Influence of the Morphology and Size of SiC Particles on the Mechanical Characteristics of SiC-Ceramics

The hot press method was used to obtain the SiC composite from different morphology and partial size powder. The starting SiC powder was: 1) fragmentation particle shape industrial charge of silicon carbide obtained by the Acheson method with sintering additive (9 wt.% Y2O3 − Al2O3) by Saint Gobain, 2) spherical particles SiC obtained by SHS in a laboratory. Bending strength, critical stress intensity factor, density, and the friction coefficient of samples of the obtained ceramics were determined. It has been established that the properties of ceramics obtained from SHS silicon carbide powder (spherical particles with sizes of 100–400 nm), due to better compaction, were at least 10% higher than samples from Saint Gobain powder: bending strength (400 ± 22 MPa), density (3.23 ± 0.01 g/cm3), critical stress intensity factor (К1С = 4.8 ± 0.3 MPa∙m1/2), friction coefficient (0.1126 ± 0.0031).