Sintering of powders in the CrSi2-Ti(Ta)Si2 systems depending on the methods for synthesis

Composite materials based on refractory silicides, in particular their solid solutions, are widely used in many areas of engineering for parts of heating elements and heat resistance protective coatings. This paper presents the findings obtained in the study of peculiarities of solid-phase interaction during synthesis of Cr0.9Ta0.1Si2 and Cr0.5Ti0.5Si2 solid solutions depending on the synthesis conditions. The effect of the powder dispersity on compaction of targets from Cr0.9Ta0.1Si2 and Cr0.5Ti0.5Si2 powders has been studied, and it has been established that the use of nanosized powders complicates the process of pressing. Also, sintering of targets from nanosized Cr0.9Ta0.1Si2 and Cr0.5Ti0.5Si2 powders was studied. The sintered targets were established to have a small grain size and uniform porosity all over the volume. Thanks to small closed porosity, the targets exhibit high heat resistance under thermal shock.