Interface controlled micro- and macro- mechanical properties of aluminosilicate fiber reinforced SiC matrix composites

详细信息    查看全文

• 作者：H.T. Liu^a ; ¹ ; ^{xzddlht@163.com" class="auth_mail" title="E-mail the corresponding author} ; L.W. Yang^b ; ¹ ; ^{yang.lingwei@imdea.org" class="auth_mail" title="E-mail the corresponding author} ; S. Han^a ; H.F. Cheng^a ; W.G. Mao^c ; J.M. Molina-Aldaregu&iacute ; a^b
• 关键词：Ceramic matrix composites ; Interfaces ; Fracture mechanics/toughness ; Strength
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：37
• 期：3
• 页码：883-890
• 全文大小：3664 K

文摘

Novel Nextel™ 440 aluminosilicate fiber reinforced SiC matrix composites, with/without chemical vapor deposited carbon interphase were fabricated by polymer derived ceramic process, and they were studied by a combination of micro- and macro- mechanical techniques such as nanoindentation, micropillar splitting, fiber push-in, digital image correction and high temperature three point bend tests. Specifically, micropillar splitting test was firstly employed to measure in-situ the localized fracture toughness. The results revealed that the carbon interphase can effectively hinder the interfacial reactions between Nextel™ 440 fiber and SiC matrix, thus remarkably weakening the composite interfacial shear strength from ∼293 MPa to ∼42 MPa, and enhance the composite fracture toughness from ∼1.8 MPa√m to ∼6.3 MPa√m, respectively. This is mainly a consequence of weak interface that triggers crack deflection at the fiber/interphase interface. Finally, this novel composite showed stable mechanical properties in vacuum at temperature range from 25 °C to 1000 °C.