Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Producing high performace porous materials by Pulsed Electric Current Sintering

22.05.2006


Homogeneity in sintering of fine Ni-20Cr powder by PECS process



Pulsed Electric Current Sintering (PECS), also known as spark plasma sintering (SPS) or plasma activation sintering (PAS) is technique used for densifying power compacts or materials such as metals and ceramics and combination thereof. The attractive features of the process are that it allows compaction and sintering in a single stage and the process itself is quite rapid.

PECS also shows promise in being able to produce high performance porous materials. The difficulty in producing such porous materials is the ability to produce a homogenous microstructure.


In this paper, Japanese researchers, Manabu Sato, Makoto Nanko, Koji Matsumaru and Kozo Ishizaki, from the Nagaoka University of Technology examine density homogeneity in partially–sintered metallic bodies produced using PECS. In order to obtain homogeneous microstructure the effects of geometry of the graphite die is also investigated. Fine Ni-20Cr powder with particle size of 5 µm and coarse powder with 70 µm in particle size were used in order to discuss effects of powder size.

The researchers successfully produced porous bodies using the PECS technology. They found that sintering rates were faster for finer starting powders when compared to coarser powders, with differing dies sizes and geometries making no significant difference. Coarser powders, despite their slower rates of densification produced homogenous microstructures. Finer powders in contrast, were found to be significantly denser on the inside compared to the outside. This was attributed to temperature gradients from Joule heating and heat transfer during the sintering process. The use of die with thicker walls was found to resolve this issue and at the same time improved reproducibility.

Dr. Ian Birkby | EurekAlert!
Further information:
http://www.azonetwork.com
http://www.azom.com/Journal%20Editorial%20Board.asp

More articles from Materials Sciences:

nachricht Decoding cement's shape promises greener concrete
08.12.2016 | Rice University

nachricht Scientists track chemical and structural evolution of catalytic nanoparticles in 3-D
08.12.2016 | DOE/Brookhaven National Laboratory

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Electron highway inside crystal

Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.

Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...

Im Focus: Significantly more productivity in USP lasers

In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.

Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...

Im Focus: Shape matters when light meets atom

Mapping the interaction of a single atom with a single photon may inform design of quantum devices

Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...

Im Focus: Novel silicon etching technique crafts 3-D gradient refractive index micro-optics

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.

Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...

Im Focus: Quantum Particles Form Droplets

In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.

“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

ICTM Conference 2017: Production technology for turbomachine manufacturing of the future

16.11.2016 | Event News

Innovation Day Laser Technology – Laser Additive Manufacturing

01.11.2016 | Event News

#IC2S2: When Social Science meets Computer Science - GESIS will host the IC2S2 conference 2017

14.10.2016 | Event News

 
Latest News

Researchers identify potentially druggable mutant p53 proteins that promote cancer growth

09.12.2016 | Life Sciences

Scientists produce a new roadmap for guiding development & conservation in the Amazon

09.12.2016 | Ecology, The Environment and Conservation

Satellites, airport visibility readings shed light on troops' exposure to air pollution

09.12.2016 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>