A non-radiative multi-component composite tungsten cathode material for microwave oven magnetron and its preparation process

Abstract

The invention discloses a radiation-free multi-component composite tungsten cathode material for a microwave oven magnetron and a preparation process thereof. The mass percentage of the tungsten electrode material is 0.5%~1.5%, the total amount of rare earth oxides accounts for 2%~3% of the mass percentage of the tungsten electrode material, and the alloy element rhenium accounts for 1%~4% of the mass percentage of the tungsten electrode material, The rest is tungsten. The tungsten cathode material has no radiation, excellent thermal emission performance, high temperature creep resistance, thermal shock resistance, sagging resistance, and long service life. The preparation method of non-radiation multi-element composite rare earth tungsten alloy electrode material for microwave oven magnetron includes preparation solution, drying, reduction, acid washing, cold isostatic pressing, sintering, vertical melting, medium frequency induction annealing, pressure processing, winding and mechanical calibration straight. And the performance is better. The multi-component composite tungsten wire produced by this process can obtain large deformation resistance and anti-sagging performance when it is heated for a long period of time at high temperature.

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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