![]() Why is the melting point of cobalt so high?Ĭobalt has 9 free valence electrons per atom giving a sea of delocalized electrons that are held together by strong metallic force that is hard to break at low temperature. Manufacturing of high speed steel and cemented carbides, cobalt is extensively used.Cobalt is occasionally employed in electroplating.Cobalt can be easily magnetized, hence they are used to make magnets.Cobalt and its alloys are used in jet turbines and gas turbines to withstand high temperatures.Cobalt exhibits two covalent radius, low spin of cobalt has 126☓pm and high spin of cobalt has 150☗pm, indicating strong intermolecular interaction.Īpplications of high melting point of cobalt.The bond length between two nearest cobalt atoms in the lattice is 2.66Å and its atomic radius is 1.25Å, indicating smaller atomic size.The molecular weight of cobalt is 58.933195u, indicating closely packed molecular arrangement. Cobalt has a density of 8.90g/cm 3 near room temperature and 8.86g/cm 3 near its melting point temperature. ![]() Properties influencing the melting point of cobalt Methylidyne Tricobalt Nonacarbonyl (HCCo 3(CO) 9) Tris(ethylenediamine)cobalt(III) chloride (C 6H 24N 6Cl 3Co)Ĭobalt tricarbonyl nitrosyl (C 3CoNO 4 –)Ĭyclopentadienylcobalt dicarbonyl (C 7H 5CoO 2) Tris(acetylacetonato)cobalt(III) (Co(C 5H 7O 2) 3) Tetracobalt dodecacarbonyl (C 12Co 4O 12) Sodium hexanitritocobaltate(III) (CoN 6Na 3O 12) Hexamminecobalt(III) chloride (H 18Cl 3CoN 6) Trans-Dichloro bis(ethylenediamine) cobalt(III) Chloride (C 4H 16Cl 3CoN 4) Tris(ethylenediamine)cobalt(III) Chloride Dihydrate (C 6H 28N 6Cl 3CoO 2) Melting point of cobalt compounds CompoundsĬhloro(pyridine) bis(dimethylglyoximato) cobalt(III) (C 13H 19ClCoN 5O 4) Typical applications include ethylene pyrolysis, hydrocarbon cracking, cracking furnaces for vinyl chloride, diphenol and acetic acid. ![]() 800HT can be welded by the common techniques used on stainless steels. When cold formed extensively the grain size produces a visibly undulated surface called “orange peel”. Excellent cold forming characteristics typically associated with the nickel-chromium alloys are exhibited with 800HT. 800HT will not become embrittled even after long periods of usage in the 1200-1600 deg F range where many stainless steels become brittle. It has excellent resistance to carburization, oxidation and nitriding atmospheres. The alloy is usually dual certified and combines the properties of both forms. Incoloy 800 H has further modifications to the combined titanium and aluminum levels (0.85 to 1.2%) to ensure optimum high temperature properties. The 800H modification was to control carbon (0.05 to 0.10%) and grain size to (>ASTM 5) to optimize stress rupture properties. The higher strength results from close control of carbon, aluminum and titanium contents in conjunction with a high temp anneal. A nickel-chromium -iron alloy having similar basic composition as Incoloy 800, with significantly higher creep rupture strength. ![]()
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