Use of platinum in glass industries today is very vital as platinum is only metal which is un
wetted to glass, so to improve the life of the assemblies which are in direct contact with
molten glass platinum is essentially used.
In this paper we will discuss about an alloy of platinum (called hardened platinum) which is
specially developed to be used in molten glass temperature measurement with thermocouples.
Thimbles made of special platinum alloy containing 10% Rhodium with
small% of Zirconium oxide or yttrium oxide (as grain stabilizer), are
developed specially for the application in glass industries.
Theses materials offer significantly improved performance over
conventional platinum and its alloys.
It is a new class of materials and has optimized it for special
applications:
High strength with good ductility in the high temperature range (up to 1700°C).
Excellent weld ability while the strength is maintained.
Exceptional corrosion resistance and a more stable microstructure over longer service
times.
Less re-crystallization.
These characteristics allow for longer service lives for
the individual components and permit the precious
metals to be used more economically, for instance
through reduced wall thicknesses. The higher
strength of the material also has a stabilizing effect
on the equipment manufactured from it. Strengthening components of e. g. molybdenum,
ceramics or refractory metals thus become effectively redundant. The inclusion of finely
distributed zirconia as a dispersion impedes grain growth to a temperature just below the
melting point. Due to the modified, finer microstructure, it is considerably less sensitive to
corrosion processes along the grain boundaries than comparable materials. This ensures better
corrosion resistance
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