Lanthanum Tungsten Electrodes Performance And Manufacturing Methods

In order to take power system with excellent performance and no radioactive contamination of tungsten electrode, tungsten trioxide powder of lanthanum oxide was added , after reduction, vertical melt , swaging , drawing obtained Φ2.7mm lanthanum tungsten electrode with the same specifications cerium tungsten, tungsten thorium power level for the electrical performance comparison , while a scanning electron microscope , measuring the electrical performance test tungsten lanthanum , cerium tungsten electrodes lanthanum , cerium content and microstructure of the distribution . The results showed that: Lanthanum tungsten electrode tungsten electrical performance than cerium , thorium tungsten ; lanthanum oxide, lanthanum tungsten migration rate , evaporation rate is low , to form a better lap dovetail organization with high temperature creep performance.

Lanthanum tungsten electrode manufacturing method with the use of lanthanum nitrate lanthanum tungsten-coated powder preparation methods, in common with the reduction of time is prolonged, the lanthanum average particle size of the tungsten powder coated grow . The lanthanum nitrate reduction by more sensitive to the impact of time , the average increase in grain size range. The method of the present invention , lanthanum tungsten-coated powder particle size by reducing the influence of time fluctuation is small, in the particle size range within a certain time basically converge. These two different approaches are eventually encapsulated in the form of La2O3 tungsten , plays the role of grain refinement , but due to their respective decomposition temperature differences inevitably lead to the difference in outcome . The method of the present invention , the specific process conditions, the particle size range of less volatile , and in accordance with repression, burn process requirements , which can effectively reduce gasification process , helping to eliminate harmful gases nitrogen oxide pollution is a more ideal method for preparing lanthanum tungsten electrodes .


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