Influence of interface roughness on the strengthof thermal barrier coating (TBC) manufactured byair plasma spray (APS)
Başlık çevirisi mevcut değil.
- Tez No: 725086
- Danışmanlar: Belirtilmemiş.
- Tez Türü: Yüksek Lisans
- Konular: Mühendislik Bilimleri, Engineering Sciences
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: The University of Manchester
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 70
Özet
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Özet (Çeviri)
In energy generation or aircraft production industries, in which either gas-steam turbine engine or aircraft turbine engine is used, one of the major aim is to improve efficiency of in-service turbine engines. Higher working temperatures inside the engines are proven for rising yield. Super alloys are most preferable materials for the turbine blades; however their ultimate service temperatures are lower than expected elevated service conditions. Therefore, they are used with thermal barrier coatings, for instance air plasma sprayed thermal barrier coatings for gas turbine engine, to withstand these conditions. Yet, when thermal barrier coating's function is taken into consideration, their service life estimations become critical. For this purpose, mechanical properties and failure conditions of thermal barrier coatings has subjected in substantial work that has published but this dissertation project is first study to investigate effect of bond coat top coat local interface roughness on the strength of air plasma sprayed thermal barrier coating by using cantilever beam bending method. In this research project, influence of local interface roughness properties, which is altered by heat treatment, on the strength of air plasma sprayed thermal barrier coating, is aimed to research. With this objective, initially, APS – TBC samples are isothermally heat treated then their mechanical property alterations are compared with in each layer. Afterwards, breakdown strength of coatings is calculated and their relation with local undulations at top coat bond coat interface is investigated. Thermally grown oxide formation and development is found to be in trend with oxide layer growth law. However, there aren't big global roughness changes, with respect to isothermal heat treatment durations, reported. Yet, hardness and elastic modulus of top coat and bond coat is found to be influenced by isothermal heat treatments but unexpectedly due to inner oxide formations or sintering effect. Furthermore, no particular relations is found between failure location, critical strength and interface undulations of thermal barrier coating according to cantilever beam bending experiment outputs. However, it is found that, longer heat treatment time can increase breakdown strength of thermal barrier coating. To conclude, no linear correlation found between top coat - bond coat interface undulation level and critical failure strength for isothermally different duration heat treated samples. It is worth to mention that, beacuse of experimental and time constraints, in this dissertation project exact local roughness values is not calculated and inner oxides, which effects final mechanical properties, compostion and their amount is not determined. These can be objective for an future work in this field of study.
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