Plasma sprayed nano refractory coatings

Title

Plasma sprayed nano refractory coatings

Creator

Gowtham Sanjai S.; Pinto R.; Ramaswamy P.

Description

Nano powders may be reconstituted into micron sized plasma sprayable powders either by using a spray drier or a manual process by employing organic binders to agglomerate them. This paper deals with the synthesis of nano sized alumino-silicate plasma sprayable powders and plasma sprayed coatings prepared from them. Nano sized raw materials involving kyanite and andalusite refractory powders were converted into plasma sprayable powders by using polyvinyl alcohol (PVA) binders. The preparation methodology involved obtaining free flowing, micron sized agglomerated nano-alumino-silicates particles which could be plasma spray coated by using an Atmospheric Spray Coating Facility. About 220 microns thick nano-alumino silicate coatings were deposited on 75 microns thick commercial NiCrAlY bond coat on stainless steel substrates. The challenges involved in plasma spray coating the nano material with low density was in obtaining good deposition efficiency, retaining the nano micro structures and the structural phase composition of the coating. The coatings were evaluated for materials characteristics such as crystal structural phase via XRD, microstructure via SEM and chemical composition via EDS. The microstructure depicted fine grained nano-sized surface morphologies, kyanite and andalusite phase structure, with high potential for application as refractory coatings. Published under licence by IOP Publishing Ltd.

Source

IOP Conference Series: Materials Science and Engineering, Vol-577, No. 1

Date

2019-01-01

Publisher

IOP Publishing Ltd

Subject

kyanite; Nanostructured coatings; Plasma sprayable powder

Coverage

Gowtham Sanjai S., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST, Deemed to Be University, Bangalore, India; Pinto R., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST, Deemed to Be University, Bangalore, India; Ramaswamy P., Department of Mechanical and Automobile Engineering, Faculty of Engineering, CHRIST, Deemed to Be University, Bangalore, India

Rights

All Open Access; Gold Open Access

Relation

ISSN: 17578981

Format

Online

Language

English

Type

Conference paper

Identifier

https://doi.org/10.1088/1757-899X/577/1/012100

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85077895736&doi=10.1088%2f1757-899X%2f577%2f1%2f012100&partnerID=40&md5=d7a446528f2acd52468ea01a86081031