- (1) High mechanical strength, the flexural strength of alumina ceramic sintered products can reach 250MPa, hot-pressed products can reach 500MPa, and the strength can be maintained at 900 ℃ at high temperatures
- (2) High resistivity, good electrical insulation performance, room temperature resistivity 1015Ω·cm, dielectric strength 15kV/mm
- (3) High hardness, Mohs hardness is 9
- (4) High melting point, anti-corrosion, melting point 2050 ℃, can better resist the erosion of molten metals such as Be, Sr, Ni, Al, V, Ta, Mn, Fe, Co, etc. It also has high resistance to corrosion by NaOH, glass and slag. It does not interact with Si, P, Sb and Bi in an inert atmosphere.
- (5) Excellent chemical stability, many composite sulfides, phosphides, arsenides, chlorides, nitrides, bromides, iodides, oxides, and sulfuric acid, hydrochloric acid, nitric acid, and hydrofluoric acid do not interact with alumina.
- (6) Optical properties, can be made into light-transmitting materials (transparent Al2O3 porcelain)
- (7) Ionic conductivity
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