Refractory metals are extracted from ore concentrates processed into chemicals and then into powders.
Refractory sheet metal.
Refractory metals are characterized by their extremely high melting points which range well above those of iron cobalt and nickel.
The expression is mostly used in the context of materials science metallurgy and engineering.
They are used in demanding applications requiring high temperature strength and corrosion resistance.
Typ ical high temperature heating ele ments made of refractory metals are shown in figures 1 3.
Because of their high melting points and ease of oxidation refractory metals are usually worked in powder form.
Refractory metals are a class of metals that are extraordinarily resistant to heat and wear.
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The unique properties of refractory metals are key to numerous industrial applications and equipment.
Other metals that are occasionally considered refractory are hafnium zirconium and iridium.
The primary refractory metals are niobium tungsten tantalum molybdenum and rhenium in pure metallicor alloyedforms.
Ally consist of a refractory metal ele ment single two or three phase con structed of sheet plate rods stranded wire or woven wire mesh surrounded by radiation screens.
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The most extensively used of these metals are tungsten tantalum molybdenum and columbium niobium.
Rings of tung sten or molybdenum can be used as susceptors in induction furnaces.
Instead the photo resist is used as a mask for electrolytic coloring of the metals.
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The definition of which elements belong to this group differs.
When the photo resist is applied to the refractory metals titanium or columbium it is not intended to be an acid resist for etching.
The photographic image is developed through coloring of the metals rather than acid etching the image.