Effect of Mo2C addition on the microstructures and mechanical properties of WC–SiC ceramics

Nino, Akihiro; Nakaibayashi, Yoshinao; Sugiyama, Shigeaki; Taimatsu, Hitoshi

doi:10.1016/j.ijrmhm.2016.12.018

Cited by 16 publications

(3 citation statements)

References 22 publications

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“…However, while initially appealing, caution should be exercised as the mechanism of the WC sinterability improvement by SiC addition, to data, is still unclear and WC–SiC composites, possessing only a small market share, were employed only to a limited extent for specialized applications. Moreover, it is noted that SiC addition tended to result in the abnormal growth of WC grains; thus, some grain growth inhibitors such as ZrC [ 71 ], NbC [ 72 ], Mo 2 C [ 89 ], VC [ 56 ], and Cr 3 C 2 [ 86 , 90 ] are required to obtain the excellent microstructure as well as mechanical properties.…”

Section: Densification Of Binderless Tungsten Carbidementioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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HIGHLIGHTS• Establish processing-composition-microstructure-property relationships governing binderless tungsten carbide (BTC).• Highlight the densification improving strategies and toughening methods for BTC.• Provide key challenges as well as the outlook for superior peformance associated with BTC.ABSTRACT WC-Co alloys have enjoyed great practical significance owing to their excellent properties during the past decades. Despite the advantages, however, recently there have been concerns about the challenges associated with the use of Co, i.e. price instability, toxicity and properties degeneration, which necessitates the fabrication of binderless tungsten carbide (BTC). On the other hand, BTC or BTC composites, none of them, to date has been commercialized and produced on an industrial scale, but only used to a limited extent for specialized applications, such as mechanical seals undergoing high burthen as well as high temperature electrical contacts. There are two challenges in developing BTC: fully densifying the sintered body together with achieving a high toughness. Thus, this review applies towards comprehensively summarize the current knowledge of sintering behavior, microstructure, and mechanical properties of BTC, highlighting the densification improving strategies as well as toughening methods, so as to provide reference for those who would like to enhance the performance of BTC with better reliability advancing them to further wide applications and prepare the material in a way that is environment friendly, harmless to human health and low in production cost. This paper shows that the fabrication of highly dense and high-performance BTC is economically and technically feasible. The properties of BTC can be tailored by judiciously selecting the chemical composition coupled with taking into careful account the effects of processing techniques and parameters.

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Section: Densification Of Binderless Tungsten Carbidementioning

confidence: 99%

A Review on Binderless Tungsten Carbide: Development and Application

et al. 2019

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“…Thus, they should only be a complement and should have their addition controlled [ 21 ]. According to several investigators [ 18 , 19 , 22 , 23 ], additions of Mo 2 C larger than 2 wt.% do not improve the mechanical properties of the cemented carbide. On the contrary, it may cause the reverse effect.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of Corrosion Behaviors of WC-NiMo and WC-Co Cemented Carbides

et al. 2023

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In this paper, the influence of a nickel binder metal and molybdenum carbide as an additional alloying element on the microstructure and corrosion behavior of WC-based cemented carbides, processed by conventional powder metallurgy, was studied, and a comparison with conventional cemented carbide (WC-Co) was carried out. The sintered alloys were characterized, before and after corrosive tests, by analyses using optical microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, and X-ray diffraction. The corrosion resistance of the cemented carbides was investigated by open circuit potential, potentiodynamic polarization, and electrochemical impedance spectroscopy in a 3.5 wt.% NaCl solution. The WC-NiMo cemented carbides showed microstructures similar to those of WC-Co; however, pores and binder islands were observed in the microstructures. The corrosion tests showed promising results, the WC-NiMo cemented carbide showed superior corrosion resistance and higher passivation capacity than the WC-Co cemented carbide. The WC-NiMo alloy showed a higher EOC ≈−0.18 V vs. Ag|AgCl|KCl3mol/L than the WC-Co (EOC≈−0.45 V vs. Ag|AgCl|KCl3mol/L). The potentiodynamic polarization curves showed lower current density values throughout the potential range for the WC-NiMo alloy, and it was observed that Ecorr was less negative (≈−0.416 V vs. Ag|AgCl|KCl3mol/L) than for WC-Co (≈−0.543 V vs. V vs. Ag|AgCl|KCl3mol/L). The EIS analysis confirmed low rate corrosion of WC-NiMo associated with the formation of a passive thin layer. This alloy showed a higher Rct (1970.70 Ω).

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“…Binderless tungsten carbide has received wide attention of scholars worldwide because of its higher hardness (Imasato et al, 1995;Tsai et al, 2010), better abrasion resistance and corrosion resistance (Engqvist et al, 1999;Beste et al, 2001;Hussainova et al, 2014;Wang et al, 2018) compared with the conventional tungsten carbide with metallic binder cobalt. To address the drawbacks such as the high sintering temperature, low density and poor fracture toughness of the binderless tungsten carbide, researchers have carried out extensive studies and proposed a variety of methods to lower the sintering temperature and improve the mechanical properties (Zheng et al, 2013;Ren et al, 2015;Kwak et al, 2016;Nino et al, 2017;Wang et al, 2018). Nevertheless, there have been few reports on the oxidation process of the binderless tungsten carbide.…”

Section: Introductionmentioning

confidence: 99%

Effect of Y2O3 Addition on High-Temperature Oxidation of Binderless Tungsten Carbide

et al. 2021

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High-temperature oxidation tests were carried out on binderless tungsten carbide (WC) with different Y2O3 contents (0, 1, 2, 3, and 4 wt.%) and on YG3 cemented carbide. Results demonstrated that the addition of Y2O3 led to a significant improvement in the high-temperature oxidation resistance of binderless tungsten carbide compared with those of YG3 cemented carbide and pure tungsten carbide. After oxidation at 800°C for 120 min, the oxidation weight gain of binderless tungsten carbide with 1 wt.% Y2O3 was 58.54 mg cm−2, corresponding to the reduction by 47.7% compared with YG3 cemented carbide. In the high temperature oxidation process, WC in the triangle grain boundary was first oxidized to Y2WO6 due to the high activity of Y2O3 which is present mainly in the WC grain boundaries. The transport of W4+ outward along the grain boundary and the diffusion of O2− inward along the grain boundary were hindered by Y2WO6 with the high ionic radius and thus the antioxidant capacity of binderless tungsten carbide was improved. Meanwhile, the adhesive ability of oxidation layer on the substrate was enhanced with the “pinning effect” of Y2WO6, which also led to the improvement of oxidation resistance. With the Y2O3 content increasing from 1 to 4 wt.%, the antioxidant properties of binderless tungsten carbide gradually declined, and the antioxidant performance of binderless tungsten carbide with 1 wt.% Y2O3 was found to be the best.

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Effect of Mo2C addition on the microstructures and mechanical properties of WC–SiC ceramics

Cited by 16 publications

References 22 publications

A Review on Binderless Tungsten Carbide: Development and Application

A Review on Binderless Tungsten Carbide: Development and Application

Comparative Study of Corrosion Behaviors of WC-NiMo and WC-Co Cemented Carbides

Effect of Y2O3 Addition on High-Temperature Oxidation of Binderless Tungsten Carbide

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