EP0509971B1 - Verfahren zur Sorption von Restgasen, insbesondere von Stickstoff mittels eines nichtverdampfbaren Bariumgetters - Google Patents
Verfahren zur Sorption von Restgasen, insbesondere von Stickstoff mittels eines nichtverdampfbaren Bariumgetters Download PDFInfo
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- EP0509971B1 EP0509971B1 EP92830186A EP92830186A EP0509971B1 EP 0509971 B1 EP0509971 B1 EP 0509971B1 EP 92830186 A EP92830186 A EP 92830186A EP 92830186 A EP92830186 A EP 92830186A EP 0509971 B1 EP0509971 B1 EP 0509971B1
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- alloy
- sorption
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- vessel
- gas
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- 239000007789 gas Substances 0.000 title claims description 74
- 238000001179 sorption measurement Methods 0.000 title claims description 44
- 238000000034 method Methods 0.000 title claims description 41
- 230000008569 process Effects 0.000 title claims description 38
- 229910052788 barium Inorganic materials 0.000 title claims description 34
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 title claims description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title description 33
- 229910001873 dinitrogen Inorganic materials 0.000 title description 3
- 229910045601 alloy Inorganic materials 0.000 claims description 71
- 239000000956 alloy Substances 0.000 claims description 71
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 239000011575 calcium Substances 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 15
- 229910052749 magnesium Inorganic materials 0.000 claims description 12
- 239000011777 magnesium Substances 0.000 claims description 12
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 9
- 229910052791 calcium Inorganic materials 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 230000000737 periodic effect Effects 0.000 claims description 6
- 239000004411 aluminium Substances 0.000 claims description 5
- 229910052712 strontium Inorganic materials 0.000 claims description 5
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims description 5
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 4
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 18
- 239000012298 atmosphere Substances 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 16
- 229910052757 nitrogen Inorganic materials 0.000 description 15
- 230000004927 fusion Effects 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000463 material Substances 0.000 description 11
- 229910052786 argon Inorganic materials 0.000 description 9
- 230000006698 induction Effects 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 9
- 239000000203 mixture Substances 0.000 description 9
- 230000001681 protective effect Effects 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 238000005247 gettering Methods 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002429 nitrogen sorption measurement Methods 0.000 description 5
- 229910000733 Li alloy Inorganic materials 0.000 description 4
- 230000004913 activation Effects 0.000 description 4
- 239000012300 argon atmosphere Substances 0.000 description 4
- 239000001989 lithium alloy Substances 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 229910016015 BaAl4 Inorganic materials 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 3
- COHCXWLRUISKOO-UHFFFAOYSA-N [AlH3].[Ba] Chemical compound [AlH3].[Ba] COHCXWLRUISKOO-UHFFFAOYSA-N 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 3
- 238000001275 scanning Auger electron spectroscopy Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- QFAXEJRYQFPRJW-UHFFFAOYSA-N [Li].[Ca].[Ba] Chemical compound [Li].[Ca].[Ba] QFAXEJRYQFPRJW-UHFFFAOYSA-N 0.000 description 2
- YSZKOFNTXPLTCU-UHFFFAOYSA-N barium lithium Chemical compound [Li].[Ba] YSZKOFNTXPLTCU-UHFFFAOYSA-N 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910000600 Ba alloy Inorganic materials 0.000 description 1
- 229910016069 BaSn2 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910003023 Mg-Al Inorganic materials 0.000 description 1
- 229910003310 Ni-Al Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 229910007727 Zr V Inorganic materials 0.000 description 1
- 229910007837 Zr—V—Ni Inorganic materials 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- -1 barium-lithium-aluminium Chemical compound 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 229910052733 gallium Inorganic materials 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910000986 non-evaporable getter Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
- H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
- H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
- H01J7/183—Composition or manufacture of getters
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C24/00—Alloys based on an alkali or an alkaline earth metal
Definitions
- the barium-aluminium (about 50% Ba) alloy is mixed with, preferably, 15% by weight of powdered tin to produce getters.
- Said getters are heated by means of high frequency electrical induction to about 600°C for one minute during the exhaust process.
- BaSn 2 may be produced, or liberated barium is produced, from the barium-aluminium alloy by reaction of aluminium and tin.
- a mixed getter material of barium-aluminium alloy and tin which is stable at a normal temperature is activated and absorb gases at a normal temperature. Nevertheless there is a heating process involved which requires temperatures of several hundreds of degrees centigrade. Furthermore an uncontrolled chemical reaction is taking place.
