Manufacturing method for nano rare earth tungsten electrode

Abstract

The invention discloses a manufacturing method for a nano rare earth tungsten electrode. The manufacturing method comprises the following steps: step 1, weighing components in percentage by mass of 0.1%-0.37% of lanthanum nitrate, 2.33%-5.6% of yttrium nitrate, 0.35%-1.05% of cerous nitrate and 92.25%-96.5% of ammonium paratungstate; step 2, conducting reduction at high temperature under the protection of hydrogen to obtain rare earth composite tungsten dioxide powder; step 3, adding the rare earth composite tungsten dioxide powder into a high-energy ball mill, and performing grinding so as to obtain nano rare earth tungsten alloy powder with the powder grain size of 30nm-40nm; step 4, pressing the nano rare earth tungsten alloy powder into a nano rare earth tungsten alloy billet bar in an isostatic pressing machine; step 5, sintering the nano rare earth tungsten alloy billet bar in a medium-frequency induction furnace until a nano rare earth tungsten alloy bar with the density of more than 18.3kg / m<3> is obtained; and step 6, performing high-temperature rotary swaging cogging and stretching on the nano rare earth tungsten alloy bar so as to obtain a nano rare earth tungsten electrode. According to the manufacturing method for the nano rare earth tungsten electrode disclosed by the invention, the zero-field emission electric current density of a tungsten electrode is increased, the fare damage rate is reduced, and the service life of the tungsten electrode is prolonged.

Description

technical field [0001] The invention relates to a tungsten electrode, in particular to a method for manufacturing a nanometer rare earth tungsten electrode. Background technique [0002] The existing tungsten electrodes are made of tungsten powder, and the particle size of tungsten powder is mostly micron. Due to the large particle size of tungsten powder, the powder specific surface area is small, the active components in the powder are distributed unevenly, and the surface active layer is thin. The migration and diffusion speed of the active material is poor at high temperature, resulting in low zero-field emission current density of the tungsten electrode, low high temperature resistance, poor heat reflection performance, and high burning rate of the tungsten electrode. Therefore, in order to avoid the shortcomings existing in the prior art, it is necessary to improve the prior art. Contents of the invention [0003] The purpose of the present invention is to overcome ...

AI Technical Summary

Problems solved by technology

[0002] The existing tungsten electrodes are made of tungsten powder, and the particle size of tungsten powder is mostly micron. Due to the large particle size of tungsten powder, the powder specific surface area is small, the active components in the powder are distributed unevenly, and the surface active layer is thin. The migration and diffusion speed of the active material is poor at high temperature, resulting in low zero-field emission current density of the tungsten electrode, low high temperature resistance, poor heat reflection performance, and high burning rate of the tungsten electrode