WRe3/25 WRe5/26 Tungsten Rhenium Thermocouple Wire C and D Type

WR31 (W-3Re)

It has a special non-sag property and many applications: heaters for various electronic tubes or small lamps. It also is the ideal material for probe pin because of its hardness.

WR3 and WR25(W-3Re and W-25Re)

They are used as  thermal couple wire, WR3 as positive lead wire; WR25as negative lead wire;

WR5 and WR26 (W-5Re and W-26Re)

They are used as  thermal couple wire, WR5 as positive lead wire; WR26 as negative lead wire;

WR5 and WR20 (W-5Re and W-20Re)

They are used as  thermal couple wire, WR5 as positive lead wire; WR20 as negative lead wire;

WR20, WR25 and WR26 (W-20Re, W-25Re and W-26Re)

They are all used as tie in the process of sapphire substrate producing. 
 

Brief Description:

 Because of the outstanding performance of Rhenium mentioned in the following table, when adding rhenium into tungsten,W-Re alloy are formed. Their electrical property, high-temperature ductility and processing ability are promoted and strengthened to a large extent which are available to the wide application on high temperature parts like heaters,thermocouples and cathode tubes etc.UMM produce customized W-Re alloys products with various specifications in the shapes of wire, rod, pole, plate and other irregular parts.

Tungsten-rhenium wire models are mainly: WRe3, WRe5, WRe20, WRe25, WRe26. 

Application: Tungsten can be added 3%, 5%, 25% and 26% of rhenium to form tungsten rhenium alloy for high temperature thermocouple wire and the cathode wire.  It has good high-temperature ductility, used in the electronics industry, nuclear industry and aerospace industries.

For details, see the table below:

 Preparation of raw materials - the raw material separation - mixing - reduction treatment - second mixing - pressure sintering - swaging, drawing - Finished

Production Process

 1: raw material preparation
 Raw materials for the tungsten powder and ammonium rhenium powder, tungsten powder particle size less than 4um, ammonium rhenium size of less than 200um

2: material separation
Tungsten powder and ammonium rhenium powder were separated in the separator, so that agglomerated particles well dispersed

3: Mixing
The separation had separated tungsten powder and ammonium rhenium powder together were loaded efficient mixer mixing, mixing time 10-24 hours

4: reduction treatment
Mixed alloy powder under the protection of hydrogen reduction treatment. Reduction treatment in three stages:
The first stage: the reduction temperature is 200-350 ° time 1-2h
The second stage: the reduction temperature is 400-600 ° time 1-2h
The third stage: the reduction temperature is 700-900 ° time 1-2h
Processing time for each stage of the processing apparatus according to the conditions, the chamber volume, added material may be
5: second mixing
Mixing, mixing time 8-20h alloy powder after reduction by re-loading efficiency blender

6: Pressure sintering
The second alloy powder after mixing is compressed into billet, billet now pre-sintering time 0.4-1h, pre-sintered at a temperature of 2600-3000 ° billet at a temperature of 1100-1300 ° and hydrogen protection and hydrogen under the protection of the final incipient fusion sintering time 1-2h

7: swaging, drawing
Sintered billet in the swaging swaging machine processed into thin rods, thin rod drawing machine drawn into tungsten-rhenium alloy wire

 8: Finished
Packing: Each volume 400-600g, per kilogram of 250m-260m.