Adhesion behavior of plasma sprayed thermal barrier coatings on Al-6061 and cast iron substrates

doi:10.1007/s11706-009-0051-y

Front Mater Sci Chin

2009, Vol. 3

Issue (3) : 333-338 https://doi.org/10.1007/s11706-009-0051-y

RESEARCH ARTICLE

Adhesion behavior of plasma sprayed thermal barrier coatings on Al-6061 and cast iron substrates

N. KRISHNAMURTHY¹(

), S. C. SHARMA², M. S. MURALI², P. G. MUKUNDA¹

1. Mechanical Engineering Department, Nitte Meenakshi Institute of Technology, Bangalore 560064, Karnataka, India; 2. Mechanical Engineering Department, RV College of Engineering, Bangalore, Karnataka, India

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Abstract

In this work an investigation was carried out on adhesion strength and micro-hardness of plasma sprayed coatings on Al-6061 and cast iron substrate materials. For the adhesion test, ASTM C633, and for the micro hardness, ASTM E384 standards were used. From the results obtained it was found that the main failure locations were in the bond coat-substrate interface, which is considered as adhesion strength. The various parameters affecting adhesion strength are also discussed.

Keywords adhesion strength micro-hardness plasma spraying thermal barrier coating

Corresponding Author(s): KRISHNAMURTHY N.,Email:krishamu@rediffmail.com

Issue Date: 05 September 2009

Cite this article:

N. KRISHNAMURTHY,S. C. SHARMA,M. S. MURALI, et al. Adhesion behavior of plasma sprayed thermal barrier coatings on Al-6061 and cast iron substrates[J]. Front Mater Sci Chin, 2009, 3(3): 333-338.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-009-0051-y
https://academic.hep.com.cn/foms/EN/Y2009/V3/I3/333

Fig.1 Types of failure in the tensile adhesion test ASTM-C-633

Tab.1 Chemical composition of substrate and coating materials

Fig.2 Dimensions of uncoated specimen

Tab.2 Coating thickness of different layers (μm)

Tab.3 Plasma spray parameters for different coating materials used

Fig.3 Schematic diagrams of coating layers with Al-6061 substrate

Fig.4 Coated specimens with Al-6061and CI substrate

Tab.4 Adhesion and hardness values for different coating systems

Fig.5 Fractured specimens with Al-6061 substrate: Samples 1; Sample 2; Sample 3; Sample 4; Sample 5; Sample 6

Fig.6 Fractured specimens with cast iron substrate: Samples 1; Sample 2; Sample 3; Sample 4; Sample 5; Sample 6

Fig.7 Diagram of strength versus strain for Samples 1, 2, 3 and Samples 4, 5, 6 with Al-6061 substrate

Fig.8 Diagram of strength versus strain for Samples 1, 2, 3 and Samples 4, 5, 6 with cast iron substrate

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[1]	Dong-Bo ZHANG,Bin-Yi WANG,Jian CAO,Guan-Yu SONG,Juan-Bo LIU. Investigation on the thermo-chemical reaction mechanism between yttria-stabilized zirconia (YSZ) and calcium--magnesium--alumino-silicate (CMAS)[J]. Front. Mater. Sci., 2015, 9(1): 93-100.

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