Titanium Tungsten Composite Plasma Material
The ITER device is a superconducting tokamak can produce large-scale nuclear fusion reactions, aims to create a clean and sustainable energy future of mankind.
ITER uses deuterium and tritium to produce nuclear fusion. Deuterium and tritium fusion in the circulation with millions, tens of millions of billions of temperature, the circulator must be strengthened by high temperature resistant metal, from the engineering point of view, material problems determine the success or failure of fusion energy development.
In fusion materials, a very important type of material is plasma facing material (PFMs), and the general requirement for PFMs is: high temperature resistance, low sputtering, low hydrogen (tritium) retention and compatibility with structural materials. Tungsten is considered to be the most promising PFMs material, which can meet many requirements in this harsh environment. However, tungsten is facing severe brittleness because of its own structural characteristics. Therefore, it is possible to solve the brittleness problem of tungsten by adding tungsten doped titanium element into tungsten matrix composite.
At present, there are many ways to solve the problem of doped tungsten. This paper introduces a new method of doping tungsten powder titration method. In the suspension of ammonium metatungstate (AMT) saturated solution with titanium carbide (TiC) powder and dispersant, ethanol was added dropwise to obtain AMT coated titanium carbide precursor; Tungsten coated TiC composite powders were prepared by high purity hydrogen reduction of precursor, and titanium tungsten composite was prepared by spark plasma sintering (SPS) technique.
The results show that the titanium - tungsten composite material is reduced by 1 °C at 600 °C for 30 min and then at 30 °C for 30 min, and a good spherical like composite powder can be obtained, After 6 °C incubation at 1600 °C, the distribution of TiC in the matrix was uniform after SPS sintering, and the relative density of Ti-tungsten composites was 94.6%, the flexural strength reaches 739 MPa, the microhardness reaches 4.86 GPa, the fracture toughness reaches 7.87 MPa m1 / 2, perfectly solved the brittleness defect of tungsten.
To solve the problem of brittle tungsten, tungsten based alloy materials in the artificial sun will have a greater range of use, in fact, tungsten based materials is not only the main material of artificial sun wall, the main material is divertor.
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