Submicron transparent crystal alumina ceramic possessing high linear transmittance

Abstract

The present invention belongs to the field of transparent ceramic material technology, and is especially preparation process of submicron transparent crystal alumina ceramic possessing high linear transmittance. The transparent alumina ceramic is prepared with high purity alumina and nanometer zirconia additive, and through drying pressing and cold isostatic pressing or gel injecting to form, low temperature pre-sintering and hot isostatic pressing sintering. It has ceramic body relative density greater than 99.95 %, average crystal size not greater than 0.5 micron, Vickers hardness of 2200, bending strength of 650-800 MPa and linear transmittance at 600 nm greater than 60 %. It is suitable for use in making transparent bulletproof armoring, high temperature observation window, false teeth, etc.

Description

technical field

[0001] The invention relates to a transparent ceramic material and a preparation method thereof, in particular to a submicron grain transparent alumina ceramic with high linear light transmittance and a preparation method thereof. Background technique

[0002] With the widespread use of high-pressure discharge lamps such as high-pressure sodium lamps and metal chloride lamps, polycrystalline transparent alumina sintered bodies have been extensively researched and produced. In order to make these polycrystalline alumina ceramics have good light transmittance, most preparation methods use a certain proportion of additives and high-temperature sintering. Patent US4222978 uses three-component additives, patent CN86101452 uses Y, Mg, La, Zr oxide four-component additives, and patent CN1444250A uses magnesium oxide and lanthanum oxide additives to sinter in a reducing atmosphere at a temperature of 1650-1900 ° C. Although the alumina ceramics sintered by these met...