- Lithium organic resins have been proposed for the sorption of gas impurities from impure gas streams, but they are used for the purification of nitrogen gas and not for its sorption, see US-A-4,603,148 and US-A-4,604,270.
- non-evaporated getters can be introduced into the device in a pre-activated form, that is when they have already been heated to a high temperature of about 600°C, they have already been subjected to many manufacturing processes such as grinding to fixed particle size, mixing with other materials, compaction or forming into pellets.
- a further object of the present invention to provide a process for the sorption of unwanted gas in a vessel which does not require temperatures of greater than 150°C.
- Yet a further object of the present invention is to provide a process for the sorption of nitrogen gas in a vessel made of organic plastic or which contains organic plastic.
- the process of the present invention provides for the sorption of residual gas in a vessel by means of a non-evaporated barium getter. It comprises the steps of reducing an alloy of Ba 1-x A x Li 4-y B y , preferably to a particle size of less than 5mm, under vacuum or an inert gas atmosphere and then placing the reduced alloy in the vessel. Upon exposing the reduced alloy to the residual gas in the vessel at a temperature of less than 150°C the gas is sorbed.
- the metal A is a metal chosen from the group consisting of elements of Group IIa of the periodic table of elements, excluding barium.
- the metal B is chosen from the group consisting of elements of Group IIIa of the periodic table of elements and magnesium.
- the alloys of the present invention do not have to be activated, that is they are already capable of sorbing gases at room temperature and furthermore they do not have to be evaporated to produce a film of active material, such as barium before they sorb gas. Nevertheless they can be activated by heating to a temperature of not greater than 150°C. This could be between 50°C and 150°C for at least 10 minutes and then reducing the temperature to less than 50°C.
- the alloys can be described by the general formula Ba 1-x A x Li 4-y B y , where A is a metal chosen from the group consisting of elements of Group IIa of the periodic table of elements, excluding barium. The numbering of the Groups of elements is that adopted by The American Chemical Society.
- A can be calcium, magnesium and strontium but is preferably calcium as calcium is only slightly less reactive than barium. Magnesium and strontium are less preferred for their lower reactivity.
- the value of x may be as low as zero such that there is no metal of Group IIa present (except the barium). On the other hand it may be as high as 0.8. Above about 0.8 the alloy begins to lose its ability to react at room temperature with the residual gas at a sufficiently high sorption speed.
- the element B is any metal chosen from the group consisting of elements Group IIIa of the periodic table of elements and magnesium. All members of Group IIIa can be adopted, for instance boron, but aluminium is preferred as it is readily available, it has a relatively high melting point and is extremely cheap, while gallium is liquid near ambient temperatures. Indium has a low melting point and is more expensive then aluminium. Tl is highly toxic. Furthermore 0 ⁇ y ⁇ 3.5.
- These compounds can be easily comminuted or reduced to a particulate form without any difficulty. For instance they can be reduced to a particle size of less than 5 mm in diameter, and preferably less than 1 mm, by known techniques under a vacuum or inert atmosphere and then transferred to the vessel containing the unwanted gas which is desired to be removed. This is accomplished by placing the reduced alloy in the vessel and exposing the reduced alloy to the residual gas at room temperature.
- the reduced alloy can be transferred to the vessel immediately but preferably takes place by means of an intermediate vessel in which the alloy is stored under vacuum or an inert atmosphere until it is required.
- FIG. 1 is a drawing showing in a schematic form an apparatus 100 for measuring the sorptive properties of Ba 1-x A x Li 4-y B y alloys useful in the present invention.
- a vacuum pumping system 102 is connected by means of a first valve 104 to a dosing volume 106.
- dosing volume 106 Connected with dosing volume 106 there is a series of second valves 110, 110', 110'' for the inlet of test gases from a series of test gas reservoirs 112, 112', 112'', containing N2, artificial air, and CO respectively, and a pressure measuring gauge 114.
- To dosing volume 106 is also connected, by third valve 116, a test chamber 118 containing the sample 120 under test.
- valves 110, 110', 110'' and 116 are closed and 104 is opened and the vacuum pump system 102 pumped the system down to 10 ⁇ 6 mbar.
- the dosing volume 106 was a volume of 0.71 litre.
