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Tungsten-Rhenium Alloy Wire Manufacturing Processes and Uses

Preparation of tungsten rhenium alloy powder metallurgy method and the melting two types of powder metallurgy used in the actual production method. Production of tungsten rhenium alloy powder metallurgy process are:
Preparation of pre-alloyed powders of tungsten rhenium hydrogen reduction → → Pressure-shaped (molded or isostatic) → sintering (vertical frequency induction melting or sintering sintering) → pressure processing (including extrusion, rolling, swaging and drawing, etc.).

Preparation of tungsten rhenium alloy powder used pre-solid-solid method (powder mixture of tungsten powder and rhenium, rhenium trioxide, ammonium tungsten powder and powder mixture), a solid-liquid method (Tungsten powder was mixed with ammonium rhenium, tungsten trioxide powder mixed with ammonium perrhenate solution), liquid-liquid method (ammonium tungstate solution was mixed with ammonium perrhenate by spray drying or other method of preparation) and so on.
By hydrogen reduction of tungsten-rhenium alloy powder may be mechanically pressed and steel molding, or isostatic pressing (compacts uniform density). Article compacts can direct electrical sintering or melting down cP, N induction indirect heat sintering, to obtain a relative density of 92% to 95% tungsten rhenium alloy bar. Isostatic pressing and sintering induction heating billet highest quality available, and its uniformity and consistency are the best of all production methods.

Tungsten-rhenium alloy is mainly used for high temperature structural materials field, and in the electronic technology, nuclear technology, space technology and other aspects of temperature measurement technology has wide applications.
Currently the most widely used has three aspects: Low rhenium alloy wire with high rhenium alloy thermocouple wire into the match

Low-rhenium alloy wire with high rhenium alloy thermocouple wire into the match, wide temperature range (0 ~ 2500C), thermoelectric power value is high, fast response, good corrosion resistance, so tungsten rhenium thermocouple wires to get in the thermometer widely used. It is not only used for a vacuum, reducing atmosphere and inert atmosphere, and the measures taken to prevent oxidation in an oxidizing atmosphere Also used instead of platinum-rhodium thermocouple practical application.
For the manufacture of single crystal sapphire, making bundled with.


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