Martin Grolms

New way to determine thermal shock behavior of ceramics

By Martin Grolms / July 29, 2013

Comparison of  experimental results with simulated results to determine the thermal shock behavior of ceramic materials shows excellent agreement. Credit: Wiley Materials Views. (Editor’s note: This article was originally published in Wiley Materials Views on July 17.) Until the 1950s, the most important ceramic materials were pottery, bricks and tiles, cements and glass. Because of the remarkable…

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Cell instructive material made from titanium oxide nanotubes

By Martin Grolms / July 23, 2013

[Editor’s note: this article originally appeared in Wiley Materials Views on July 3.] Highly ordered, vertically oriented titanium oxide nanotube arrays obtained by titanium anodization have attracted huge attention because of their outstanding material properties: great biocompatibility and cell growth enhancement, excellent optical and electrical characteristics, and unique nanotubular structures with tunable dimensions. By adjusting the anodization…

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How to knit silicon carbide fibers

By Martin Grolms / July 3, 2012

Woven silicon carbide fibers. Credit: Christian Heiss et al.; MaterialsViews/Wiley. Textile structures made from silicon carbide fibers are very interesting for manufacturing of fiber reinforced high temperature resistant ceramic matrix composites materials. To produce such textile structures a one or multi-step manufacturing processes like braiding, weaving, warp, or weft knitting is necessary. Depending on the fiber…

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Interlocking ceramic elements lead to quasi-plastic properties

By Martin Grolms / May 29, 2012

Display of self-interlocking elements from oxide ceramics. Assemblies of such elements possess an increased bending compliance compared to bulk plates. Cracks are confined to a few elements, so that most of the elements stay intact and are reusable. Credit: T. Krause et al.; Adv. Eng. Mater. For many high-temperature applications, ceramics are indispensable. No other…

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Reactive fillers to produce wollastonite bioceramics

By Martin Grolms / May 3, 2012

Examples of 3D wollastonite-based scaffold from preceramic polymers with reactive fillers. This sample from is from fused deposition, after ceramization. Credit: E. Bernardo et. al.; Adv. Eng. Mater. The main problem with the production of preceramic polymers is the formation of cracks and pores upon heat treatment. It is associated with the gas release and shrinkage occurring…

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Composite materials: Reinforcing metal with ceramics

By Martin Grolms / March 8, 2012

Sample metal–ceramic composite honeycomb macrostructures. Credit: C. Weigelt et al.; Adv. Eng. Mater. The combination of two or more different materials offers a range of advantages. Regarding crashworthiness, for instance, composite materials enable manifold possibilities for micro- and macrostructure designs. They can be adapted for the intended application and required characteristics. Crashworthiness is concerned with the absorption…

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Finding the perfect ink for printing ceramic parts

By Martin Grolms / October 20, 2011

Ink jet head. Credit: Wikipedia; Creative Commons license Ink jet printing techniques are applied with an increasing number of materials. In particular, solid freeform fabrication (SFF) methods for ceramic materials have attracted great interest in recent years. Methods such as stereo lithography, selective laser sintering and three dimensional printing produce complex geometries or parts with…

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University of Limoges developing composite ceramics for aeronautics applications

By Martin Grolms / August 4, 2011

ZrC-SiC materials from poly(methylvinylsilane) Credit Pizon, et al.; Advanced Engineering Materials. New advanced materials are often drivers of technologies, especially for aeronautics applications. Many materials have been developed to resist severe working conditions, which usually couple high-temperature and mechanical-stress corrosion resistance. For these applications, non-oxide ceramics are promising materials, particularly transition metal carbides, such as zirconium…

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Ceramics from alumina-loaded preceramic paper for lightweight applications

By Martin Grolms / August 1, 2011

Example of sintered alumina turbine, manufactured from alumina paper in previous work by Travitzky, et als. Credit: Paper Technology Foundation (PTS), Munich, Germany. Preceramic paper processing is an interesting novel approach for the manufacturing of lightweight ceramic components, as it can be used to create a wide variety of shapes and has the ability to form…

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Bioactive cement plaster: Bioengineering in action

By Martin Grolms / March 29, 2011

Electron micrographs of the cross-section of magnesium phosphate cement-cylinders. (a) MPC-cylinder without bacteria. (b) Macroporous structure within the inner section of freshly prepared MPC with embedded R. ruber bacteria. (c) Macroporous structure within the inner section of MPC with embedded R. ruber after 19 batch cycles. The arrows mark assemblies of R. ruber bacteria. Credit:…

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