Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Parts containing ceramic material

03.06.2003


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.


Electroerosion applied to ceramics

Machining by electroerosion is a non-conventional manufacturing process based on the elimination of material of a part by means of a repeated series of electrical discharges taking place between a tool – known as the electrode – and the part or work piece; all this in the presence of a dielectric fluid or oil. This fluid enables the evacuation of eroded particles from the space between the electrode – and the part. The main disadvantage is that it can only be applied in those cases where the materials are sufficiently conducting. This is why, traditionally, it has been basically applied to metallic materials such as steel. In this research, the process of electroerosion is studied for the three technical ceramic materials which, given their greater conductivity compared with other ceramic materials, are known as ceramic conductors.

These ceramic materials have superior properties to other materials: hardness, resistance to wear, resistance to corrosion and resistance to high temperature.

Obtaining of technological tables

All this has enabled the drawing up technological tables whereby the user, non-expert in the field of electroerosion, can employ a series of recommended values in their machine-tool programming. This is of great interest from a technological point of view, although these tables already existed for metallic materials such as steel, but quite scant – to date - in the case of ceramic conductors.

Contacts
Iñaki Casado Redin
Nafarroako Unibertsitate Publikoa
inaki.casado@unavarra.es
(+34) 948 16 97 82

gabinete.prensa@unavarra.es

Iñaki Casado Redin | Basque research
Further information:
http://www.unavarra.es

More articles from Materials Sciences:

nachricht Getting closer to porous, light-responsive materials
26.07.2017 | Kyoto University

nachricht Multitasking monolayers
25.07.2017 | Vanderbilt University

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Carbon Nanotubes Turn Electrical Current into Light-emitting Quasi-particles

Strong light-matter coupling in these semiconducting tubes may hold the key to electrically pumped lasers

Light-matter quasi-particles can be generated electrically in semiconducting carbon nanotubes. Material scientists and physicists from Heidelberg University...

Im Focus: Flexible proximity sensor creates smart surfaces

Fraunhofer IPA has developed a proximity sensor made from silicone and carbon nanotubes (CNT) which detects objects and determines their position. The materials and printing process used mean that the sensor is extremely flexible, economical and can be used for large surfaces. Industry and research partners can use and further develop this innovation straight away.

At first glance, the proximity sensor appears to be nothing special: a thin, elastic layer of silicone onto which black square surfaces are printed, but these...

Im Focus: 3-D scanning with water

3-D shape acquisition using water displacement as the shape sensor for the reconstruction of complex objects

A global team of computer scientists and engineers have developed an innovative technique that more completely reconstructs challenging 3D objects. An ancient...

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

Closing the Sustainability Circle: Protection of Food with Biobased Materials

21.07.2017 | Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

 
Latest News

CCNY physicists master unexplored electron property

26.07.2017 | Physics and Astronomy

Molecular microscopy illuminates molecular motor motion

26.07.2017 | Life Sciences

Large-Mouthed Fish Was Top Predator After Mass Extinction

26.07.2017 | Earth Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>