Aluminate glass, preparation thereof and application thereof

Abstract

The invention discloses an aluminate glass, a preparation method thereof and an application thereof. The aluminate glass with advantages of high stability (high temperature resistance, chemical erosion resistance and the like) and difficult crystallization is prepared through treating alumina-gallium oxide-calcium oxide as main components and barium oxide, strontium oxide, yttrium oxide, zinc oxide and antimony oxide as auxiliary components, the aluminate glass has good multispectral (from visible light to middle-infrared light) transmission performances, and the transmission performance of the aluminate glass in the middle-infrared band is especially improved, so requirements of large size infrared optical devices, such as radomes, gondolas, photoelectric windows and the like can be satisfied.

Description

technical field [0001] The invention belongs to glass and its preparation method, in particular to an aluminate glass, its preparation method and application. Background technique [0002] The infrared transmission materials currently used are mainly divided into crystal materials (such as artificial sapphire Al 2 o 3 ), polycrystalline materials (polycrystalline MgF 2 , ZnS, etc.) and infrared glass materials. Among them, infrared glass not only has good infrared transmission performance, excellent optical uniformity, and high mechanical strength, but also has low manufacturing cost, simple optical processing technology, and can be processed into products with complex shapes. The advantages of these performances and preparation costs of infrared glass materials make them become the research focus of infrared materials and lay a good foundation for a large number of applications of this type of materials. [0003] Aluminate glass is a kind of mid-infrared material with e...

AI Technical Summary

Problems solved by technology

However, the existing aluminate glass has low transmittance in the mid-infrared band (3-5 μm), and the image is not clear when used in infrared detection and ranging windows, which limits its application.

[0004] On the other hand, due to the absence of traditional network formers (such as SiO 2 , B 2 o 3 ,P 2 o 5 etc.), the formation area of ​​aluminate glass is narrow, the glass-forming property is poor, and it is difficult to prepare large-sized samples

In order to improve the glass-forming properties of aluminate glass, researchers have optimized its components: (1) adding a small amount of network former SiO 2 It can significantly improve the formation ability of aluminate glass, but due to the high phonon energy of Si-O, the infrared cut-off wavelength of the glass is purple-shifted; (2) adding GeO 2 The glass former can improve the glass forming ability without affecting the infrared properties of the aluminate glass, but reduces the hardness of the glass; (3) adding a small amount of alkaline earth metal can improve the forming ability of the aluminate glass, and the effect of BaO is the most Good, but adding too much will intensify crystallization

In short, the existing aluminate glass has poor thermal stability and is prone to crystallization

The crystallization of aluminate glass greatly limits its preparation, especially the preparation of large-sized glasses. Once crystallization occurs, the optical and mechanical properties of the glass will be destroyed.

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