WRe3 Tungsten-Rhenium Alloy Wire For Electron Tube Cathode Wire

1. Description of WRe3 Tungsten Rhenium Alloy Wire For Electron Tube Cathode Wire:

Once the tungsten wire is recrystallized after being used at a high temperature, it becomes very brittle and is easily broken under impact or vibration. To prevent the filament from breaking, doped tungsten wire, also known as tungsten-rhenium wire, is routinely used to electric light source items that demand high dependability.The alloy contains 1% to 5% (mass) of rhenium. Silicon, aluminum and potassium are added to improve the high temperature properties of the material. It can make the tungsten brittle transition temperature drop to room temperature or below.

2. Classification of WRe3 Tungsten Rhenium Alloy Wire For Electron Tube Cathode Wire:

3. Production Process of WRe3 Tungsten Rhenium Alloy Wire For Electron Tube Cathode Wire:

Tungsten Rhenium alloy wire production craft see below:

Raw material preparation - raw material separation - mixing - reduction treatment - second mixing - pressing and sintering - rotary forging, drawing processing - finished product.

1): Raw material preparation

The basic materials are powdered tungsten and ammonium rhenate, with tungsten powder having a particle size less than 4 um and ammonium rhenate having a particle size less than 200 um.

2): Raw material separation

Separate the tungsten powder and the ammonium rhenate powder in the separator to fully disperse the agglomerated particles.

3): Mixing

Put the tungsten powder and ammonium rhenate powder separated by the separator into a high-efficiency mixer for mixing, and the mixing time is 10-24 hours.

4): Restore processing

The uniformly mixed alloy powder is subjected to reduction treatment under the protection of hydrogen. The restore process is divided into three stages:

The first stage: reduction temperature 200-350 ° time 1-2h
The second stage: reduction temperature 400-600 ° time 1-2h
Third stage: reduction for 1-2 hours at a temperature of 700-900 °.
The processing time of each stage is determined according to the conditions of the processing equipment, the volume of the furnace, and the amount of charging.

5): The second mixing

The reduced alloy powder is loaded into the high-efficiency mixer again for mixing, and the mixing time is 8-20h.

6): Press sintering

The alloy powder after the second mixing is pressed into billets, and the billets are pre-sintered at a temperature of 1100-1300° under the protection of hydrogen for 0.4-1h, and the pre-sintered billets are at a temperature of 2600-3000° And the final vertical melting sintering under the protection of hydrogen, the time is 1-2h.

7): Rotary forging, drawing processing

The sintered billet is swaged on a swaging machine into thin rods, and the thin rods are drawn into tungsten-rhenium alloy wires on a wire drawing machine.

8): Finished product

4. Applictaion of WRe3 Tungsten Rhenium Alloy Wire For Electron Tube Cathode Wire:

For color picture tube heating filaments, various electron tube filaments and grids.

1). Production of tungsten filament lamps and chromatographic heat sensitive components with special requirements;
2) It is employed in the production of heating wire mesh for picture tubes, camera tubes, and TV heating;
3). For military electronic equipment.

5. Tungsten-rhenium alloy wire is an alloy composed of tungsten and rhenium. One is low-rhenium alloys, containing less than 5% rhenium; the other is high-rhenium alloys, containing 20% to 30% rhenium. Similar to how tungsten material is prepared, so is this substance. The main application is the filament of special electron tubes and color picture tubes, and high-temperature components that require high strength and high plasticity. The pairing of low-rhenium alloy and high-rhenium alloy can be used to measure thermoelectricity at high temperatures of 1500-3000 °C. I. Using tungsten-rhenium thermocouples instead of platinum-rhodium thermocouples to measure temperature can save precious metals such as platinum and rhodium. Another rare metal that is more expensive and has fewer resources is rhenium. If it is not necessary, tungsten alloys with no or less rhenium should be used as much as possible.

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