# C–Co–W system > C–Co–W system: 70 accepted literature values (invariant reaction 69, activity / EMF / Gibbs energy 1) and 0 calculated phase diagram(s) from ORCHID, each value with evidence class, source, page and quote. HTML: https://data.orchid-project.org/systems/C-CO-W.html · Markdown: https://data.orchid-project.org/systems/C-CO-W.md 70 accepted literature values from 2 paper(s) (experimental 30, model 32, unspecified 8); 0 calculated phase diagram(s). Data: [JSON](https://data.orchid-project.org/literature/systems/C-CO-W.json) · [CSV](https://data.orchid-project.org/systems/C-CO-W.csv) · [interactive explorer](https://orchid-project.org/data-explorer/#C-CO-W) · [papers (bibliography)](https://data.orchid-project.org/bibliography/pages/systems/C-CO-W.html) · [Markdown](https://data.orchid-project.org/systems/C-CO-W.md) Table: Accepted values by evidence class | Evidence class | Values | |---|---:| | experimental | 30 | | model | 32 | | unspecified | 8 | Table: Accepted values by property group | Property group | Values | |---|---:| | invariant reaction | 69 | | activity / EMF / Gibbs energy | 1 | ## Invariant reactions (literature) Table: Invariant reactions reported in the literature for the C–Co–W system (69) | T (K) | Reaction / phases | Compositions (mole fraction) | Class | Source | Location | Quote | |---:|---|---|---|---|---|---| | 2798 | WC + M2C + MC1-x + L | | model | [1] Markström 2005 | Table 2, p. 9, row 35; `ORC-HLDZ6C533T` | | | 2792 | WC + M2C + MC1-x + L | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 34; `ORC-5SYJAJWBVF` | | | 2792 | WC + M2C + MC(1-x) + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 29; `ORC-NODEVD23Y2` | | | 2773 | WC + M2C + MC1-x + L | | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 33; `ORC-5HDAGJOFE2` | | | 2773 | WC + M2C + MC(1-x) + liq. | | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 28; `ORC-CCOXBPFRZ7` | | | 2236 | bcc + M6C + M2C + L | | model | [1] Markström 2005 | Table 2, p. 9, row 30; `ORC-QO4FCFJHMY` | | | 2211 | bcc + M6C + M2C + L | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 29; `ORC-GXHFW2ISMX` | | | 2211 | bcc + M6C + M2C + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 26; `ORC-XZDOHQTMSH` | | | 2142 | WC + M6C + M2C + L | | model | [1] Markström 2005 | Table 2, p. 9, row 32; `ORC-EGSO54WMXL` | | | 2108 | WC + M6C + M2C + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 27; `ORC-GGMOBJAGMK` | | | 2108 | WC + M6C + M2C + L | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 31; `ORC-VAZC2AC2JF` | | | 2005 | bcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005 | Table 2, p. 9, row 28; `ORC-WMSTDXPBKU` | | | 1934 | bcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [2] Guillermet 1989 | Table IV, p. 19, row 25; `ORC-DMF2V5SMSS` | | | 1934 | bcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 27; `ORC-SQCQP6UTZI` | | | 1933 | bcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005 | Table 2, p. 9, row 25; `ORC-4GYNL63RML` | | | 1913 | bcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | unspecified | [2] Guillermet 1989; _cites Gabriel 1984_ | Table IV, p. 19, row 22; `ORC-7AEC2TX7MF` | | | 1911 | bcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 24; `ORC-447RO6HR7U` | | | 1911 | bcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [2] Guillermet 1989 | Table IV, p. 19, row 23; `ORC-VSPTVH2ZSE` | | | 1873 | bcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 24; `ORC-6E6Q4MKS7E` | | | 1873 | bcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 23; `ORC-FPF7MG7GZE` | | | 1873 | bcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 21; `ORC-RBL55OVMFN` | | | 1873 | bcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 26; `ORC-X5QXFSYUAV` | | | 1743 | fcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 18; `ORC-53EAQAVNIV` | | | 1743 | fcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 20; `ORC-ONC56ZUZFS` | | | 1727 | fcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005 | Table 2, p. 9, row 22; `ORC-PSWJEQA47J` | | | 1716 | fcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [2] Guillermet 1989 | Table IV, p. 19, row 20; `ORC-KOMMOI3F4X` | | | 