Preparation method of transparent aluminum oxide ceramic

Abstract

The invention discloses a preparation method of transparent aluminum oxide ceramic. The preparation method comprises the following steps: mixing magnesium oxide, a dispersant and a plasticizer, then,adding aluminum oxide powder and deionized water to carry out ball milling for 6h, and then, adding a defoaming agent and a binder to carry out ball milling for 10h to obtain water-based tape castingslurry; carrying out tape casting on the water-based tape casting slurry, and drying a wet film obtained by tape casting to obtain a transparent aluminum oxide blank sheet with the thickness of 1mm; slowly removing the binder at 260 DEG C; next, placing a product into a corundum aluminum oxide tube furnace, and sintering the product in a 4% H2/N2 reducing atmosphere at 1200-1300 DEG C for 25min, wherein the heating rate is 6 DEG C/min, and the cooling speed is 3-6 DEG C/min; and carrying out plane grinding and surface polishing treatment on the sintered product to obtain the transparent aluminum oxide ceramic.

Description

Technical field: [0001] The invention relates to the technical field of preparation of inorganic materials, in particular to a preparation method of transparent alumina ceramics. Background technique: [0002] Transparent ceramics refer to polycrystalline materials with certain light transmittance prepared by ceramic technology. Transparent ceramics not only have the inherent high strength, high hardness, high temperature resistance, corrosion resistance, excellent chemical stability and other properties of ceramics, but also have the optical properties of glass and excellent dielectric properties, low electrical conductivity, high thermal conductivity, etc. The unparalleled performance of other materials, so it can be widely used in high-tech fields such as lighting technology, laser technology, special instrument manufacturing, high temperature technology, wireless electronics, information detection technology and military industry. Transparent alumina ceramics are the fir...

AI Technical Summary

Problems solved by technology

[0003] The molding processes of transparent alumina ceramics mainly include dry pressing molding, injection molding, extrusion molding, and isostatic pressing molding, etc., but it is difficult to prepare transparent ceramics with a thickness of tens of microns to between tens of microns and a smooth and defect-free surface by using these molding processes. Blank, tape casting is a more effective process for preparing single-phase or multi-phase ceramic sheet structural materials, and has high production efficiency, continuous operation, small defect size, small product component fluctuation, stable performance, and mass production. Suitable for forming large-scale thin plates Ceramics and other advantages, but in order to obtain better flexibility, it is often necessary to add a large amount of organic matter, which requires strict control of process parameters, otherwise it will easily cause defects such as peeling, streaks, low strength of the green sheet and difficult to peel off. At the same time, the used Organic matter is easy to cause environmental pollution because of its toxicity