T. Laha, Indian Institute of Technology, Kharagpur, Kharagpur, India; K. Balani, A. Agarwal, Florida International University, Miami, FL; J. Karthikeyan, ASB Industries, Inc, Barberton, OH; A. Kay, ASB Industries, Barberton, OH
Two different coatings of 1100 Aluminum were deposited onto similar substrate, using 100 vol.% He and mixture of He–20 vol.% N2 as carrier gases. TEM investigation revealed a shock wave structure with restrained flow lines and dislocation pinning in 100% He processed coating, which attributed to the higher hardness of this coating. Three-point bending test was carried out on both the cold-sprayed coatings to study the interfacial strength. 100% He processed coating showed higher delamination strength. This is attributed to the higher degree of compactness of the 100% He processed coating due to higher ratio of specific heat and lower mass density of helium gas. Microstructural analysis revealed the phenomena of crack propagation through the coating and delamination at the interface. Mechanical properties have been correlated to corrosion behavior of two coatings in H2SO4 environment.
Summary: This article is about interfacial strength of cold sprayed 1100 aluminum coatings.
