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Abstract

In this study, high-purity tantalum metal powder was manufactured via self-propagating high-temperature synthesis. During the process, Ta2O5 and Mg were used as the raw material powder and the reducing agent, respectively, and given that combustion rate and reaction temperature are important factors that influence the success of this process, these factors were controlled by adding an excessive mass of the reducing agent (Mg) i.e., above the chemical equivalent, rather than by using a separate diluent. It was confirmed that Ta metal powder manufactured after the process was ultimately manufactured 99.98% high purity Ta metal powder with 0.5 µm particle size. Thus, it was observed that adding the reducing reagent in excess favored the manufacture of high-purity Ta powder that can be applied in capacitors.
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Bibliography

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Authors and Affiliations

Yong-Kwan Lee
1 2
ORCID: ORCID
Jae-Jin Sim
1 2
ORCID: ORCID
Jong-Soo Byeon
1 2
ORCID: ORCID
Yong-Tak Lee
1 2
ORCID: ORCID
Yeong-Woo Cho
1 2
ORCID: ORCID
Hyun-Chul Kim
1 3
Sung-Gue Heo
1 3
ORCID: ORCID
Kee-Ahn Lee
2
ORCID: ORCID
Seok-Jun Seo
1
ORCID: ORCID
Kyoung-Tae Park
1
ORCID: ORCID

  1. Korea Institute for Rare Metals, Korea Institute of Industrial Technology, 7-50 Songdo-dong Yeonsoo-gu, Incheon 21999, Korea
  2. Inha University, Department of Advanced Materials Engineering, Incheon 22212, Korea
  3. Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, Republic of Korea
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Abstract

Fe-40wt% TiB2 nanocomposites were fabricated by mechanical activation and spark-plasma sintering of a powder mixture of iron boride (FeB) and titanium hydride (TiH2). The powder mixture of (FeB, TiH2) was prepared by high-energy ball milling in a planetary ball mill at 700 rpm for 3 h followed by spark-plasma sintering (SPS) at various conditions. Analysis of the change in relative sintered density and densification rate during sintering showed that a self-propagating high-temperature synthesis reaction occurs to form TiB2 from FeB and Ti. A sintered body with relative density higher than 98% was obtained after sintering at 1150°C for 5 and 15 min. The microstructural observation of sintered compacts with the use of FE-SEM and TEM revealed that ultrafine particulates with approximately 5 nm were evenly distributed in an Fe-matrix. A hardness value of 83 HRC was obtained, which is equivalent to that of conventional WC-20 Co systems.
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Authors and Affiliations

B.-W. Kim
X.-K. Huynh
J.-S. Kim

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