Preliminary study of spark plasma sintered VC-Ni alloys
- PDF / 638,060 Bytes
- 6 Pages / 432 x 648 pts Page_size
- 100 Downloads / 224 Views
MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.462
Preliminary study of spark plasma sintered VC-Ni alloys A.A. Fabuyidea,b,*, J.O. Borodea,c, L.A. Cornisha,b,d a
African Materials Science and Engineering Network (AMSEN, A Carnegie IAS Network)
b
School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, South Africa
c
Department of Metallurgical and Materials Engineering, Federal University of Technology, Akure, Nigeria
d
DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand
Corresponding author: Adefunke Fabuyide ([email protected])
Abstract
Vanadium carbide has outstanding tribological behaviour, superior to other similar carbides in Groups IVB and VB, except TiC. Most research on vanadium carbide uses it as an additive to enhance wear performance, inhibit grain growth and decrease density, and it has also been used as a partial replacement for WC in WC-Co. This work is on alloys of VC-Ni to provide potential lighter and more corrosion-resistant materials, and VC-Ni alloys were made by this method for the first time, and evaluated. Three alloys of compositions VC-4Ni, VC-10Ni and VC-22.1Ni (at.%) were produced by spark plasma sintering (SPS). The mixed powders were sintered at different temperatures and pressures to optimize the sintered density and hardness of the alloys. The best alloy was VC-10Ni (at.%), which had the highest density and the highest hardness.
INTRODUCTION Vanadium carbide has outstanding tribological behaviour superior to other similar carbides in Groups IVB and VB, except TiC [1, 2]. It is of great significance in industrial applications due to its excellent high temperature strength, high chemical and thermal stability, even at high temperatures. It is commercially used in tool bits and
2003
Downloaded from https://www.cambridge.org/core. Access paid by the UC Berkeley Library, on 04 Aug 2018 at 06:36:53, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2018.462
cutting tools [3-5]. The mechanical properties of hardmetals which determine tool performance depend on the microstructures, and can be improved by modification of microstructure (such as grain size) or microchemistry [6,7]. Vanadium carbide is cheaper, less dense, harder and tougher than the conventional tungsten carbide, and WC-VC-Co has higher hardness for comparable toughness [8-9]. Most research on vanadium carbide is an additive to enhance wear performance, inhibit grain growth and decrease density, and it has also been used as a partial replacement for WC in WC-Co [10-12]. Nickel as a binder has higher resistance to thermal cracking, better oxidation resistance and wear performance in corrosive environment than cobalt [13]. Some studies have been done on VC-Ni alloys [2, 14-16]. Apata et al. [16] produced VC-Ni alloys by casting and V49.1C28.8Ni22.1 (at. %) had 1052 HV5 hardness and the best wear resistance. To improve the microstructure, hen
Data Loading...
