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grain boundaries

Lasers control single crystal formation in chalcogenide glasses

By April Gocha / April 12, 2016

A Lehigh University team of scientists has devised a new fabrication method that could extend the reach of single crystals by ditching the need for melting.

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Other materials stories that may be of interest

By April Gocha / February 17, 2016

Graphene’s toughness in question, molybdenum disulfide memristors, and other materials stories that may be of interest for February 17, 2016.

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Other materials stories that may be of interest

By April Gocha / February 3, 2016

Electron transport across grain boundaries, graphene balls lubricate automobile engines, and other materials stories that may be of interest for February 3, 2015.

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Ceramic double duty: Bifunctional material affords chiton shells strength and visibility with built-in eyes

By April Gocha / December 16, 2015

Ivy league researchers now show that mollusks called chitons have an interesting feature to adapt to their life under the sea—hundreds of tiny ceramic eyes integrated in and scattered across their strong aragonite shells.

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Nanoscale intergranular films shed light on grain boundary behavior

By Eileen De Guire / May 26, 2011

During one of their studies, grain boundary researchers began with gold films broken into particles (via annealing) dispersed across a sapphire substrate. Credit: Baram, et al; Technion. Materials scientists have long recognized that grain boundaries and interfaces can limit a material’s bulk properties, especially at high temperatures. Significant research effort has gone into understanding their nature with an eye to…

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Sintering in a flash? Researchers show its possible to do it in seconds with nanograin YSZ, heat and dc electric field

By / October 13, 2010

Talk about tantalizing tidbits of technology! There is a new article available online that reports on research showing that green-density yttrium-stabilized zirconia can be sintered to full density in only a few seconds at 850°C, when subjected to a dc electrical field above a critical threshold. For a sense of what a radical difference this…

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Will DC electric fields transform ceramics shaping, manufacturing?

By / April 7, 2010

According to a paper just published in Philosophy Magazine, researchers at North Carolina State University, who have been playing around with how ceramic materials behave in the presence of DC electric fields, apparently think they may have discovered an approach that could “revolutionize” ceramics manufacturing. At a minimum, they say that using a modest electric…

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Mechanical Properties of Nanolaminate Ti3SnC2 Carbide Determined by Nanohardness Cartography

By / January 28, 2010

Volume 93 Issue 2, Pages 330 – 333 Christophe Tromas, Nadia Ouabadi, Véronique Gauthier-Brunet, Michel Jaouen, Sylvain DuboisPublished Online: Dec 8 2009 3:42PMDOI: 10.1111/j.1551-2916.2009.03412.x ABSTRACT Nanoindentation is used to measure hardness of Ti3SnC2, a recently synthesized nanolaminate carbide. Hardness cartography and optical microscopy are used to correlate hardness values and sample phases. An indentation size…

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The Emergence of Intergranular Precipitates in TiO2-Doped alpha-Al2O3 Ceramics

By / January 28, 2010

Volume 93 Issue 2, Pages 326 – 329 Pengxiang Qian, Hui Gu, Miaofang ChiPublished Online: Nov 23 2009 6:57PMDOI: 10.1111/j.1551-2916.2009.03410.x ABSTRACT The minor phase accumulated at intergranular regions in ceramics is usually associated with the global doping level of additives; however, such simplification often undermines the local variation in liquid composition that leads to the…

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Degradation of Refractory Bricks Used as Thermal Insulation in Rotary Kilns for Iron Ore Pellet Production

By / January 28, 2010

Volume 6 Issue 6, Pages 717 – 726 Jesper Stjernberg, Marta-Lena Antti, Lars-Olof Nordin, Magnus OdénPublished Online: Nov 5 2008 3:13PM DOI: 10.1111/j.1744-7402.2008.02318.x ABSTRACT Degradation of bricks in an iron ore pellet producing kiln has been investigated. Lab-scale tests of brick/slag interaction performed under different temperatures, atmospheres, and alkali additions show that addition of alkali…

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