Premium
Compositionally Graded Aluminum Oxide Coatings on Stainless Steel Using Laser Processing
Author(s) -
Bandyopadhyay Partha P.,
Balla Vamsi Krishna,
Bose Susmita,
Bandyopadhyay Amit
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2007.01651.x
Subject(s) - materials science , coating , aluminium , substrate (aquarium) , deposition (geology) , laser , composite material , oxide , metallurgy , optics , paleontology , oceanography , physics , sediment , biology , geology
A 1.5 mm thick fully dense alumina coating with a composition gradient from 100% Ni–20 wt% Cr at the substrate to 100% alumina on top has been developed on a 316 stainless steel sheet using Laser Engineered Net Shaping (LENS ™ ). The gradient coatings showed hardness in the range of 1800–2000 Hv, one of the highest reported so far due to high‐density layers. During laser deposition, α‐Al 2 O 3 found to grow along the deposition direction with coarse columnar structure. The inherent advantage of this approach is to control simultaneously both location and composition leading to better interfacial properties of coatings.