Views: 12 Author: Site Editor Publish Time: 2020-08-14 Origin: Site
Compared with traditional electrode materials, tungsten-based electrode materials have the characteristics of high melting point, good corrosion resistance, high density, and superior thermal and electrical conductivity, so they are widely used in the field of welding. How to prepare tungsten-based electrode materials?
Tungsten-based electrode material is made of tungsten oxide, soluble nickel salt and soluble strontium salt. Based on 100 parts by weight, the parts by weight of tungsten, nickel and strontium are as follows: tungsten: 88-98.5 parts by weight, nickel: 0.5-6 parts by weight, strontium: 1-6 parts by weight, so that the density of the prepared product is 12～18g/cm3.
The above-mentioned tungsten-based electrode material is prepared by solid-liquid doping. The specific steps are as follows:
1. According to the ratio of tungsten, nickel and strontium, the corresponding amount of tungsten oxide is mixed into the mixed aqueous solution formed by the corresponding amount of soluble nickel salt and soluble strontium salt, and the precursor powder is obtained by stirring, mixing and drying;
2. Calcining step: calcining the precursor powder to obtain calcined powder;
3. Reduction step: reducing the calcined powder to obtain doped tungsten powder;
4. Forming step: pressing the doped tungsten powder to form a blank;
5. Sintering step: sintering the blank to prepare the tungsten-based electrode material.
However, due to the high temperature of the working environment, pure tungsten-based electrode materials are difficult to handle. Therefore, manufacturers often add some rare earth oxides to metal tungsten to stimulate its electronic work function. Common rare earth additives include cerium oxide, lanthanum oxide, zirconium oxide, yttrium oxide, and thorium oxide.
Tungsten electrode materials containing rare earth oxides have better arc starting performance, higher arc column stability, and lower electrode burnout rate.