FIELD: metallurgy.
SUBSTANCE: here is disclosed powder corresponding to composition with more retarded semi-period of crystallisation, due to which it can be implemented in die casting. Powder consists of at least two sections. The first section with the biggest surface area contacting air contains the first crystallising thermo-plastic resin (polymer). The second section contains the second crystallising thermo-plastic resin (polymer). At least a part of the second section is positioned between centroid of powder and the second section. Viscosity of melt of the first resin (polymer) differs from viscosity of melt of the second resin (polymer); in particular, viscosity of melt of the second resin (polymer) is higher, than viscosity of melt of the first resin (polymer). Also there is disclosed procedure for production of divided to sections powder with lowered gradient XB. Procedure consists in production of powder divided into sections. Further the first crystallising thermoplastic polymer is crystallised. Powder is heated at presence of moving force at temperature within an interval from 140°C to temperature at 1°C below temperature whereat the first crystallising thermo-plastic polymer turns into liquid. Finally powder is cured in temperature range at presence of moving force during time interval sufficient for raise of characteristic viscosity at least at 0.05 dcl/g.
EFFECT: produced sectioned powder possesses more prolonged semi-period of crystallisation, than homogenous mixture, facilitating decreased cycle of die casting in comparison to equivalent homogenous mixtures.
35 cl, 4 dwg, 6 tbl
