Detonation Sprayed Coatings for Aerospace Applications
This chapter presents a concise overview of detonation spray technology and the associated principles and applications for the aerospace industry. The most popular feedstock powders for obtaining a wide variety of coatings with varying composition and pro
- PDF / 871,642 Bytes
- 18 Pages / 439.37 x 666.142 pts Page_size
- 85 Downloads / 264 Views
Detonation Sprayed Coatings for Aerospace Applications D. Srinivasa Rao, L. Rama Krishna and G. Sundararajan
Abstract This chapter presents a concise overview of detonation spray technology and the associated principles and applications for the aerospace industry. The most popular feedstock powders for obtaining a wide variety of coatings with varying composition and properties are emphasized. The strategies for obtaining improved structure–property combinations via spray process optimization are discussed, and also the utilization of novel powders for enhanced protection. The typical microstructural features as a key to achieving the required mechanical, tribological and corrosion properties are briefly illustrated with specific examples. Keywords Detonation sprayed coatings barriers
22.1
Processing Wear resistance Thermal
Introduction
In the modern world many materials are expected to deliver multi-functional properties and performances. The available choice window often becomes narrow and therefore encourages non-conventional materials processing routes. An important example is the development of thermal spray coatings. This technology has expanded especially over the last few decades in such a way as to significantly broaden the otherwise narrow material selection window. In fact, thermal spray technologies have become essential for enhancing the service life of various engineering components, and have therefore become an integral part of the manufacturing process. For example, almost all aircraft landing gear manufacturers have one or more thermal spray systems as part of the regular manufacturing line.
D.S. Rao (&) L. Rama Krishna G. Sundararajan International Advanced Research Centre for Powder Metallurgy and New Materials (ARCI), Balapur PO, Hyderabad 500005, India e-mail: [email protected] © Springer Science+Business Media Singapore 2017 N. Eswara Prasad and R.J.H. Wanhill (eds.), Aerospace Materials and Material Technologies, Indian Institute of Metals Series, DOI 10.1007/978-981-10-2134-3_22
483
484
D.S. Rao et al.
In view of the large number of thermal spray technologies employed for various industrial applications, including aerospace, this chapter focusses mainly on one of the most important thermal spray technologies known as detonation spraying. The detonation spray coating (DSC) technology (also known with popular trade names such as D-Gun, Super D-Gun) primarily depends upon the kinetic energy of particles-in-flight, rather than the thermal energy transferred to the particles (e.g. unlike plasma spraying). In view of the lower thermal energy input the feedstock undergoes skin melting or plasticizing. Therefore the oxidation tendency and solidification stresses (tensile) are minimal. The detonation causes the particles to bombard the substrate with high kinetic energy, leading to formation of a coating with uniformly dense microstructure (porosity < 0.5 %) and excellent inter-splat bonding and adhesion to the substrate. In the aerospace industry detonation sprayed coatings are use
Data Loading...
