Characteristics of Titanium Carbide Fabricated by Fine Titanium Hydride Powder

Kyoung, Sung Tek; In-Shup, Ahn; Bae, S. W.; Hyun, Jeong Woo; Park, Dong-Kyu; Chul, Jung Kwang; Kim, You-Young

doi:10.4150/kpmi.2005.12.3.174

Cited by 1 publication

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“…The advantages of this method are the reduced fabrication costs and easy formation of fine particles caused by the brittle TiH 2 phase [8][9][10]. In case of using TiH 2 and carbon powders, it is possible to synthesize TiC without residual titanium oxide phase because TiH 2 formation free energy is a lower value of -217.823 kJ/mol [11] at 1,400 K, in contrast to TiO 2 reduction free energy of -167.787 kJ/mol [12] and direct TiC synthesis energy of 47.809 kJ/mol [7].…”

Section: Introductionmentioning

confidence: 99%

The Ni3Al–Al2O3/TiC cermet formation behavior with TiH2 base ball-milled powders with Ni, Al, and C during spark plasma sintering

Kim

Choi

et al. 2010

Res Chem Intermed

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The development of new binder matrices and a fine hard phase have been studied in order to improve the properties of cermet material because TiC has a low stiffness and toughness at high temperature in spite of its high melting point, high hardness, oxidation and corrosion resistance, good thermal stability, and thermal shock resistance. Ni 3 Al intermetallics are great candidate binder matrices for some structural applications, especially those at the high temperature instead of Co or Ni. This permanently ordered compound up to its melting point has attracted wide interest since it is the prototype of one constituent phase of Ni-base superalloys strengthened by c'phase precipitation. This research focused on the fabrication of Ni 3 Al-Al 2 O 3 /TiC composite materials by spark plasma sintering. Raw powders of Ni, Al, TiH 2 and activated carbon were milled in a planetary mill to fabricate Ni 3 Al-Al 2 O 3 /TiC cermet. These mixtured powders were consolidated by spark plasma sintering up to 1,350°C in vacuum atmosphere under 10 -3 Torr. Ni 3 AlAl 2 O 3 /TiC composite was directly synthesized by dehydrogenation and carburization reaction during sintering process. In situ sintered Ni 3 Al-Al 2 O 3 /TiC composite materials were formed by spark plasma sintering above 1,100°C with 10-h milled powders. In the case of spark plasma sintering for 5 min at 1,350°C, it indicated a hardness value of 71 HRC and a relative density of 94.6% through the influence of rapid densification and fine TiC particle reinforced Ni 3 Al-base composites materials.

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