Effects of Sintering Additives on Microstructure and Mechanical Properties of Hot-Pressed α-SiC Ceramics

Mechanical and Tribological Behaviors of Hot-Pressed SiC/SiCw-Y2O3 Ceramics with Different Y2O3 Contents

“…Therefore, various additives like Y 2 O 3 [10], La 2 O 3 [11], and RE(NO 3 ) 3 [12] (RE = rare earth element), etc., as well as the combination of Al 2 O 3 -RE 2 O 3 [13][14][15], AlN-RE 2 O 3 [16,17], and Er 2 O 3 -Y 2 O 3 [18] have been used in the sintering of SiC ceramics to improve its sinterability by liquid phase generation. Further, the Y 2 O 3 additive has been used in various ceramics, including SiC [19][20][21][22], Si 3 N 4 [23,24], TiC [25], ZrB 2 -SiC [26][27][28][29][30], AlN-SiC [31], WC [32][33][34], and cordierite [35], etc. Some references [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] mentioned that the Y 2 O 3 additive could promote the densification of the materials and influence their mechanical properties.…”

“…Further, the Y 2 O 3 additive has been used in various ceramics, including SiC [19][20][21][22], Si 3 N 4 [23,24], TiC [25], ZrB 2 -SiC [26][27][28][29][30], AlN-SiC [31], WC [32][33][34], and cordierite [35], etc. Some references [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] mentioned that the Y 2 O 3 additive could promote the densification of the materials and influence their mechanical properties. Cheng et al [25] presented that Y 2 O 3 can improve the mechanical properties of TiC ceramics by pinning at the grain boundary.…”

“…Zhang et al [26] discovered that appropriate Y 2 O 3 addition could eliminate surface oxides and suppress grain growth to promote the densification of ZrB 2 -SiC ceramics. Several articles [10,[19][20][21][22] reported that the Y 2 O 3 additive could improve the densification of SiC ceramics at a higher sintering temperature (1900-2000 • C) to achieve excellent performance. It demonstrates that Y 2 O 3 additions can accelerate the diffusion and mass transfer between the SiC matrix during sintering [12,20].…”

“…Several articles [10,[19][20][21][22] reported that the Y 2 O 3 additive could improve the densification of SiC ceramics at a higher sintering temperature (1900-2000 • C) to achieve excellent performance. It demonstrates that Y 2 O 3 additions can accelerate the diffusion and mass transfer between the SiC matrix during sintering [12,20]. However, a much higher temperature can deteriorate the mechanical properties by vaporizing the liquid phase and generating pores [36].…”