excellent hardness, outstanding corrosion resistance and dielectric property, α-Al2O3 ceramic is widely used as material for industrial parts, and the manufactured products have excellent mechanical property, high-temperature resistance, dielectric property and corrosion resistance.

• Optical property

Alumina ceramics can be processed as translucent materials to manufacture products like sodium-vapor lamp tubes, infrared windows and laser oscillators, etc.

• High electrical resistance

Alumina ceramic shows good electrical insulation property, the electrical resistance is 1015Ω·cm at room temperature and a dielectric strength is 15kV/mm. For its high electrical resistance and dielectric strength, alumina ceramics can be used to fabricate substrates, tube sockets, spark plugs, circuit packages, etc.

• High melting point

Alumina ceramic can withstand high temperature, and the melting point is 2050℃. It can strongly resist corrosion of molten metals such as Be, Sr, Ni, Al, V, Ta, Mn, Fe, Co, also have high resistance to corrosion of NaOH, glass and furnace slag, so alumina ceramic is widely used for manufacturing furnace tubes and glass drawing crucibles.

• High mechanical strength

Bending strength of sintered alumina ceramic products can reach up to 250MPa, and for hot pressed products, the bending strength is 500MPa. Its mechanical strength depends on the purity of aluminum oxide. The higher purity, the higher mechanical strength can be obtained. Moreover, even at high temperature of 900℃, its mechanical strength can be effective maintained. Taking advantage of its high mechanical strength, alumina ceramic can be used to manufacture mounting ceramic and other mechanical components.

• Good chemical stability

Al2O3 does not react with chemical compounds, such as sulfide, phosphide, chloride or oxide, either react with acid like sulfuric acid, hydrochloric acid, nitric acid or hydrofluoric acid etc., therefore Al2O3 is an ideal material to be applied in human joints, artificial bones and poly-crystalline alumina ceramic artificial teeth with hydroxyapatite coating, etc.