Influence of Y2O3 addition on electrical properties of β-SiC ceramics sintered in nitrogen atmosphere

Tribological characteristics of SiC ceramics sintered with a small amount of yttria

“…2c) consisted of equiaxed grains and bright secondary phase because of the suppression of the β-α phase transformation of SiC during hot-pressing and larger amount of sintering additive (Y 2 O 3 ). The bright phase present along the boundaries and at triple point junctions of SiC grains in the 3Y-SiC is believed to be Y 2 O 3 phase, as identified in a previous work [29]. The average length and width of SiC grains in 0.2Y-SiC are 4.36 mm and 2.09 mm, respectively.…”

Effects of Y2O3–RE2O3 (RE = Sm, Gd, Lu) Additives on Electrical and Thermal Properties of Silicon Carbide Ceramics

“…In a previous study of highly conductive SiC ceramics, the carrier density of SiC ceramic sintered with 3.1% Y 2 O 3 (3.1Y–SiC) was 1.1 × 10 20 cm −3 , higher than that (5.2 × 10 19 cm −3 ) of the SY specimen. The difference in carrier density between the two SiC specimens sintered with a Y 2 O 3 additive is attributable to the difference in grain size because the nitrogen doping occurred during the growth of SiC grains via solution‐reprecipitation .…”

“…The difference in carrier density between the two SiC specimens sintered with a Y 2 O 3 additive is attributable to the difference in grain size because the nitrogen doping occurred during the growth of SiC grains via solution‐reprecipitation . The grain sizes of the 3.1Y–SiC and the SY specimens were 10 and 4.0 μm, respectively. The larger grain size of 3.1Y–SiC was due to the addition of 5 wt% in situ synthesized nano‐sized SiC and the higher sintering temperature (2050°C) for a longer holding time (6 h) at higher temperature than the present SY specimen (2000°C for 3 h).…”

Electrical and Thermal Properties of SiC Ceramics Sintered with Yttria and Nitrides

“…Nitrogen (N) has been shown to be a good dopant for increasing the electrical conductivity in bulk SiC ceramics. Recently, highly conductive SiC ceramics were successfully fabricated by hot‐pressing SiC powders with yttria (Y 2 O 3 ) as a sintering additive . Bulk SiC specimens pressed at 40 MPa and 2050°C for 6 h in a nitrogen atmosphere exhibited electrical resistivity as low as 8 × 10 −3 Ω·cm at room temperature .…”

“…Recently, highly conductive SiC ceramics were successfully fabricated by hot‐pressing SiC powders with yttria (Y 2 O 3 ) as a sintering additive . Bulk SiC specimens pressed at 40 MPa and 2050°C for 6 h in a nitrogen atmosphere exhibited electrical resistivity as low as 8 × 10 −3 Ω·cm at room temperature . The sintered SiC specimens were found to contain a Y 2 O 3 phase segregated at the boundaries between SiC grains.…”