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
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The building blocks of matter in our universe were formed in the first 10 microseconds of its existence, according to the currently accepted scientific picture. After the Big Bang about 13.7 billion years ago, matter consisted mainly of quarks and gluons, two types of elementary particles whose interactions are governed by quantum chromodynamics (QCD), the theory of strong interaction. In the early universe, these particles moved (nearly) freely in a quark-gluon plasma.
This is a joint press release of University Muenster and Heidelberg as well as the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt.
Then, in a phase transition, they combined and formed hadrons, among them the building blocks of atomic nuclei, protons and neutrons. In the current issue of...
Thin-film solar cells made of crystalline silicon are inexpensive and achieve efficiencies of a good 14 percent. However, they could do even better if their shiny surfaces reflected less light. A team led by Prof. Christiane Becker from the Helmholtz-Zentrum Berlin (HZB) has now patented a sophisticated new solution to this problem.
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A study in the journal Bulletin of Marine Science describes a new, blood-red species of octocoral found in Panama. The species in the genus Thesea was discovered in the threatened low-light reef environment on Hannibal Bank, 60 kilometers off mainland Pacific Panama, by researchers at the Smithsonian Tropical Research Institute in Panama (STRI) and the Centro de Investigación en Ciencias del Mar y Limnología (CIMAR) at the University of Costa Rica.
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