Processing and Characterization of Diffusion‐Bonded Silicon Carbide Joints using Molybdenum and Titanium Interlayers

Koyanagi, Takaaki; Kiggans, James O.; Shih, Chunghao; Katoh, Yutai

doi:10.1002/9781119040323.ch14

Cited by 4 publications

(3 citation statements)

References 20 publications

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“…The phases in the Mo diffusion bond has been identified in previous study using x-ray diffraction [22]: a layer of ternary phase (Mo<5Si3C<1) adjacent to the SiC interface and a middle layer of molybdenum carbide (Mo2C) as shown in Fig. 5.…”

Section: Microstructural Investigations Of Corroded Joint (1) Mo Diffmentioning

confidence: 95%

M3FT-16OR020202112 - Report on viability of hydrothermal corrosion resistant SiC/SiC Joint development

Katoh¹,

Koyanagi²,

Kiggans³

et al. 2016

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Hydrothermal corrosion of four types of the silicon carbide (SiC) to SiC plate joints were investigated under PWR and BWR relevant chemical conditions without irradiation. The joints were formed by metal diffusion bonding using molybdenum or titanium interlayer, reaction sintering using Ti-Si-C system, and SiC nanopowder sintering. Most of the formed joints withstood the corrosion tests for five weeks. The recession of the SiC substrates was limited. Based on the recession rate of the bonding layers, it was concluded that all the joints except for the molybdenum diffusion bond are promising under the reducing activity environments. The SiC nanopowder sintered joint was the most corrosion tolerant under the oxidizing activity environment among the four joints.

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Section: Microstructural Investigations Of Corroded Joint (1) Mo Diffmentioning

confidence: 95%

M3FT-16OR020202112 - Report on viability of hydrothermal corrosion resistant SiC/SiC Joint development

Katoh¹,

Koyanagi²,

Kiggans³

et al. 2016

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“…The phases in the Mo diffusion bond has been identified in previous study using x-ray diffraction [25]:…”

Section: Microstructural Investigations Of Corroded Jointmentioning

confidence: 99%

Hydrothermal corrosion of silicon carbide joints without radiation

Koyanagi

Katoh

Terrani

et al. 2016

Journal of Nuclear Materials

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Hydrothermal corrosion of four types of the silicon carbide (SiC) to SiC plate joints were investigated under pressurized water reactor and boiling water reactor relevant chemical conditions without irradiation.The joints were formed by metal diffusion bonding using molybdenum or titanium interlayer, reaction sintering using Ti-Si-C system, and SiC nanopowder sintering. Most of the joints withstood the corrosion tests for five weeks. The recession of the SiC substrates was limited. Based on the recession of the bonding layers, it was concluded that all the joints except for the molybdenum diffusion bond are promising under the reducing environments without radiation. The SiC nanopowder sintered joint was the most corrosion tolerant under the oxidizing environment among the four joints.

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“…Many joining approaches and various interlayers have been utilized. Sintered, hot-pressed, and CVD (chemical vapor deposition) SiC ceramics have been diffusion-bonded using metal interlayers of molybdenum, 10 titanium, [11][12][13][14][15][16] tantalum, 17 tungsten, 18 niobium, 17 zirconium, 16 nickel, 19 Inconel 600, 20 and intermetallics, such as TiAl. Plates, disks, pipes, pipe-disk couples, and other part geometries have been diffusionbonded.…”

Section: Introductionmentioning

confidence: 99%

Diffusion bonding of SiC ceramics with interlayers of metallic titanium foils and PVD titanium coatings

Halbig

Singh

Tsuda

et al. 2022

Int J Applied Ceramic Tech

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Silicon carbide (SiC) is a candidate material for high‐temperature structural aerospace applications due to its thermal and mechanical properties. Joining technologies enable the fabrication of complex shaped components needed for such applications. Various interlayers and processing conditions were used to form diffusion bonds between SiC substrates. Interlayers of titanium (Ti) foils and physically vapor deposited Ti coatings were used in the thicknesses of 10 and 20 μm with processing hold times of 1, 2, and 4 h. Polished cross sections of resulting diffusion bonds were analyzed using scanning electron microscopy (SEM) coupled with energy‐dispersive spectroscopy (EDS) and using transmission electron microscopy (TEM). From the TEM analysis, selected‐area diffraction patterns for Ti3SiC2, Ti5Si3Cx, and TiSi2 were observed. Moreover, TiC and an unknown phase were present in diffusion bonds formed with metallic titanium foil. From the SEM/EDS analyses, intermediate phases of Ti5Si3Cx and TiC were found to be present in microcracked diffusion bonds. With the thinner Ti interlayers and/or longer processing time, microcracking was alleviated or eliminated due to the presence of the more stable and lower thermal expansive phases of Ti3SiC2 and TiSi2. Detailed analysis of microstructures and the probable phases that formed in the bonded regions is presented.

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Processing and Characterization of Diffusion‐Bonded Silicon Carbide Joints using Molybdenum and Titanium Interlayers

Cited by 4 publications

References 20 publications

M3FT-16OR020202112 - Report on viability of hydrothermal corrosion resistant SiC/SiC Joint development

M3FT-16OR020202112 - Report on viability of hydrothermal corrosion resistant SiC/SiC Joint development

Hydrothermal corrosion of silicon carbide joints without radiation

Diffusion bonding of SiC ceramics with interlayers of metallic titanium foils and PVD titanium coatings

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