1716 | fcc + μ + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 21; `ORC-V3NQHMQEXA` | | | 1713 | fcc + μ + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | unspecified | [2] Guillermet 1989; _cites Gabriel 1984_ | Table IV, p. 19, row 19; `ORC-CYXCBKHTE3` | | | 1713 | fcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 14; `ORC-JKDS43CGUX` | | | 1713 | fcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 16; `ORC-N2N7KSQ2NJ` | | | 1696 | fcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005 | Table 2, p. 9, row 19; `ORC-FI2YETMQXK` | | | 1688 | fcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | unspecified | [2] Guillermet 1989; _cites L 1982_ | Table IV, p. 19, row 15; `ORC-CLFDFM5AML` | | | 1688 | fcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Akesson 1982_ | Table 2, p. 9, row 17; `ORC-VNNRSSAR4T` | | | 1677 | fcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | unspecified | [2] Guillermet 1989; _cites Gabriel 1984_ | Table IV, p. 19, row 16; `ORC-VUWTDNGNVT` | | | 1667 | fcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [2] Guillermet 1989 | Table IV, p. 19, row 17; `ORC-FFTMU72SIO` | | | 1667 | fcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 18; `ORC-RUI26INX37` | | | 1643 | fcc + M6C + M12C + L | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [1] Markström 2005; _cites Uhrenius 2005_ | Table 2, p. 9, row 15; `ORC-FSGEWIV3JQ` | | | 1643 | fcc + M6C + M12C + liq. | M12C: C 0.076923, Co 0.461538, W 0.461538 | experimental | [2] Guillermet 1989; _cites Uhrenius 1976_ | Table IV, p. 19, row 13; `ORC-Q4UFBHJHJ3` | | | 1641 | fcc + WC + M6C + L | | model | [1] Markström 2005 | Table 2, p. 9, row 14; `ORC-PY243IJPFV` | | | 1641 | fcc + WC + M6C + L | | experimental | [1] Markström 2005; _cites Kruse 2001_ | Table 2, p. 9, row 13; `ORC-ZDMI5J2WAA` | | | 1632 | fcc + WC + M6C + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 7; `ORC-4LZ4OLC3UC` | | | 1632 | fcc + WC + M6C + L | | experimental | [1] Markström 2005; _cites Rautala 1952_ | Table 2, p. 9, row 8; `ORC-7W5MSUVBRQ` | | | 1628 | fcc + WC + M6C + liq. | | unspecified | [2] Guillermet 1989; _cites L 1982_ | Table IV, p. 19, row 10; `ORC-BT2TMOQ3F5` | | | 1628 | fcc + WC + M6C + L | | experimental | [1] Markström 2005; _cites Akesson 1982_ | Table 2, p. 9, row 11; `ORC-F5VVA5AQEZ` | | | 1599 | fcc + WC + M6C + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 12; `ORC-3HGCRV6Z2F` | | | 1599 | fcc + WC + M6C + L | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 12; `ORC-QPGGVUXF5D` | | | 1593 | fcc + WC + M6C + L | | experimental | [1] Markström 2005; _cites Uhrenius 2005_ | Table 2, p. 9, row 9; `ORC-6FOBU3XHFS` | | | 1593 | fcc + WC + M6C + liq. | | experimental | [2] Guillermet 1989; _cites Uhrenius 1976_ | Table IV, p. 19, row 8; `ORC-WAOEBBQNZG` | | | 1577 | fcc + WC + M6C + liq. | | unspecified | [2] Guillermet 1989; _cites Gabriel 1984_ | Table IV, p. 19, row 11; `ORC-FQNZ7MALRM` | | | 1573 | fcc + WC + graph. + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 1; `ORC-AHY2Q3P236` | | | 1573 | fcc + WC + M6C + L | | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 10; `ORC-GHPU7OQTKJ` | | | 1573 | fcc + WC + M6C + liq. | | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 9; `ORC-LGA5KA324F` | | | 1573 | fcc + WC + graph. + L | | experimental | [1] Markström 2005; _cites Rautala 1952_ | Table 2, p. 9, row 1; `ORC-RDFVP6IAXQ` | | | 1571 | fcc + WC + graph. + L | | experimental | [1] Markström 2005; _cites Kruse 2001_ | Table 2, p. 9, row 6; `ORC-5EIYINHQ5I` | | | 1571 | fcc + WC + graph. + L | | model | [1] Markström 2005 | Table 2, p. 9, row 7; `ORC-6KCF6LCLFF` | | | 1549 | fcc + WC + graph. + liq. | | unspecified | [2] Guillermet 1989; _cites Gabriel 1984_ | Table IV, p. 19, row 5; `ORC-6VAY4L33LD` | | | 1548 | fcc + WC + graph. + L | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 5; `ORC-NNOIBVVF2Z` | | | 1548 | fcc + WC + graph. + liq. | | unspecified | [2] Guillermet 1989; _cites L 1982_ | Table IV, p. 19, row 4; `ORC-QDME5QSP3E` | | | 1548 | fcc + WC + graph. + L | | experimental | [1] Markström 2005; _cites Akesson 1982_ | Table 2, p. 9, row 