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