Method for producing thorium-tungsten wire

Abstract

The method includes following steps: adding certain quantity of solution of thorium nitrate into tungsten oxide so as to prepare doped powder of tungsten oxide; deoxidizing the obtained doped powder of tungsten oxide to obtain powder of thorium - tungsten; acid cleaning powder of thorium - tungsten to remove impurity, and producing sintered body of powder of thorium - tungsten; using press work to obtain thorium -tungsten filament with needed diameter, and content of thorium dioxide being 0.7-1.1 wt%, and enwinding thorium -tungsten filament by using wire coil; Finally, straightening filament. The invention raises the rate of finished products, and optimizes working performance of tungsten winding.

Description

technical field

[0001] The invention relates to a manufacturing method of a thoriated tungsten wire for a cathode tungsten coil of a magnetron, in particular to a manufacturing method of a thoriated tungsten wire capable of improving the yield, saving costs, and optimizing the working performance of the tungsten coil. Background technique

[0002] As we all know, the tungsten coil used in the cathode part of the magnetron is made of thoriated tungsten wire wound into a helical shape. It has the ability to emit electrons after being heated to a specified temperature by a current. This cathode has a short heating time and resistance Strong electron bombardment ability and so on. When the thoriated tungsten cathode in the magnetron is working, the thorium atoms generated in the cathode continuously diffuse to the surface of the tungsten wire to form a thorium atomic layer, which reduces the work function of the cathode surface and increases the radiation capacity. The layer of...