Effect of siliconizing temperature on microstructure and phase constitution of Mo–MoSi2 functionally graded materials

Zhang, Yingyi; Ni, Wenjie; Li, Yungang

doi:10.1016/j.ceramint.2018.03.136

Cited by 60 publications

(28 citation statements)

References 27 publications

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“…The RM‐Wrap SiC‐SiC joint microstructures are shown in Figure (Mo‐Wrap), Figure (Nb‐Wrap), and Figure (Ta‐Wrap): the round‐shaped disilicides particles are uniformly embedded in the Si‐rich matrix, which shows an excellent wettability on Mo at temperature above its melting point and can easily infiltrate and hinder the formation of pores between MoSi 2 particles. Likewise, all the joining material/SiC interfaces are continuous, and no cracks are visible within the joint area, thus indicating that the CTE mismatch between RM silicides/Si and SiC did not affect the integrity of the joint.…”

Section: Resultsmentioning

confidence: 99%

Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process

Gianchandani

Casalegno

Ambrois

et al. 2020

Int J Applied Ceramic Tech

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The aim of this work was to discuss the suitability of the joining process called “RM‐Wrap” (RM = Refractory Metals, ie, Mo, Nb, Ta, Zr) as a pressure‐less and tailorable technique to join several different ceramics such as SiC, alumina, and mullite (3Al2O3.2SiO2). In the RM‐Wrap joining technique the refractory metal foil is used as a wrap containing one or more silicon foils. It is performed at 1450°C, under flowing argon, and the resulting joining materials are in situ formed composites made of refractory metal disilicides (MoSi2, NbSi2, TaSi2, or ZrSi2) embedded in a silicon‐rich matrix; their coefficient of thermal expansion has been calculated and the Laser Flash Method was used to measure the thermal diffusivity of one of them (MoSi2/Si) in 25°C‐1000°C range, then to calculate its thermal conductivity. All the obtained joints are uniform, continuous, and crack free. Some preliminary oxidation tests were carried out on all joints at 1100°C, 6 hours in air, giving unchanged morphology of the interface and the joining materials itself; the joint strength of RM‐Wrap joined SiC was measured at room temperature using three different mechanical tests: (a) single lap (SL), (b) single lap off‐set (SLO) and (c) torsion on hourglass‐shaped samples (THG) (on Mo‐wrap joined SiC).

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Section: Resultsmentioning

confidence: 99%

Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process

Gianchandani

Casalegno

Ambrois

et al. 2020

Int J Applied Ceramic Tech

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show abstract

“…The reversed arrangement in which beam is fixed at section of 10% filler loading shows higher value of deflection as expected due to the lower stiffness of the 10% filler loading section. In both cases, it can be visualized from Figure 8 that when there are four sections with different filler loadings the relationship between the deflection and the distance from the fixed edge is described by the complex third-degree polynomial function in equation (4). actual experiment, whereas the finite element model assumes a linear model.…”

Section: Deflection Of Cantilever Beam: 40-30 and 30-40 Fgnf Compositesmentioning

confidence: 99%

“…Due to this unique advantage, FGM has been extensively researched in the past. [1][2][3][4] However, majority of the research are limited to metallic materials and ceramicmetal composites.…”

Section: Introductionmentioning

confidence: 99%

Functionally graded wood filler–recycled polypropylene composite: Effect of mechanical loading on deflection of cantilever beam

Bahri

Ratnam

Khalil

2020

Advanced Composites Letters

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Structures made from natural fiber–polypropylene composite material usually have uniform mechanical properties throughout. In some applications, such as in products with snap-fit assembly, it is desirable to have lower stiffness in some parts of the structure while having significantly higher stiffness at other parts of the same structure. In this research, the effect of changing the material arrangement and composition in a cantilever beam made from functionally graded natural filler–recycled polypropylene (FGNF-RPP) composite on the deflection behavior was investigated under static mechanical loads. The composite material was made using 10%, 20%, 30%, and 40% waste wood sawdust as a filler and arranged in different sequences to fabricate beams having 30–40, 20–30–40, and 10–20–30–40 hybrid sections along the length. The deflection behavior was investigated by both experiment and finite element modeling. The results showed that the 30–40 setup produced the least deflection when the 40% end of the beam was fixed, while the 10–20–30–40 setup produced the highest stiffness when fixed at the 40% section. The study has shown that the FGNF-RPP structure can be custom-designed to obtain different stiffness along the same structure, thus making it possible to design products with varying stiffness.

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“…The 300-mesh commercial pure Ti powder and NH4HCO3 (granularity=100-300 µm) as the pore-forming agent were mixed at the mass fraction ratio of 1:1, uniformly stirred, and placed (Zhang et al, 2018;Masri and Samsudin, 2018) into a mold, which was pressed by a miniature hydraulic press at the pressure of 80 MPa. The molded specimens were preserved in an ordinary muffle furnace at 100ºC for 5 h in order to completely remove the pore-forming agent, then heated to 1300ºC in a vacuum sintering furnace (< 10 -3 MPa), heat-preserved for 2 h and naturally cooled, forming the porous Ti substrate.…”

Section: Preparation Of Porous Timentioning

confidence: 99%

Effects of Process Parameters on Microarc Oxidation Film Layers of Porous Titanium

Fan¹

2019

Appl. Ecol. Env. Res.

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In order to better understand the specific effect of process parameters on porous titanium micro-arc oxidation coating. In this paper, TiO2 membrane layer was prepared on porous titanium matrix with 67 % porosity by microarc oxidation method (MAO), which use a phosphoric acid solution as electrolyte. The samples were characterized using XRD and SEM. The results showed that the samples prepared under the experimental parameters of 350 V and 30 min had a good surface morphology and could provide a higher specific surface area. After soaking in SBF for 7 days, the formation of hydroxyapatite (HA) can be induced, indicating that porous titanium after micro-arc oxidation modification has good biological activity.

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Effect of siliconizing temperature on microstructure and phase constitution of Mo–MoSi2 functionally graded materials

Cited by 60 publications

References 27 publications

Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process

Joining of SiC, alumina, and mullite by the Refractory Metal—Wrap pressure‐less process

Functionally graded wood filler–recycled polypropylene composite: Effect of mechanical loading on deflection of cantilever beam

Effects of Process Parameters on Microarc Oxidation Film Layers of Porous Titanium

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