The characterizations of superconducting MoC/Mo<sub>2</sub>C nanocomposites embedded in a magnetic graphite matrix

Wang, Z. H.; Li, Didi; Geng, D. Y.; Ma, Song; Liu, W.; Zhang, Z. D.

doi:10.1002/pssa.200824083

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…During the sintering/melting step in the SPS process, the metallic phase forms a liquid in which dissolution and transport of the molybdenum mass takes place. The observed transformations can be explained by the possibility of spinodal decomposition of the nc-(Ti,Mo)C carbide into TiC and metastable MoC carbides [ 32 , 33 , 34 ]. Under such conditions, the reaction between titanium matrix and MoC occurred according to the equation: Ti + MoC = TiC + Mo …”

Section: Resultsmentioning

confidence: 99%

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

et al. 2021

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This paper describes the microstructure and properties of titanium-based composites obtained as a result of a reactive spark plasma sintering of a mixture of titanium and nanostructured (Ti,Mo)C-type carbide in a carbon shell. Composites with different ceramic addition mass percentage (10 and 20 wt %) were produced. Effect of content of elemental carbon covering nc-(Ti,Mo)C reinforcing phase particles on the microstructure, mechanical, tribological, and corrosion properties of the titanium-based composites was investigated. The microstructural evolution, mechanical properties, and tribological behavior of the Ti + (Ti,Mo)C/C composites were evaluated using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), electron backscatter diffraction analysis (EBSD), X-ray photoelectron spectroscopy (XPS), 3D confocal laser scanning microscopy, nanoindentation, and ball-on-disk wear test. Moreover, corrosion resistance in a 3.5 wt % NaCl solution at RT were also investigated. It was found that the carbon content affected the tested properties. With the increase of carbon content from ca. 3 to 40 wt % in the (Ti,Mo)C/C reinforcing phase, an increase in the Young’s modulus, hardness, and fracture toughness of spark plasma sintered composites was observed. The results of abrasive and corrosive resistance tests were presented and compared with experimental data obtained for cp-Ti and Ti-6Al-4V alloy without the reinforcing phase. Moreover, it was found that an increase in the percentage of carbon increased the resistance to abrasive wear and to electrochemical corrosion of composites, measured by the relatively lower values of the friction coefficient and volume of wear and higher values of resistance polarization. This resistance results from the fact that a stable of TiO2 layer doped with MoO3 is formed on the surface of the composites. The results of experimental studies on the composites were compared with those obtained for cp-Ti and Ti-6Al-4V alloy without the reinforcing phase.

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Section: Resultsmentioning

confidence: 99%

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

et al. 2021

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“…37 Although it can be seen from XPS Mo 3d spectra that all the samples contained Mo 2+ carbide species on the surfaces, only the C 1s signal of M-800 showed a peak at 283.6 eV, corresponding to carbidic carbon involved in Mo-C bonds. 38 This was probably due to the fact that in the case of other samples, the carbidic carbon species were so low in concentration that their corresponding peak areas were overshadowed by those of sp 2 carbon. Subsequently, further information regarding the carbon deposit during the carburization process was obtained by Raman spectroscopy (Fig.…”

Section: Preparation and Characterization Of Mo Carbidesmentioning

confidence: 98%

“…The peak at a binding energy of 228.5 eV was assigned to Mo 3d 5/2 of Mo 2+ (carbide), [31][32][33] Table 2 that, no matter whether it was bulk or supported sample, the concentration of Mo 2+ carbide rapidly increased upon increasing the carburizing temperature from 650 to 800 1C. 38 This was probably due to the fact that in the case of other samples, the carbidic carbon species were so low in concentration that their corresponding peak areas were overshadowed by those of sp 2 carbon. These results indicated that both the increase of temperature and the replacement of RH by the PH method could promote the carburization process, which was in accordance with the observation of XRD patterns ( Fig.…”

