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Spiral fibers were considered to be an ideal toughening phase of ultra-high torsional release effect. In this work, ZrB2 (Z)–20 vol% SiC (S) spiral fiber (ZSsf) with controllable structure was prepared by a combination approach of liquid rope effect and non-solvent-induced phase separation. Dominantly depended on the kinematic viscosity (η), dropping height (H), and flow rate (Q), the geometric parameters of ZSsf involving filament diameter (d) and coil diameter (D) were followed the relationship of d ≈ 0.516×10−3Q1/2H−1/4 and D ≈ 0.25×10–3(Q/H)1/3, respectively, within the optimized η of 10–15 Pa·s. Three different microstructures of ZSsf were achieved by adjusting the polymer/solvent/non-solvent system assisted with phase diagram calculation, including dense, hollow, and hierarchical pore structures. The ZrB2–SiC with 1 wt% ZSsf composites prepared by hot isostatic pressing (HIP) exhibited a ~30% increase in fracture toughness (KIC, 4.41 MPa·m1/2) compared with the ZrB2–SiC composite, where the microscopic fracture toughness of the ZSsf was ~80% higher than that of the matrix. The fibers with a ~10 nm in-situ-synthesized graphite phase amongst grain boundaries of ZrB2 and SiC changed the fracture mode, and promoted the crack deflection and pull-out adjacent the interface of matrix and the fiber.


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ZrB2–SiC spiral fibers prepared by combining liquid rope effect with non-solvent-induced phase separation method: A promising toughening material for ultra-high temperature ceramics

Show Author's information Ruiji ZHANGa,bFangwei GUOa,b( )Xing ZHANGb,cWenchen ZHANGaLi HUb,cDesheng LIUaXiaofeng ZHAOaXin WANGd
Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Shanghai Key Laboratory of Spacecraft Mechanism, Shanghai 201108, China
Shanghai Institute of Aerospace System Engineering, Shanghai 201108, China
Konca Solar Cell Co., Ltd., Wuxi 214174, China

Abstract

Spiral fibers were considered to be an ideal toughening phase of ultra-high torsional release effect. In this work, ZrB2 (Z)–20 vol% SiC (S) spiral fiber (ZSsf) with controllable structure was prepared by a combination approach of liquid rope effect and non-solvent-induced phase separation. Dominantly depended on the kinematic viscosity (η), dropping height (H), and flow rate (Q), the geometric parameters of ZSsf involving filament diameter (d) and coil diameter (D) were followed the relationship of d ≈ 0.516×10−3Q1/2H−1/4 and D ≈ 0.25×10–3(Q/H)1/3, respectively, within the optimized η of 10–15 Pa·s. Three different microstructures of ZSsf were achieved by adjusting the polymer/solvent/non-solvent system assisted with phase diagram calculation, including dense, hollow, and hierarchical pore structures. The ZrB2–SiC with 1 wt% ZSsf composites prepared by hot isostatic pressing (HIP) exhibited a ~30% increase in fracture toughness (KIC, 4.41 MPa·m1/2) compared with the ZrB2–SiC composite, where the microscopic fracture toughness of the ZSsf was ~80% higher than that of the matrix. The fibers with a ~10 nm in-situ-synthesized graphite phase amongst grain boundaries of ZrB2 and SiC changed the fracture mode, and promoted the crack deflection and pull-out adjacent the interface of matrix and the fiber.

Keywords: fracture toughness, ultra-high-temperature ceramics (UHTCs), spiral fibers, liquid rope effect, structure control

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Received: 20 July 2022
Revised: 20 September 2022
Accepted: 06 October 2022
Published: 23 December 2022
Issue date: January 2023

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© The Author(s) 2022.

Acknowledgements

This work was financially supported by the Science and Technology Innovation Program of Shanghai in 2020 (Grant No. STCSM-20520714300), the National Natural Science Foundation of China (Grant No. U19A2099), National Major Science and Technology Projects of China (Grant No. J2019-VIII-0003-0165), and Open Project of Shanghai Key Laboratory of Spacecraft Mechanism.

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