규화티탄

그림문자(GHS)

• 그림문자(GHS)

  

• 유해·위험 문구

  H228：인화성 고체

  H315：피부에 자극을 일으킴

  H319：눈에 심한 자극을 일으킴

  H335：호흡 자극성을 일으킬 수 있음

• 예방조치문구

  P210：열·스파크·화염·고열로부터 멀리하시오 - 금연 하시오.

  P261：분진·흄·가스·미스트·증기·...·스프레이의 흡입을 피하시오.

  P280：보호장갑/보호의/보안경/안면보호구를 착용하시오.

  P305+P351+P338：눈에 묻으면 몇 분간 물로 조심해서 씻으시오. 가능하면 콘택트렌즈를 제거하시오. 계속 씻으시오.

  P405：밀봉하여 저장하시오.

규화티탄 화학적 특성, 용도, 생산

• 화학적 성질

  orthorhombic black powder(s), a=0.8236 nm, b=0.4773nm, c=0.8523 nm; hardness 4.5 Mohs; resistivity 123μοhm· cm can be prepared by reaction of the elements; used in special alloy applications, as a flame-resistant coating material, also as 99.5 or 99.9% pure material, as a sputtering target in the fabrication of integrated circuits [HAW93] [STR93] [CER91]

• 용도

  Titanium silicide is used in the semiconductor industry. It is also used in the fabrication of transistors.

• Synthesis

  (1) PREPARATION FROM THE ELEMENTS
  Ti + 2 Si = TiSi2
  The silicides are prepared by fusing or sintering intimate stoichiometric mixtures of the elements (in powder form). The reaction is carried out in sintered clay or ceramic crucibles, placed in a Tammann furnace under a blanket of Ar. In all three cases the reaction takes place at a relatively low temperature and is highly exothermic; therefore, one should work with gram quantities only.
  (2) ALUMINOTHERMIC METHOD
  Ignition of a mixture of, for example, 200 g. of Al powder, 250 g. of S, 180 g. of SiOa and 15 g. of TiO2 (or 40 g. of K2TiF6 ), covered with a thin layer of Mg, yields an ingot containing, in addition to Si and Al, small, iron-gray tetragonal pyramids of TiSi2 .
  (3) ELECTROLYTIC PREPARATION
  The pure, crystalline silicides ar e obtained by melt electrolysis of a mixture of, for example, 10K2SiF6 + TiO2 at about 900°C, using an iron cathode; alternately, electrolysis of TiO2 dissolved in a melt of silicate may be used.
  

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