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Ceramic composite material based on β-eucryptite and oxide, and method of manufacturing said composite material

A composite material, eucryptite technology, applied in the field of preparation of optical structures, can solve problems such as limiting luminous ability

Inactive Publication Date: 2011-12-14
THALES SA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its modest mechanical properties severely limit its ability to emit light

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0025] With composites based on oxides (with a positive coefficient of thermal expansion) capable of sintering at temperatures below the melting point of β-eucryptite, composites showing dimensional stability compatible with space applications are readily available. It is sufficient to mix the oxide and beta-eucryptite particles and to heat the blend to a temperature at which the oxide sinters. Furthermore, by choosing oxides with a high Young's modulus and high strength, a composite with mechanical properties suitable for optical applications in the space sector, and more particularly suitable for the preparation of optical components with a diameter greater than 2 m and suitable optical structures is obtained Material.

[0026] The composite material of the present invention is a kind of material having less than 1.3×10 -6 K -1 The coefficient of thermal expansion of the composite material. The composite material of the present invention is a sintered ceramic composite ma...

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PUM

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Abstract

The composite material comprises a sintered ceramic-based oxide and microcracked beta -eucryptite crystals (lower than 55 mass%) having a grain size of greater than 6 mu m, and has a thermal dilation coefficient of lower than 1.3x 10 -> 6>K -> 6>. An independent claim is included for a process for fabricating a composite material.

Description

technical field [0001] The field of the invention is composite materials suitable for the preparation of optical components such as mirrors for space applications, and the preparation of optical structures (also called structural components) whose function is to position and support the optical components. Background technique [0002] The overall trend in space observation is to increase the diameter of mirrors for future scientific missions to observe the universe and, for example, observe the Earth from geostationary orbit. Therefore, in the near future, there will be a need for extremely stable composite materials that allow a high degree of illumination while still being rigid and strong, capable of producing Weight less than 25kg / m -2 mirror. In order to obtain dimensionally stable mirrors, composite materials for cryogenic applications such as infrared observations are sought that have a very low CTE (coefficient of thermal expansion) at about ambient temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/19C04B35/10C04B35/48C04B35/626G02B1/00
CPCC04B2235/9607C04B2235/5445C04B2235/3418C04B2235/5436G02B7/183C04B2235/3229C04B35/488C04B2235/96G02B7/181C04B2235/786C04B35/117C04B2235/3246C04B2235/3472C04B2235/442C04B35/19C04B35/4885C04B35/6263C04B2235/3203C03C10/0027G02B1/02Y10T428/24942
Inventor L·布朗沙尔G·凡托齐A·佩尔唐H·勒韦龙J·舍瓦利耶
Owner THALES SA