Rhenium tungsten wire

Tungsten-rhenium alloy wire ( 钨铼合金

线) Or sapphire tungsten-rhenium alloy wire ( 钨铼合金线蓝宝石) Is base in rhenium tungsten alloy elements, is a kind of tungsten alloy. Typical rhenium content in the alloy is: 1%, 3%, 5%, 20%, 25% and 26%, etc.

name

rhenium tungsten wire

foreign names

tungsten

rhenium alloy wire

the alias

sapphire tungsten-rhenium alloy wire

abstract

to add element of a rhenium tungsten based alloy composed of

the commonly used models

W - Re 25, diameter of 0. 5 mm

hardness

high

strength

high

plastic

high

tungsten often spawned a micro cracks on the surface of the grain boundary, the micro crack extension is the important cause of tungsten chopped off. Tungsten-rhenium alloy in easy forming twin deformation process, and thus reduce the stacking fault energy, reduce the dislocation movement of grain boundary impedance, resulting in dislocation mobility increases, prompting tungsten solution to soften. This phenomenon is called 'rhenium plasticizing effect'. In the tungsten-rhenium alloy series, rhenium concentration low rhenium plasticizing effect is obvious, rhenium concentration is high the plasticizing effect of rhenium.

category editing

according to use classification:

W - 3 / W - 25再保险,W - 5 / W - 20 re

W - 5 / W - 26再保险,W / W - 26 re, 2: used for single crystal sapphire binding with the rhenium tungsten wire or sapphire tungsten-rhenium alloy silk commonly used models: W - Re 25, diameter of 0. 5 mm

performance

tungsten-rhenium alloy has a series of excellent properties, such as high melting point, high strength, high hardness, high plasticity, high recrystallization temperature, high resistivity, low vapor pressure, low electronic work function and lower ductile brittle transition temperature, etc. Tungsten-rhenium alloy in addition to the above performance, low rhenium alloy with high rhenium matching into thermocouple wire, with a high thermoelectric potential values. Various types of the thermoelectric potential value of tungsten-rhenium thermocouples with the temperature of the relationship between single crystal sapphire binding with the rhenium tungsten wire commonly used models: W - Re 25, diameter of 0. 5毫米。

1. Rhenium tungsten wire of rhenium in uniform distribution, control the rhenium content range 30. 15﹪；

2. A single weighs 3 kg;

3. To diameter 0. 39 mm, rhenium tungsten wire yield of no less than 75;

4. Rhenium tungsten wire filament silk uniform size.

manufacturing process

for making tungsten rhenium alloy has two kinds of powder metallurgy method and melting method, commonly used in production of powder metallurgy method. In the production of tungsten rhenium alloy powder metallurgy process is:

for making tungsten rhenium alloying powder - hydrogen reduction - pressure form ( Moulded or isostatic pressing) - > sintering ( Sintered sintering or medium frequency induction sintering) - pressure processing ( Including extrusion, rolling, forging and drawing, etc. ) 。

for making tungsten rhenium pre alloy powder is a commonly used method of fixation ( Tungsten powder, tungsten trioxide powder mixed with rhenium powder mixed with rhenium acid ammonium powder) Liquid and solid a method ( Mixed with ammonium nitrate solution rhenium tungsten powder, tungsten trioxide powder mixed with rhenium acid ammonium solution) , a liquid ( Ammonium tungstate solution mixed with rhenium acid ammonium solution by spray drying or other methods for making) And so on.

by hydrogen reduction of tungsten rhenium alloy powders are available and the steel mould of mechanical press forming, isostatic pressing or forming ( Compact density uniform) 。 Compact available direct electricity sintered sintering or cP, N induction indirect heating sintering, get a relative density of 92% ~ 95% rhenium tungsten alloy bar. Isostatic pressing forming and intermediate frequency induction heating sintering available * classy article, the uniformity and consistency is * better methods of production of all. USES the

tungsten-rhenium alloy structure material is mainly used for high temperature field, and in the electronic technology, nuclear technology, space technology and temperature measuring technology has widespread use.

* widely used currently has three aspects:

1. Low rhenium alloy wire with high rhenium alloy silk into a thermocouple

2. Low rhenium alloy silk with high rhenium alloy wire matching thermocouple, temperature measuring range ( 0～2500C) , high thermoelectric potential value, fast response speed, good corrosion resistance, so the tungsten-rhenium thermocouples wire is widely used in the temperature measuring instrument. It is not only used for vacuum, reducing atmosphere and inert atmosphere, and adopt measures to prevent oxidation is also used in oxidizing atmosphere instead of platinum rhodium thermocouple temperature measurement by practical application.

3. Be used in the manufacture of single crystal sapphire, bundling.