Local thermal conductivity measurements to determine the fraction of α-cristobalite in thermally grown oxides for aerospace applications

被引：28

作者：

Olson, David H. ^{[1
]}

Gaskins, John T. ^{[1
]}

Tomko, John A. ^{[2
]}

Opila, Elizabeth J. ^{[2
]}

Golden, Robert A. ^{[3
]}

Harrington, Gregory J. K. ^{[3
]}

Chamberlain, Adam L. ^{[3
]}

Hopkins, Patrick E. ^{[1
,2
,4
]}

机构：

[1] Univ Virginia, Dept Mech & Aerosp Engn, Charlottesville, VA 22904 USA

[2] Univ Virginia, Dept Mat Sci & Engn, Charlottesville, VA 22904 USA

[3] Rolls Royce Corp, Indianapolis, IN 46225 USA

[4] Univ Virginia, Dept Phys, Charlottesville, VA 22904 USA

来源：

SCRIPTA MATERIALIA | 2020年 / 177卷

基金：

美国国家科学基金会;

关键词：

Thermal conductivity; Cristobalite; Thermally grown oxide; Environmental barrier coating; Time-domain thermoreflectance mapping; PROPERTY IMAGING TECHNIQUE; PICOSECOND ACOUSTICS; 2-OMEGA METHOD; HEAT-TRANSFER; TEMPERATURE; SIO2; DEPENDENCE; VIBRATIONS; OXIDATION;

D O I：

10.1016/j.scriptamat.2019.10.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Devitrification of the thermally grown oxide that forms in aerospace coatings used to protect ceramic matrix composites is a contributor to the mechanical failure of these coatings at high operating temperatures. Current methods used to identify the formation of a-cristobalite are time consuming and difficult, due to the limited differences in properties as well as the size scale over which these phase contrasts occur. This study employs time-domain thermoreflectance to spatially profile the thermal conductivity of thermally aged samples, providing a practical method to understand the spatial distribution of alpha-cristobalite in partially- and fully-devitrified amorphous silica. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：214 / 217

页数：4

共 43 条

[1] Diffusons, locons and propagons: character of atomic vibrations in amorphous Si [J].

Allen, PB ;

Feldman, JL ;

Fabian, J ;

Wooten, F .

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1999, 79 (11-12) :1715-1731

[2] Effect of cristobalite formation on the delamination resistance of an oxide/Si/(SiC/SiC) environmental barrier coating system after cyclic high temperature thermal exposure [J].

Arai, Yutaro ;

Aoki, Yuto ;

Kagawa, Yutaka .

SCRIPTA MATERIALIA, 2017, 139 :58-62

[3] RAMAN SPECTRA OF ALPHA-CRISTOBALITE AND BETA-CRISTOBALITE [J].

BATES, JB .

JOURNAL OF CHEMICAL PHYSICS, 1972, 57 (09) :4042-+

[4] Volume change attending low-to-high inversion of cristobalite [J].

Beals, MD ;

Zerfoss, S .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1944, 27 (10) :285-292

[5]

Birch F, 1940, AM J SCI, V238, P529

[6] Upper limit to the thermal penetration depth during modulated heating of multilayer thin films with pulsed and continuous wave lasers: A numerical study [J].

Braun, Jeffrey L. ;

Hopkins, Patrick E. .

JOURNAL OF APPLIED PHYSICS, 2017, 121 (17)

[7] Analysis of heat flow in layered structures for time-domain thermoreflectance [J].

Cahill, DG .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2004, 75 (12) :5119-5122

[8] THERMAL-CONDUCTIVITY MEASUREMENT FROM 30-K TO 750-K - THE 3-OMEGA METHOD [J].

CAHILL, DG .

REVIEW OF SCIENTIFIC INSTRUMENTS, 1990, 61 (02) :802-808

[9] Scanning thermal microscopy: A review [J].

Gomes, Severine ;

Assy, Ali ;

Chapuis, Pierre-Olivier .

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, 2015, 212 (03) :477-494

[10]

Heaney P., 1994, Silica: Physical Behavior, Geochemistry and Materials Applications

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