Introduction to Alumina Transparent Ceramic Process

Alumina transparent ceramic material is a ceramic material that realizes transparency. It has the inherent properties of structural ceramics such as high temperature resistance, corrosion resistance, high strength, high hardness, chemical stability and biocompatibility, as well as the functional property of light transmission. It has been used in energy, machinery, military, electronics, semiconductor , Medicine and other high-tech fields have been more and more applied. Figure 1 (a) Transparent alumina brackets (b) Transparent alumina armor (1) The definition and influencing factors of transparent ceramics Krell and others at the Fraunhofer Institute in Germany strictly distinguish the two concepts of 'transparent' and 'translucentOthers believe that only ceramics with good transparency at a certain distance from the object are transparent ceramics, otherwise they can only be called translucent ceramics. my country generally believes that the linear light transmittance in the visible light region exceeds 15%, which can be called transparent ceramics. Figure 2 Translucent, dielectrically transparent and fully transparent chinaware ceramic. The light loss through ceramic polycrystals mainly includes three parts: 1. Surface reflection loss, which is generally 7-8% for alumina; 2. Two-phase loss (pores) , Impurities, two crystals equal), the light loss caused by the significant difference between the refractive index of the two phases and the ceramic matrix. For example, the refractive index of oxide ceramics is generally 1.3-2.7, and the pores, that is, the refractive index of light in the air is 1.003; 3. There is birefringence on the grain boundaries of all non-equaxial crystal systems, and birefringence can cause additional light scattering . For example, the two refractive indexes of alumina ceramic grain boundaries are 1.760 and 1.768. Therefore, the factors affecting the transparency of ceramics include porosity, grain size, crystal structure symmetry, grain boundary structure, surface finish and so on.

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