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Ti Reactive Sintering of Electrically Conductive Al2O3–TiN Composite: Influence of Ti Particle Size and Morphology on Electrical and Mechanical Properties

1
Singapore Institute of Manufacturing Technology, A*STAR, Singapore 637662, Singapore
2
Department of Mechanical Engineering, National University of Singapore, Singapore 117575, Singapore
*
Author to whom correspondence should be addressed.
Materials 2017, 10(12), 1348; https://doi.org/10.3390/ma10121348
Received: 20 October 2017 / Revised: 13 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
(This article belongs to the Section Manufacturing Processes and Systems)
In the current study, Al2O3–TiN composites were successfully fabricated with various particle sizes (10, 20, 30, and 50 μm) and concentrations (5, 10, 15, and 20 vol %) via a novel ball milling + Ti reactive sintering process. By applying the reactive sintering, Ti powders will transform into TiN particles, which act as mechanical reinforcements and electrical conductors in the Al2O3 matrix. The ball milling process alters the Ti powder morphology from a low-aspect-ratio sphere into a high-aspect-ratio disc, which reduces the electrical percolation threshold value from 29% to 15% in the current setup. However, such a threshold value is insensitive to the particle size. Meanwhile, the Ti particle size has a significant influence on the material’s mechanical properties. A small particle size results in less porosity and hence higher flexural strength of the composite. View Full-Text
Keywords: Al2O3–TiN composite; percolation theory; ball-milling; Ti reactive sintering Al2O3–TiN composite; percolation theory; ball-milling; Ti reactive sintering
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Zhai, W.; Song, X.; Li, T.; Yu, B.; Lu, W.; Zeng, K. Ti Reactive Sintering of Electrically Conductive Al2O3–TiN Composite: Influence of Ti Particle Size and Morphology on Electrical and Mechanical Properties. Materials 2017, 10, 1348.

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