Thoriated tungsten rhenium wire and preparation method thereof

Abstract

The invention relates to the technical field of preparation of a metal material, and particularly relates to a thoriated tungsten rhenium wire, which is especially suitable for winding a microwave oven magnetron, and a preparation method thereof. The thoriated tungsten rhenium wire is characterized by comprising the following components of 0.5-1.5% of thorium oxide, 0.3-0.5% of rhenium, 0.0020-0.0080% of potassium, and 97-98% of tungsten. Compared with the prior art, the thoriated tungsten rhenium wire has the following advantages that (1) according to the thoriated tungsten rhenium wire prepared by the method disclosed by the invention, thorium oxide particles are in fine and even distribution even if 0.0020-0.0080% of potassium is doped; and (2) the thoriated tungsten rhenium wire disclosed by the invention contains a microelement potassium in ingredient; a little of rhenium is added; the grain does not easily grow after the magnetron coil for the micro-wave oven wound by the thoriated tungsten rhenium wire is carbonized at a high temperature; stable tissue can be kept; and brittle failure caused by vibration in the transportation processes such as package, shipment and the like after production is finished can be ensured.

Description

technical field [0001] The invention relates to the technical field of metal material manufacturing, in particular to a thoriated tungsten-rhenium wire which is especially suitable for winding a microwave oven magnetron and a manufacturing method thereof. Background technique [0002] In the prior art, the magnetron used in the microwave oven is wound with thoriated tungsten wire. In order to improve the stability of magnetron emission, it is required to carbonize the magnetron wound with thoriated tungsten wire. Carbonization is to place the shaped and assembled magnetron in hydrocarbon vapor and heat it to 2200-2500°C. When hydrocarbon vapor contacts high-temperature tungsten, carbon and hydrogen are decomposed, and carbon is attached to thorium. The surface of the tungsten wire forms tungsten carbide with tungsten and diffuses into the tungsten. Since the binding force between thorium atoms and tungsten carbide is stronger than that of tungsten, tungsten carbide will r...

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Problems solved by technology

[0003] However, during the carbonization process of microwave oven magnetrons made of traditional thoriated tungsten wires, since the carbonization temperature is higher than the recrystallization temperature of thoriated tungsten wires (about 2000°C), the tungsten grains grow rapidly, resulting in The brittleness of the microwave oven increases, so that it is prone to brittle fracture during the assembly and transportation of the microwave oven magnetron, reducing the yield of the microwave oven magnetron in the production process

In addition, due to the low creep resistance of traditional thoriated tungsten wires, microwave oven magnetrons made of traditional thoriated tungsten wires will be deformed during use, shortening their service life

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