HAFNIUM BORIDE
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HAFNIUM BORIDE ??
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- 3250°C
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- 10.5
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- Specific Gravity
- 10.5
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- gray hexagonal, hexane crystals, crystalline
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- Crystal Structure
- Hexagonal
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- ACGIH: TWA 0.5 mg/m3
NIOSH: IDLH 50 mg/m3; TWA 0.5 mg/m3
- InChIKey
- VFOMGQXFCYKNAF-UHFFFAOYSA-N
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HAFNIUM BORIDE C??? ??, ??, ??
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gray, hexagonal, crystal(s) solid, a=0.3141 nm, c=0.3470nm; can be prepared by heating HfO2+C+B2O3; hardness 2900 kgf/mm2; resistivity 8.8μohm· cm; used as a refractory material and as a sputtering target with 99.5% purity to produce films, which may be wear-resistant and semiconducting [HAW93] [KIR80] [CER91]??
Hafnium boride is used in wear resistant coatings. It is also employed as a nuclear reactor control rod. Furthermore, it is used in hypervelocity re-entry vehicles like ICBM heat shields or aerodynamic leading-edges. It is useful in the preparation of high temperature composites in conjunction with silicon carbide (SiC).HAFNIUM BORIDE ?? ?? ? ???
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HAFNIUM BORIDE ?? ??
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