Different effects of Cr3C2 and VC on the sintering behavior of WC–Co materials.
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| Title: | Different effects of Cr3C2 and VC on the sintering behavior of WC–Co materials. |
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| Authors: | Wang, Hongtao1 hongtao.wang@kennametal.com, Webb, Tim1, Bitler, Jonathan W.1 |
| Source: | International Journal of Refractory Metals & Hard Materials. Nov2015 Part B, Vol. 53, p117-122. 6p. |
| Subjects: | Tungsten-cobalt alloys, Carbides, Sintering, Dilatometers, Gas analysis, Fourier transform infrared spectrophotometers |
| Abstract: | Cr 3 C 2 and VC are two typical grain growth inhibitors used in producing fine grain microstructure in WC–Co materials. In this investigation, the sintering processes of Cr 3 C 2 and VC doped submicron WC–Co powders were studied by using dilatometry, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and evolved gas analysis (EGA) by Fourier Transform Infrared Spectrophotometry (FT-IR). The combination of these methods can provide a comprehensive understanding of sintering processes of Cr 3 C 2 and VC doped WC–Co powders during heating. Results show that, below 900 °C, similar sintering behaviors were observed for both Cr 3 C 2 and VC doped WC–Co powders, showing a wax vaporization process in the range of 200 °C to 400 °C, and tungsten oxide reduction by carbon occurring around 800 °C. Onset of densification begins around 900 °C. Differences in sintering reaction and densification were observed above 900 °C. First, VC doping shows an outgassing reaction and a clear shrinkage inflection, increase in shrinkage rate, in the dilatometer curve between 900 and 1100 °C, while Cr 3 C 2 doping shows only slight outgassing and no shrinkage inflection in the dilatometer response within the same temperature range. Second, Cr 3 C 2 doping shows a strong outgassing reaction in the 1200–1400 °C range, which was not evident in the VC doped material. Third, Cr 3 C 2 doping also shows a higher melting temperature than VC doping. Possible mechanisms for these different sintering reactions and resulting sintering behaviors have been discussed in this paper. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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