METHOD OF LAYER ELECTRON-BEAM SINTERING OF PRODUCTS FROM CERAMIC POWDER Russian patent published in 2017 - IPC C04B35/64 B22F3/105 B33Y10/00 

FIELD: electricity.

SUBSTANCE: in the sintering method containing the operations of depositing and aligning the powder layer, as well as electron irradiation of the applied layer, two electron sources are used that form two electron beams with an energy of 10-15 keV, one of which is defocused and irradiates the entire layer of powder, and the second beam is focused and scans the sintered area of the powder layer. Irradiation is performed in the range of inert gas pressure of 5-20 Pa. In the method, the preheating stage of the powder layer is eliminated, since a pressure range of 5-20 Pa ensures the formation of a beam plasma through which the electric charge brought by the electron beam flows from the powder particles to the grounded walls of the vacuum chamber. The uniformity of heating is achieved by continuous irradiation of the entire powder layer with a defocused electron beam, which ensures that the temperature is not sufficient for sintering. The addition of the power of the scanning focused beam ensures sintering according to the given pattern.

EFFECT: reduction of the time spent on layer-by-layer electron-beam sintering of ceramic powder products while ensuring uniform heating of each layer of ceramic powder.

1 dwg, 1 ex