CN201815313U

CN201815313U - Non-evaporable getter

Info

Publication number: CN201815313U
Application number: CN201020284370XU
Authority: CN
Inventors: 朱雷
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-06
Filing date: 2010-08-06
Publication date: 2011-05-04
Anticipated expiration: 2020-08-06

Abstract

The utility model relates to a non-evaporable getter which is characterized in that the surface of barium or a barium alloy is sealed with a protective film, wherein the barium is the elementary-substance metal of barium; and the barium alloy is a barium-sodium alloy or a barium-potassium alloy or a barium-lithium alloy. The non-evaporable getter has the following advantages: since the surface of the barium or the barium alloy is sealed with the protective film, the initial temperature for the volatilization and decomposition of material forming the protective film is not lower than 10 DEG C, and the temperature the boiling point is not higher than 400 DEG C, so that the surface of the barium or the barium alloy can be prevented from contacting gas before the getter is used, and the protective film can be evapotranspired through lower heating temperature; when the surface of the barium or the barium alloy is exposed in work environment, the lower heating temperature can avoid generating evaporable barium, forming a barium film and causing short circuit between electrodes; and since the barium or the barium alloy absorbs residual reactive gases in vacuum parts through chemical reactions, and the residual reactive gases are irreversible, so that the gettering process is stable and reliable.

Description

A kind of nonevaporable getter

Technical field

The utility model relates to a kind of gettering material, especially a kind of nonevaporable getter.

Background technology

At gettering material is that mode by chemistry or physics absorbs residual activity gas in the vacuum device, nature difference according to the gettering material existence, mode of operation in vacuum device is also different, different, generally be divided into evaporable air-absorbing agent and nonevaporable getter two big classes, wherein, evaporable air-absorbing agent mainly absorbs residual activity gas in the vacuum device by chemical reaction, generally is used for kinescope, pick-up tube, oscilloscope tube, power tube etc.Nonevaporable getter mainly absorbs residual activity gas in the vacuum device by physics mode, generally is used in the electron tubes such as x light pipe, gas tube, magnetron, travelling-wave tubes, vacuum switch tube.

Early stage evaporable air-absorbing agent has barium class, strontium class, calcium class alloy.At present widely used is barium aluminium and barium titanium.BaAl wherein ₄The most reliable and the most stable, obtain the large tracts of land breathing film easily, the good reproducibility that evapotranspires can effectively absorb active gases.BaAl ₄Alloy is to be fused into ingot by barium metal and aluminium in vacuum drying oven, is processed into powder, is pressed in metal stamper or the ring and forms air suction element.It is contained in the vacuum device through high-frequency heating to 1100～1200 and ℃ makes the barium film forming of evapotranspiring.This class gettering material belongs to heat absorbing type.If at BaAl ₄In add 50% nickel powder and then become the heat release type, can make the film forming temperature of evapotranspiring drop to 800～850 ℃.For the distribution that improves the barium film, porosity and the specific area that increases the barium film, developed the aeration gettering material again, in various aeration materials,, be widely used in the kinescope with the nitrating best results.In color picture tube, also use a kind of delay nitrogen-barium getter further to control and steam the barium quality.

Non-nonevaporable getter agent commonly used has: zirconium alloy getter, zircon China ink getter, high firmness getter, cryogenic activating getter.

The zirconium alloy getter.Its nominal composition is 84%Zr one 16%Al, and alloy is by Zr ₅Al ₃, Zr ₃Al ₂, Zr ₂Multiple intermetallic compound such as Al is formed, and it is low that these spread activation energy mutually, is easy to spread in body through the gas of adsorption, thereby has bigger gettering rate and gulp capacity.It can effectively absorb H ₂, N ₂, O ₂, CO, CO ₂, H ₂O etc., best suction temperature is about 400 ℃.Be mainly used in all kinds of electron tubes, special bulb and other vacuum devices.The typical extensive application is with zirconium alloy powder and titanium amalgam (Ti ₃Hg) mixing is pressed into banded getter, is widely used in fluorescent lamp and fills in the mercury lamp, replaces traditional liquid state and fills the mercury method, can significantly reduce the mercury evil, improves fluorescent tube quality and life-span.

