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Thermal Stability and Properties of Cu-TiB2 Nanocomposites Prepared by Combustion Synthesis and Spark-Plasma Sintering

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Abstract:

In the present work, Cu-TiB2 nanocomposite powders were synthesized by combining high-energy ball-milling of Cu-Ti-B mixtures and subsequent self-propagating high temperature synthesis (SHS). Cu-40wt.%TiB2 powders were produced by SHS reaction and ball-milled. The milled SHS powder was mixed with Cu powders by ball milling to produce Cu-2.5wt.%TiB2 composites. TiB2 particles less than 250nm were formed in the copper matrix after SHS-reaction. The releative density, electrical conductivity and hardness of specimens sintered at 650-750°C were nearly 98%, 83%IACS and 71HRB, respectively. After heat treatment at 850 to 950°C for 2 hours under Ar atmosphere, hardness was descedned by 15%. Our Cu-TiB2 composite showed good thermal stability at eleveated temperature.

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Periodical:

Materials Science Forum (Volumes 534-536)

Pages:

1517-1520

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.534-536.1517

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Online since:

January 2007

Authors:

Dae Hwan Kwon, Thuy Dang Nguyen, Dina V. Dudina, Jong Won Kum, Pyuck Pa Choi, Ji Soon Kim, Young Soon Kwon

Keywords:

Cu-TiB2 Composites, High-Energy Ball Milling (HEM), Spark Plasma Sintering (SPS)

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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