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Fibrous monolithic ceramic with a single alumina phase: Fracture and high‐temperature tribological behaviors
Author(s) -
Su Yunfeng,
Fan Hengzhong,
Zhang Yongsheng,
Song Junjie,
Chen Shuna,
Hu Litian
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16420
Subject(s) - materials science , ceramic , composite material , fabrication , fracture toughness , crystallite , microstructure , tribology , grain boundary , phase (matter) , fracture (geology) , toughness , metallurgy , chemistry , organic chemistry , medicine , alternative medicine , pathology
Fabrication of fibrous monolithic ceramic with bamboo‐like structures is a promising method to improve the mechanical properties of ceramics through extrinsic reinforcement. Nevertheless, heterogeneous boundaries are easily oxidized at high temperatures, which seriously limits the long‐term use of these materials when employed in high‐temperature and high/low‐temperature alternating environments. In this study, a “plain” ceramic—a single‐component and complex‐structure Al 2 O 3 ceramic—was successfully designed and prepared using nano‐sized Al 2 O 3 as polycrystalline fibers and micro‐sized Al 2 O 3 as boundaries to obtain a structure with a fibrous monolithic architecture. Self‐toughening of Al 2 O 3 ceramics can be achieved by introducing hierarchical architectures derived from the difference between grain sizes of fibers and boundaries, which gives the ceramics high fracture toughness and reliability. Moreover, the material demonstrated a low friction coefficient and high wear‐resistance properties when coupled with C/C composites at room temperature, 800°C, and in the alternating temperature enviroment between room temperature and 800°C.