4; `ORC-QJ2Z73CZAR` | | | 1548 | fcc + WC + graph. + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 6; `ORC-SKH2EELTMC` | | | 1546 | fcc + M6C + graph. + L (metastable) | | model | [1] Markström 2005 | Table 2, p. 9, row 38; `ORC-IQSJ47CCSZ` | | | 1528 | fcc + WC + graph. + liq. | | experimental | [2] Guillermet 1989; _cites Uhrenius 1976_ | Table IV, p. 19, row 2; `ORC-44DFGVAVJB` | | | 1528 | fcc + WC + graph. + L | | experimental | [1] Markström 2005; _cites Uhrenius 2005_ | Table 2, p. 9, row 2; `ORC-Z4KUQQAYKI` | | | 1518 | fcc + M6C + graph. + L (metastable) | | experimental | [1] Markström 2005; _cites Uhrenius 2005_ | Table 2, p. 9, row 36; `ORC-AZ74SU52YU` | | | 1518 | fcc + WC + graph. + L | | experimental | [1] Markström 2005; _cites Johansson 1977_ | Table 2, p. 9, row 3; `ORC-DIGHHTN5IX` | | | 1518 | fcc + WC + graph. + liq. | | experimental | [2] Guillermet 1989; _cites Johansson 1977_ | Table IV, p. 19, row 3; `ORC-HZ7JQFWCK6` | | | 1518 | fcc + M6C + graph. + liq. | | experimental | [2] Guillermet 1989; _cites Uhrenius 1976_ | Table IV, p. 19, row 30; `ORC-WUUT4E7FGJ` | | | 1497 | fcc + M6C + graph. + L (metastable) | | model | [1] Markström 2005; _cites Fernandez 1989_ | Table 2, p. 9, row 37; `ORC-2PKTR7TCVD` | | | 1497 | fcc + M6C + graph. + liq. | | model | [2] Guillermet 1989 | Table IV, p. 19, row 31; `ORC-X6QXV4LKQS` | | ## Other properties ### Activity / EMF / Gibbs energy (1) Table: Activity / EMF / Gibbs energy, C–Co–W system | Property | Value | T (K) | Phases / composition | Class | Source | Location | Quote | |---|---:|---:|---|---|---|---|---| | Activity; _printed: a(C)_ | 0.2 unspecified | 1423 | fcc + M12C + M6C + WC | experimental | [1] Markström 2005; _cites Johansson 1977_ | p. 5; `ORC-PYKNYH6DTD` | “At a carbon activity near 0.2, Johansson (Ref 11) found a four-phase equilibrium between fcc, M12C, M6C, and WC at 1423 K.” | ## Sources Reporting papers the values were read from (a value cited from another work names that work in its row). 1. Andreas Markström, Bo Sundman, Karin Frisk, A Revised Thermodynamic Description of the Co-W-C System, Journal of Phase Equilibria & Diffusion 26, 152-160 (2005). [doi:10.1361/15477030522473](https://doi.org/10.1361/15477030522473) 2. Armando Fernández Guillermet, Thermodynamic properties of the Co-W-C system, Metall Trans A 20, 935-956 (1989). [doi:10.1007/bf02651660](https://doi.org/10.1007/bf02651660) ## Please cite - R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735569 - R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065 Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0). Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes. ```bibtex @misc{orchid_literature_2026, author = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon}, title = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}}, version = {2026.10}, publisher = {Zenodo}, year = {2026}, doi = {10.5281/zenodo.23735569}, url = {https://doi.org/10.5281/zenodo.23735569}, note = {Version 1, machine-extracted} } @misc{orchid_data_2026, author = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon}, title = {{ORCHID data: umbrella record of the ORCHID datasets}}, version = {2026.10}, publisher = {Zenodo}, year = {2026}, doi = {10.5281/zenodo.23736065}, url = {https://doi.org/10.5281/zenodo.23736065}, note = {Version 1, machine-extracted} } ``` --- Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite ORCHID ([CITATION.cff](https://data.orchid-project.org/CITATION.cff)) and the original sources. Quotes are short excerpts kept so that each value can be checked; they remain under the publishers' copyright and are not relicensed. Source papers, page images and full text are not redistributed. Field reference: [SCHEMA.md](https://data.orchid-project.org/literature/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt). Found an error? The report link of a value (Markdown: its id, ORC-..., in the Location column) opens a pre-filled GitHub issue, https://github.com/orchid-calphad/orchid-data/issues/new?template=report-value-error.yml&record_id=\, carrying only the record id, source and value; [how to contribute](https://orchid-project.org/contribute/).