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Non-radiative multi-component composite tungsten negative material for microwave oven magnetron and preparation process of negative material

A multi-component compound, tungsten cathode technology, applied to the cathode of the time-of-flight electronic tube, etc., can solve the problems of increasing manufacturing costs, adverse effects on human health, and environmental pollution

Inactive Publication Date: 2014-06-11
深圳市威勒科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the electron emission function of the cathode, thorium oxide is added to the pure tungsten material, but the cathode product made of this composite material has a high brittle-plastic transition temperature, difficult processing and forming, and a low recrystallization temperature, resulting in The cathode of the magnetron breaks uncontrollably during production, transportation and use, resulting in failure of the magnetron
Seriously affect the reliability of the product and increase the manufacturing cost
In addition, thorium is a radioactive element, and thorium is used as the main raw material. During the process of smelting, production, transportation and use, it will pollute the environment. Thorium has a half-life of 1.39X10 10 Years, it is also difficult to recycle, and its scrapped products pose a pollution threat to the environment. China currently undertakes 100% of the world’s production of magnetrons for microwave ovens. As an extremely important rare earth strategic resource, thorium can be used for clean energy nuclear power manufacturing. Therefore, from resources Considering the rational use of thoriated magnetrons in microwave ovens, it has become an important research topic in this field to provide a tungsten cathode that can replace the existing thoriated magnetron.

Method used

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  • Non-radiative multi-component composite tungsten negative material for microwave oven magnetron and preparation process of negative material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 19.93g of lanthanum nitrate, 26.13g of zirconium nitrate, 25.44g of yttrium nitrate, 14.28g of lutetium nitrate, and 64.82g of ammonium rhenate powder to form a mixed solution, add 1778.0g of tungsten trioxide powder, fully stir and evaporate to dryness and dry , first reducing by passing hydrogen for 45 minutes in an environment with a temperature of 400°C, and then reducing by passing hydrogen for 45 minutes in an environment with a temperature of 700°C to obtain a mixed powder that meets the requirements and has good processability.

[0027] Wash the above-mentioned reduced mixed powder with hydrochloric acid and hydrofluoric acid successively, that is, first add deionized pure water to the pickling pot lined with acid-resistant glue, and at the same time add hydrochloric acid with a mass content of 3%, start stirring, and load the mixed powder Washing, precipitation for 2 hours after washing, and then removing the waste liquid, then adding hydrofluoric acid wit...

Embodiment 2

[0029] Weigh 19.93g of lanthanum nitrate, 26.13g of zirconium nitrate, 25.44g of yttrium nitrate, 14.28g of lutetium nitrate, and 64.82g of ammonium rhenate powder to form a mixed solution, add 1778.0g of tungsten trioxide powder, fully stir and evaporate to dryness and dry , first reducing by passing hydrogen for 60 minutes in an environment with a temperature of 500°C, and then reducing by passing hydrogen for 60 minutes in an environment with a temperature of 800°C to obtain a mixed powder that meets the requirements and has good processability.

[0030] Wash the above-mentioned reduced mixed powder with hydrochloric acid and hydrofluoric acid successively, that is, first add deionized pure water to the pickling pot lined with acid-resistant glue, and at the same time add hydrochloric acid with a mass content of 4%, start stirring, and load the mixed powder After washing, precipitate for 2 hours, then remove the waste liquid, then add hydrofluoric acid with a mass content of...

Embodiment 3

[0032] Weigh 19.93g of lanthanum nitrate, 26.13g of zirconium nitrate, 25.44g of yttrium nitrate, 14.28g of lutetium nitrate, and 64.82g of ammonium rhenate powder to form a mixed solution, add 1778.0g of tungsten trioxide powder, fully stir and evaporate to dryness and dry , first reducing with hydrogen for 75 minutes in an environment with a temperature of 700°C, and then reducing with hydrogen for 75 minutes in an environment with a temperature of 1000°C to obtain a mixed powder that meets the requirements and has good processability.

[0033] Wash the above-mentioned reduced mixed powder with hydrochloric acid and hydrofluoric acid successively, that is, first add deionized pure water to the pickling pot lined with acid-resistant glue, and at the same time add hydrochloric acid with a mass content of 5%, start stirring, and load the mixed powder Washing, precipitation for 3 hours after washing, and then removing the waste liquid, then adding hydrofluoric acid with a mass co...

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Abstract

The invention discloses a non-radiative multi-component composite tungsten negative material for a microwave oven magnetron and a preparation process of the negative material. The tungsten cathode material comprises lanthanum oxide, zirconium oxide, yttrium oxide, lutetium oxide, rhenium and tungsten, wherein the mass percent of each rare-earth oxide in the tungsten electrode material is 0.5%-1.5%, the mass percent of the total rare-earth oxides in the tungsten electrode is 2%-3%, the mass percent of the alloy element rhenium in the tungsten electrode material is 1%-4%, and the tungsten accounts for the rest mass percent. The tungsten cathode material is non-radiative, excellent in thermal emission performance, excellent in high-temperature creep resistance, thermal shock resistance and sag resistance, and long in service life. The preparation method of the non-radiative multi-component composite tungsten cathode material for the microwave oven magnetron comprises the steps of solution preparation, drying, reducing, isostatic cool pressing, sintering, incipient fusion, medium-frequency induction annealing, press working, winding and mechanical straightening. The non-radiative multi-component composite tungsten negative material for the microwave oven magnetron is better in usability. When heated periodically for a long time at a high temperature, the multi-component composite tungsten wire produced by virtue of the process is capable of going through large deformational resistance, and has the sag resistance.

Description

technical field [0001] The invention relates to a tungsten cathode material for a microwave oven magnetron and a preparation process thereof, in particular to a radiation-free multi-component composite tungsten cathode material for a microwave oven magnetron and a preparation process thereof. Background technique [0002] The cathode of the microwave oven magnetron is the emitter of electrons, and it is also an integral part of the interaction space. The performance of the cathode has a great influence on the working characteristics and life of the magnetron, and is regarded as the heart of the magnetron. In order to improve the electron emission function of the cathode, thorium oxide is added to the pure tungsten material, but the cathode product made of this composite material has a high brittle-plastic transition temperature, difficult processing and forming, and a low recrystallization temperature, resulting in The magnetron cathode breaks uncontrollably during producti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C27/04B22F3/00H01J23/04
Inventor 顾进跃徐玄顾伟华袁克艳
Owner 深圳市威勒科技股份有限公司
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