To date, machines carrying out electroerosion-based machining processes have only had use of automated parameters for metallic materials such as steel. In his thesis, Navarre Public University researcher and lecturer, Iñaki Puertas, presents technologies for those applications using ceramic material, a highly interesting development from a technological viewpoint as it enables the use of ceramics in the fabrication of parts requiring great hardness and durability such as medical prothesis or those designed for use in the aerospace sector.
The technical ceramic materials have a wide range of applications, in situations in which the following are required: resistance to wear or corrosion, high mechanical resistance together with resistance to high temperatures. Despite its exceptional mechanical, chemical and thermal properties, however, technical ceramic materials have not been wholly accepted in industrial applications, mainly due to the difficulties encountered during their manufacture, apart from the high costs associated with the process.
The technological tables, drawn up for the three conducting ceramic materials analysed in the research (hot-pressed boron carbide, silicon-infiltrated silicon carbide and tungsten carbide in cobalt metallic matrix) will enable the choice of suitable operating conditions in the electroerosion process in order to obtain a determined value of surface roughness of the parts. And this in function of two distinct machining strategies: one which maximises the rate of elimination of material and the other which minimises the wear of the electrode. The main types of conducting ceramic materials for industrial application are thus coated.
Iñaki Casado Redin | Basque research
New biomaterial could replace plastic laminates, greatly reduce pollution
21.09.2017 | Penn State
Stopping problem ice -- by cracking it
21.09.2017 | Norwegian University of Science and Technology
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
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!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
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...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy
22.09.2017 | Physics and Astronomy