Mechanical properties and oxidation behavior of silicon carbide–molybdenum silicides composites

Magnani, Giuseppe; Brentari, Alida; Burresi, Emiliano; Coglitore, Antonino

doi:10.1016/j.ceramint.2012.10.024

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…As the oxidation progresses violently and a large amount of MoO2 and MoO3 are generated, the thickness of the oxide film begins to increase rapidly. Relevant studies have shown that the structure of the oxide film at 600 °C will have obvious delamination, and that the inner layer is mainly MoO2 and the outer layer is mainly MoO3 [27]. As shown in Fig.…”

Section: Discussionmentioning

confidence: 96%

High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

Han

Bao

Zhu

et al. 2022

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In this paper, the Titanium carbide/Molybdenum (TiC/Mo) alloy was prepared by spark plasma sintering (SPS). The oxidation process of the TiC/Mo alloy at different oxidation temperatures was studied, and the oxidation mechanism was discussed in depth. The focus is on the influence of the introduction of TiC particles on the high-temperature oxidation properties of Mo alloys. The phase composition and morphology of the oxide film were analyzed by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The results showed that, after oxidation, the surface oxide film is mainly composed of Titanium dioxide (TiO2), Molybdenum dioxide (MoO2), Molybdenum trioxide (MoO3) and Molybdenum oxide hydrate (MoO3(H2O)2) phases. As the oxidation temperature increases, the surface of the oxide film will warp, and thereby increase porosity. The dense MoO2 will form a protective inner oxide layer and inhibit further progress of the TiC/Mo alloy. Oxygen will undergo violent oxidation through the pores and the inside of the matrix, and the protective MoO2 internal oxide film will disappear. TiC particles dispersed in the matrix will be oxidized to form TiO2, which will be gradually deposited on the surface of the oxide film, hindering the diffusion of oxygen to the matrix. The quantity loss during the entire oxidation process is significantly reduced. Therefore, the introduction of TiC can greatly improve the oxidation resistance of Mo alloys.

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Section: Discussionmentioning

confidence: 96%

High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

Han

Bao

Zhu

et al. 2022

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“…However, the brittleness at ambient temperature (fracture toughness K IC , approximately 2-3 MPa•m 1/2 ) and low strength at high temperature (σ 0.2 , approximately 20 MPa at 1600°C) are still the flaw of MoSi 2 for the most sophisticated applications [2]. According to the previous studies, the mechanical properties of MoSi 2 could be increased by alloying processing or by introducing some reinforcement phase, such as Mo 5 Si 3 [3], ZrO 2 [4], ZrB 2 [5] and SiC [6]. In our previous work [7], it was confirmed that the addition of carbon nanotubes (CNTs) to the MoSi 2 matrix results in the improvement in both hardness and fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation Behaviors of CNTs/MoSi<sub>2</sub> Composites

Zhang

et al. 2014

AMM

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Molybdenum disilicide (MoSi2) matrix composites with various contents of carbon nanotubes (CNTs) were fabricated by sintering in vacuum at 1550°C for 1 h. The oxidation behaviors of CNTs/MoSi2composites at 1300°C for 200 h in air were studied. Results showed that MoSi2matrix composites with no more than 8 % CNTs in volume had good oxidation resistance at 1300 °C, although addition of CNTs reduced the high temperature oxidation resistance of MoSi2. An approximate linear relationship was found between the weight gain of CNTs/MoSi2composites and the content of CNTs. The oxidation resistance of CNTs/MoSi2composites at high temperature decreased with the increasing of CNTs contents. Since the gaseous products were formed during the oxidation process and escaped from the oxide film, the protective film became loose which offered channels for the oxygen soaking into the composites. Thus the oxidation resistance of CNTs/MoSi2composites was decreased.

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“…Amongst them, tungsten disilicide (WSi 2 ) can be a good candidate as a reinforcement material thanks to its abrasive, adhesive wear and oxidation resistances [14,15]. In this manner, composites including boride and silicide phases may offer improved mechanical properties, oxidation and corrosion resistance, particularly at high temperatures [16][17][18]. As one kind of boride and silicide composite, WB-WSi 2 composites are promising as advanced structural materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of tungsten disilicide addition on tungsten boride based composites produced by milling-assisted pressureless sintering

et al. 2018

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In this study, tungsten boride (WB and W 2 B) based composites with various amounts of tungsten disilicide (WSi 2) addition were fabricated by using a combined method of mechanical milling (MM), cold isostatic pressing (CIP) and pressureless sintering (PS). MM was conducted for 4 h in ethanol (wet milling) and Argon atmosphere (dry milling) using a high-energy ball mill. WSi 2 was used with different amounts (0, 5, 10 and 20 wt.%) in order to investigate its effect on the resultant products. MM'd powders were compacted using CIP under a pressure of 450 MPa, and were consecutively sintered at 1600 °C for 2 h and 1770 °C for 2 h under Ar atmosphere. Compositional, physical and microstructural characterizations of the samples were performed using stereo and optical microscopes, X-ray diffractometer, TOPAS software, scanning electron microscope coupled with an energy-dispersive spectrometer, particle size analyzer and gas pycnometer. Sintered products were also characterized in terms of Archimedes density and Vickers microhardness. Moreover, the oxidation studies of the samples were performed at 500 and 1000 °C via thermogravimetric analyzer. The results showed that the highest density, microhardness and oxidation stability values amongst the fabricated composites were obtained for the dry milled and sintered WB-20 wt.% WSi 2 sample.

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Mechanical properties and oxidation behavior of silicon carbide–molybdenum silicides composites

Cited by 8 publications

References 28 publications

High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

High Temperature Oxidation Resistance Performance of TiC/Mo Composite by Spark Plasma Sintering

High Temperature Oxidation Behaviors of CNTs/MoSi<sub>2</sub> Composites

Effect of tungsten disilicide addition on tungsten boride based composites produced by milling-assisted pressureless sintering

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