Microstructure and mechanical properties of B4C matrix composites prepared via hot-pressing sintering with Pr6O11 as additive

Microstructure evolution and performance of B4C–NdB6 composites fabricated by in situ hot pressing

“…Sairam et al 22 . and Yang et al 18,19 . also found that the residual pores caused by the gas release when sintering B 4 C with Eu 2 O 3 , La 2 O 3 , or Pr 6 O 11 .…”

“…However, as the content of Nd 2 O 3 is excessive (≥4 wt%), lots of gas are released from the neighborhood of the contact area of Nd 2 O 3 and B 4 C, and the later densi-fication process cannot eliminate the pores caused by the released gas, resulting in the residual pores which is near the formed NdB 6 . Sairam et al 22 and Yang et al 18,19 of intermediate gray. From Figure 13, it can be seen that NdB 6 grows apparently, and both the size and quantity of NdB 6 phase increase with the increasing Nd 2 O 3 content.…”

“…Sun et al 17 also verified 4 wt% CeO 2 addition could significantly improve the densification and mechanical properties of B 4 C ceramics, especially for hardness, which could reach higher than 40 GPa. Yang et al obtained high-performance B 4 C-LaB 6 18 and B 4 C-PrB 6 19 composites with 4 wt% La 2 O 3 or 4 wt% Pr 6 O 11 addition, respectively. The fracture toughness, Vickers hardness, and flexural strength of B 4 C-LaB 6 18 and B 4 C-PrB C; however, the microstructure evolution of B 4 C ceramics doped with Nd 2 O 3 with sintering temperature, which involves the diffusion, mass transfer, and densification process, has not been detailedly investigated.…”

“…obtained high‐performance B 4 C–LaB 6 18 and B 4 C–PrB 6 19 composites with 4 wt% La 2 O 3 or 4 wt% Pr 6 O 11 addition, respectively. The fracture toughness, Vickers hardness, and flexural strength of B 4 C–LaB 6 18 and B 4 C–PrB 6 19 composites in the abovementioned two researches reached 4.92 MPa m 1/2 /4.40 MPa m 1/2 , 39.08 GPa/37.60 GPa, and 350 MPa/339 MPa, respectively. Wang et al 20 .…”

Strengthening and toughening of CNTs‐reinforced B4C‐SiC ceramic composite material via spark plasma sintering

“…1,2 However, pure B 4 C ceramics have problems such as poor strength, fracture toughness and low relative density, which have become significant factors restricting its widespread application. 3,4 To improve the mechanical properties and the relative density, method such as introducing phases like TiB 2 , SiC and other reinforcement phases is commonly used to achieve this goal. 5,6 In addition, carbon nanotubes (CNTs) with their high surface area, strength and stiffness, good thermal stability, and conductivity have become an ideal choice for reinforcing phase selection.…”