NDLI: The effect of nano-sized sintering aids on toughening behavior of silicon nitride

Content Provider	Springer Nature Link
Author	Pasupuleti, Sriharsha Peddetti, Ramseshu Santhanam, Sridhar Jen, Kei Peng Wing, Zachary N. Halloran, Joseph P. Hecht, Mathias
Copyright Year	2008
Abstract	Processing plays an important role in determining the microstructure of silicon nitrides which in turn influences the mechanical properties, such as hardness and toughness. Sintering aids are an important processing parameter. The influence of the chemistry of sintering aids on properties of silicon nitrides is a well-explored subject. Here the size of sintering aids used and its impact on microstructure and mechanical properties is explored. Specifically the use of nano-scale versus micron-scale sintering aids is examined. Microstructures and mechanical properties for silicon nitrides hot-pressed with nano-sized sintering aids are compared with a reference silicon nitride hot-pressed with micron-sized sintering aids. Hardness and fracture toughness are determined at room temperature using hardness indents. Grain size and aspect ratio distributions are determined for the two silicon nitrides and their impact on mechanical properties are examined. Toughening behavior is studied by experimentally determining R-curves. Both toughness and toughening (R-curve) behavior are shown to improve with the use of nano-scale sintering aids.
Starting Page	2799
Ending Page	2805
Page Count	7
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	43
Issue Number	8
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2008-02-28
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Continuum Mechanics and Mechanics of Materials Polymer Sciences Characterization and Evaluation of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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