Zircon China ink getter.It is a kind of room temperature getter, is blended in by zirconium powder, graphite powder that sintering forms under the high temperature high vacuum.This getter porosity height, specific area is big, bond strength good, at room temperature to H ₂, N ₂, O ₂, CO, CO ₂, H ₂O isoreactivity gas has higher gettering rate and gulp capacity.Generally can be made into annular, cylindricality, sheet shape and the direct-fired heater type element of indirect, be widely used in the electron tube of all kinds of special need long term storage.

High firmness getter.It is a kind of novel room temperature gettering material, is characterized in active gases, particularly hydrogen and isotope deuterium thereof, tritium are had good pumping property.This getter bond strength height can bear high vibration frequency and acceleration condition of work, is applicable to the electron tube of working under the particular surroundings.

Cryogenic activating getter.Above-mentioned 3 kinds of nonevaporable getters must be heated to 850～900 ℃ in use and activate processing.Because its design feature can not be born 900 ℃ of high temperature, 500 ℃ of getters of various low-temp activations have therefore been developed for some vacuum device again.The general room temperature getter that activates can effectively activate at 400～900 ℃.

Because of a lot of use occasions of getter, the position that the vacuum cavity space is little not to be had the to be fit to barium that can evapotranspire, simultaneously under HTHP, the migration that is easy to evapotranspire of barium film causes the electrical leak between electrodes short circuit.Therefore, must use nonevaporable getter in this class device, it relies on the big active material integral body of specific area air-breathing, and the metallic mirror surface that do not evapotranspire out.

Barium or barium alloy are not appeared in the newspapers at present as non-nonevaporable getter agent, avoid forming the barium that evapotranspires in the work, absorb residual activity gas in the vacuum device with barium or barium alloy surface rather than the barium film that evapotranspires.

The utility model content

The purpose of this utility model is, at relying on physics mode to absorb the irreversibility that residual activity gas exists in the vacuum device in traditional non-nonevaporable getter agent work, provide a kind of novel non-nonevaporable getter agent that absorbs residual activity gas in the vacuum device by chemical reaction.

The purpose of this utility model is achieved in that a kind of nonevaporable getter, it is characterized in that: it is the elemental metals of barium that barium or barium alloy surface envelope is had layer protecting film, described barium, and described barium alloy is barium sodium alloy or barium potassium-sodium alloy or barium lithium alloy.

In the utility model: the volatilization decomposition initial temperature that forms the material of diaphragm should be more than or equal to 10 ℃, and boiling point should be less than 400 ℃;

In the utility model: described diaphragm is terpinol or low melt point paraffin.

In the utility model: described barium sodium alloy or barium potassium-sodium alloy or barium lithium alloy be shaped as ring-type or tubulose is banded or thread or sheet or spherical.

Advantage of the present utility model is: owing at barium or barium alloy surface envelope layer protecting film is arranged, the volatilization decomposition temperature that forms the material of diaphragm should be more than or equal to 10 ℃, volatilization or decomposition temperature (boiling point) should be less than or equal to 400 ℃ fully, promptly can avoid barium or barium alloy surface to contact gas before use, by lower heating-up temperature diaphragm is evapotranspired in can guaranteeing again to use, barium or barium alloy surface are exposed in the working environment, lower heating-up temperature can avoid producing the barium that evapotranspires again, form the barium film, cause interelectrode short circuit; Because residual activity gas is realized by chemical reaction in barium or the barium alloy absorption vacuum device, and is irreversible between them, breathing process is reliable and stable.

Description of drawings

Fig. 1 is an example structure schematic diagram of the present utility model.

Fig. 2 is the embodiment in the utility model practical application.Among the figure, 1, barium or barium alloy, 2, diaphragm, 3, glass, 4, supporter, 5, the vacuum pump orifice, 6, nonevaporable getter.

