Additive manufacturing of continuous carbon fiber reinforced high entropy ceramic matrix composites via paper laminating, direct slurry writing, and precursor infiltration and pyrolysis. Issue 5 (1st March 2023)

• Record Type: Journal Article
• Authors: Zhang, Lu; Wang, Wenqing; Gao, Xiong; Li, Suwen; Gui, Kaixuan; Wang, Gang; He, Rujie
• Is Part Of: Ceramics international. Volume 49:Issue 5(2023)
• Page Start: 7833
• Page End: 7841
• Publication Date: 2023-03-01
• Subjects: Additive manufacturing -- Continuous carbon fiber reinforced ceramic matrix composites -- High entropy ceramic -- Microstructure -- Mechanical property; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.10.286
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this study, continuous carbon reinforced Cf /(Ti0.2 Zr0.2 Hf0.2 Nb0.2 Ta0.2 )C–SiC high entropy ceramic matrix composites were additively manufactured through paper laminating (PL), direct slurry writing (DSW), and precursor infiltration and pyrolysis (PIP). (Ti0.2 Zr0.2 Hf0.2 Nb0.2 Ta0.2 )C high entropy ceramic (HEC) powders were synthesized by pressureless sintering and ball milling. A certain proportion of HEC powder, SiC powder, water, binder, and dispersant were mixed to prepare the HEC-SiC slurry. Meanwhile, BN coating was prepared on the 2D fiber cloth surface by the boric acid-urea method and then the cloth was cut into required shape. Additive manufacturing were conducted subsequently. Firstly, one piece of the as-treated carbon fiber cloth was auto-placed on the workbench by paper laminating (PL). Then, the HEC-SiC slurry was extruded onto the surface of the cloth by direct slurry writing (DSW). PL and DSW process were repeated, and a Cf /HEC-SiC preform was obtained after 3 cycles. At last, the preform was densified by precursor infiltration and pyrolysis (PIP) and the final Cf /HEC-SiC composite was prepared. The open porosity of the Cf /HEC-SiC composites, with the HEC volume fractions of 15, 30 and 45%, were 7.7, 10.6, and 11.3%, respectively. And the density of the Cf /HEC-SiC composites, with the HEC volume fractions of 15, 30 and 45%, were 2.9, 2.7 and 2.3 g/cm 3, respectively. The mechanical properties of the Cf /HEC-SiC composites increased firstly and then decreased with the HEC content increase, reaching the maximum value when the HEC volume fraction was 30%. The mechanical properties of the Cf /HEC-SiC composites containing 45, 30 and 15% HEC were as follows: flexural strength (180.4 ± 14 MPa, 183.7 ± 4 MPa, and 173.9 ± 4 MPa), fracture toughness (11.9 ± 0.17 MPa m 1/2, 14.6 ± 2.89 MPa m 1/2, and 11.3 ± 1.88 MPa m 1/2 ), and tensile strength (71.5 ± 4.9 MPa, 98.4 ± 12.2 MPa, and 73.4 ± 8.5 MPa). From this study, the additive manufacturing of continuous carbon fiber reinforced high entropy ceramic matrix composites was achieved, opening a new insight into the manufacturing of ceramic matrix composites.