Low temperature diffusion welding method of tungsten alloy and tantalum alloy, the steps of the method include: (1) workpiece surface cleaning steps: tungsten alloy, tantalum alloy processing to the specified size, remove them and the middle layer - nickel foil to be welded surface oxidation layer; (2) Workpiece assembly steps: place the middle layer - nickel foil between tungsten alloy and tantalum alloy to construct the welder workpiece; (3) Vacuum diffusion welding steps: put the welder parts into the vacuum diffusion welding furnace, heat and keep warm. When the heat preservation begins, apply axial pressure on the welder parts. After the heat preservation, remove the pressure and cool with the furnace. The invention can overcome the problem that the existing welding technology cannot realize high-quality diffusion welding of tungsten alloy and tantalum alloy at low temperature, especially suitable for reliable and precise diffusion welding between tungsten alloy and tantalum alloy at low temperature, and the tungsten and tantalum welding body prepared can be used in dynamic high pressure physics and nuclear fusion and other research fields.
High-density tungsten alloy has a series of excellent properties such as high density, high strength, good ductility, good machining performance, low linear expansion coefficient, high thermal conductivity, good oxidation and corrosion resistance, good weldability and so on. These excellent properties make it widely used in high-tech fields, military and civil industries, such as balance weight components, conventional components, ray shielding materials, etc. Among them, high-density tungsten alloy has good rigidity and easy shape maintenance, which is an ideal nuclear fuel storage and radiation shielding material. At the same time, W-Ni-Fe alloy has a series of excellent properties, such as high melting point, good impact toughness, high plasticity and low yield strength, can be used to manufacture a thin-walled large chain shell, as a functional composite material used in atomic energy explosion, to ensure the normal operation of the instrument.
Tantalum alloy with high density, high melting point, good corrosion resistance, excellent high temperature strength, workability, weldability and low plastic/brittle transition temperature, excellent dynamic mechanical properties and surface density, stable, high dielectric constant of the amorphous oxide film and other characteristics, widely used in electronic, chemical, aerospace, weapons, and other fields. So in order to more fully play their respective advantages of the high density tungsten alloy and tantalum alloy, in the high-tech fields such as aerospace, dynamic high-pressure physics, nuclear fusion, has important applications in areas such as weapons, and to adopt effective welding technology, to obtain high quality high density tungsten alloy and tantalum alloy welded joint of dissimilar metal materials.