- Valve 116 was opened and again the system was pumped down to 10 ⁇ 6 mbar while the sample was held at about 100°C for 20 minutes which simulates a process to which the getter may be subject.
- Valves 104 and 116 were then closed and test gas was admitted to dosing volume 106, from gas reservoir 112, (112', 112'') by opening valve 110 (110', 110'') for a short while.
- the pressure was noted on pressure gauge 114, and was arranged to be such that the pressure was about 0.4-1.0 mbar after opening valve 116 to introduce a dose of test gas to the sample 120.
- This example was designed to show how to manufacture an alloy useful in the process of the present invention.
- the alloy corresponds to the intermetallic compound BaLi4.
- This example was designed to show the use of an alloy in the process of the present invention.
- a barium-lithium alloy as prepare in Example 2 above was placed in a glove-box under a protective atmosphere of argon at slightly greater than 1 atmosphere pressure.
- the alloy was ground using a mortar and pestle to a particle size of less than 1mm and a sample of 2.7 g was sealed in a glass vessel of volume 0.17 litre.
- the sample in the glass vessel was then attached as test chamber 118 to the test apparatus of Example 1.
- the procedure of Example 1 was followed and a first dose of gas, in this case nitrogen (from reservoir 112 by means of valve 110), was introduced to the sample.
- the pressure in the vessel was measured by means of pressure gauge 114 as a function of time.
- the curve obtained is reported on Fig. 2 as curve 1.
- the sorption was so rapid that the pressure drop was almost instantaneous.
- a second dose of nitrogen was introduced and the pressure in the vessel as measured by the pressure gauge 114 was reported as curve 2 on Fig. 2.
- the gas was replaced by artificial air, that is a mixture of 80% v/v N2 + 20% v/v O2 (from reservoir 112' by means of valve 110') and the pressure in the vessel was recorded as curve 3 on Fig. 3. This was repeated to give curve 4.
- the gas was replaced by CO (from reservoir 112'' by means of valve 110'') and the pressure in the vessel was recorded as curve 5 for which the sorption was so rapid that the pressure drop was almost instantaneous. Artificial air was again introduced to give curve 6.
- the sample was then cooled to 0°C and on introducing a sample of N2 gas curve 7 was recorded.
- the sample was then cooled to about -8°C to -9°C with a bath of alcohol + iced water and on introducing a dose of nitrogen curve 8 was recorded.
- Fig. 6 shows the gas sorption speed derived from the curves of Figs. 2-5, by differentiation, as a function of gas sorbed.
- This example was designed to show how to manufacture another alloy, by partial replacement of barium by calcium, useful in the process of the present invention.
- the crucible was placed in an induction furnace and heated under an argon atmosphere of 400 mbar with medium frequency induction heating until the mixture was thoroughly melted and homogeneous thus forming a fusion.
- the fusion was then poured into a cold iron mould and allowed to cool to room temperature while still under the protective atmosphere of argon.
- the weight of alloy after fusion was 138 g.
- the alloy corresponds to the composition Ba 0.75 Ca 0.25 Li4.
- This example was designed to show the use of the alloy produced as in Example 4 in the process of the present invention.
- a barium-calcium-lithium alloy as prepared in Example 4 above was placed in a glove box under a protective atmosphere of argon at slightly greater than 1 atmosphere pressure.
- the alloy was ground to a particle size of less than 1 mm with a pestle and a mortar and a sample of 2.0 g was sealed in a glass vessel of volume 0.32 litre.
- the sorption properties were measured as in Example 3 for N2 at 25°C and are reported as curves 1-14 in Figs. 7-9.
- Fig. 10 shows the nitrogen sorption speed derived from the curves of Figs. 7-9, by differentiation, as a function of nitrogen sorbed.
- This example was designed to show how to manufacture another alloy, by replacement of more barium by calcium, useful in the process of the present invention.
- the alloy corresponds to a composition Ba 0.5 Ca 0.5 Li4.
- This example was designed to show- the use of the alloy produced as in Example 6 in the process of the present invention.
- a barium-calcium lithium alloy as prepared in Example 6 above was placed in a glove box under a protective atmosphere of argon at slightly greater than 1 atmosphere pressure.
- the alloy was ground to a particle size of less than 1 mm with a pestle and mortar and a sample of 2.47 g was sealed in a glass vessel of volume 0.15 litre.
