In this paper were considered the rheological characteristics of Si3N4 powders and the mixture of Si3N4 powders with sintering additive based on CaO-Al2O3. The dependence of optimal density on the applied stress during pressing was established. The powders compressibility coefficients were studied. It was shown that upon addition of a sintering additive CaO-Al2O3 the compressibility coefficient decreases and the compressibility modulus increases.
The hot press method obtained 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.% Y 2 O 3 − Al 2 O 3 ) by Saint Gobain, 2) spherical particles SiC obtained by SHS in a laboratory. Bending strength, critical stress intensity factor, density, the friction coe cient 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/cm 3 , critical stress intensity factor К 1С = 4.8 ± 0.3 MPa•m 1/2 , friction coe cient 0.1126 ± 0.0031.
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