WC-Ni-SiCw Alloys Prepared by Hot-Pressed Sintering

Abstract:

WC-Ni-SiCw alloys were prepared through hot-pressed sintering by using WC, Ni, VC, TaC and SiC nano-whisker as raw materials. The influence of SiC whisker addition on the microstructure and mechanical properties of the as-prepared WC-Ni alloys was investigated. Except WC hard phase and Ni binder phase, no other phase was detected by X-ray diffraction. The observations by scanning electron microscope demonstrated that there were some micropores in the as-prepared materials, and their size and quantity increased with increasing amount of SiCw. Vickers hardness and flexural strength tests indicated that the bulk hardness of WC-Ni-SiCw alloys slightly decreased with increasing amount of SiCw; and the flexural strength increased at first and then decreased with increasing amount of SiCw. The alloys with 0.53 wt% SiCw presented the highest flexural strength of 1700 MPa.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 928-931
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.928
• Online since: June 2012
• Authors: Xiao Yong Ren, Zhi Jian Peng, Hui Yong Rong, Ying Peng, Zhi Qiang Fu, Cheng Biao Wang, Yue Wen, Long Hao Qi, He Zhuo Miao
• Keywords: Hot-Pressed Sintering, Mechanical Property, SiC Whisker, WC-Ni Alloy

References

[1] V.B. Voitovich, V.V. Sverdel, R.F. Voitovich, et al, Oxidation of WC-Co, WC-Ni and WC-Co-Ni Hard Metals in the Temperature Range 500-800 °C, Int. J. Refract. Met. Hard Mater. 14 (1996) 289-295.

DOI: 10.1016/0263-4368(96)00009-1

[2] E.O. Correa, J.N. Santos, A.N. Klein, Microstructure and mechanical properties of WC-Ni-Si based cemented carbides developed by powder metallurgy, Int. J. Refract. Met. Hard. Mater. 28 (2010) 572-575.

DOI: 10.1016/j.ijrmhm.2010.04.003

[3] T.W. Penrice, Alternative Binders for Hard Metals, J. Mater. Shaping Technol. 5 (1987) 35-39.

[4] E.T. Nassaj, S.H. Mirhosseini, An in situ WC-Ni composite fabricated by the SHS method, J. Mater. Process. Technol. 142 (2003) 422-426.

DOI: 10.1016/s0924-0136(03)00621-6

[5] I.J. Shon, I.K. Jeong, I.Y. Ko, et al, Sintering behavior and mechanical properties of WC-10Co, WC-10Ni and WC-10Fe hard materials produced by high-frequency induction heated sintering, Ceram. Int. 35 (2009) 339-344.

DOI: 10.1016/j.ceramint.2007.11.003

[6] H.Y. Rong, Z.J. Peng, X.Y. Ren, et al, Microstructure and mechanical properties of ultrafine WC-Ni-VC-TaC-cBN cemented carbides fabricated by spark plasma sintering, Int. J. Refract. Met. Hard. Mater. 29 (2011) 733-738.

DOI: 10.1016/j.ijrmhm.2011.06.004

[7] S. Sugiyama, D. Kudo, H. Taimatsu, Preparation of WC-SiC whisker composites by hot pressing and their mechanical properties, Mater. Trans. 49 (2008) 1644-1649.

DOI: 10.2320/matertrans.mra2008019

[8] P.F. Becher, G.C. Wei, Toughening Behavior in Sic-Whisker-Reinforced Alumina, J. Am. Ceram. Soc. 67 (1984) 267-269.

DOI: 10.1111/j.1151-2916.1984.tb19694.x

[9] P. Wu, Y. Zheng, Y.L. Zhao, et al, Effect of SiC whisker addition on the microstructures and mechanical properties of Ti(C, N)-based cermets, Mater. Des. 32 (2011) 951-956.

DOI: 10.1016/j.matdes.2010.07.028