- the sorption properties were measured for nitrogen at 25°C as in Example 3, and are reported as curves 1-28 in Figs. 11-15.
- Fig. 16 shows the gas sorption speed derived from the curves of Figs. 11-15 as a function of quantity of gas sorbed.
- the crucible was placed in an induction furnace and heated under an argon atmosphere of 400 mbar with medium frequency induction heating until the mixture was thoroughly melted and homogeneous thus producing a fusion.
- the fusion was then poured into a cold iron mold and allowed to cool to room temperature while still under the protective atmosphere of argon.
- the weight of alloy after fusion was 78.3 g.
- the alloy corresponds to the composition BaLi3Al.
- This example was designed to show the use of the alloy produced as in Example 8 in the process of the present invention.
- a barium-lithium-aluminium alloy as prepared in Example 8 above was placed in a glove box under a protective atmosphere of argon at slightly greater than 1 atmosphere pressure.
- the alloy was ground to a particle size of less than 1 mm with a pestle and a mortar and a sample of 2.4 g was sealed in a glass vessel of volume 0.32 litre.
- the sorption properties were measured as in Example 3 for N2 at 25°C and are reported as curves 1-7 in Figs. 17-18.
- Fig. 19 shows the gas sorption speed derived from the curves of Figs. 17-18, by differentiation, as a function of gas sorbed.
- This example was designed to show the N2 sorption properties of a prior art alloy.
- a low temperature activatable non-evaporated of 70% Zr - 24.6% V - 5.4% Fe (nominal weight composition) of weight 100 mg was activated by heating to 450°C for 10 minutes under vacuum at better than 10 ⁇ 3 mbar and then caused to sorb N2 at 25°C at a pressure of about 10 ⁇ 5 mbar in an apparatus described in the ASTM F798-82 Standard Practice for Determining Gettering Rate, Sorption Capacity, and Gas Content of Nonevaporable Getters in the Molecular Flow Region.
- the gettering rate (sometimes called sorption speed) was plotted against the quantity sorbed, for the equivalent 2g getter, to give curve A on Fig. 20.
- This example was designed to show the N2 sorption properties of an alloy according to the present invention.
- a barium-lithium alloy as prepared in Example 2 above was prepared and 2g, having a particle size of less than 1mm, was placed in the same ASTM apparatus used for Example 10. After being held at a temperature of 100°C for 15-20 minutes, which simulates a process to which the getter may be subjected the getter was cooled to 25°C and its curve of nitrogen sorption was plotted as curve C on Fig. 20. After the getter had sorbed a quantity of gas the flow was interrupted. On continuing, the curve C' was obtained, and successively with curves C'' and C'''.
- Example 11 was repeated except that the getter was activated at a temperature of 130°C for 3 hours followed by 100°C for 16 hours and the getter was held at 80°C while sorbing nitrogen.
- Figs. 6, 10, 16 and 19 show a remarkable ability for the large quantities of N2 and other gases sorbed.
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
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Claims (14)
- Verfahren zur Sorption von Rückstandsgas in einem Behälter durch nicht-verdampftes Bariumgetter, umfassend die Schritte:i) Reduzieren einer Legierung Ba1-xAxLi4-yBy zu Teilchen unter einem Vakuum- oder Inertgas zur Erzeugung einer reduzierten Legierung;ii) Einsetzen der reduzierten Legierung in einen Behälter;iii) Aussetzen der reduzierten Legierung einem Rückstandsgas bei einer Temperatur von weniger als 150 °C,
wobeiA ein Metall ist, ausgewählt aus der Gruppe bestehend aus den Elementen der Gruppe IIa des periodischen Systems der Elemente, ausgenommen Barium,B ein Metall ist, ausgewählt aus der Gruppe, bestehend aus den Elementen der Gruppe IIIa des periodischen Systems der Elemente und Magnesium,mit - Verfahren nach Anspruch 1, bei dem der Schritt iii) das Aussetzen der reduzierten Legierung einem Rückstandsgas bei einer Temperatur zwischen 50 und 150 °C für wenigstens 10 Minuten einschließt und dann Absenken der Temperatur auf unter 50 °C.
- Verfahren nach Anspruch 1, bei dem A ein Metall ist, ausgewählt aus der Gruppe bestehend aus Magnesium, Calcium und Strontium.
- Verfahren nach Anspruch 1, bei dem B ein Metall aus der Gruppe bestehend aus Bor, Aluminium und Magnesium ist.
