Fabrication of three-dimensional carbon fiber preform reinforced YAG composites from a sol with high solid content

Shan, Borong; Ma, Qingsong; Zeng, Kai

doi:10.1016/j.ceramint.2017.11.171

Cited by 6 publications

(2 citation statements)

References 30 publications

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“…Using 3D carbon fiber preform as reinforcement, the authors have fabricated 3D C/Al 2 O 3 [19] and C/YAG (yttrium aluminum garnet, Y 3 Al 5 O 12 ) [20,21] composites through the SIDH route. The former studies indicated that the characteristics of sol and the structure of fiber preform had great influence on the processing and mechanical properties of 3D fiber composites.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the compositions of Al 2 O 3 sol and Y 2 O 3 -Al 2 O 3 sol, the Al 2 O 3 and Y 2 O 3 -Al 2 O 3 gel powders exhibited different sintering shrinkage behaviors. Although the ceramic yield and viscosity of the two sols were almost the same, the fabrication of C/Al 2 O 3 and C/YAG composites with the same reinforcement needed different sintering schedule and SIDH cycles, and the as-received composites had different total porosity and mechanical properties [19,20]. For C/YAG composites, even if the sol and the processing were the same, different carbon fiber preforms resulted in different microstructure and mechanical properties because of the different fiber distribution and pore structure [20,21].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties and thermal stability of carbon fiber cloth reinforced sol-derived mullite composites

Zhang

Zeng

et al. 2019

J Adv Ceram

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For the wide application as thermal protection materials, it is very necessary for mullite ceramics to improve fracture toughness. In this paper, the laminated and stitched carbon fiber cloth preform reinforced mullite (C/mullite) composites were prepared through the route of sol impregnation and heat treatment using the Al 2 O 3 −SiO 2 sol with a high solid content as raw materials. The C/mullite composites showed a flexural strength of 228.9 MPa that was comparable to that of dense monolithic mullite although the total porosity reached 13.4%. Especially, a fracture toughness of 11.2 MPa•m 1/2 that was 4-5 times that of dense monolithic mullite was obtained. Strength deterioration due to the carbothermal reduction between carbon fiber and the residual SiO 2 in matrix was found above 1200 ℃. A pyrolytic C (PyC) coating was deposited on carbon fibers as interfacial coating. The chemical damage to carbon fibers was obviously alleviated by the sacrifice of PyC coating. Accordingly, the C/PyC/mullite composites kept strength unchanged up to 1500 ℃, and showed much higher strength retention ratio than C/mullite composites after annealing at 1600 ℃.

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Section: Introductionmentioning

confidence: 99%