Pressing suction element with powder falling prevention device and preparation method for suction element

A component and anti-dropping technology, which is applied in the field of electric vacuum getter element preparation, can solve the problems of inability to meet the requirements of electric vacuum devices, decrease in strength performance of elements, decrease in element getter performance, etc., and achieve excellent getter performance and low forming pressure. , a wide range of effects

Active Publication Date: 2012-07-04
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The general situation is to increase the forming pressure of the component, and increasing the sintering temperature of the component will increase the overall strength of the component, but the porosity of the getter component will decrease, and the getter performance of the component will also decrease. Conversely, reduce the forming pressure of the component or reduce it appropriately The sintering temperature, the porosity of the getter element is guaranteed, that is, the getter performance of the element is guaranteed, but the strength performance of the element will decrease accordingly
Therefore, the getter components prepared by this process will have getter particles falling off when used under vibration conditions, which cannot meet the requirements of electric vacuum devices working under special conditions.

Method used

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  • Pressing suction element with powder falling prevention device and preparation method for suction element
  • Pressing suction element with powder falling prevention device and preparation method for suction element
  • Pressing suction element with powder falling prevention device and preparation method for suction element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Such as figure 2 As shown, take a 0.15mm thick pure nickel sheet and punch it into a dish-shaped container 2 with an outer edge. The diameter of the outer edge is Φ12mm, the diameter of the container mouth is Φ10mm, and the depth of the container is 2mm. The length of ° is 5mm and the width is two support bars of 1.5mm.

[0049] Such as figure 1 As shown, a pure molybdenum sheet with a thickness of 0.02mm is selected, and the pure molybdenum porous net is prepared into a disc shape of Φ11.6mm. The edge of the disc is a metal ring with a width of 0.8mm, and the diameter of the porous net 1 is Φ10mm. The pore size is 30 μm.

[0050] Binder preparation: Dissolve 100g of Canadian gum in 1000ml of absolute ethanol, and place it for 12h to prepare a thick binder solution.

[0051] Such as image 3 As shown, take -200 mesh to +300 mesh ZrVFe alloy powder, mix it with the binder solution at a weight ratio of 9:1 to prepare a getter alloy powder mixed with a binder, and add...

Embodiment 2

[0055] The operating method and process conditions are basically the same as those in Example 1, except that the only difference is that the particle size of the ZrVFe powder used in Example 2 is -300~+400 mesh. The air-absorbing element with the anti-powder dropping device prepared in Example 2 was tested for air-absorbing performance according to national standards. The activation temperature was 500°C, and the holding time was 10 minutes. The air-absorbing performance was tested, and the air-absorbing rate at room temperature was S 10 =1353ml / s·g, the total amount of inspiration in 30min is 1083Pa·ml / g. Vibration test on the suction element with a frequency of 60Hz, an amplitude of 1.2mm, and a time of 60min. After vibration, check under a magnifying glass of 5 times that there is no powder falling off.

Embodiment 3

[0057] The operating method and process conditions are basically the same as those in Example 1, except that the only difference is that the average pore diameter of the porous mesh used in Example 3 is 40 μm. The air-absorbing element with the anti-powder dropping device prepared in Example 3 was tested for air-absorbing performance according to national standards. The activation temperature was 500°C, and the holding time was 10 minutes. The air-absorbing performance was tested, and the air-absorbing rate at room temperature was S 10 =1246ml / s·g, the total amount of inhalation in 30min is 1027Pa·ml / g. Vibration test on the suction element with a frequency of 60Hz, an amplitude of 1.2mm, and a time of 60min. After vibration, check under a magnifying glass of 5 times that there is no powder falling off.

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Abstract

The invention relates to a pressing suction element with a powder falling prevention device and a preparation method for the suction element. The suction element is prepared by pressing and sintering at the bottom in a disc-shaped container to form a non-evaporable getter powder layer, fixedly connecting a layer of porous net to a container opening of the disc-shaped container, and sealing the container opening of the disc-shaped container. The preparation method comprises the following steps of: (a) stamping a pure metal sheet to form the disc-shaped container; (b) preparing a 90 to 110g / l Canada balsam solution; (c) pressurizing to ensure that a mixture of getter powder and a binder is pressed in the disc-shaped container; (d) removing the binder, and performing vacuum sintering; (e) preparing the porous net; and (f) firmly welding the porous net with the container opening of the disc-shaped container to prepare the pressing suction element with the powder falling prevention device. The suction element ensures that powder particles do not fall in the storage, transportation and using processes due to the protection of the porous net, and the work safety and reliability of an electronic vacuum device are improved.

Description

technical field [0001] The invention belongs to the technical field of preparation of electric vacuum suction components, and in particular provides a compressed suction component with a powder drop prevention device and a preparation method thereof. Background technique [0002] The getter element is an indispensable and important component in all kinds of electric vacuum devices. Its main function is to absorb the residual gas in the vacuum device and the gas re-released from the components in the device during the aging and screening process of the electric vacuum device; During the storage and operation of the electric vacuum device, maintain a certain degree of vacuum in the electric vacuum device; absorb the gas released explosively when the electric vacuum device starts up and works abnormally. Practice has proved that in order to obtain high-performance and long-life electric vacuum devices, high-quality getter components must be guaranteed. The main features of hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J9/39B22F3/16
Inventor 张艳尉秀英毛昌辉李腾飞苑鹏杜军杨志民
Owner GRIMAT ENG INST CO LTD
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