Alloy Design of Intermetallics for Protective Scale Formation and for Use as Precursors for Complex Ceramic Phase Surfaces
Journal Article
·
· Intermetallics
- ORNL
This paper highlights some evolving new design approaches to developing intermetallic alloys capable of protective scale formation and/or for their use as precursors for functional complex ceramic phase surface synthesis. The unique characteristics of intermetallics present challenges to achieving protective scale formation, but also offer the potential for leveraging novel phenomena not generally observed in conventional alloys. Examples will be drawn from the oxidation of aluminides (Fe{sub 3}Al, Nb{sub 2}Al, NbAl{sub 3}, Ti{sub 3}Al, TiAl), silicides (MoSi{sub 2}, Mo{sub 5}Si{sub 3}, Mo-Si-B, Ti{sub 5}Si{sub 3}), and Laves phases (Cr{sub 2}Nb, Cr{sub 2}Ta, Nb(Cr,Al){sub 2}, Ti(Cr,Al){sub 2}). Recent work also suggests that intermetallics can be used as precursors for the synthesis of functional complex ceramic phase surfaces by gas-metal reactions (oxidation, nitridation, carburization, etc.). The potential for using such reaction phenomena to synthesize layered or composite surfaces of ternary nitrides (carbides, borides, etc.) of technological interest such as Ti{sub 3}AlC{sub 2}, bimetallic nitride and carbide catalysts (e.g. Co{sub 3}Mo{sub 3}N or Co{sub 3}Mo{sub 3}C), and magnetic rare earth nitrides (Fe{sub 17}Sm{sub 2}N{sub x} or Fe{sub 17}Nd{sub 2}N{sub x}), from intermetallic precursors is discussed.
- Research Organization:
- Oak Ridge National Laboratory (ORNL); Shared Research Equipment Collaborative Research Center
- Sponsoring Organization:
- FE USDOE - Office of Fossil Energy (FE)
- DOE Contract Number:
- AC05-00OR22725
- OSTI ID:
- 1003130
- Journal Information:
- Intermetallics, Journal Name: Intermetallics Journal Issue: 7-9 Vol. 12; ISSN 0966-9795
- Country of Publication:
- United States
- Language:
- English
Similar Records
Synthesis of Ternary Nitrides From Intermetallic Precursors: Modes of Nitridation in Model Cr3Pt Alloys to Form Cr3PtN Perovskite and Applications to Other Systems
Ceramic materials from organometallics
Ternary alloying study of MoSi{sub 2}
Journal Article
·
Wed Dec 31 23:00:00 EST 2003
· Chemistry of Materials
·
OSTI ID:1003132
Ceramic materials from organometallics
Conference
·
Fri Sep 01 00:00:00 EDT 1995
·
OSTI ID:99132
Ternary alloying study of MoSi{sub 2}
Journal Article
·
Wed Dec 31 23:00:00 EST 1997
· Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science
·
OSTI ID:605815