That is why welding with tungsten is only possible in a protective gas atmosphere or reducing atmosphere
, otherwise the material breaks down.
Some [Eu.sup.3+] doped samples were annealed in a [H.sup.2]/Ar reducing atmosphere
in order to convert [Eu.sup.3+] into [Eu.sup.2+].
If hydrazine hydrate is used at the same experiment conditions, the "intermediate" is maintained due to the strong reducing atmosphere
, resulting in the final products of cubic [Fe.sub.3][O.sub.4] (Figure 3(a)); however, sizes of the products are still nanoscale (Figure 3(b)).
After cone 06 the burners produced a slightly reducing atmosphere
until the end of the firing.
Luster is produced by direct application of very thin layer of metallic paint on the surface of glazed ceramic which after firing at temperatures between 500 to 600oC in a reducing atmosphere
results in the formation of a metallic like layer (Perez et al.
Insoluble ferrocyanide also releases toxic cyanogen gas in a reducing atmosphere
. Therefore, an innovative method of heat solidification has been sought to solve the problem.
Covered melting with an inert or reducing atmosphere
would reduce burning carbon monoxide and ambient oxygen, which reacts with molten metal, in the furnace.
Forming gas (95% [N.sub.2], 5% [H.sub.2]) offers an additional margin of safety by providing a reducing atmosphere
that eliminates any possible oxidation from air currents and turbulence.
Extrapolating this result with a carbon-rich plastic projectile to an iron-rich meteorite, the researchers concluded that the latter would react with carbon dioxide on the young Earth, temporarily creating a reducing atmosphere
around the impact site.
The vias then were filled with tungsten and sintered in an [H.sub.2]/[N.sub.2] reducing atmosphere
. This step resulted in a via fill with approximately 20 percent porosity.
* it contributes to a reducing atmosphere
in the mold during the metalcasting process, thus creating an oxygen scavenger.