Rhenium-tungsten-yttrium cathode for microwave oven magnetron and preparation technique thereof

Abstract

The invention discloses a preparation process of a rhenium-tungsten-yttrium cathode for a microwave oven magnetron, which is characterized by comprising the following processes: mixing materials: adding rhenium yttrium liquid and ammonium paratungstate according to a ratio of 0.3-3% of yttrium, 0.1-2% of rhenium and the balance of tungsten in percentage by weight, mixing the rhenium yttrium tungsten liquid; carrying out first hydrogen reduction and second hydrogen reduction, compacting, secondary melting, cooling after forging, drawing, electrolyzing, cutting off or the like. The brittleness and high temperature properties of the product enhance the plasticity of the product; and the product has the advantages of favorable working performance, high plasticity, low production cost and no radiation, and can greatly lower the working temperature on the premise of achieving the same working efficacy, thereby greatly lowering the high-temperature-resistant requirements for the electrode metal material, satisfying the requirements for environmental protection and obviously lowering the manufacturing cost.

Description

technical field [0001] The invention relates to the technical field of microwave oven magnetrons, in particular to a cathode of a microwave oven magnetron. 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 is added to the pure tungsten material, but the cathode products made of this alloy system have congenital defects of room temperature brittleness and high temperature brittleness, which have not been solved so far. This will lead to uncontrollable fracture of the magnetron cathode during production, transportation and use, resulting in failure of the magnetron. Seriously affect the reliability of the product and increase the manufac...

AI Technical Summary

Problems solved by technology

Lead to uncontrollable fracture of the magnetron cathode 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. The half-life of thorium is 1.39×1010 years, and it is difficult to recycle. Its waste products pose a pollution threat to the environment. At the same time, China currently undertakes 100% of the world’s magnetron production for microwave ovens. As an extremely important rare earth strategic resource, thorium can be used for Clean energy nuclear power manufacturing. Therefore, from the perspective of rational use of resources, it has become an important research topic in this field to provide a tungsten cathode that can replace the existing thoriated magnetron in microwave ovens.