Observation of internal pulsed current flow through the ZnO specimen in the spark plasma sintering method
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In spark plasma sintering (SPS), it is supposed that a part of the large pulsed sintering current flows into the specimen and affects the sintering behavior. To clarify the influence of the internal pulsed current that flows through the specimen during SPS, measurement of the electrical resistance of the specimen was conducted using Pt electrodes and the internal pulsed current was successfully observed using a magnetic probe during the sintering of ZnO and other materials. Two Pt electrodes were installed on the sides of a ZnO sample through a carbon die, and decrease of electrical resistance was observed with the progress of sintering. The internal current that flows through the specimen during SPS was several hundred ampere, and the ratio of the internal current to the total current was found to be dependent on the material and the progress of SPS process.
KeywordsSpark Plasma Sinter Probe Position Sinter Behavior Magnetic Probe Sinter Specimen
The authors would like to thank Dr. K. Ozaki, Materials Research Institute for Sustainable Development, National Institute of Advanced Industrial Science and Technology (AIST), and Dr. Y. Makino, Joining and Welding Research Institute, Osaka University, for helpful discussion. The thorough and helpful comments of reviewers on this article are gratefully acknowledged. This research was partially supported by a Grant-in-Aid for Scientific Research (19740345, 2007) from the Ministry of Education, Science, Sports, and Culture of Japan.
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