The Study of Co-Doped NbC / Cr₃C₂ on the Application of Ultrafine WC-10%Co Cemented Carbides

Abstract:

In this paper, ultrafine WC-10%Co cemented carbides were prepared by vacuum sintering. For inhibition of growth of WC grains during sintering, NbC and Cr₃C₂ were used as inhibitors. With the transformation of co-doped inhibitors content, the grain growth is inhibited and the grain size achieves 490 nm at 0.4% Cr₃C₂ / 0.3% NbC. The mechanism that co-doped NbC / Cr₃C₂ on the effective reduction of ultrafine WC-10%Co cemented carbides was analyzed. The 0.4% Cr₃C₂ / 0.3% NbC addition equipped with the best integrated mechanical properties was obtained in this study. And sintered samples were investigated with scanning and transmission electron microscopy (SEM).

• Periodical: Applied Mechanics and Materials (Volume 320)
• Pages: 320-324
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.320.320
• Online since: May 2013
• Authors: Hao Yu, Xian Quan Jiang, Ai Min Jiang, Rong Yu, Jin Wei Wang
• Keywords: Alloy, Application, Microstructure

References

[1] Kawakami M, Terada O, Hayashi K (2006) J Jpn Soc Powder Powder Metall 53:166

[2] Schubert WD, Lassner E. Tungsten — still very much an element of lighting. The light bulb in the focus of global warming. Brussels: ITIA Newslette r; June 2007.p.2 –10.

[3] Tjong S.C. and ChenH., Nanocrystalline materials and coatings, Mater. Sci. Eng R, 2004, 45: 1.

[4] Bonache V, Ray n E, Salvador M D, et al. Nanoindentation study of WC-12%Co hardmetals obtained from nanocrystalline powders: Evaluation of hardness and modulus on individual phases [J]. Materials Science and Engineering A, 2010, 1: 2935-2941.

DOI: 10.1016/j.msea.2010.01.026

[5] Morton C.W., Wills D.J., and Stjernberg K., The temperature ranges for maximum effectiveness of grain growth inhibitors in WC-Co alloys, Int. J. Refract. Met. Hard Mater., 2007, 23: 287.

DOI: 10.1016/j.ijrmhm.2005.05.011

[6] H.J. Park, Y.K. Park, I.J. Dong, J.K. Jeon, J.H. Yim, K.E. Jeong, Res. Chem. Intermed. 34(8–9), 727–735 (2008)

DOI: 10.1007/bf03036931

[7] PETERSSON A, AGREN J. Sintering shrinkage of WC-Co materials with bimodal grain size distribution [J]. Acta Mat, 2005, 53(6): 1665í1671.

DOI: 10.1016/j.actamat.2004.12.016

[8] MORTON C W, WILLS D J, STJERNBERG K. The temperature ranges of maximum effectiveness of grain growth inhibitors in WC alloys [J]. Int J Ref Met Mat, 2005, 23(4-6): 287-293.).

DOI: 10.1016/j.ijrmhm.2005.05.011

[9] Kawakami M, Teranda O, Hayashi K. Segregation amount of dopants at WC/Co interface in Cr3C2 and VC+Cr3C2-doped WC–Co submicro-grained hardmetals. In: Kneringer G, Rodhammer P,Wildner H, editors. Proceedings of the 16th International Plansee Seminar, vol. 2. Reutte: Plansee Holding AG; 2005. p.653–67.

DOI: 10.2497/jjspm.53.166

[10] S.G. Huang R.L. Liu, L. Li,O.Van derBiest,NbC as grain growth inhibitor and carbide inWC–Co hardmetals, Int. J. Refract. Met. Hard Mater., 2007 in press.)

[11] Carroll D.F., Sintering and microstructural development in WC/Co-based alloys made with superfine WC powder, Int. J. Refract. Met. Hard Mater., 1999, 17: 123.

DOI: 10.1016/s0263-4368(98)00073-0

[12] Gille G, Szesny B, Dreyer K, van den Berg H, Schmidt J,Gestrich T, Leitner G (2002) Int J Ref Met Hard Mater 20:3

DOI: 10.1016/s0263-4368(01)00066-x

[13] Da Silva A.G.P., De Souza C.P., Gomes U.U., Medeiros F.F.P., Ciaravino C., and Roubin M., A low temperature synthesized NbC as grain growth inhibitor for WC-Co composites, Mater. Sci. Eng. A, 2000, 30: 242.

DOI: 10.1016/s0921-5093(00)00993-x

[14] Brieseck M, Bohn M, Lengauer W (2010) J Alloys Compounds 489:408

[15] Lay S, Hamar-Thibault S, Lackner A (2002) Int J Ref Met Hard Mater 20:61

[16] Shatov A V, Ponomarev S S, Firstov S A, et al. The contiguity of carbide crystals of different shapes in cemented carbides [J]. International Journal of Refractory Metals Hard Materials, 2006, 24(1-2):61.

DOI: 10.1016/j.ijrmhm.2005.03.003

[17] Lay S, Hamar-Thibault S, Lackner A. Location of VC in VC, Cr3C2 codoped WC–Co cermets by HREM and EELS. Int J Refract Met Hard Mat 2002;20:61–9.

DOI: 10.1016/s0263-4368(01)00071-3

[18] Weidow J, Zackrisson J, Jansson B, Andrén H-O. Characterization of WC–Co with cubic carbide additions. Int J Refract Met Hard Mater 2009;27:244–8.

DOI: 10.1016/j.ijrmhm.2008.11.007

[19] Sun L., Jia C.C., Lin C.G.., and Cao R.J., VC addition prepared ultrafine WC-11Co composites by spark plasma sintering, J. Iron Steel, 2007, 14: 85.

DOI: 10.1016/s1006-706x(08)60057-6

[20] Eso Oladapo, Fang Zhigang Zak, Griffo Anthony. Kinetics of cobalt gradient formation during the liquid phase sintering of functionally graded WC–Co. Int J Refract Met H 2007;25:286–92

DOI: 10.1016/j.ijrmhm.2006.07.002

[21] Fan Peng, Eso Oladapo O, Fang Zhigang Zak, Sohn HY. Effect of WC particle size on Co distribution in liquid-phase-sintered functionally graded WC–Co composite. Int J Refract Met H 2008;26:98–105.

DOI: 10.1016/j.ijrmhm.2007.02.003