Effect of carbon content on the microstructure and mechanical properties of Ti(C, N)-based cermets

Zheng, Yong; Liu, Wenjun; Wang, Shengxiang; Xiong, Weihao

doi:10.1016/j.ceramint.2003.11.016

Cited by 65 publications

(33 citation statements)

References 7 publications

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“…Although carbon nanotubes have high thermo stability, some of them would resolve in the form of C atoms during sintering process. It was reported that the lattice parameters of Ni phase decrease with increasing carbon addition [23]. Clearly, the XRD results correspond well with EDX results in the present study.…”

Section: Microstructuresupporting

confidence: 80%

Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(C,N)-based cermets

Liu

Jiang

2018

J Adv Ceram

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Abstract:The surface modification of multi-walled carbon nanotubes (MWCNTs) was carried out using plasma treatment. The microstructures of the prepared cermets with different additions of MWCNTs were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDX), and X-ray diffraction (XRD). Mechanical properties such as transverse rupture strength (TRS), fracture toughness (K IC ), and hardness (HRA) were measured. The results showed that some reactive groups were successfully modified on the surface of MWCNTs, resulting in the improvement of dispersibility. Most of the amorphous carbons and impurities were peeled from the MWCNTs. Increasing MWCNT addition decreased the dissolution of tungsten, titanium, and molybdenum in the binder phase. The cermet with 0.5 wt% MWCNT addition showed the highest TRS and fracture toughness. The strengthening mechanisms were attributed to the finer grain size, the homogeneous microstructure, and the higher volume fraction of binder phase in the binder. The toughening mechanisms were characterized by bridging and pulling-out.

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Section: Microstructuresupporting

confidence: 80%

Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(C,N)-based cermets

Liu

Jiang

2018

J Adv Ceram

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“…Moreover, it has been observed in Ti(C,N)-based cermets that the grain growth rate of ceramic particles depends on the particles' solubility in the binder, which in turn depends on the C/N ratio, decreasing with a decrease in carbon content [35]. In this respect, it has been reported that the use of carbon as an additive can modify the microstructure and mechanical properties of cermets, as the dissolution of ceramic particles is affected [36,37]. Some authors have indicated that the presence of intermetallic phases observed in cermets is the consequence of the considerable dissolution of Ti in the molten binder promoted by denitridation processes, especially when sintering is performed under low nitrogen partial pressure [38].…”

Section: Introductionmentioning

confidence: 99%

Toughening of complete solid solution cermets by graphite addition

Chicardi

Torres

Sayagués

et al. 2015

Chemical Engineering Journal

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Abstract(Ti 0.95 Ta 0.05 )(C 0.5 N 0.5 )-Co complete solid solution cermets (CSCs) were developed by a mechanochemical synthesis process and a pressureless sintering method. The effect of different percentages of graphite used as a sintering additive on the nature of the binder phase and the mechanical properties of the cermets was investigated. Microstructural and mechanical characterisations were carried out by X-ray diffraction, optical microscopy, scanning electron microscopy, transmission electron microscopy, energydispersive X-ray spectroscopy, Vickers hardness, indentation fracture toughness and nanoindentation. The addition of graphite modified the carbon activity during sintering, reducing the dissolution of carbonitride ceramic particles into the molten binder. The amount of Ti and Ta remaining in the binder after sintering gradually decreased as the amount of graphite added increased, which induced a change in the nature of the binder phase. When no graphite was added, the binder consisted of the brittle Ti x Ta 1-x Co 2 intermetallic phase. With the increase in the amount of graphite added, the formation of more ductile phases, such as Ti x Ta 1-x Co 3 and -Co, was observed, causing a significant improvement in the toughness of the cermets.

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“…Many research works have highlighted the influence of the carbon content on the properties of TiCN-based cermets [16,17,18,19]. These works refers to Co/Ni matrices, but no investigations have been found for Fe based matrices.…”

Section: Introductionmentioning

confidence: 99%

Microstructural development and mechanical properties of iron based cermets processed by pressureless and spark plasma sintering

Alvaredo

Gordo

Biest

et al. 2012

Materials Science and Engineering: A

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Iron-based cermets are an interesting class of metal-ceramic composites which properties and the factors influencing then are to be explored. In this work the metal matrix contains Cr, W, Mo and V as alloying elements, and the hard phase is constituted by 50 vol % of titanium carbonitride (TiCN) particles. The work studies the influence of the C content and the processing method on the sinterability, microstructure and hardness of the developed cermet materials. For that purpose, cermet samples with different C content in the matrix (0 wt%, 0.25 wt%, 0.5 wt%, 1.0 wt%) were prepared by conventional pressureless sintering (CPS) and, in order to achieve finer microstructures and to reduce the sintering time, by Spark Plasma Sintering (SPS). The density and hardness (HV30) of the processed materials was evaluated, while their phase composition and microstructure was characterised by X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM), respectively. The equilibrium phase diagram of the composite material was calculated by ThermoCalc software in order to elucidate the influence of the carbon content on the obtained phases and developed microstructures.

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Effect of carbon content on the microstructure and mechanical properties of Ti(C, N)-based cermets

Cited by 65 publications

References 7 publications

Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(C,N)-based cermets

Effect of multi-walled carbon nanotube addition on the microstructures and mechanical properties of Ti(C,N)-based cermets

Toughening of complete solid solution cermets by graphite addition

Microstructural development and mechanical properties of iron based cermets processed by pressureless and spark plasma sintering

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