Current Distribution Model and Control Principle of MgAlON Composites by Spark Plasma Sintering (SPS)

Abstract:

The current distribution had remarkable effect on the microstructure and properties of MgAlON composites in the process of spark plasma sintering (SPS). MgAlON composites, using alumina, magnesia and aluminum as starting materials, were prepared by SPS. Based on the current distribution method, the current distribution model on samples and single grain was established, and the basic electric current control principle was analyzed. It was found that the current conveyance by sample or single Al grain could be expressed by a formula including B and I.In the formula, B was the Al volume fraction and I was the total current. When the Al volume fraction was controlled within 12%, the current conveyance by sample increased significantly with the Al addition increasing. Meanwhile, the current conveyance by single Al grain decreased significantly. The sintering speed and properties of MgAlON composites by SPS would show a significantly change.

• Periodical: Advanced Materials Research (Volume 833)
• Pages: 111-114
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.833.111
• Online since: November 2013
• Authors: Xiao Cong Feng, Dao Yuan Yang, Yuan Chao Qu, Ting Wang, Cun Bao Zhang
• Keywords: Current Distribution Model, MgAlON Composites, Process Control Principle, Spark Plasma Sintering (SPS)

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DOI: 10.1111/j.1551-2916.2005.00777.x