Tungsten carbidedensity

10. Both molten nickel and cobalt readily wet tungsten carbide. The phase diagram of the W-C-Co system reveals that WC and Co have a pseudo-binary eutectic.

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Tungsten carbidestructure

9. The low electrical resistivity of tungsten carbide (about 0.2 m) is equivalent to that of other metals (e.g. vanadium 0.2 m).

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Tungsten carbidehardness

1. There are two well-known tungsten and carbon compounds: WC and tungsten semicarbazide, W2C. Coatings may contain both substances, with the proportions varying depending on the coating process.

12. In the presence of a molten phase, such as cobalt, abnormal grain growth has been observed in the sintering of tungsten carbide, with significant implications for the product material's efficiency.

7. It has a Poisson's ratio of 0.31 and has an ultimate tensile strength of 344 MPa and an ultimate compressive strength of around 2.7 GPa.

Tungsten carbideproperties

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Tungsten carbidechemical formula

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6. Young's modulus is around 530–700 GPa, the bulk modulus is around 630–655 GPa, and the shear modulus is around 274 GPa.

2. By heating the WC phase to high temperatures with plasma and then quenching in inert gas, another meta-stable tungsten and carbon compound can be produced (plasma spheroidization).

3. The non-stoichiometric high-temperature phase WC1-x exists in a meta-stable form at room temperature as a result of this process, which causes macrocrystalline WC particles to a spheroid. As compared to other tungsten carbide compounds, this phase's fine microstructure offers high hardness (2800-3500 HV) and strong toughness. Because of this compound's meta-stability, it has lower high-temperature stability.

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Tungsten carbideuses

5. At 500–600 °C (932–1,112 °F), WC begins to oxidize. It is acid-tolerant and is only targeted at room temperature by hydrofluoric acid/nitric acid (HF/HNO3) mixtures. It is unreactive to dry H2 up to its melting point and reacts with fluorine gas at room temperature and chlorine above 400 °C or 752 °F. In aqueous hydrogen peroxide solutions, finely powdered WC is readily oxidized. It reacts with aqueous sodium carbonate at high temperatures and pressures to form sodium tungstate, which is used to recover scrap cemented carbide due to its selectivity.

Tungsten carbideprice

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Tungsten carbidecomposition

11. Controlling the carbon content in WC-Co cemented carbides is critical due to the potential for carbides to form and the brittleness of these phases.

4. At high temperatures, WC decomposes into tungsten and carbon, which can happen during high-temperature thermal sprays, such as in HVOF and HEP methods.