[en] Cobalt and tungsten have been listed since 2008 as “critical raw materials” by the European Commission. Recycling used cemented carbide tools is a solution to reduce the criticality of those materials. However, recycled tungsten carbide powder, made from the Coldstream process, shows low sinterability properties at conventional sintering temperatures. To enhance mechanical properties, boron-doped cobalt powder is added during the ball milling step. Due to the formation of a eutectic between boron and cobalt, the sinterability of the powders is greatly improved, and the sintering temperature could be decreased by 100 °C compared to conventional processes.
The as-received recycled powder contains 7.5 wt% cobalt. That powder has been milled with the addition of boron-doped cobalt powder. Three powders have thus been prepared: WC-7.5(Co-B), WC-10(Co-B), and WC-15(Co-B). The sintered parts have been characterized in terms of physical, and mechanical properties, and grain size distributions. The boron-doped parts showed superior mechanical properties for a lower sintering temperature than boron-free samples.
Disciplines :
Materials science & engineering
Author, co-author :
Mégret, Alexandre ; Université de Mons - UMONS > Faculté Polytechnique > Service de Métallurgie
Vitry, Véronique ; Université de Mons - UMONS > Faculté Polytechnique > Service de Métallurgie
Delaunois, Fabienne ; Université de Mons - UMONS > Faculté Polytechnique > Service de Métallurgie
Language :
English
Title :
The effect of boron-doped cobalt additions on mechanical properties of a recycled WC-Co powder
Publication date :
February 2023
Journal title :
International Journal of Refractory Metals and Hard Materials
ISSN :
0263-4368
Publisher :
Elsevier, United Kingdom
Volume :
111
Pages :
106098
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
F601 - Métallurgie
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
European Commission, Tacking the Challenges in Commodity Markets and on Raw Materials. 2011.
European Commission, Study on the EU's List of Critical Raw Materials (2020) - Final Report. 2020, 10.2873/904613.
Lassner, E., Schubert, W.D., Tungsten: Properties, Chemistry. 1999, New York, Technology of the Element, Alloys, and Chemical Compounds.
Bhosale, S.N., Mookherjee, S., Pardeshi, R.M., Current practices in tungsten extraction and recovery. High Temp. Mater. Process. 9 (1990), 147–162.
Kuntyi, O.I., Ivashkin, V.R., Yavorskii, V.T., Zozulya, G.I., Electrochemical processing of WC-Ni Pseudoalloys in sulfuric acid solutions to ammonium Paratungstate and nickel (II) sulfate. Russ. J. Appl. Chem. 80 (2007), 1856–1859, 10.1134/S1070427207110158.
Katiyar, P.K., Randhawa, N.S., A comprehensive review on recycling methods for cemented tungsten carbide scraps highlighting the electrochemical techniques. Int. J. Refract. Met. Hard Mater., 90, 2020, 105251, 10.1016/j.ijrmhm.2020.105251.
Shemi, A., Magumise, A., Ndlovu, S., Sacks, N., Recycling of tungsten carbide scrap metal: a review of recycling methods and future prospects. Miner. Eng. 122 (2018), 195–205, 10.1016/j.mineng.2018.03.036.
Latha, T.M., Venkatachalam, S., Electrolytic recovery of tungsten and cobalt from tungsten carbide scrap. Hydrometallurgy. 22 (1989), 353–361.
Freemantle, C.S., Sacks, N., Recycling of cemented tungsten carbide mining tool scrap. J. South. Afr. Inst. Min. Metall. 115 (2015), 1207–1213, 10.17159/2411-9717/2015/v115n12a9.
Takahashi, R., Yuize, T., Method of Chemically Disintegrating and Pulverizing Solid Material. 1958.
Jonsson, K.A., Process for Chlorination of Material Containing Hard Metal, US3560199A. 1971.
Edtmaier, C., Schiesser, R., Meissl, C., Schubert, W.D., Bock, A., Schoen, A., Zeiler, B., Selective removal of the cobalt binder in WC/co based hardmetal scraps by acetic acid leaching. Hydrometallurgy. 76 (2005), 63–71, 10.1016/j.hydromet.2004.09.002.
Gürmen, S., Stopic, S., Friedrich, P.B., Recovery of submicron cobalt-powder by acidic leaching of cemented carbide scrap. EMC 2005, 2005, 1725–1738.
Kojima, T., Shimizu, T., Sasai, R., Itoh, H., Recycling process of WC-co cermets by hydrothermal treatment. J. Mater. Sci. 40 (2005), 5167–5172, 10.1007/s10853-005-4407-0.
Seo, B., Kim, S., Cobalt extraction from tungsten carbide-cobalt (WC-co) hard metal scraps using malic acid. Int. J. Miner. Process. 151 (2016), 1–7, 10.1016/j.minpro.2016.04.002.
Kim, S., Seo, B., Son, S., Dissolution behavior of cobalt from WC – co hard metal scraps by oxidation and wet milling process. Hydrometallurgy. 143 (2014), 28–33, 10.1016/j.hydromet.2014.01.004.
Srivastava, R.R., Lee, J., Bae, M., Kumar, V., Reclamation of tungsten from carbide scraps and spent materials. J. Mater. Sci. 54 (2019), 83–107, 10.1007/s10853-018-2876-1.
