Paper Titles

Machining Cracks in Finished Ceramics
p.1

Edge Flaking - Similarity between Quasistatic Indentation and Impact Mechanisms for Brittle Materials
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Effect of Indenter Materials on Indentation Fracture of Alumina Ceramics
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Scratchability of Soda-Lime Silica (SLS) Glasses: Dynamic Fracture Analysis
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Fracture Toughness of Ceramic Materials and Its Relationship to Chipping Formation
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Strength and Fractography of Piezoceramic Multilayer Stacks
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Thermography and Simulation as a Combined Method for Failure Analysis of PTCs
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Fracture Origins in Miniature Silicon Carbide Structures
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Nanofractography of Alumina by Scanning Probe Microscopy
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 290Machining Cracks in Finished Ceramics

Machining Cracks in Finished Ceramics

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Abstract:

Grinding may create flaws that control strength and limit the performance of finished ceramics. Machining cracks sometimes have been difficult or impossible to find especially in toughened ceramics with interlocking grain microstructures that create rough fracture surfaces. Our fractographic examinations show that machining damage leaves telltale markings on fracture surfaces that may be easily detected using common fractographic techniques. A comprehensive study with over 400 ground rods and rectangular bars was conducted on several commercial silicon nitrides to study the effects of various machining conditions. Similarities and differences in behavior were observed. A paradoxical finding was that tougher silicon nitrides developed deeper grinding cracks. Machining crack size and shape strongly depended on the grinding wheel grit size.

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Fractography of Advanced Ceramics II

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Periodical:

Key Engineering Materials (Volume 290)

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1-13

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.290.1

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Online since:

July 2005

Authors:

George D. Quinn, Lewis K. Ives, S. Jahanmir

Keywords:

Fractography, Grinding Cracks, Machining Cracks, Surface Flaws

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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