- Verfahren nach Anspruch 1, bei dem 0 ≦ x ≦ 0,5 ist.
- Verfahren nach Anspruch 1, bei dem das nicht verdampfte Bariumgetter die Legierung BaLi₄ umfasst.
- Verfahren nach Anspruch 1, bei dem das nicht verdampfte Bariumgetter die Legierung Ba0,75Ca0,25Li₄ umfasst.
- Verfahren nach Anspruch 1, bei dem das nicht verdampfte Bariumgetter die Legierung Ba0,5Ca0,5Li₄ umfasst.
- Verfahren nach Anspruch 1, bei dem das nicht verdampfte Bariumgetter die Legierung BaLi₃Al umfasst.
- Verfahren nach Anspruch 1, bei dem die reduzierte Legierung eine Teilchengröße von weniger als 5 mm hat.
- Verfahren nach Anspruch 10, bei dem die reduzierte Legierung eine Teilchengröße von weniger als 1 mm hat.
- Verfahren zur Sorption von Rückstandsgas in einem Behälter durch ein nicht verdampftes Bariumgetter, umfassend die Schritte:i) Zerkleinern einer Legierung Ba1-xAxLi4-yBy zu Teilchen in Abwesenheit von reaktiven Gasen zur Erzeugung einer gekörnten Legierung;ii) Einsetzen der gekörnten Legierung in einen Behälter; undiii) Aussetzen der zerkleinerten Legierung zu einem Rückstandsgas bei einer Temperatur von weniger als 150 °C; wobei:"A" ein Metall ist, ausgewählt aus der Gruppe bestehend aus Magnesium, Calcium und Strontium;"B" ein Metall ist, ausgewählt aus der Gruppe bestehend aus Bor, Aluminium und Magnesium;"x" einen Wert von 0 bis 0,8 hat; und"y" einen Wert von 0 bis 3,5 hat.
- Verfahren zur Sorption von Rückstandsgasen in einem Behälter durch nicht verdampftes Bariumgetter, umfassend die Schritte:i) Zerkleinern einer Legierung von BaLi₄ zu Teilchen in Abwesenheit von reaktiven Gasen zur Erzeugung einer gekörnten Legierung;ii) Einsetzen der gekörnten Legierung in einen Behälter; undiii) Aussetzen der gekörnten Legierung Zu einem Rückstandsgas bei einer Temperatur von unter 150 °C.
- Verfahren zur Sorption von Rückstandsgasen bei Temperaturen von weniger als 150 °C in einem geschlossenen Behälter, dessen innere Wände frei einem Bariumfilm sind, durch Kontaktieren der Rückstandsgase mit der gekörnten Legierung Ba1-xAxLi4-yBy, wobei die gekörnte Legierung eine Teilchengröße von weniger als 5 mm hat; Sorption der Rückstandsgase tritt auf an der Oberfläche der Teilchen; und"A" ein Metall ist, ausgewählt aus der Gruppe, bestehend aus Magnesium, Calcium und Strontium;"B" ein Metall ist, ausgewählt aus der Gruppe, bestehend aus Bor, Aluminium und Magnesium;"x" einen Wert von 0 bis 0,8 hat; und"y" einen Wert von 0 bis 3,5 hat.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI911038 | 1991-04-16 | ||
ITMI911038A IT1246786B (it) | 1991-04-16 | 1991-04-16 | Processo per l'assorbimento di gas residui, in particolare azoto, mediante una lega getter a base di bario non evaporato. |
CN92109723.9A CN1036703C (zh) | 1991-04-16 | 1992-08-24 | 吸收残余气体的方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0509971A1 EP0509971A1 (de) | 1992-10-21 |
EP0509971B1 true EP0509971B1 (de) | 1995-09-27 |
Family
ID=36790877
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92830186A Expired - Lifetime EP0509971B1 (de) | 1991-04-16 | 1992-04-16 | Verfahren zur Sorption von Restgasen, insbesondere von Stickstoff mittels eines nichtverdampfbaren Bariumgetters |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0509971B1 (de) |
JP (1) | JP2627703B2 (de) |
CN (1) | CN1036703C (de) |
DE (1) | DE69205050T2 (de) |
