Interesting aspects of indentation and scratch methods for characterization of thermally-sprayed coatings

被引：52
作者：
Nohava, Jiri [1 ]
Bonferroni, Benedetta [2 ]
Bolelli, Giovanni [2 ]
Lusvarghi, Luca [2 ]
机构：
[1] CSM Instruments SA, CH-2034 Peseux, Switzerland
[2] Univ Modena & Reggio Emilia, Dipartimento Ingn Mat & Ambiente, I-41100 Modena, Italy
来源：
SURFACE & COATINGS TECHNOLOGY | 2010年 / 205卷 / 04期
关键词：
NANOINDENTATION METHOD; MECHANICAL-PROPERTIES; ALLOY COATINGS; HVOF; PLASMA; MICROSTRUCTURE; COHESION;
D O I：
10.1016/j.surfcoat.2010.08.086
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In order to improve the knowledge on the use and significance of instrumented indentation and scratch testing on thermally-sprayed materials, a wide range of tests was performed on thermally-sprayed ceramic, cermet and metal coatings. A scale-dependent behavior of hardness was observed as a function of indentation depth for all coatings: at low penetration depths, the hardness value depends on the intralamellar material properties, whereas at larger depths it reflects the long-range cohesive strength of the coating. In all cases, hardness becomes independent of the indentation depth above a threshold value of -2000 nm. The elastic modulus is also scale-dependent, but it never stabilizes to a depth-independent value, probably on account of crack opening/closing mechanisms. Scratch test on the cross-section has been deeply investigated and identified as a comparative method to quantify the cohesion of the coatings. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：1127 / 1131
页数：5
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