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The development of brazing technology for SiC/SiCf composites for the fusion reactor applications

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The development of brazing technology for SiC/SiCf composites for the fusion reactor applications. Collaboration: ENEA Frascati, Italy Max Planck Institute of Microstructure Physics, Halle, Germany. Preparation of eutectic alloys:

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slide1

The development of brazing technology for SiC/SiCf composites for the fusion reactor applications

Collaboration: ENEA Frascati, Italy

Max Planck Institute of Microstructure Physics, Halle, Germany

slide2

Preparation of eutectic alloys:

The Si-Ti and Si-Cr eutectic alloys were prepared in an Ar plasma furnace

The as obtained alloys were remelted several times in an high preasure e-beam to obtained a fine eutectic microstructure

Microstructure of eutectic alloys

Light regions represent the Si2Ti intermetalic cmpound while the dark regions represent pure Si

SEM micrograph of the Si-Ti eutectic alloy

slide3

3 µm

fibre

Si

SiC matrix

Si2Ti

Manufacture of the SiC/SiCf junctions

The junctions were heated at a rate of 10 0C/min at 20 0C above the eutectic

temperature, kept at this temperature for 5 min and than cooled down to

room temperature at a rate of 20 0C/min

SEM cross section of the junction

brazed with Si-Ti alloy

High magnification cross section

slide4

Si

SiC matrix

5 nm

Interface characterization

High resolution microscopy of the junction cross-section

Si

Si2Ti

SiC matrix

3 µm

  • The interface between SiC-Si is atomically smooth
  • No amorphous layer was observed
slide5

Si-L23 edge

SiC

50 nm

C-K edge

Ti-L23 edge

Si2Ti

b)

a)

103 eV

105 eV

Si2Ti

interface

SiC+Si2Ti

SiC

c)

Nanochemistry of the junctions

  • No interdiffusion was observed
slide6

Mechanical testing

Behaviour at shearing test

slide7

Conclusions

  • eutectic Si-16Ti and Si-18Cr alloys are suitable for joining SiC/SiCf composites
  • the joints investigated did not show any defects in the brazing layer
  • no interdiffusion or formation of additional phases was observed
  • both Si-16Ti and Si-18Cr joints led to the conclusion that direct chemical bonds
  • are responsible for the adhesion with the SiC/SiCf composites
  • the shear tests of the joints of SiCf/SiC composites exhibit remarkable values
  • of the bonding strength up to 140 MPa)
slide8

Publications

B.Riccardi, C.A.Nannetti, J.Woltersdorf, E.Pippel, T.Petrisor. “High temperature brazing for SiC and

SiCf/SiC Ceramic Matrix Composites”. Advanced SiC/SiC Ceramic Composites: development and

Applications in Energy Systems, A.Kohyama, M.Singh, H-T.Lin and Y.Katoh eds,

Ceramic Transactions Vol 144, The American Ceramic Society, Westerville (OH), 2002, pp 311-322.

B.Riccardi, C.A.Nannetti, J.Woltersdorf, E.Pippel, T.Petrisor.”Brazing of SiC and SiCf/SiC composites performed with 84Si-16Ti eutectic alloy:microstructure and strength”. Journal of Material Science 37 (2002) 5029-5039.

B.Riccardi, C.A.Nannetti ,T.Petrisor, J.Woltersdorf, E.Pippel S.Libera L.Pilloni, “Issues of Low Activation

Brazing of SiCf/SiC Composites by Using Alloys Without Free Silicon”

Journal of Nuclear Materials, 329-33, 562-566 Part A AUG 1, 2004.

B.Riccardi, C.A.Nannetti, J.Woltersdorf, E.Pippel, T.Petrisor, ”Joining of SiC based ceramics and composites with Si-16Ti and Si-18Cr eutectic alloys”. International Journal of Materials and Product Technology 20 (5-6): 440-451, 2004.

B. Riccardi, C. A. Nanneti. T. Petrisor, M. Sacheti, A. Orsini, Italian Patent AN: RM2001A000101 (2001).