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

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...

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.

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