Mégret, A., Vitry, V., Delaunois, F., Study of the processing of a recycled WC-co powder : can it compete with conventional WC-Co powders ?. J. Sustain. Metall. 7 (2021), 448–458, 10.1007/s40831-021-00346-2.
Upadhyaya, G.S., Some issues in sintering science and technology. Mater. Chem. Phys. 67 (2001), 1–5, 10.1016/S0254-0584(00)00411-9.
Zhang, F., Shen, J., Sun, J., The effect of phosphorus additions on densification, grain growth and properties of nanocrystalline WC-co composites. J. Alloys Compd. 385 (2004), 96–103, 10.1016/j.jallcom.2004.04.110.
García, J., Ciprés, V.C., Blomqvist, A., Kaplan, B., Cemented carbide microstructures: a review. Int. J. Refract. Met. Hard Mater. 80 (2019), 40–68, 10.1016/j.ijrmhm.2018.12.004.
Shetty, D.K., Wright, I.G., Nincer, P.N., Clauer, A.H., Indentation fracture of WC-co cermets. J. Mater. Sci. 20 (1985), 1873–1882.
Schubert, W.D., Neumeister, H., Kinger, G., Lux, B., Hardness to toughness relationship of fine-grained WC-Co hardmetals. Int. J. Refract. Met. Hard Mater. 16 (1998), 133–142, 10.1016/S0263-4368(98)00028-6.
Fang, Z.Z., Maheshwari, P., Wang, X., Sohn, H.Y., Griffo, A., Riley, R., An experimental study of the sintering of nanocrystalline WC-Co powders. Int. J. Refract. Met. Hard Mater. 23 (2005), 249–257, 10.1016/j.ijrmhm.2005.04.014.
Konyashin, I., Ries, B., Cemented Carbides. 2022, Elsevier.
Upadhyaya, G., Materials science of cemented carbides — an overview. Mater. Des. 22 (2001), 483–489, 10.1016/S0261-3069(01)00007-3.
Jia, K., Fischer, T.E., Gallois, B., Microstructure, hardness and toughness of nanostructured and conventional WC-Co composites. Nanostruct. Mater. 10 (1998), 875–891, 10.1016/S0965-9773(98)00123-8.
Xiang, Z., Li, Z., Chang, F., Dai, P., Effect of heat treatment on the microstructure and properties of ultrafine WC-co cemented carbide. Metals (Basel) 9 (2019), 1–12.
Bounhoure, V., Lay, S., Charlot, F., Antoni-Zdziobek, A., Pauty, E., Missiaen, J.M., Effect of C content on the microstructure evolution during early solid state sintering of WC-co alloys. Int. J. Refract. Met. Hard Mater. 44 (2014), 27–34, 10.1016/j.ijrmhm.2013.12.012.
Mégret, A., Vitry, V., Delaunois, F., The effect of temperature on sintering and mechanical properties of boron doped WC- 10Co composites. Ceram. Int., 2022 Submitted.
Zhao, S., Song, X., Zhang, J., Liu, X., Effects of scale combination and contact condition of raw powders on SPS sintered near-nanocrystalline WC-Co alloy. Mater. Sci. Eng. A 473 (2008), 323–329, 10.1016/j.msea.2007.04.094.
Wu, C.C., Chang, S.H., Tang, T.P., Peng, K.Y., Chang, W.C., Study on the properties of WC-10Co alloys adding Cr3C2 powder via various vacuum sintering temperatures. J. Alloys Compd. 686 (2016), 810–815, 10.1016/j.jallcom.2016.06.221.
Xiao, D. Hong, He, Y. Hui, Luo, W. Hong, Song, M., Effect of VC and NbC additions on microstructure and properties of ultrafine WC-10Co cemented carbides. Trans. Nonferrous Met. Soc. China (English Ed.) 19 (2009), 1520–1525, 10.1016/S1003-6326(09)60063-7.
Ou, X.Q., Song, M., Shen, T.T., Xiao, D.H., He, Y.H., Fabrication and mechanical properties of ultrafine grained WC-10Co-0.45Cr3C2-0.25VC alloys. Int. J. Refract. Met. Hard Mater. 29 (2011), 260–267, 10.1016/j.ijrmhm.2010.11.004.
Zhu, L.H., Huang, Q.W., Zhao, H.F., Preparation of nanocrystalline WC-10Co-0. 8VC by spark plasma sintering. J. Mater. Lett. 22 (2003), 1631–1633, 10.1023/A:1026357129534.
Cha, S.I., Hong, S.H., Kim, B.K., Spark plasma sintering behavior of nanocrystalline WC-10Co cemented carbide powders. Mater. Sci. Eng. A 351 (2003), 31–38, 10.1016/S0921-5093(02)00605-6.
Chychko, A., García, J., Collado Ciprés, V., Holmström, E., Blomqvist, A., HV-KIC property charts of cemented carbides: a comprehensive data collection. Int. J. Refract. Met. Hard Mater., 103, 2022, 105763, 10.1016/j.ijrmhm.2021.105763.
Pirso, J., Juhani, K., Tarraste, M., VIljus, M., Letunovits, S., The effect of VC, TiC and Cr3C2 on the microstructure and properties of WC-15Co harmetals fabricated by the reactive sintering. 9th Int. DAAAM Balt. Conf., Tallinn, 2014, 2–26.
