A kind of composite window material and preparation method thereof

A window, aluminum nitride technology, applied in the field of composite window materials and their preparation, can solve the problems of non-tunable optical constants, AlON ceramics cannot use tunable windows, etc., and achieve significant terahertz transmittance and tunable switching characteristics. , the effect of huge application prospects

CN108530072BActive Publication Date: 2020-07-03SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-07-03

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Abstract

The invention provides a complex window material and a preparation method thereof. The method includes the steps: preparing an aluminum oxynitride ceramic; heating vanadium pentoxide to be melted, pouring deionized water, and stirring and filtering the materials to obtain vanadium pentoxide sol; cleaning the aluminum oxynitride ceramic and performing hydrophilic treatment to hydroxylate the surface of the aluminum oxynitride ceramic; depositing the vanadium pentoxide sol on the surface of the aluminum oxynitride ceramic combined with hydroxy or coating the surface of the aluminum oxynitride ceramic combined with hydroxy with the vanadium pentoxide sol, drying the vanadium pentoxide sol, and performing annealing reduction in vacuum to obtain the complex window material with the surface of the aluminum oxynitride ceramic deposited / coated with a vanadium dioxide film. The complex window material comprises the transparent aluminum oxynitride ceramic and the vanadium dioxide film, wherein the transparent aluminum oxynitride ceramic serves as a substrate, and the surface of the transparent aluminum oxynitride ceramic is deposited / coated with the vanadium dioxide film. The preparation method is simple, and the complex window material displays remarkable tunable switching characteristics within infrared and terahertz ranges and has excellent phase transition properties and an effectiveswitch ratio.
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Description

technical field

[0001] The invention relates to the technical field of optical window materials, more specifically, to a composite window material and a preparation method thereof. Background technique

[0002] Transparent aluminum oxynitride (AlON) ceramics, an important optical window material, has attracted increasing attention since 1978 because of its excellent properties. Its excellent mechanical strength, good corrosion resistance, good dielectric properties and high optical transparency make it have broad application prospects in many fields, such as transparent armor, infrared / visible light windows and military missiles. The optical transparency of AlON ceramics is related to their synthesis methods and process parameters, and the optical constants themselves are not adjustable. Therefore, AlON ceramics produced by traditional processes cannot be used for tunable windows.

[0003] Vanadium dioxide (VO 2 ) is a typical thermally induced phase change material, which...

Examples

Embodiment Construction

[0027] Hereinafter, the composite window material and the preparation method thereof according to the present invention will be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0028] Specifically, the optical transparency of aluminum oxynitride (AlON) transparent ceramics is related to its ceramic microstructure and density. Aluminum oxynitride transparent ceramics is a polycrystalline material that contains defects such as grain boundaries, pores, impurities, and inclusions. When light passes through a ceramic material, it is opaque due to attenuation of light intensity due to reflection, absorption, and scattering. Factors affecting the light transmission properties of AlON transparent ceramics include defects such as grain boundaries, pores, second phases, impurities, and the smoothness of the ceramic surface. Therefore, setting the appropriate preparation process and parameters to prepare ceramics that are dense, free of pores ...