New liquid processing of oxide/oxide 3D wowen ceramic matrix composites

Abstract

In this work, a novel process named Flexible Injection Process (FIP) was developed to manufacture near‐net shape oxide/oxide composites reinforced with 3D interlock fibers. This process uses a flexible membrane to apply pressure to promote transverse impregnation of the fibrous reinforcement by a slurry charged with sub‐micron ceramic particles. Due to the through‐thickness filtration and compaction, FIP process is much faster than typical in‐plane impregnation and results in composites with lower residual porosity than those produced by traditional processes. In this study, a mathematical modeling of the impregnation in FIP was developed and compared to experimental infiltration experiments. Furthermore, ceramic matrix composites (CMCs) produced by FIP were compared to composites manufactured via an established RTM‐like process. The two molding processes were compared to determine if the different flow behaviors have an impact on material densification, porosity formation, mechanical properties, and manufacturing time. CMCs produced by both methods resulted in similar microstructures, as determined by mercury intrusion porosimetry, even if FIP composites were marginally less porous. Finally, a comparison of mechanical properties resulting from the two manufacturing methods has shown a similar behavior. Thus, the main advantages of FIP molding were identified to be the shorter cycle time and the robustness of the impregnation compared to RTM‐like processes.

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

“…15 Even though there has been a sea of investigations about the 3D oxide/oxide composites, their mechanical properties are much lower than those of the 2D composites. [16][17][18][19][20] For instance, the 2D composite fabricated by slurry infiltration has a flexural strength of 393.4 MPa, 21 while the 3D composite fabricated by sol-gel process has a flexural strength of nearly 150 MPa. 20 A slurry infiltration and sintering (SIS) process is proposed to fabricate the 3D oxide/oxide composite in our recent works.…”

“…A three‐dimensional (3D) fiber preform can effectively depress the delamination 15 . Even though there has been a sea of investigations about the 3D oxide/oxide composites, their mechanical properties are much lower than those of the 2D composites 16–20 . For instance, the 2D composite fabricated by slurry infiltration has a flexural strength of 393.4 MPa, 21 while the 3D composite fabricated by sol–gel process has a flexural strength of nearly 150 MPa 20 …”

Effects of Volume of Carbon Nanotubes on the Angled Ballistic Impact for Carbon Kevlar Hybrid Fabrics

“…Reinforcing composite panels affects their mechanical properties as well as their weight, which are two crucial considerations for a wide range of applications such as the process of responsibility of naval vessels designers, armored vehicle designers and manufacturers, aircraft designers, etc. [1][2][3][4][5][6]. Due to effective behavior and safe performance, the use of CNT/Epoxy composites as materials for structural design of vehicles and other constructions has led to the requirements of sustaining them.…”