Preparation method of Y2O3-MgO infrared transparent ceramic

Abstract

The invention discloses a preparation method of Y2O3-MgO infrared transparent ceramic, and belongs to the technical field of transparent ceramic materials. The method comprises the following steps: weighing Y2O3 nano powder and MgO nano powder in proportion, respectively carrying out ball milling, drying and sieving, and uniformly conducting mixing to obtain nano composite powder; putting the nanometer composite powder into a muffle furnace for pre-burning and glue discharging treatment, so as to remove organic matter in the powder; putting the nano composite powder subjected to glue removal treatment into a graphite mold, and carrying out hot pressed sintering to obtain a multiphase ceramic green body; and connecting the multiphase ceramic green bodies in series in a circuit, applying electric field intensity for flash sintering, and conducting cooling to obtain the high-density Y2O3-MgO ceramic. According to the preparation method, hot pressed sintering is carried out in a graphite mold, and a large number of oxygen vacancies are introduced into the multiphase ceramic green body, so that flash sintering can be carried out in the environment of a relatively low temperature field and an electric field, finally, the growth of grain sizes is inhibited while high density is achieved, improvement of mechanical properties and stability of transmittance are facilitated, and the material can be used as an infrared window material.

Description

technical field [0001] The invention relates to a preparation method of an infrared optical window material, in particular to a Y 2 o 3 - A method for preparing MgO infrared transparent ceramics, belonging to the technical field of transparent ceramic materials. Background technique [0002] Infrared optical window materials refer to a class of materials used to manufacture windows, fairings, etc. in infrared imaging and guidance technology. These materials have good infrared transparency, wide transmission band and certain mechanical strength. In recent years, infrared-guided aircraft has developed towards faster attack speed and higher strike accuracy, and higher performance requirements have been put forward for infrared window materials, such as higher mechanical properties and lower emissivity. [0003] Among common infrared window materials, Y 2 o 3 Ceramics have high thermal and chemical stability, but their mechanical properties are low. The introduction of MgO...

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Problems solved by technology

[0007] The purpose of the present invention is: for existing Y 2 o 3 - MgO nanocomposite ceramics sintering technology has complex sintering process, high sintering temperature, long holding time, and the need for sintering aids. Provide a Y 2 o 3 -The preparation method of MgO infrared transparent ceramics, by hot pressing and sintering in graphite mold, introducing a large number of oxygen vacancies into the composite ceramic green body, so that flashing can occur in the environment of lower temperature field and electric field, thus The sintering process is completed in a few minutes or even tens of seconds, and finally achieves high density while suppressing the growth of grain size, which contributes to the improvement of mechanical properties and the stability of transmittance

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