Advanced materials like AlTiC, sapphire and SiC are now commonly used in many devices. One popular area that they are applied in is read/write head sliders for computer hard drives. A major practical problem with the use of these materials is that they are extremely difficult to machine, and the advanced applications they are used in require precise tolerances for finished dimensions.
The small components are cut from larger wafers of material using systems that have constant feed speeds. However performance of the dicing blades degrades over time due to the deterioration of their surface conditions, i.e., dislodgment or dullness of abrasive grains, deformations and abrasion of the matrix material. This alters the grindability or cutting performance of the blades. A better understanding of the mechanisms governing grindability could be applied to producing better components machined from very hard materials.
A team of Japanese researchers, Takuya Adachi, Koji Matsumaru and Kozo Ishizaki, from Nagaoka University of Technology have developed a constant feeding-force system, which enables the grindability of a grinding wheel to be analysed. Under constant feeding-force system, the feeding speed alters during processing, which depends on the surface conditions of a grinding wheel, and indicates its grindability.
In this study, the theoretical grindability of dicing blades was estimated by establishing a new model for feeding speeds under constant feeding-force dicing systems. The model was evaluated by comparing empirical and theoretical dicing speeds for different abrasive grain sizes. The researchers were able to conclude that the grindability of dicing blades depends on the abrasive grains size, number and distribution on the surface of the dicing blade.
Dr. Ian Birkby | EurekAlert!
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More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.
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Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.
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The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.
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Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.
Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...
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