The temperature range used for tungsten wire during annealing is mainly determined by the type of tungsten wire and the required performance. The following are some common tungsten wire annealing temperature ranges:
Ordinary tungsten wire:
The annealing temperature is generally 1800℃. At this temperature, the tungsten wire can undergo grain growth and performance improvement, while avoiding excessive grain growth or melting of the tungsten wire due to excessive temperature.
Pure tungsten wire:
Pure tungsten wire refers to tungsten wire with a tungsten content of more than 99.95%. Due to its high purity, the annealing temperature of pure tungsten wire is relatively high, generally 2200℃. At this temperature, pure tungsten wire can undergo more sufficient grain growth, thereby obtaining better performance.
Single crystal tungsten wire:
Single crystal tungsten wire is a tungsten wire without grain boundaries, and its annealing temperature is higher, generally 2400℃. At this temperature, single crystal tungsten wire can maintain its grain boundary-free structure while obtaining higher strength and toughness.
In addition, there are some special cases where the annealing temperature of tungsten wire may be different. For example, when preparing La-based amorphous composite materials, when the volume fraction of tungsten wire is 60%, the optimal annealing temperature of the composite material is 1000℃, at which time the compressive strength and compressive plasticity of the composite material reach the best value. However, this annealing temperature is not applicable to all types of tungsten wires, but is for specific composite materials.
In addition, according to some experimental data, the temperature of 0.5mm diameter tungsten wire during straightening heat treatment is about 800~1000℃. This indicates that the annealing temperature may also be different for tungsten wires of different diameters or uses.
The temperature range used for tungsten wire during annealing is mainly determined by the type of tungsten wire and the required performance. The following are some common tungsten wire annealing temperature ranges:
Ordinary tungsten wire:
The annealing temperature is generally 1800℃. At this temperature, the tungsten wire can undergo grain growth and performance improvement, while avoiding excessive grain growth or melting of the tungsten wire due to excessive temperature.
Pure tungsten wire:
Pure tungsten wire refers to tungsten wire with a tungsten content of more than 99.95%. Due to its high purity, the annealing temperature of pure tungsten wire is relatively high, generally 2200℃. At this temperature, pure tungsten wire can undergo more sufficient grain growth, thereby obtaining better performance.
Single crystal tungsten wire:
Single crystal tungsten wire is a tungsten wire without grain boundaries, and its annealing temperature is higher, generally 2400℃. At this temperature, single crystal tungsten wire can maintain its grain boundary-free structure while obtaining higher strength and toughness.
In addition, there are some special cases where the annealing temperature of tungsten wire may be different. For example, when preparing La-based amorphous composite materials, when the volume fraction of tungsten wire is 60%, the optimal annealing temperature of the composite material is 1000℃, at which time the compressive strength and compressive plasticity of the composite material reach the best value. However, this annealing temperature is not applicable to all types of tungsten wires, but is for specific composite materials.
In addition, according to some experimental data, the temperature of 0.5mm diameter tungsten wire during straightening heat treatment is about 800~1000℃. This indicates that the annealing temperature may also be different for tungsten wires of different diameters or uses.
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