A method for testing the interface toughness of ceramic environmental barrier coatings (EBCs) on ceramic matrix composites (CMCs)

被引：27

作者：

Kakisawa, Hideki ^{[1
]}

Nishimura, Toshiyuki ^{[1
]}

机构：

[1] Natl Inst Mat Sci, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2018年 / 38卷 / 02期

基金：

日本科学技术振兴机构;

关键词：

Interface fracture test; Interface toughness; Coating adhesion; Environmental barrier coating; MODE DELAMINATION TOUGHNESS; DOUBLE CANTILEVER BEAM; BIMATERIAL INTERFACES; MECHANICAL-PROPERTIES; FRACTURE-RESISTANCE; THERMAL-EXPANSION; SPRAYED COATINGS; INDENTATION TEST; CRACK; KINKING;

D O I：

10.1016/j.jeurceramsoc.2017.09.032

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A simple interface fracture test for ceramic environmental barrier coatings (EBCs) on ceramic matrix composites (CMCs) was developed. A variation on the asymmetric double cantilever beam (ADCB) test was proposed so that the interface toughness could be measured in a small specimen of simple shape without applying interlaminar loading to the CMC substrate. The proposed test was applied to an EBC consisting of a mullite layer and Si bond coat on a monolithic SiC substrate. A pre-crack was introduced by pop-in cracking, and then a notch overlapping the pre-crack was machined. The pre-crack was opened by inserting a wedge into the notch. From the critical notch opening displacement the crack starts to propagate, interface toughness is calculated. The measured interface toughness was 4.1 J/m2. Finally, the application range of the test was discussed and suggestions were made for introduction of the notch and pre-crack.

引用

页码：655 / 663

页数：9

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