Tailoring the interfacial microstructure and mechanical strength of SiC ceramic joints using joining temperature and interlayer thickness
- School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009 (China)
Highlights: • Bonding temperature could be decreased from 1600 °C to 1300 °C by inserting the Ti foil between SiC and Ta-5W. • The initial thickness interlayer and the number of interlayer had a significant influence on interface bonding. • Layered reaction layers consisting of carbides and silicide formed at the SiC/Ti/Ta-5W interfaces. • The joint strength depended mainly on the reaction layer thickness, especially the thickness of silicide layer. - Abstract: Silicon carbide ceramic joints solid state diffusion bonded by spark plasma sintering with Ti/Ta-5W/Ti multi-interlayer in the temperature range from 1250 °C to 1500 °C were investigated in detail in terms of interfacial microstructure, elemental diffusion, phase constituents, shear strength, and fracture morphology. Layered reaction layers consisting of carbides (TiC, Ti{sub 3}SiC{sub 2}, (Ta,Ti,W)C), silicide ((Ta,Ti,W){sub 5}Si{sub 3}) and Ta-rich solid solution (Ta,Ti,W) formed at the SiC/Ti/Ta-5W interfaces. It was found that joining temperature could be decreased from 1600 °C to 1300 °C by inserting the Ti foil between SiC and Ta-5W. Nevertheless, an attempt to further decrease the joining temperature to 1250 °C failed even using a thin Ti foil. The initial thickness interlayer and the number of interlayer had an influence on the interfacial diffusion bonding at SiC/Ti interface. Higher joining temperature was needed to achieve a tough interface joining for a thick interlayer compared with a thin interlayer. The increase of interlayer number also required higher joining temperature. The shear strength reached 123.5 ± 25.3 MPa for the joint diffusion bonded at 1300 °C.
- OSTI ID:
- 22805095
- Journal Information:
- Materials Characterization, Journal Name: Materials Characterization Vol. 142; ISSN 1044-5803; ISSN MACHEX
- Country of Publication:
- United States
- Language:
- English
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