Microstructure and mechanical properties of three-dimensional oxide/oxide composite fabricated by a slurry infiltration and sintering process

Slurry infiltration and sintering cycle‐dependent mechanical properties of 3D oxide/oxide ceramic matrix composites

“…The performance was relatively lower than that of our previous work, which had a slurry with a solid content of 40 vol%. 23 The aforesaid results confirm that the SIS process is an attractive approach to tailor the properties of the 3D oxide/oxide composites. The mechanical properties of the 3D oxide/oxide composites are far from their limits, and further experiments in the SIS process are required to meet engineering requirements for the oxide/oxide composites.…”

“…The 3D oxide/oxide composite was fabricated by the SIS process, as shown in our works. 22,23 The 3D reinforcement was first immersed in the matrix slurry in vacuum (−.1 MPa) for 4-6 h. The prepreg was molded in a vacuum bag (−.1 MPa) and then hot-pressed at 150 • C for 2 h. The infiltrated preform was sintered at 1100 • C for 1 h in air. After that, the SIS process was repeated for different cycles (three, six, and nine).…”

“…21,[30][31][32][33] It could be concluded that the flexural strength of the C6 composite was equivalent to those of the 2D composites, considering the pre-damaged fiber fabrics in the 3D fiber preform. 23 Due to the SIS cycle effect, the flexural modulus increased from 74.5 ± 2.8 GPa (the C3 composite) to 87.7 ± 3.1 GPa (the C9 composite). Figure 3c depicts the fracture surfaces of the C3 and C9 composites.…”

“…The enhanced elastic modulus of the matrix after several SIS cycles was also attributed to the increased interlaminar shear strength. 23 Figure 4c-e shows the propagating cracks observed by the macro-camera. It could be clearly observed that delamination cracks in the C3 composite were easily triggered and propagated along the fiber fabrics.…”

“…20 A slurry infiltration and sintering (SIS) process is proposed to fabricate the 3D oxide/oxide composite in our recent works. 22,23 It has been demonstrated that the SIS process is an efficient method to manufacture 3D oxide/oxide composites with enhanced delamination resistance. However, the effects of process parameters on the mechanical behaviors of the 3D oxide/oxide composites have not been fully investigated.…”