Method for producing tungalloy bar for use in electrode

Abstract

The invention belongs to a production method for tungsten alloy for electrode use, including: preparation of rare earth nitrate solution, preparation of rare earth doped with blue tungsten, reducing, preparingunburnt earthenware, sintering and vertically melting. The method takes blue tungsten with large specific surface, developed surface cracks as raw materials, dissolves high purity rare earth nitrate in deionized water as additives; in the production process, slurry evaporation drying methods adopts low temperature agitation evaporation, then higher temperature evaporation for drying to avoid segregation caused by rapid doping precipitation by the direct use of high-temperature drying; Blue-doped tungsten and tungsten powder has loose particles with particle size consistent with mormal, good formability and good sintering properties and physical properties for follow-up processing. The method has the advantages of advanced technology, reliablity, short process, uniform distribution of rare earth and stable quality, good machining properties and functional performance and can be used for large-scale industrialized production, and other characteristics. The method overcomes frauds of the technical background doping effect and the quality of stability, moldability, downstream processing and poor functional performance ills.

Description

technical field [0001] The invention belongs to a production method for producing tungsten alloy for electrodes, in particular to a production method for producing tungsten alloy strips for electrodes by doping blue tungsten and rare earth nitrate solution. Background technique [0002] Tungsten has a high melting point, strong electron emission capability, high elastic modulus, and low vapor pressure, and is widely used as a thermionic emission material. However, the emission efficiency of pure metal tungsten electrodes is very low, and recrystallization at high temperature forms an equiaxed grain structure, which makes the tungsten wire brittle and easy to break. In order to overcome the above defects, people often use metal tungsten as the base material, and dope some rare earth oxides with low power required for electron escape to increase the recrystallization temperature and activate the electron emission ability, thereby producing certain rare earth elements. Perform...

AI Technical Summary

Problems solved by technology

The traditional solid-liquid addition method, such as the patent document with the publication number CN1050511 and the name "Preparation Method of Cerium Tungsten Powder", discloses a method of mixing tungsten trioxide and cerium acetate solution, stirring, high-pressure evaporation, concentration, and drying. , and finally through primary and secondary reduction and sieving to obtain cerium tungsten powder containing 1 to 8% (weight) cerium oxide; this technology should use tungsten trioxide with larger particles and small specific surface area (or use ammonium paratungstate to sinter Post-obtained WO 3 ) as raw material, its permeability is poor when mixed with rare earth salt solution, rare earth salt can only be adsorbed on WO 3 The surface of the particles; the doping effect and quality stability, formability and subsequent processing and use performance are poor; when using smaller particle size WO 3 When it is used, it is easy to cause the pellets to stick and agglomerate, and there are defects such as reduction, powder uniformity, formability and usability.