Next Article in Journal
3D ZnO/Ag Surface-Enhanced Raman Scattering on Disposable and Flexible Cardboard Platforms
Previous Article in Journal
The Effect of a Two-Stage Heat-Treatment on the Microstructural and Mechanical Properties of a Maraging Steel
Article Menu
Issue 12 (December) cover image

Export Article

Open AccessArticle
Materials 2017, 10(12), 1348; https://doi.org/10.3390/ma10121348

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.
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)
Full-Text   |   PDF [8077 KB, uploaded 24 November 2017]   |  

Abstract

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
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top