ホウ化ジルコニウム（２：１）

危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Warning

• 危険有害性情報

  H228：可燃性固体

• 注意書き

  P210：熱/火花/裸火/高温のもののような着火源から遠ざ けること。－禁煙。

  P240：容器を接地すること/アースをとること。

  P241：防爆型の電気機器/換気装置/照明機器/．．．機器を使 用すること。

  P280：保護手袋/保護衣/保護眼鏡/保護面を着用するこ と。

ホウ化ジルコニウム（２：１） 価格

ホウ化ジルコニウム（２：１） 化学特性,用途語,生産方法

• 外観

  黒灰色の粉末

• 溶解性

  無機酸、水及びエタノールにほとんど溶けない。

• 使用上の注意

  ほう化物の粉末は、経時変化が大きく、特に大気中の湿気に酸化されて含有酸素や水分が増加する。

• 説明

  Zirconium diboride (ZrB2) is a highly covalent refractory ceramic material with a hexagonal crystal structure. ZrB2 is known as a UHTC with a melting point of 3246
  C. This together with its relatively low density of B6.09 g/cm3 (measured density may be higher due to hafnium impurities) and good high-temperature strength makes it a contender for high-temperature aerospace applications, for example, hypersonic flight or rocket propulsion systems. It is an unusual ceramic with relatively high thermal and electrical conductivities.

• 化学的特性

  Zirconium boride, also known as zirconium diboride, a gray metallic crystals or powders. Mohs hardness 8, electrical resistivity 9.2 micro-ohm-cm (20°C), excellent thermal shock resistance, poor oxidation resistance above 1100°C. It was attacked very little by cold HCl, more rapidly by HNO3, and is dissolved by aqua regia. It reacts with H2SO4 and is readily attacked by fused alkali hydroxides, carbonates, and disulfides.
  
  Zirconium diboride (ZrB2) is a transition metal boride with a hexagonal crystal structure and P6/mmm symmetry. ZrB2 has a combination of metallic, ionic, and covalent bonds. Due to its strong covalent bonds, ZrB2 has a high melting temperature of 3250°C. This melting temperature classifies ZrB2 as an ultra-high temperature ceramic (UHTC). UHTCs have been proposed for use in many different applications due to their high melting temperatures (>3000°C), as well as their high strength and chemical inertness.

• 物理的性質

  Gray metallic crystals, excellent thermal shock resistance, greatest oxidation inertness of all refractory hardmetals. Hot-pressed crucible for handling molten metals such as Zn, Mg, Fe, Cu, Zn, Cd, Sn, Pb, Rb, Bi, Cr, brass, carbon steel, cast irons, and molten cryolithe, yttria, zirconia, and alumina. Readily corroded by liquid metals such as Si, Cr, Mn, Co, Ni, Nb, Mo, Ta and attacked by molten salts such as Na O, 2 alkali carbonates, and NaOH. Severe oxidation in air occurs above 1100–1400°C. Stable above 2000°C in inert or reducing atmosphere.

• 使用

  Zirconium boride is use to improve resistance in zirconia-based, carbon-bonded refractories in contact with ferrous melts. Used in nuclear applications, aerospace refractory, in cutting tools and to protect thermocouple tubes. It also used in use of its relatively high conductivity, especially for a ceramic.

• 主な応用

  Zirconium diboride (ZrB2) is an ultra high termparature ceramic powder. With good high temperature strength, it is used in the aerospace industry for hypersonic flight or rocket propulsion. ZrB2 is a kind of senior engineering material broadly used in various fields. Refractory for aircraft and rocket applications, thermocouple protection tubes, high temperature electrical conductor, cutting tool component, coating tantalum, cathode in high-temperature electrochemical systems.

• 工業用途

  Zirconium boride is a microcrystalline graypowder of the composition ZrB2. When compressedand sintered to a specific gravity ofabout 5.3, it has a Rockwell A hardness of 90,a melting point of 2980°C, and a tensilestrength of 241 to 276 MPa. It is resistant tonitric and hydrochloric acids, to molten aluminumand silicon, and to oxidation. At 1204°Cit has a transverse rupture strength of 379 MPa.It is used for crucibles and for rocket nozzles.

• 合成

  Zirconium boride powder is mainly prepared by carbothermic reduction of ZrO2 powder and carbon black or graphite powder. The reaction equation is:
  3ZrO2+B4C+8C+B2O3=3ZrB2+9CO↑
  Zirconium boride obtained from zirconia and boron oxide by magnesiothermic MASHS.

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