Improving the seismic resistance of tungsten wire can be achieved through the following methods:
- Doping modification
Selection of doping elements:
Adding appropriate amounts of elements such as K, Si and Al to tungsten powder can significantly improve the high temperature resistance and anti-sagging performance of tungsten wire, which is the basis for improving seismic resistance.
On this basis, adding trace amounts of Fe, Co, La, Ce, Th and other elements can further improve the seismic resistance of tungsten wire. Especially the Co element, which can inhibit the growth of tungsten grains, reduce the infiltration of oxygen, and enhance the interfacial bonding between the tungsten matrix and the dopant, thereby improving the high-temperature strength and seismic resistance of the tungsten wire after recrystallization.
Doping process optimization:
Select raw materials with low impurity content and good grain morphology for doping.
Control the content and proportion of doping elements to obtain the best seismic effect.
Optimize parameters such as temperature, time and atmosphere during the doping process to ensure that the doping elements can be evenly distributed in the tungsten wire.
- Raw material selection
Raw material types:
The raw materials used to make seismic tungsten wire are mainly ammonium paratungstate (APT), ammonium metatungstate (AMT) and blue tungsten (TBO).
Among them, blue tungsten has the advantages of high chemical properties, good doping effect, large specific surface area and fast rate. Doping with blue tungsten can further improve the anti-sagging performance of tungsten wire.
Raw material purity: Improving the purity of raw materials can reduce the adverse effects of impurities on the performance of tungsten wire, thereby improving the seismic resistance of tungsten wire.
- Manufacturing process optimization
Powder metallurgy stage:
In the powder metallurgy stage, by optimizing the process parameters such as reduction, pressing and sintering, tungsten wire with good microstructure and performance can be obtained.
For example, tungsten wire with excellent high temperature performance can be obtained by using two-stage slow heating sintering.
Plastic processing stage:
In the plastic processing process, such as rotary forging and stretching, the microstructure and performance of tungsten wire can be further optimized by controlling parameters such as deformation speed, temperature and pressure.
In particular, cobalt-doped tungsten wire needs to be heated slowly at medium temperature during plastic processing to obtain good processability and seismic resistance.
- Post-processing process
Recrystallization annealing:
Recrystallization annealing of tungsten wire can eliminate work hardening and internal defects, thereby improving its seismic resistance.
The annealing temperature and time need to be determined according to the specific composition and performance requirements of the tungsten wire.
Surface treatment:
Oxidation, spraying or plating of the surface of tungsten wire can form a protective film to prevent oxidation and corrosion of tungsten wire at high temperature, thereby improving its shock resistance and service life.
More details of tungsten wires, please visit website: http://tungsten.com.cn/tungsten-wires.html
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