SPS as a tool of new materials

2^nd International Conference and Exhibition on Materials Science & Engineering

October 07-09, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Kazuyuki Kakegawa

Accepted Abstracts: J Material Sci

Abstract :

SPS is a sintering method similar to hot pressing. Powdered samples are heated with uniaxial pressure. The difference is that SPS uses pulse direct current. SPS sinters many materials much faster than hot pressing. In the early days, researchers believed that spark plasma caused by the pulse direct current enhanced the sintering behavior. This is the origin of the name of SPS: Spark plasma sintering. Recently, many people do not believe the existence of spark plasma and call this method in different ways. Some people use the term, ?SPS? instead of ?spark plasma sintering?. Other people use ?PECS?, an abbreviation of ?pulse electric current sintering?. Anyhow the ability of SPS is very high. Because SPS sinters many materials at lower temperatures and within shorter periods, initial particle size can be maintained. This is a great advantage for sintering nanomaterials. SPS can also fabricate a material having its initial compositional distribution. This enables a combination of properties of different compositions. Examples of these results will be shown. There are many materials which need high temperature for densification even by SPS. Although increase in the pressure of SPS is effective to lower such temperature, high pressure is not available for ceramic materials. Graphite die is used for sintering ceramics, because of the range of the sintering temperature of them. Graphite die is too weak for the high pressures. Methods to enable high pressure SPS were developed by researchers including us. Such methods will be shown in this presentation.

Biography :

Kazuyuki Kakegawa is a Professor of Chiba University. He was graduated from Chiba University. He got doctorate from Tokyo Institute of Technology. He is now a Director of The Society of Inorganic Materials, Japan, chair of its academic committee and a member of its editorial boards. He is also a member of publishing committee, a secretary of Kanto branch and electronic division of The Ceramic Society of Japan. He is on editorial board of some international journals.