IT (1) | IT1246786B (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2102650C1 (ru) * | 1992-11-09 | 1998-01-20 | Саес Геттерс С.П.А. | Термоизолирующий кожух криогенного устройства |
US12281896B2 (en) | 2022-09-15 | 2025-04-22 | Honeywell International Inc. | Stabilized evaporable getter for increased handleability |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMI20012273A1 (it) * | 2001-10-29 | 2003-04-29 | Getters Spa | Leghe e dispositivi getter per l'evaporazione del calcio |
WO2006075680A1 (ja) * | 2005-01-14 | 2006-07-20 | Matsushita Electric Industrial Co., Ltd. | 気体吸着性物質、気体吸着合金および気体吸着材 |
JP5061289B2 (ja) * | 2005-03-25 | 2012-10-31 | パナソニック株式会社 | 気体吸着性物質および気体吸着材 |
JP4889947B2 (ja) * | 2005-01-14 | 2012-03-07 | パナソニック株式会社 | 気体吸着合金 |
ITMI20051500A1 (it) * | 2005-07-29 | 2007-01-30 | Getters Spa | Sistemi getter comprendenti una fase attiva inserita in un materiale poroso distribuito in un mezzo disperdente permeabile |
EP1791151A1 (de) * | 2005-11-29 | 2007-05-30 | Nanoshell Materials Research & Development GmbH | Metallische Gassorptionsmitteln auf Lithiumlegierungsbasis |
CN101890328A (zh) * | 2010-08-06 | 2010-11-24 | 朱雷 | 一种非蒸散型吸气剂及其应用 |
CN103370120B (zh) | 2011-02-14 | 2016-01-20 | 松下知识产权经营株式会社 | 气体吸附器件和具备该气体吸附器件的真空隔热件 |
CN102258975A (zh) * | 2011-05-03 | 2011-11-30 | 济南桑乐真空管有限公司 | 一种全玻璃太阳能真空集热管高效蒸散型合金吸气剂 |
DE102012110083B4 (de) | 2012-10-23 | 2014-12-11 | Gabriele Uslenghi | Verfahren zur Herstellung von Vakuumisolierglas |
US10421059B2 (en) | 2014-10-24 | 2019-09-24 | Samsung Electronics Co., Ltd. | Gas-adsorbing material and vacuum insulation material including the same |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB387724A (en) * | 1931-07-04 | 1933-02-06 | Osborg Hans | Improvements in scavengers or improvers for use in the treatment of molten metals and alloys |
US2706554A (en) * | 1952-05-12 | 1955-04-19 | King Lab Inc | Getter assembly |
US3193508A (en) * | 1962-07-13 | 1965-07-06 | Union Carbide Corp | Silicon-containing barium-aluminum getter material |
IT1206459B (it) * | 1984-07-05 | 1989-04-27 | Getters Spa | Dispositivo getter atto a ridurre il metano nei gas residui in un tubo a vuoto. |
US4717500A (en) * | 1985-11-27 | 1988-01-05 | Union Carbide Corporation | Getter device for frit sealed picture tubes |
-
1991
- 1991-04-16 IT ITMI911038A patent/IT1246786B/it active IP Right Grant
-
1992
- 1992-04-15 JP JP4119832A patent/JP2627703B2/ja not_active Expired - Fee Related
- 1992-04-16 EP EP92830186A patent/EP0509971B1/de not_active Expired - Lifetime
- 1992-04-16 DE DE69205050T patent/DE69205050T2/de not_active Expired - Fee Related
- 1992-08-24 CN CN92109723.9A patent/CN1036703C/zh not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU2102650C1 (ru) * | 1992-11-09 | 1998-01-20 | Саес Геттерс С.П.А. | Термоизолирующий кожух криогенного устройства |
US12281896B2 (en) | 2022-09-15 | 2025-04-22 | Honeywell International Inc. | Stabilized evaporable getter for increased handleability |
Also Published As
Publication number | Publication date |
---|---|
JPH05131134A (ja) | 1993-05-28 |
EP0509971A1 (de) | 1992-10-21 |
DE69205050T2 (de) | 1996-03-07 |
IT1246786B (it) | 1994-11-26 |
DE69205050D1 (de) | 1995-11-02 |
ITMI911038A0 (it) | 1991-04-16 |
JP2627703B2 (ja) | 1997-07-09 |
ITMI911038A1 (it) | 1992-10-16 |
CN1036703C (zh) | 1997-12-17 |
CN1083413A (zh) | 1994-03-09 |
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