Combined getter

A getter, combined technology, used in thermal insulation, heat exchange equipment, pipeline protection, etc., can solve the problems of poor thermal stability, slow absorption of reducing gas, and small absorption capacity, and achieve good thermal stability and expansion. The maximum applicable temperature and the effect of reducing the influence of water vapor

Inactive Publication Date: 2012-01-04
NANJING HUADONG ELECTRONICS VACUUM MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention proposes a combined getter, the purpose of which is to overcome the inconvenient use of vacuum protection active getters in the prior art, the small absorption capacity, the poor thermal stability of the existing combined getter, Defects such as extensive use of environmentally harmful substances, complex processing of getters, low production efficiency, and slow absorption of reducing gases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1 Co-precipitation method was used to prepare an oxidizing agent with an atomic ratio of Co and Cu of 6:1, a weight percentage of Au of 2%, and a weight percentage of Pt of 0.5%.

[0018]The crystalline BaO is crushed, ball milled and passed through a sieve smaller than 500 microns, and the weight ratio of BaO to the above oxidant is 5:1 and mixed evenly. The calcium-lithium alloy is smelted in vacuum, the weight percentage of calcium and lithium is 60:40, ball milled, and passed through a sieve less than 500 microns.

[0019] Put about 1 g of the above-mentioned calcium-lithium alloy powder at the bottom of a stainless steel container, then add about 1 g of BaO powder, and finally add about 3 g of mixed powder of oxidant and barium oxide. After applying pressure to press the powder firmly, the getter is obtained. The structure of the getter is that there are three layers in the stainless steel carrier 1, wherein the surface layer is a mixture 4 of oxidant and g...

Embodiment 2

[0020] Example 2 Co-precipitation was used to prepare an oxidizing agent with an atomic ratio of Fe and Ni of 2:5, 0.5% by weight of Au, 0.5% by weight of Pt, and 2% by weight of Pd. The crystalline CaO was crushed, ball milled and passed through a screen smaller than 500 microns. The barium-magnesium alloy is smelted in vacuum, the weight percentage of barium and magnesium is 57:43, and it is milled into powder.

[0021] Put about 400 mg of the above-mentioned barium-magnesium alloy powder in a stainless steel container, and fix it with a little pressure. In another larger stainless steel container, add about 1g of the above-mentioned oxidizing agent, then put into the stainless steel container that barium-magnesium alloy is housed, finally add about 4g of calcium oxide powder. After applying pressure to press the powder firmly, it will be as figure 2 As shown in the getter, the structure of the getter is that there are three layers in the larger stainless steel carrier 5,...

Embodiment 3

[0022] Example 3 The oxidizing agent, barium-magnesium alloy powder, and calcium oxide powder in Example 2 were prepared. The weight ratio of calcium oxide powder to the oxidizing agent in the above-mentioned Example 2 is 5:1 and mixed evenly to obtain a mixed powder of oxidizing agent and calcium oxide.

[0023] Put about 1g of the above-mentioned barium-magnesium alloy powder in a stainless steel container, then add about 1g of calcium oxide powder, and finally add about 4g of the mixed powder of the above-mentioned oxidant and calcium oxide, and press the powder firmly to obtain

[0024] as image 3 As shown in the getter, the structure of the getter is that there are three layers in the stainless steel carrier 10, wherein the surface layer is a mixture 13 of the oxidant and the getter material calcium oxide, the bottom layer is the getter material barium-magnesium alloy 11; the middle layer is calcium oxide 12 (Such as image 3 shown). Compared with the prior art, the g...

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Abstract

The invention relates to a combined getter. The combined getter is characterized in that: an air suction material and an oxidant are put into a carrier to form the combined getter; the air suction material can be a precursor; the oxidant can be one or two oxides selected from iron and nickel, and 5 weight percent of one or more precious metals selected from gold, platinum and palladium can be added into the oxidant to the maximum extent so as to improve the performance of the oxidant; and the oxidant and the precious metals in the oxidant can be prepared by a precipitation method, a coprecipitation method or a mixing method. The invention has the advantages that: when metal oxides of the iron, cobalt, the nickel, copper and the like are used as the oxidant, water absorbed on the surface of the oxidant can seriously influence the reaction activity of the oxidant, but the influences of water vapor can be reduced and the reaction activity of the oxidant can be improved by adding an appropriate amount of Pd into the oxidant. When a trace amount of Au or Pt is added into the oxidant, the influences of the water vapor are greatly reduced; and the metal oxides of the iron and the nickel have higher thermal stability in vacuum, environmental harmful substances can be prevented from being used, and the highest applicable temperature of the conventional combined getter can be expanded.

Description

technical field [0001] The invention relates to a combined getter, which is used to maintain a vacuum getter device for vacuum devices such as vacuum heat insulation boards, vacuum glass, industrial dewars, and vacuum heat preservation containers, and belongs to the technical field of vacuum heat insulation. Background technique [0002] As we all know, there are three forms of heat exchange: conduction, convection, and radiation. Since vacuum can greatly reduce conduction and convection, vacuum heat insulation has good heat preservation and environmental protection performance, and has gradually been widely used in heat preservation fields such as petroleum, chemical industry, construction, refrigerators, and heat preservation cookers. [0003] In consideration of cost, heat preservation effect, and other factors such as shock resistance and light transmission, different materials are selected in different application fields to form the outer wall of the vacuum insulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06F16L59/065
Inventor 郭卫斌薛函迎柴云川
Owner NANJING HUADONG ELECTRONICS VACUUM MATERIAL
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