METHOD AND DEVICE FOR PRODUCING TUNGSTEN ARTICLE BY LAYER-BY-LAYER APPLICATION OF TUNGSTEN Russian patent published in 2018 - IPC C23C16/14 C23C16/455 B33Y10/00 B33Y30/00 B33Y70/00 

FIELD: metallurgy.

SUBSTANCE: scanning of isothermally heated horizontal plane of article under formation corresponding to section of 3D model is conducted, a dosed discrete-point jet feeding of gaseous tungsten hexafluoride and hydrogen gas to said plane is carried out, subsequent vertical movement of the scanned plane with a solid surface applied to it by interaction of said initial components on a given pitch down and scanning in accordance with the subsequent configuration of the section of the 3D model. Discrete-point supply of tungsten hexafluoride is carried out by means of a central jet. Hydrogen is supplied by a peripheral coaxial jet around jet of tungsten hexafluoride. Said discrete-point application of tungsten is carried out in two stages, at first of which feeding of mentioned initial gas components is carried out in stoichiometric ratio, and at the second one supply of tungsten hexafluoride is suspended when supplying hydrogen. Device for realisation of said method includes a tank with an open upper end where horizontal substrate is placed for obtaining a tungsten product and which is fixed on a vertical lift, a two-coordinate scanning device located above the tank and connected with a branch pipe for feeding the starting components in the form of gaseous tungsten hexafluoride and hydrogen gas. The supply branch pipe for said starting components supply includes an external branch pipe for supplying hydrogen gas, inside which there is a coaxial central branch pipe for gaseous tungsten hexafluoride supply. Said central branch pipe is provided with a device for monitoring and controlling the flow rate and temperature of gaseous tungsten hexafluoride, and a cutoff valve for feeding tungsten hexafluoride electrically connected to the microprocessor, made with the possibility of controlling the cut-off valve of the supply of the hexafluoride. The horizontal substrate is equipped with an electric heater that maintains the temperature of the upper surface of the article under formation within the specified limits. Aspiration device arranged in side surface of said tank is made in form of tubular element located along perimeter of the upper part of the tank side surface and have suction holes or slit. Outlet branch pipe of the aspiration device is connected to the suction branch pipe of the blowing device.

EFFECT: provided method and devices enable production of coatings or articles of tungsten at temperatures of 300-375 degrees without metallurgical processes, plastic deformation and mechanical treatment with the use of not only inert gas, but also air as a gas medium in the working volume of the device.

3 cl, 1 dwg