Parameters of Sintered Porous Structures made of the Mixture of Sponge Titan and Aluminium Powders

摘要

The way to improve the strength of sintered compact high density parts obtained by compaction and sintering of titanium powder by the way of incorporation of powder aluminium additives into feedstock is well known. The investigation results regarding the change in porous structure parameters - porosity, average and maximal pore sizes depending upon the feedstock powder aluminium content in the range of 0,25-3 weight percentage are presented in the given paper. The pictures of microstructure of samples, the investigation results on the process of its sintering on dilatometer are shown. It is demonstrated that the optimal aluminium content in porous titanium powder based material constitutes 0,5-1,5 weight percentage, at the same time, as for high density parts, it is notably higher, that is 4-6 weight percentage. If the given optimal aluminium content is present, the strength of alloyed porous samples is by 1,8-2,4 times higher and sintering temperature is lower by 70°C in comparison with porous samples obtained from initial titanium powder of the same grade and sizes of particles and close values for porosity and sizes of pores.