POWDERED COMPOSITE MATERIAL BASED ON ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE FOR 3D PRINTING BY SELECTIVE LASER SINTERING (EMBODIMENTS) AND METHOD OF MANUFACTURING THEREOF (EMBODIMENTS) Russian patent published in 2024 - IPC C08F292/00 B33Y70/00 C08L23/06 C08K3/08 C08K3/22 C08K7/18 C08K7/20 B29C64/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to powder composite materials intended for 3D printing by layer-by-layer selective laser sintering. Disclosed is a powdered composite material based on ultrahigh molecular weight polyethylene for 3D printing by selective laser sintering, which is characterized by that it is obtained by in situ polymerisation by polymerisation of ethylene on the surface of filler particles, activated by a catalyst, to form a two-layer polymer coating on the surface of the filler particles, in which the first layer consists of UHMWPE with molecular weight of not less than 2.5⋅10⁶, and outer is made of polyethylene with molecular weight of 2.0⋅10⁴–5.0⋅10⁵, contains filler in amount of 70 wt.% and has the following characteristics: shape of particles of powder composite material is close to spherical with size from 7 mcm to 70 mcm, Hausner ratio is not more than 1.20; powder sintering window during selective laser sintering of not less than 7.5 °C; and a method of producing the disclosed powder composite material.

EFFECT: creation of powder composite material, which will have rheological and morphological characteristics presented to powders for SLS printing, as well as increased temperature range of sintering (sintering window).

8 cl, 3 dwg, 5 ex