The enhanced mechanical properties of SiC nanowires/ Ba0.75Sr0.25Al2Si2O8 ceramics with embedded SiO2 interface

被引:5
作者
Li, Xin [1 ]
Fan, Xiaomeng [1 ]
Luo, Haojie [1 ]
Lu, Xiaoke [2 ]
Xue, Jimei [1 ]
Ye, Fang [1 ]
Liu, Yongsheng [1 ]
机构
[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Peoples R China
[2] Xi An Jiao Tong Univ, Frontier Inst Sci & Technol, Xian 710049, Peoples R China
来源
JOURNAL OF ADVANCED CERAMICS | 2024年 / 13卷 / 07期
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
multiphase ceramics; SiO; 2; interface; densification; mechanical properties; ENVIRONMENTAL BARRIER COATINGS; SYSTEM BAO-AL2O3-SIO2; DIELECTRIC-PROPERTIES; CRACK DEFLECTION; MICROSTRUCTURE; COMPOSITES; OXIDATION; STRENGTH; BN; BAOAL(2)O(3)2SIO(2);
D O I
10.26599/JAC.2024.9220907
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
In this work, low-softening-temperature and low-modulus SiO2 2 was introduced as an embedded interface between SiC nanowires (SiCnws) and a BaxSr1-xAl2Si2O8 x Sr 1- x Al 2 Si 2 O 8 ceramic matrix to enhance strength and toughness of the ceramic. During the sintering process, molten SiO2 2 enhances the flowability of the ceramic powders and modifies the dispersion of SiCnws. The strengthening effect of SiCnws was fully realized, and the flexural strength of the optimized ceramics reached 193 +/- 16 MPa, which represents an increase of 52.6%. After the formation of the embedded SiO2 2 interface with a low modulus, cracks can deflect along the SiCnws surface, which is consistent with the criterion of He and Hutchinson. This can effectively extend the crack propagation path, and the fracture toughness ( ) is thus improved by 94.0%, reaching K IC 3.1 +/- 0.5 MPa<middle dot>m1/2. 1/2 .
引用
收藏
页码:933 / 941
页数:9
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