Mechanical Properties of β-SiC Fabricated by Spark Plasma Sintering

Effects of carbon and oxygen on the spark plasma sintering additive-free densification and on the mechanical properties of nanostructured SiC ceramics

“…Fracture toughness value for SiC-C sample sintered at 2000 • C was also lower (2.4 MPa m 1/2 ) than the values for nanostructured samples of SiC found in the literature (3-4 MPa m 1/2 without C excess) [36,37]. Unlike our observations Raczka et al note an increase of the fracture toughness with the increase of carbon content.…”

“…Mechanical characterizations from Vickers indentation made in the center (black area) of the S-SiC sample sintered under 100 MPa show interesting properties with hardness at 2150 Hv and fracture [3,36,37] is not easy because the mechanical properties are very sensitive to the microstructure and to the composition of the SiC samples. Our results are similar to those obtained by Vassen et al [3] on SiC sintered with boron and carbon additives and with a density near 95%TD.…”

Mechanical properties of nanostructured silicon carbide consolidated by spark plasma sintering

“…4,12,14 In any case, the grain size refinement is well known to confer a superplastic behaviour at high temperature for most crystalline materials. 15 Such a property can be advantageously exploited to accommodate the progression of cracks and so to delay failure as much as possible.…”

“…As pointed out by several authors, [2][3][4][5][6][7][8][9] another promising way to enhance the mechanical performance might be the reduction of grain size down to the nanosize range. In the light of this, a large amount of works focusing on the synthesis and consolidation of bulk nanostructured silicon carbide was recently performed with regard to the Hall-Petch relation predicting a substantial increase in yield strength and hardness for nanoscaled microstructures.…”

Making Nanostructured Ceramics from Micrometer‐Sized Powders via Grain Refinement During SPS Sintering

“…Chen and Wang 13 proposed a two‐step processing technique to prepare nanostructured ceramics by kinetically separating the densification and grain growth to achieve minimum grain growth during densification. Recently, nanostructured ceramics were synthesized by sintering nano‐sized powders using spark plasma sintering (SPS) process, which can sinter materials to high density in a very short period to minimize grain growth 14–17 …”