Translucent polycrystalline ceramic and method for making same

Details Translucent polycrystalline ceramic and method for making same Translucent polycrystalline ceramic and method for making same

C - Chemistry, Metallurgy

04

B

25/134, 261/38

C04B 35/115 (2006.01) C04B 35/50 (2006.01) C04B 35/645 (2006.01) F16C 33/32 (2006.01) F16C 33/62 (2006.01) H01J 5/04 (2006.01) H01J 61/30 (2006.01)

Patent

CA 2308933

An translucent polycrystalline ceramic capable of transmitting a visible light and excellent in strength, hardness, abrasion resistance, light transmittance, transparency and high-temperature characteristics and usable as a material, for instance, for cutting tools, outer tubes for high pressure sodium lamps and high temperature furnace window plates. The translucent polycrystalline ceramic has at least one characteristic features that (1) a mean particle size of crystal particles formed inside the ceramic is not larger than 1.0 µm, (2) a mean aspect ratio thereof is from 1.0 to 1.5, (3) a density thereof is substantially a theoretical density, (4) a light transmittance through its thickness of 1 mm is at least 50%, (5) a mean facet length of crystal particles formed inside the ceramic is not longer than a maximum wave length of the light. One of the embodiments is a translucent polycrystalline Al2O3 ceramic containing 0.02 - 2.0 mol% of oxide of metal belonging to IIIA and/or IVA group (excluding Ti), having its density of at least 3.98 g/cm3, a mean crystal particle size of 0.3 - 1.0 µm, its bending strength of at least 1900 MPa and its Vickers hardness of at least 850 at 1000°C.

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