• Title/Summary/Keyword: Ti powder

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Synthesis of (Ti,Al)N Powder by the Direct Nitridation(II) (직접질화법에 의한 (Ti,Al)N계 복합질화물의 합성(II))

  • Cho, Young-Soo;Lee, Young-Ki;Sohn, Yong-Un;Park, Kyong-Ho;Kim, Seok-Yoon
    • Journal of the Korean Society for Heat Treatment
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    • v.9 no.3
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    • pp.219-227
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    • 1996

  • The purpose of this research is to develop the technology for the synthesis of (Ti,Al)N powder, which shows simultaneously the excellent properties of TiN and AlN, from the Ti-Al intermetallic compounds by the direct nitriding method. The effects of variables such as temperature, Ti-Al intermetallic compounds ($TiAl_3$, TiAl and $Ti_3Al$) were investigated by TG, XRD and SEM. The (Ti,Al)N powder can be easily synthesized from the intermetallic compounds by the direct nitriding method. Among the intermetallic compounds, the nitriding behavior increased with TiAl> $Ti_3Al$ > $TiAl_3$, as the difference of diffusion coefficient for nitrogen in each materials. The ternary nitride such as $Ti_2AlN$ and $Ti_3Al_2N_2$ can be synthesized by the direct nitriding method, although the ternary nitride coexist with TiN and AlN. The ternary nitrides are stable below $1400^{\circ}C$, but these are gradually decomposed into TiN and AlN above $1400^{\circ}C$.

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Synthesis and Process Development of Ultrafine Ti Powder by Sodium Flame Encapsulation Method (Sodium Flame Encapsulation 방법에 의한 초미립 Ti 분말 합성 및 공정개발)

  • Maeng, Deok-Yeong;Lee, Chang-Gyu;Kim, Heung-Hui
    • Korean Journal of Materials Research
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    • v.12 no.5
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    • pp.391-397
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    • 2002

  • Synthesis and process development of nano-size Ti powder by SFE(Sodium/halide Flame Encapsulation) method were investigated. Four concentric coflow burner was used and its flame configuration was $TiCl_4/Ar/Na/Ar$ in order from the center. Flame has been controlled by the various processing parameters such as temperature of burner and flow rates of both $TiCl_4$(g) precursor and Na(g). It was found that yellow-colored flame was shown in the flow rates of 70cc/min of $TiCl_4$(g) precursor and 2 $\ell$ /min of Na(g) which were regarded as optimum flame condition. The powders encapsuled by NaCl were produced having the average powder size of 250nm. The results of X-ray diffraction showed that powders from the optimized condition consisted of pure Ti and NaCl. TEM analysis confirmed that the several Ti powders of 20-100nm were encapsulated with NaCl. After removing sodium chloride by heat treatment, the spherical Ti powders with the size range of 80 to 150nm were obtained.

  • https://doi.org/10.3740/MRSK.2002.12.5.391 인용 PDF KSCI

Effect of Loose Compact Size of (Ti+Ni) Elemental Powder Mixture on the Behavior of Combustion Wave Propagation during Self-propagating High-temperature Synthesis and Mechanical Properties of Porous TiNi Body ((Ti+Ni) 혼합분말 성형체 크기가 TiNi 다공체 고온자전합성 과정의 연소파 진행 거동과 기계적 특성에 미치는 영향)

  • Kim, Ji-Sun;Song, Jun-Ho;Gwon, Yeong-Sun;Gang, Ji-Hun;Yang, Seok-Gyun
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2004.04a
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    • pp.21-21
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    • 2004

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