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Failure mechanisms of thermal barrie...

Xu, Tao.

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Failure mechanisms of thermal barrier systems.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Failure mechanisms of thermal barrier systems./
Author:	Xu, Tao.
Description:	224 p.
Notes:	Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 6020.
Contained By:	Dissertation Abstracts International65-11B.
Subject:	Engineering, Mechanical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3154531
ISBN:	9780496150748

Failure mechanisms of thermal barrier systems.
Xu, Tao.

Failure mechanisms of thermal barrier systems. - 224 p.

Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 6020.

Thesis (Ph.D.)--Princeton University, 2005.

Thermal barrier coatings (TBCs) are widely used in turbines for propulsion and power generation. The benefit results from their ability to sustain high thermal gradients in the presence of adequate backside cooling. Lowering the temperature of the metal substrate prolongs the life of the component: whether from environmental attack, creep rupture, or fatigue.

ISBN: 9780496150748Subjects--Topical Terms:

783786
Engineering, Mechanical.

Failure mechanisms of thermal barrier systems.
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020 $a 9780496150748
035 $a (UnM)AAI3154531
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100 1 $a Xu, Tao. $3 1059048
245 1 0 $a Failure mechanisms of thermal barrier systems.
300 $a 224 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-11, Section: B, page: 6020.
500 $a Adviser: Anthony G. Evans.
502 $a Thesis (Ph.D.)--Princeton University, 2005.
520 $a Thermal barrier coatings (TBCs) are widely used in turbines for propulsion and power generation. The benefit results from their ability to sustain high thermal gradients in the presence of adequate backside cooling. Lowering the temperature of the metal substrate prolongs the life of the component: whether from environmental attack, creep rupture, or fatigue.
520 $a Thermal barrier systems exhibit multiple failure mechanisms, depends on the deposition methods of the TBCs, chemical composition of the bond coats, and their working environments. Some of the most prevalent are studied in this thesis.
520 $a There are two types of thermal barrier systems based on the chemical composition of the bond coats: Pt-aluminide and NiCoCrAlY bond coats. Ratcheting happens the most in the systems with Pt-aluminide bond coats; while edge delamination is considered a possible failure mechanism for the systems with NiCoCrAlY bond coats.
520 $a Ratcheting is motivated by displacement instability in the thermally grown oxide (TGO). Interactions between cracks induced in TBCs upon thermal cycling have been calculated. Cracks that converge from neighboring imperfections exhibit a minimum energy release rate prior to coalescence. Equating this minimum to the toughness of the TBC provides a criterion for coalescence and failure. Imposing this criterion allows the change in crack length upon cycling and the number of cycles to failure to be ascertained. This simulation capability is used to explore various influences on durability.
520 $a Samples with NiCoCrAlY bond coat are studied after subjected to thermal cycling in a burner rig. In each case, a dominant delamination has been identified, that extends primarily along the interface between the TGO and the bond coat. Calculations of the delamination energy release rate, upon comparison with the interface toughness, reveals a critical TGO thickness, (h tgo)c ≈ 3mum, comparable to that found experimentally.
590 $a School code: 0181.
650 4 $a Engineering, Mechanical. $3 783786
650 4 $a Engineering, Materials Science. $3 1017759
690 $a 0548
690 $a 0794
710 2 0 $a Princeton University. $3 645579
773 0 $t Dissertation Abstracts International $g 65-11B.
790 1 0 $a Evans, Anthony G., $e advisor
790 $a 0181
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3154531