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Non-evaporable getter compositions which can be reactivated at low temperature after exposure to reactive gases at a higher temperature

A technology of getter and composition, applied in electrical components, thin material processing, discharge tubes, etc., can solve the problem of limited ability to reactivate other gases

Active Publication Date: 2014-06-04
SAES GETTERS SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even though these mixtures have been found to be fully reactivatable in terms of carbon monoxide adsorption properties, these mixtures have limited ability to be reactivated to absorb other gases such as hydrogen

Method used

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  • Non-evaporable getter compositions which can be reactivated at low temperature after exposure to reactive gases at a higher temperature

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0030] A sample of the composition according to the invention was prepared by mixing the powder of the high activation temperature alloy Zr86%-Al14%wt with the powder of the low activation temperature alloy Zr70%-Fe15%-Y15%wt in a ratio of 2:3; alloy, the particle size of the powder is included between 0 μm and 125 μm. Then use about 4000Kg / cm in a suitable ring container 2 120 mg of the mixture was squeezed, and the sample was heated at 420° C. in air for about 1 minute.

[0031] After activating at 400°C for 1 minute, the final product was used under static conditions at a volume of about 5000 cm 3 (also referred to as "cubic centimeters", or "cc") in the aspirating chamber with a dose of hydrogen at an initial pressure of 0.133 hPa to perform on samples at 400 °C for H 2 adsorption test.

example 2

[0033] A sample of the composition according to the invention was prepared by mixing the powder of the high activation temperature alloy Zr76%-Ni24%wt with the powder of the low activation temperature alloy Zr70%-Fe15%-Y15%wt in a ratio of 2:3; alloy, the particle size of the powder is included between 0 μm and 125 μm. Samples were then prepared and tested according to Example 1.

example 3

[0035] The composition according to the invention is prepared by mixing powder of high activation temperature alloy Zr79.2%-Ni21.8%wt with powder of low activation temperature alloy Zr70%-Fe15%-Y15%wt in a ratio of 2:3 Samples; powders with particle sizes comprised between 0 μm and 125 μm for both alloys. Samples were then prepared and tested according to Example 1.

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Abstract

Compositions containing a mixture of non-evaporable getter alloys are described which, after having lost their functionality in consequence of the exposure to reactive gases at a first temperature, can then be reactivated through a thermal treatment at a second temperature that is lower than the first one.

Description

technical field [0001] The present invention relates to a composition comprising a non-evaporable getter alloy which, after losing its function due to exposure to a reactive gas at a first temperature, can be passed through heat treatment at a second temperature lower than the first temperature And reactivation. Background technique [0002] Non-evaporable getter alloys (also known as NEG alloys) are capable of reversibly adsorbing hydrogen and, for some alloys, irreversibly adsorbing gases such as oxygen, water, carbon oxides, hydrocarbons, and nitrogen. [0003] These alloys are used in many industrial applications where a vacuum needs to be maintained in a sealed system. Examples of these applications are: particle accelerators, X-ray generating tubes, displays constructed from cathode ray tubes or CRTs, field emission type flat panel displays (called FEDs), vacuum jackets for thermal insulation (e.g. in vacuum flasks (thermos) Vacuum jackets used in applications), Dewa...

Claims

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Application Information

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IPC IPC(8): H01J7/18
CPCH01J7/183B01J20/28004B01J20/02Y10T428/12014
Inventor 阿莱西奥·科拉扎亚历山德罗·加利托格诺塔温琴佐·马萨罗
Owner SAES GETTERS SPA
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