Microstructure and mechanical properties of Si3N4f/BN/Si3N4 composites by joint processes of PIP and CVI

被引：7

作者：

Zhou, Jie ^{[1
]}

Ye, Fang ^{[1
]}

Cheng, Laifei ^{[1
]}

Wei, Yucong ^{[1
]}

Li, Mingxing ^{[1
]}

Meng, Nan ^{[1
]}

Cui, Xuefeng ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 844卷

基金：

中国国家自然科学基金;

关键词：

Si3N4f/BN/Si3N4; composites; PIP; CVI; Mechanical properties; High/low modulus matrices; SILICON-NITRIDE FIBER; MULTILAYERED MATRIX; BEHAVIOR; LIFETIME; DESIGN;

D O I：

10.1016/j.msea.2022.142988

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The three-dimensional silicon nitride (Si3N4) fiber-reinforced silicon nitride matrix (3D Si3N4f/BN/Si3N4) composites with boron nitride (BN) interphase were fabricated by joint processes of precursor infiltration and pyrolysis (PIP) and chemical vapor infiltration (CVI). The fracture morphologies and mechanical properties of Si3N4f/BN/Si3N4 composites with different PIP and CVI Si3N4 matrix content were studied. The composites with 50 vol% PIP matrix and 50 vol.% CVI matrix show the most optimal mechanical properties, especially the highest fracture toughness reported so far, whose flexural strength and fracture toughness are 198 +/- 15 MPa and 7.5 +/- 0.9 MPa center dot m(1/2), respectively. Meanwhile, the fracture characteristics were analyzed, and the strengthening and toughening mechanisms dominated by the fibers and high/low modulus matrices, corresponding to CVI/PIP matrices respectively, were also discussed. It is concluded that the multi-step fiber pull-out is conducive to improving both the strength and toughness, where the strengthening and toughening mechanisms include: (I) relieving stress and resisting crack propagation by high/low modulus matrices; (II) strengthening by short debonded fibers and toughening by long debonded fibers.

引用

页数：11

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