Interfacial reaction and stability of SCS-6 SiC/Ti–25Al–10NB–3V–1MO composites

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 1998-05, Vol.246 (1), p.213-220
• Main Authors: Yang, Y.Q., Dudek, H.J., Kumpfert, J.
• Format: Article
• Language: English
• Subjects: Applied sciences; Exact sciences and technology; Fibre reinforced metals; Interface; Metals. Metallurgy; Powder metallurgy. Composite materials; Production techniques; Reaction; Stability; Titanium matrix composites
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/S0921-5093(97)00749-1

Interfacial reactions in SCS-6 SiC/Ti–25Al–10Nb–3V–1Mo composites processed by fibre coating with matrix and followed by hot isostatic pressing were investigated with the method of analytical transmission electron microscopy. In as-processed composites, the reaction products are mainly (Ti,Nb)C and (Ti,Nb) 5(Si,Al) 3 with small amounts of (Ti,Nb) 3(Si,Al) and (Ti,Nb) 3(Al,Si)C distributed in three layers. In heat treated specimens additional layers of the reaction products were observed. After heat treatment at 700°C for 1000 h, the thickness of the reaction zone increases due to the formation and growth of the phases (Ti,Nb) 3(Si,Al) and (Ti,Nb) 3(Al,Si)C. A heat treatment at 800°C for 2000 h results in a thickening of all the reaction products. The formation and growth of phases in the interface is discussed with respect to the thermal stability of composite properties.