Section: Preparation and Characterization Of Mo Carbidesmentioning

confidence: 99%

A novel approach to the synthesis of bulk and supported β-Mo₂C using dimethyl ether as a carbon source

et al. 2015

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A novel approach to the synthesis of bulk and supported b-Mo 2 C using dimethyl ether as a carbon source † In view of the fact that H 2 was necessarily added into gas-state carbon sources in order to remove the surface carbon barrier for the complete carburization of Mo oxides to form Mo carbides, in this paper we proposed a simple synthetic route to overcome this issue. The current approach used a new carbon source, dimethyl ether (DME), as feed gas without H 2 addition and employed a pre-heating (PH) method before introducing DME into the reactor. With this novel approach we successfully prepared bulk and CNT supported molybdenum carbides. Note that the removal of carbon deposit by H 2 from DME thermal decomposition and PH-induced surface reconstruction can promote the carburization process. The formation mechanism of Mo carbides was proposed using X-ray diffraction (XRD) and rapid heating reaction mass spectrometry (RH-MS) characterizations. The complete synthesis process involved reduction-carburization of Mo precursors by DME and their thermal decomposition product CH 4 , via the pathway of MoO 3 / Mo 4 O 11 -MoO 2 -MoO x C y /MoC 1Àxb-Mo 2 C. The composition of gas-phase products was predominantly H 2 , CO and CH 4 with a very small amount of CO 2 and (or almost no) H 2 O.

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“…Similarly to most carbides, the structure can accommodate a large concentration of defects on the "interstitial" carbon positions, leading to substoichiometric TiC 1-x , with 0.535 < x < 0.023. The binary Mo-C system has several phases most of which have two compositions, MoC and Mo 2 C. The stoichiometric fcc-MoC phase, which crystallizes in a NaCl-type structure (B1-type) is metastable [16]. Important features such as the carbon nonstoichiometry and a possible ordered structure for the carbon vacancies still remain unexplained up to date.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Figiel

Biedunkiewicz

et al. 2019

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The addition of hard ceramic particles of nc-(Ti,Mo)C in carbon network into Ti matrix has been proved to be an efficient way to enhance their properties. The purpose of this work was to analyze the corrosion, tribological, mechanical and morphological effects of combining nc-(Ti,Mo)C/C with titanium metal, to create a unique composite via selective laser melting technique (SLM). Composites with different weight percentage (5, 10 and 20 wt %) of ceramic phase were produced. The samples of pure Ti and Ti-6Al-4V alloy were also tested, as a reference. These composites were examined for corrosion resistance in body fluid (artificial saliva solution). Moreover, the properties of titanium composites reinforced with nc-TiC powders were compared. It was stated that mechanical properties were significantly improved with increasing amount of nc-(Ti,Mo)C/C in Ti matrix. In terms of corrosion resistance, the composites showed worse properties compared to pure titanium and Ti-6Al-4V alloy, but better than TiC-reinforced composites.

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The characterizations of superconducting MoC/Mo₂C nanocomposites embedded in a magnetic graphite matrix

Cited by 8 publications

References 33 publications

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

A novel approach to the synthesis of bulk and supported β-Mo₂C using dimethyl ether as a carbon source

Archives of Metallurgy and Materials

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The characterizations of superconducting MoC/Mo2C nanocomposites embedded in a magnetic graphite matrix

Cited by 8 publications

References 33 publications

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

Influence of Elemental Carbon (EC) Coating Covering nc-(Ti,Mo)C Particles on the Microstructure and Properties of Titanium Matrix Composites Prepared by Reactive Spark Plasma Sintering

A novel approach to the synthesis of bulk and supported β-Mo2C using dimethyl ether as a carbon source

Archives of Metallurgy and Materials

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Product

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The characterizations of superconducting MoC/Mo₂C nanocomposites embedded in a magnetic graphite matrix

A novel approach to the synthesis of bulk and supported β-Mo₂C using dimethyl ether as a carbon source