Determination of the crack-tip toughness in silicon nitride ceramics

被引：14

作者：

Fuenfschilling, S. ^{[1
]}

Fett, T. ^{[1
]}

Hoffmann, M. J. ^{[1
]}

Oberacker, R. ^{[1
]}

Jelitto, H. ^{[2
]}

Schneider, G. A. ^{[2
]}

机构：

[1] Univ Karlsruhe, Inst Keram Maschinenbau, Karlsruhe, Germany

[2] Tech Univ Hamburg, Inst Keram Hochleistungswerkstoffe, Hamburg, Germany

来源：

JOURNAL OF MATERIALS SCIENCE | 2009年 / 44卷 / 01期

关键词：

Stress Intensity Factor; Y2O3; Silicon Nitride; Notch Root Radius; Silicon Nitride Ceramic;

D O I：

10.1007/s10853-008-3136-6

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Crack-opening displacements (COD) method was used to measure crack-tip toughness in silicon nitride Si3N4 ceramics containing (Y2O3,MgO) and (Y2O3, Al2O3). The R-curves for these materials were measured in a very stiff test device and four-point bending tests were carried out on notched bars of dimensions. Results for the first microns of crack propagation show that the R-curves raise very steeply reaching saturation already after a few μm crack extension. The semi-elliptical crack shape of Vickers cracks are found to develop in the unloading phase, characterized by the condition of crack-tip toughness at the crack tip after load removal. The crack-tip toughness for (Y2O3,MgO) is 2.33MPa√m and 2.033MPa√m for (Y2O3, Al2O3).

引用

页码：335 / 338

页数：4

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