Compliant interlayer for advanced ceramic/metal engine components
This article describes a compliant interlayer for advanced ceramics that extends thermal-barrier system capability for gas-turbine and other high-temperature engine components. Ceramics withstand extremely high temperatures that would destroy most other engineering materials. But ceramics may fail catastrophically, so they must be processed and applied carefully to avoid flaws and operating loads that stress them beyond their point of failure. Expansivity differences between ceramic and metal impose substantial stress at the ceramic/metal bond of ceramic thermal barriers during thermal cycling, which leads to ceramic fracture and failure. A fiber-metal compliant interlayer, between the ceramic and the metal, reduces thermal cycling stresses. The compliant material helps relatively thick ceramic coatings of 1.5--3.2 mm remain intact through severe multiple-cycle thermal excursions. Typical applications include high-temperature gas-turbine engine seals and combustors, and internal-combustion engine components and insulators.
- OSTI ID:
- 6460265
- Journal Information:
- Automotive Engineering; (United States), Journal Name: Automotive Engineering; (United States) Vol. 103:1; ISSN 0098-2571; ISSN AUEGBB
- Country of Publication:
- United States
- Language:
- English
Similar Records
High temperature ceramic metal attachment using a strain absorbing fiber metal pad
Functionally gradient materials for thermal barrier coatings in advanced gas turbine systems