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  • B2-RuAl Intermetallic Compound
  • B2-RuAl Intermetallic Compound
  • B2-RuAl Intermetallic Compound
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B2-RuAl Intermetallic Compound
- Thin-Film Synthesis, Mechanical Properties and Cyclic Oxidation Behaviour

K. Woll, F. Mücklich

The exceptional high temperature strength as well as the high creep and oxidation resistance of B2 type intermetallic aluminides makes this group of intermetallics interesting for high temperature applications. Possible applications are oxidation protection scales in thermal barrier systems or protective coatings which avoid material interactions at high temperatures, e.g. in glass moulding processes. However, a limiting factor is the brittleness of intermetallic aluminides at room temperature (RT) as they show a brittle-ductile temperature TBD, above 773 K. A comparative study of many intermetallics with melting points above 1973 K reveals four binary systems that demonstrate exceptional room temperature ductility. One example is RuAl. Due to its extraordinarily high melting point of 2333 K, an excellent thermodynamic stability is guaranteed up to high temperatures. Good high temperature strength is known and high creep resistance can be expected. Regarding the application, thin intermetallic films are needed. Hence, our latest results concerning the synthesis of RuAl thin films are presented and reaction mechanisms are fundamentally discussed. Also, microstructural characterization is performed. Regarding the application, mechanical as well as oxidative characteristics are important. Therefore, these properties of RuAl are discussed and its potential in the mentioned applications is estimated.

B2-RuAl Intermetallic Compound B2-RuAl Intermetallic Compound
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