Assessment of three oxide/oxide ceramic matrix composites: Mechanical performance and effects of heat treatments

被引：90

作者：

Volkmann, E. ^{[1
]}

Tushtev, K. ^{[1
]}

Koch, D. ^{[2
]}

Wilhelmi, C. ^{[3
]}

Goering, J. ^{[4
]}

Rezwan, K. ^{[1
]}

机构：

[1] Univ Bremen, D-28359 Bremen, Germany

[2] German Aerosp Ctr, Inst Struct & Design, Stuttgart, Germany

[3] EADS Innovat Works Airbus Grp Innovat, Munich, Germany

[4] German Aerosp Ctr, Inst Mat Res, Cologne, Germany

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2015年 / 68卷

关键词：

Ceramic-matrix composites (CMCs); Fracture toughness; High-temperature properties; EXPOSED ALUMINA FIBERS; WORK-OF-FRACTURE; BRITTLE MATERIALS; FATIGUE BEHAVIOR; NEXTEL(TM) 610; OXIDE FIBERS; STRENGTH; RESISTANCE; TOUGHNESS; TENSILE;

D O I：

10.1016/j.compositesa.2014.09.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Mechanical performance of three oxide/oxide ceramic matrix composites (CMCs) based on Nextel 610 fibers and SiOC, alumina, and mullite/SiOC matrices respectively, is evaluated herein. Tensile strength and stiffness of all materials decreased at 1000 degrees C and 1200 degrees C, probably because of degradation of fiber properties beyond 1000 degrees C. Microstructural changes in the composites during exposure at 1000 degrees C and 1200 degrees C for 50 h reduce their flexural strength, fracture toughness and work of fracture. A literature review regarding mechanical properties of several oxide/oxide CMCs revealed lower influence of fiber properties on composite strength compared with elastic modulus. The tested composites exhibit comparable stiffness and strength but higher fracture toughness compared with average values determined from a literature review. Considering CMCs with different compositions, we observed an interesting linear trend between strength and fracture toughness. The validity of the linear relationship between fracture strength and flexural toughness for CMCs is discussed. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：19 / 28

页数：10

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