Electrode material of alloy element added with tungsten oxide and its preparation technique

Abstract

First, carbon 0.1-1% and strong oxides (1-5%) are added in the tungsten powder. Then, with one or two powders of oxides 0.5%-4% of low work function being added to the tungsten powder and mixed evenly, the admixture through chill pressing becomes the square billet is strip shape. Presintering procedure carries out at temperature 1300-1500 deg.K under hydrogen circumstance and final presintering procedures carries out at temperature 2800-3500 deg.K. The needed size of electrode is reached through the procedures of rotary swaging, rolling, wire drawing and polishing. A small quantity of alloy elements are added to the tungsten powder in order to balance the decomposition process of the oxides added in the arcing process and control the decomposition speed.

Description

1. Technical field [0001] The invention belongs to the field of novel electrical materials, and further relates to a tungsten-oxide electrode material added with alloy elements and a preparation process thereof. 2. Background technology [0002] With the development of science and technology, the preparation and processing methods of materials have made great progress. Plasma processing is a material processing method developed in recent years. Using the high temperature of plasma, metal can be melted rapidly to achieve the purposes of metallurgy, welding, cutting and surface spraying of metal materials. Arc plasma technology is widely used in industrial fields such as plasma welding, cutting, spraying, smelting and other materials preparation and processing, as well as other fields such as emitting electric light sources, microwave power tubes, vacuum tubes, and plasma thrusters. The tungsten electrode is the most critical part of these devices, which plays the role of car...

AI Technical Summary

Problems solved by technology

Although my country has very rich tungsten resources and long-term research and development of tungsten oxide electrode materials, the performance of the currently produced tungsten electrodes is difficult to meet the requirements of foreign imported equipment for the use of electrodes.

The main reason is that at present, the method of adding thorium salt to tungsten oxide is used in the manufacture of tungsten electrodes in my country. The size of the oxide is large and the distribution is uneven. Moreover, this method consumes a lot of energy and causes serious pollution.

It leads to the low service life of the electrode products produced and the arc instability during use, which affects the precision and quality of plasma processing