The specific embodiment

Accompanying drawing discloses the concrete structure of the utility model embodiment without limitation, below in conjunction with accompanying drawing embodiment of the present utility model is described further.

As seen from Figure 1, basic structure of the present utility model is: envelope has layer protecting film 2 on the surface of barium or barium alloy 1, and when specifically implementing, described barium is the elemental metals of barium, and described barium alloy is barium sodium alloy or barium potassium-sodium alloy or barium lithium alloy.The volatilization decomposition initial temperature that forms the material of diaphragm 2 should be more than or equal to 10 ℃, and boiling point should be less than or equal to 400 ℃, and for example, diaphragm 2 can adopt terpinol or low melt point paraffin.The contour structures of getter is banded or the thread or sheet of ring-type or tubulose.

In the present embodiment, described barium or barium alloy 1 adopt the elemental metals of barium, and described diaphragm 2 is a terpinol, and it is 40 ℃ that initial temperature is decomposed in its volatilization, and boiling point is 220 ℃.

During concrete enforcement, the shape of described barium sodium alloy or barium potassium-sodium alloy barium lithium alloy can be according to the spatiality in the vacuum cavity, adopts ring-type or tubulose is banded or thread or sheet or spherical.

Embodiment 2

Using method of the present utility model is: described nonevaporable getter is placed vacuum device, diaphragm is melted evapotranspire, barium or barium alloy are directly exposed, by the residual gas in the chemical reaction absorption vacuum device; The temperature of described heating is 200～450 ℃.In an application of the invention, its heating-up temperature deficiency is so that barium or barium alloy 1 forms the barium that evapotranspires, it with make the barium film forming of evapotranspiring have essential difference by high temperature (1100～1200 ℃) heating barium.

In the present embodiment, described vacuum device is a vacuum glass.The nonevaporable getter that uses is the getter that forms after the elemental metals surface of barium is covered with terpinol, and it is shaped as sphere.As seen from Figure 2, in the use, nonevaporable getter 6 is placed in the interval of adjacent supports thing 4 of layer glass 3 of vacuum glass (can establish and place the hole).Before the use; earlier nonevaporable getter 6 put areas are heated; make diaphragm melt and evapotranspire, simultaneously, by the 5 suction exhausts of vacuum pump orifice; in the process of suction exhaust; the vacuum of vacuum glass is risen, and the diaphragm that thawing can be evapotranspired is again on the other hand discharged, when the vacuum of vacuum glass reaches requirement; then stop heating, seal vacuum pump orifice 5 simultaneously.Because the diaphragm on the barium elemental metals surface of this moment is evapotranspired by thawing, and discharges vacuum chamber substantially, the barium elemental metals is exposed in the vacuum chamber, in suction condition.

During concrete the use, the adaptable vacuum device of the utility model also comprises solar energy heat collection pipe or vacuum display device or electric power vacuum switch tube or insulating utensils or oil instlated tubular or vacuum VIP plate etc., and its fixed form in vacuum device also comprises by installing or bonding or cast or compacting etc.

Claims

1. nonevaporable getter is characterized in that: it is the elemental metals of barium that barium or barium alloy surface envelope are had layer protecting film, described barium, and described barium alloy is barium sodium alloy or barium potassium-sodium alloy or barium lithium alloy.

2. a kind of nonevaporable getter according to claim 1 is characterized in that: the initial temperature that the volatilization of the material of formation diaphragm is decomposed should be more than or equal to 10 ℃, and boiling point should be less than or equal to 400 ℃;

3. a kind of nonevaporable getter according to claim 2 is characterized in that: described diaphragm is terpinol or low melt point paraffin.

4. a kind of nonevaporable getter according to claim 1 is characterized in that: described barium sodium alloy or barium potassium-sodium alloy or barium lithium alloy be shaped as ring-type or tubulose is banded or thread or sheet or spherical.