To make super-durable and strong details it is necessary to use so-called diamond composites, i.e. materials (matrixes) with incorporated tiny diamonds. The matrix is to be durable, strong, wear-proof as well as monolithic by structure ensuring chemical interaction with diamonds. To avoid internal tension this matrix must have physical characteristics close to diamond ones. In other case the detail will collapse under load.
Carbide materials fit all these requirements because they are strong, wear-proof, thermostable and with high thermal conductivity. High thermal conductivity prevents the detail cracking at a temperature drop (as a glass can crack when filling with boiling water). It is impossible to make such materials by sintering diamonds with silicon carbide, because the required temperatures are so high that diamond just will turn into graphite. The sintering diamond grains with carbide at lower temperature and high pressure (about 8.5 GPa) is a rather expensive process and it can be applied only for manufacturing small details of a simple shape.
The scientists from the Saint-Petersburg-based Central Research Institute of Materials and their colleagues from the Royal Institute of Technology (Stockholm) have invented a new method. They have proposed to press half-finished details (blanks) from the powder made of micron-sized diamonds. Then they heated the details in a vacuum oven and saturated them with liquid silicon. During this procedure the diamond surface turns into graphite-like carbon which interacts with liquid silicon. As a result the finished detail represents a monolith of the required shape which consists from small diamonds soldered one with another by silicon carbide, and silicon itself.
Olga Maksimenko | Informnauka
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19.09.2017 | Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
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Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
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For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems Holding GmbH about commercial use of a multi-well tissue plate for automated and reliable tissue engineering & drug testing.
MBM ScienceBridge GmbH successfully negotiated a license agreement between University Medical Center Göttingen (UMG) and the biotech company Tissue Systems...
Pathogenic bacteria are becoming resistant to common antibiotics to an ever increasing degree. One of the most difficult germs is Pseudomonas aeruginosa, a...
Scientists from the MPI for Chemical Energy Conversion report in the first issue of the new journal JOULE.
Cell Press has just released the first issue of Joule, a new journal dedicated to sustainable energy research. In this issue James Birrell, Olaf Rüdiger,...
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