Lanthanated Tungsten is oxidized lanthanum doped tungsten alloy and belongs to oxidized rare earth tungsten (W-REO). By adding oxide lanthanum, the doped tungsten shows enhanced heat resistance, conductivity, creep resistance and higher recrystallization temperature in comparison to pure tungsten.
Lanthanated tungsten products are made from tungsten and oxidized lanthanum powder through the powder metallurgy process, which meets our stringent powder purity and size requirements. After following the ordered steps of heat treatment, reduction, pressing and sintering, the tungsten and oxide lanthanum composition will be mainly forged or swaged to different standards of rods and wires.
Lanthanated Tungsten Electrode
Tungsten lanthanum has proven to be a very promising material to utilize in further as electrodes. The valuable properties of oxide lanthanum allow Lanthanated tungsten electrode has a well-balanced oxide evaporation and migration rate at a low electron work function. Therefore, Lanthanated tungsten electrode to exhibit excellent arc starting, stability and re-ignition, electrode life, as well as a low risk of weld contamination, especially when direct current (DC) welding is applied. Most importantly, lanthanated tungsten electrode has no radioactive hazard and works well in both DC and AC welding. Because of this, lanthanated tungsten electrode is considered as the prospective replacement of Thoriated tungsten electrode.
In addition, Lanthanated tungsten electrode has better current carrying capacity and lower consumption (when operating the alternating current arc welding.) The lanthanated tungsten electrode (1.5% to 2% by weight of the La2O3) has become the optimum option for most applications in comparison to Thoriated tungsten and Ceriated tungsten.
Other Rare Earth Oxide Tungsten We Produce
CHEMETAL USA has the capacity to manufacture W-La2O3, W-CeO2, W-Y2O3 and other oxide rare earth tungsten rods. They are mainly used as electrodes and cathodes in many applications. We are also dedicated to researching and developing qualified oxide rare earth tungsten flat materials.
Rare earth oxide doped tungsten electrodes, such as W-La2O3 and W-CeO2, possess many superior welding characteristics. Rare earth oxide doped tungsten electrodes represent the best properties among electrodes for Gas Tungsten Arc Welding (GTAW), which is also known as Tungsten Inert Gas (TIG) welding and Plasma Arc Welding (PAW). The oxides added to tungsten increased the recrystallization temperature and, at the same time, promoted the emission level by lowering the electron work function of the tungsten electrode.
Oxide Rare Earth Properties And Composition In Tungsten Alloy
|Type of oxides||ThO2||La2O3||CeO2||Y2O3|
|Melting point oC||3050|
|Heat of decomposition. Kj||1227.6||1244.7||(523.4)||1271.1|
|Type of oxides after sintering||ThO2||La2O3||CeO2|
|Reaction with tungsten||Reduction of ThO2|
by W occurs.
forming pure Th.
|Forming tungstate||Forming tungstate|
|Stability of oxides||Lower stability||Higher stability||Reasonable stability at |
the electrode edge
but lower stability
at the tip
|Oxide weight %||0.5 - 3||1 - 3||1 - 3||1 - 3|