Effect of Sintering Temperature on the Properties of Highly Electrical Resistive SiC Ceramics as a Function of Y2O3-Er2O3 Additions

Materials

卷:13

Sheng Ge¹  Zhengren Huang¹  Xuejian Liu¹  Yingying Liu¹  Hang Duan¹  Xiumin Yao¹ 

[1] Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;

关键词: SiC ceramics;    spark plasma sintering;    electrical resistivity;    thermal conductivity;   

DOI  :  10.3390/ma13214768

来源: DOAJ

【 摘 要 】

Silicon carbide (SiC) ceramics with Y₂O₃-Er₂O₃ as sintering additives were prepared by spark plasma sintering (SPS). The effects of sintering temperatures and Y₂O₃-Er₂O₃ contents on the microstructure, thermal conductivity, electrical, and mechanical properties were investigated. The increasing of sintering temperatures promoted the densification of SiC ceramics, thus increasing the thermal conductivity and electrical resistivity. With the increase of the sintering additive contents, the electrical resistivity increased due to the formation of the electrical insulating network; and the thermal conductivity first increased and then decreased, which was related to the content and distribution of the secondary phase among the SiC grains. The SiC ceramics sintered at 2000 °C with 9 wt.% Y₂O₃-Er₂O₃ exhibited higher electrical resistivity and thermal conductivity, which were 4.28 × 10⁹ Ω·cm and 96.68 W/m·K, respectively.

【 授权许可】

Unknown